United States
Environmental Protection
Agency
Office of Research and
Development
Washington DC 20460
EPA/625/R-99/003
June 2001
vvEPA
US EPft Office c! Sesuarch and
Guide to Industrial
Assessments for Pollution
Prevention and Energy
Efficiency
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EPA/625/R-99/003
June 2001
Guide to Industrial Assessments
for
Pollution Prevention and Energy Efficiency
U. S. Environmental Protection Agency
Office of Research and Development
National Risk Management Research Laboratory
Center for Environmental Research Information
Cincinnati, Ohio
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NOTICE
The U.S. Environmental Protection Agency through its Office of Research and Development funded
and managed the research described here under Contract #68-07-0011, Work Assignment 21, to Science
Applications International Corporation. It has been subjected to the Agency's peer and administrative review
and has been approved for publication as an EPA document. Mention of trade names or commercial products
does not constitute endorsement or recommendation for use.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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FOREWORD
The U.S. Environmental Protection Agency is charged by Congress with protecting the Nation's land,
air, and water resources. Under a mandate of national environmental laws, the Agency strives to formulate and
implement actions leading to a compatible balance between human activities and the ability of natural systems
to support and nurture life. To meet this mandate, EPA's research program is providing data and technical
support for solving environmental problems today and building a science knowledge base necessary to manage
our ecological resources wisely, understand how pollutants affect our health, and prevent or reduce
environmental risks in the future.
The National Risk Management Research Laboratory (NRMRL) is the Agency's center for
investigation of technological and management approaches for preventing and reducing risks from pollution
that threaten human health and the environment. The focus of the Laboratory's research program is on methods
and their cost-effectiveness for prevention and control of pollution to air, land, water, and subsurface resources;
protection of water quality in public water systems; remediation of contaminated sites, sediments and ground
water; prevention and control of indoor air pollution; and restoration of ecosystems. NRMRL collaborates with
both public and private sector partners to foster technologies that reduce the cost of compliance and to
anticipate emerging problems. NRMRL's research provides solutions to environmental problems by:
developing and promoting technologies that protect and improve the environment; advancing scientific and
engineering information to support regulatory and policy decisions; and providing the technical support and
information transfer to ensure implementation of environmental regulations and strategies at the national, state,
and community levels.
This publication has been produced as part of the Laboratory's strategic long-term research plan. It is
published and made available by EPA's Office of Research and Development to assist the user community and
to link researchers with their clients.
E. Timothy Oppelt, Director
National Risk Management Research Laboratory
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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ACKNOWLEDGMENTS
This Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency was
prepared under the direction and coordination of Emma Lou George of the U.S. EPA's Office of Research and
Development, National Risk Management Research Laboratory in Cincinnati, Ohio.
Science Applications International Corporation, (SAIC), of Hampton and Reston, Virginia, revised the
original document, Modern Industrial Assessments: A Training Manual, Version I.Ob, December, 1995,
prepared by The Office of Industrial Productivity and Energy Assessment, at Rutgers, The State University of
New Jersey. The training manual preparation was sponsored by an interagency agreement between the
Department of Energy's Office of Industrial Technology and he United States Environmental Protection
Agency's Office of Research and Development, Pollution Prevention Research Branch. Kelly L. Binkley was
the primary SAIC contributor to its revision and reproduction. Brian Westfall of the U.S. EPA National Risk
Management Research Laboratory's Sustainable Technology Division and Cam Metcalf of the Kentucky
Pollution Prevention Center provided assistance in the development of this guide.
IV
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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ABSTRACT
This document presents an overview of industrial assessments and the general framework for
conducting an assessment. It describes combined assessments for pollution prevention and energy, "industrial
assessments", providing guidance to those performing assessments at industrial or other commercial facilities.
In addition, basic information about waste generating industrial operations and energy consuming equipment is
provided. This guide can be used by both facility personnel to conduct in-house assessments of operations and
by third parties who are interested in providing industrial assessments.
Traditionally, assessments have been performed on singular problem areas, focusing on either
pollution prevention or energy. An interagency agreement between the USEPA and the Department of Energy
combined pollution prevention and energy assessments into industrial assessments, looking at both areas for
small and medium size facilities in SIC codes 20-39. A first draft of a training manual describing this industrial
assessment methodology was prepared by Rutgers, The State University of New Jersey, in December of 1995.
This Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency is organized
into four basic sections:
Basic Concepts, Chapters 1 - 4. Assessment methodology, fundamentals of an assessment, and
evaluation of pollution prevention and energy conservation
opportunities.
Specific Waste Generation Industrial operations, waste generated from each operation, and
Information, Chapter 5. pollution prevention opportunities.
Specific Energy Consumption, Types of energy consuming equipment including electrical
Information, Chapters 6-10. equipment, heat generating equipment like boilers, and furnaces,
prime movers of energy, thermal applications, andHVAC.
References and Case Studies, Materials to be used repeatedly such as references, sources of
information, and pollution prevention and energy conservation
case studies.
This guide is an effort by EPA to contribute to an understanding of both pollution prevention and
energy assessments at commercial facilities. Companies from large to small, and government at all levels, as
well as assistance providers, could find the information contained in this directory useful.
This report was submitted in fulfillment of Contract #68-C7-0011, Work Assignment 21, by Science
Applications International Corporation, under the sponsorship of the U.S. Environmental Protection Agency.
This work covers a period from May to September, 1998.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Table of Contents
Executive Summary 1
Chapter 1 Introduction 11
1.1 Document Organization 11
1.2 What is an Industrial Assessment 11
1.3 Benefits of an Industrial Assessment 11
1.4 Who Should Participate in an Industrial Assessment 12
1.5 Establishing a Pollution Prevention Program 12
1.5.1 Management Support 13
1.5.2 Characterize Energy Usage and Waste Generation 13
1.5.3 Conduct Industrial Assessments 14
1.5.4 Review Program Effectiveness 14
Chapter 2 Energy and Pollution prevention Assessments 15
2.1 Pollution Prevention and Energy Conservation 15
2.1.1 Hierarchy 15
2.2 Assessment Methodology 16
2.2.1 Planning and Organization 17
2.2.2 Assessment Phase 18
2.2.2.1 Pre-Assessment Activities 18
2.2.2.2 Assessment 22
2.2.3 Feasibility Analysis Phase 24
2.2.3.1 Prioritization of Opportunities 24
2.2.3.2 Evaluation of Technical and Economic Feasibility 25
2.2.3.3. Generate an Assessment Report 25
2.2.4 Implementation 26
2.3 Example Facility Information Collection 26
Chapter 3 Evaluation Of Energy Conservation And Pollution Prevention Opportunities 39
3.1 Describe the Current Practices 39
3.1.1 Overview of Current Operations 39
3.1.2 Assumptions 40
3.1.3 Impacts 40
3.1.4 Raw Material Costs 40
3.1.5 Energy Costs 40
3.1.5.1 Electric Bills and Rates 40
3.1.5.2 Example of Gas Bills and Gas Rates 42
3.1.5.3 Fuel Oil Rates 43
3.1.6 Waste Management Costs 43
3.1.6.1 Hazardous and Regulated Non-hazardous Waste Disposal 44
3.1.6.2 Solid Waste Disposal 44
3.1.6.3 Air Emission Management Costs and Emission Fees 44
3.1.6.4 Sanitary and Storm Discharge Fees 44
3.2 Describe the Recommended Opportunity 45
3.3 Evaluate the Energy Conservation and Pollution Prevention Benefits 45
3.3.1 Energy Conservation Calculations 45
3.3.2 Pollution Prevention Calculations 46
3.4 Technical Evaluation of Energy Conservation and Pollution Prevention Proj ects 47
3.5 Economic Evaluation of Energy and Pollution Prevention Project Costs 39
3.5.1 Common Methods of Comparing Financial Performance 49
3.5.1.1 Payback Penod 49
3.5.1.2 Net Present Value 49
3.5.1.3 Internal Rate of Return 50
3.5.2 Additional Economic Analysis Tools 51
3.5.2.1 Life-Cycle Cost Analysis 51
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Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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3.5.2.2 Total Cost Accounting 52
3.6 Energy Conservation and Pollution Prevention Project Examples 53
3.6.1 Adjust Air Fuel Ration to Improve Boiler Efficiency 53
3.6.1.1 Current Practice and Observations 53
3.6.1.2 Recommended Action 53
3.6.1.3 Anticipated Savings 53
3.6.1.4 Implementation 54
3.6.2 Use Less Hazardous Inks in the Screen Printing Process 54
3.6.2.1 Current Practice and Observations 54
3.6.2.2 Recommended Action 54
3.6.2.3 Anticipated Savings 54
3.6.2.4 Payback Periods 55
3.6.2.5 Implementation 57
3.6.2.6 Net Present Value 57
3.6.2.7 Internal Rate of Return 58
Chapter 4 Sources Of Energy And Pollution 61
4.1 Electric Energy 61
4.1.1 Reduce Electrical Use 62
4.1.1.1 Distribution System 62
4.1.1.2 Use of Electricity in the Industry 63
4.1.2 Power Factor 63
4.1.2.1 Power Factor Improvement 64
4.1.2.2 General Considerations for Power Factor Improvements 66
4.1.3 Electrical Demand/Load Factor Improvement 66
4.1.3.1 Potential Savings 66
4.1.3.2 System Analysis 67
4.1.3.3 Ways to Reduce Demand 67
4.1.4 Reading the Bill 68
4.1.4.1 Example of a Typical Electric Bill 69
4.1.5 The Energy Charge 70
4.1.6 The Demand Charge 71
4.1.7 Power Demand Controls 71
4.1.8 Demand Shifting 71
4.2 Fossil Fuels 72
4.2.1 Energy Conservation Measures for Fossil Fuels 72
4.3 Alternative Energy Sources 73
4.4 Pollution Prevention And Waste Generation 73
4.4.1 Regulatory Requirements 74
4.4.1.1 Air Emission 74
4.4.1.2 Water Discharges 74
4.4.1.3 Solid Waste 74
4.4.1.4 Hazardous Waste 75
4.4.1.5 Record Keeping 75
4.4.2 Sources of Manufacturing Wastes 75
4.4.2.1 Processes Generating Wastes and Types of Wastes Generated 76
4.4.2.2 Industry Compendium of Processes Producing Wastes 76
Chapter 5 Industrial Operations 87
5.1 Office Operations 87
5.1.1 Waste Description 87
5.1.2 Pollution Prevention Opportunities 87
5.1.2.1 Source Reduction 87
5.1.2.2 Recycling 90
5.2 Materials Management/Housekeeping 91
5.2.1 Process Description 91
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5.2.2 Waste Description 92
5.2.3 Pollution Prevention Opportunities 92
5.2.3.1 Source Reduction 92
5.2.3.2 Recycling 98
5.3 Facility Maintenance 101
5.3.1 Process Description 101
5.3.2 Waste Description 101
5.3.3 Pollution Prevention Opportunities 101
5.3.3.1 Source Reduction 101
5.3.3.2 Recycling 103
5.4 Metal Working 106
5.4.1 Process Description 107
5.4.2 Waste Description 107
5.4.3 Pollution Prevention Opportunities 108
5.4.3.1 Source Reduction 110
5.4.3.2 Recycling Ill
5.5 Degreasing 112
5.5.1 Process Description 112
5.5.2 Waste Description 112
5.5.3 Pollution Prevention Opportunities 112
5.5.3.1 Source Reduction 112
5.5.3.2 Recycling 133
5.6 Chemical Etching 137
5.6.1 Process Description 137
5.6.1.1 Phosphatmg 137
5.6.1.2 Chromate Conversion Coating 137
5.6.2 Waste Description 138
5.6.3 Pollution Prevention Opportunities 138
5.6.3.1 Source Reduction 139
5.6.3.2 Recycling 143
5.7 Plating Operations 143
5.7.1 Process Description 144
5.7.1.1 Surface Cleaning and Preparation 144
5.7.1.2 Surface Modification 144
5.7.1.3 Rinse 144
5.7.2 Waste Description 144
5.7.3 Pollution Prevention Opportunities 145
5.7.3.1 Source Reduction 146
5.7.3.2 Recycling 154
5.8 Paint Application 156
5.8.1 Process Description 156
5.8.2 Waste Description 156
5.8.3 Pollution Prevention Opportunities 156
5.8.3.1 Source Reduction 156
5.8.3.2 Recycling 166
5.9 Paint Removal 166
5.9.1 Process Description 166
5.9.2 Waste Description 167
5.9.3 Pollution Prevention Opportunities 167
5.9.3.1 Source Reduction 167
5.9.3.2 Recycling 177
5.10 Pnntmg 178
5.10.1 Process Description 178
5.10.1.1 Image Processing 179
5.10.1.2 Proof 179
5.10.1.3 Plate Processing 179
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5.10.1.4 Makeready 181
5.10.1.5 Printing 181
5.10.1.6 Finishing 181
5.10.2 Waste Description 181
5.10.3 Pollution Prevention Opportunities 183
5.10.3.1 Source Reduction 183
5.10.3.2 Recycling 186
5.11 Waste Water Treatment 188
5.11.1 Process Description 189
5.11.1.1 Trickling Filters 189
5.11.1.2 Oxidation 189
5.11.1.3 Activated Sludge 190
5.11.1.4 Chlorination and Other Disinfection Techniques 190
5.11.2 Waste Description 191
5.11.3 Pollution Prevention Opportunities 191
5.11.3.1 Source Reduction 191
5.11.3.2 Recycling 191
Chapter 6 Electric Equipment 193
6.1 Motors 193
6.1.1 Idle Running 193
6.1.2 Efficiency at Low Load 193
6.1.3 High-Efficiency Motors 195
6.1.4 Reduce Speed/Variable Drives 197
6.1.4.1 Variable Frequency AC Motors 197
6.1.4.2 Solid State DC Dnves 199
6.1.4.3 Mechanical Drives 199
6.1.4.4 Single-Speed Reduction 200
6.1.4.5 Two-Speed Motors 200
6.1.5 Load Reduction 200
6.1.6 High-Starting Torque 200
6.1.7 Rewound Motors 201
6.1.8 Motor Generator Sets 201
6.1.9 Belts 201
6.2 Lighting 202
6.2.1 Lighting Standards 202
6.2.2 Light Meter Audit 205
6.2.3 Methods to Reduce Costs 205
6.2.3.1 Turn off Lights 205
6.2.3.2 Automatic Controllers 206
6.2.3.3 Remove Lamps 206
6.2.3.4 Maintain Lamps 206
6.2.3.5 Lower-Wattage Fluorescent Lamps and Ballasts 207
6.2.3.6 Fluorescent Retrofit Reflectors 208
6.2.3.7 Lamp Relocation 209
6.2.3.8 Lighting System Replacement 210
6.2.4 Summary of Different Lighting Technologies 210
6.2.4.1 Incandescent 211
6.2.4.2 Fluorescent 211
6.2.4.3 High Energy Discharge 211
Chapter 7 Heat 213
7.1 Boilers 213
7.1.1 Boiler Operation and Efficiency 213
7.1.1.1 Boiler Efficiency Tips 214
7.1.1.2 Combustion in Boilers 217
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency jx
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7.1.2 Typical Performance Improvements 220
7.1.2.1 Adjustment of Fuel and Air Ratio 220
7.1.2.2 Elimination of Steam Leaks 221
7.1.2.3 Variable Frequency Drives for Combustion Air Blowers 221
7.1.2.4 Maintenance of Steam Traps 222
7.1.2.5 High Pressure Condensate Return Systems 222
7.2 Heat Recovery Systems 223
7.2.1 General Considerations 223
7.2.2 Types of Heat Recovery Equipment 224
7.2.2.1 Economizers 224
7.2.2.2 Heat Pipes 225
7.2.2.3 Shell and Tube Heat Exchangers 225
7.2.2.4 Regenerative Unit (Heat Wheel) 225
7.2.2.5 Recuperators 225
7.3 Heating Systems 226
7.3.1 Destratification Fans 226
7.3.1.1 Ceiling Fans 226
7.3.1.2 Ducting 227
7.3.2 Electric Heating 227
7.3.2.1 Radiant Heaters 228
7.3.2.3 Types of Radiant Systems 228
7.3.2.4 Applications 228
7.4 Furnaces And Burners 229
7.4.1 Burner Combustion Efficiency 229
7.4.2 Premix Burner Systems 230
7.4.3 Nozzle Mix Burners 230
7.4.4 Furnace Pressure Controls 231
7.4.5 Furnace Efficiency 231
7.4.6 Furnace Covers 232
7.5 Cogeneration 232
7.5.1 The Economics of Cogeneration 232
7.5.2 Cogeneration Cycles 233
7.5.2.1 Cogeneration High-Spot Evaluation 234
7.5.2.2 Estimate of Savings 236
7.8 Thermoenergy Storage Systems 237
7.8.1 High Spot Evaluation 237
7.8.2 Electric Load Analysis 238
Chapters Prime Movers of Energy 241
8.1 Pumps 241
8.1.1 Operation 241
8.1.1.1 Pump Survey 241
8.1.1.2 Energy Conservation Measures 241
8.1.2 Considerations for Installation Design 248
8.2 Fans 248
8.2.1 Inlet Vane Control 250
8.2.2 Reduced Speed 250
8.2.3 Variable Speed 250
8.3 Air Compressors 250
8.3.1 Waste Heat Recovery 251
8.3.2 Operating Pressure Reduction 251
8.3.3 Elimination of Air Leaks 252
8.3.4 Cooling Water Heat Recovery 255
8.3.5 Compressor Controls 255
8.3.6 Outside Air Usage 256
8.3.7 Compressor Replacement 256
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8.3.8 Low Pressure Blowers 257
8.3.9 General notes on Air Compressors 257
Chapter 9 Thermal Applications 259
9.1 Cooling Systems 259
9.1.1 Cooling Towers 259
9.1.2 Typical Performance Improvements 263
9.1.3.1 Condenser Water Temperature Adjustments 263
9.1.3.2 Chilled Water Supply Temperature Adjustment 263
9.1.3.3 Variable Speed (or Two-Speed) Motors for Cooling Tower Fans 264
9.1.3.4 Hot Gas Defrost 264
9.2 Absorption Refrigeration 265
9.2.1 Operation 266
9.2.1.1 Capacity 267
9.2.1.2 Operating Problems 267
9.2.1.3 Direct-Fired two-Stage Absorption Refrigeration 268
9.3 Mechanical Refrigeration 268
9.3.1 Mechanical Compression 268
9.3.2 Methods to Reduce Costs 269
9.3.2.1 Use Refrigeration Efficiently 270
9.3.2.2 Reduce the Condensing Temperature (Pressure) 270
9.3.2.3 Raise the Evaporator Temperature (Pressure) 272
9.3.2.4 Operate Multiple Compressors Economically 272
9.3.2.5 RecoverHeat 273
9.3.2.6 Reduce Operation of Hot-Gas Bypass 273
9.3.2.7 Optimize Refrigeration Performance 273
9.4 Insulation 274
9.4.1 Insulation of Pipes 274
9.4.1.1 Steam and Hot Water. 275
9.4.1.2 Cold Water 275
9.4.2 Insulation of Tanks 275
9.4.2.1 Hot Media 276
9.4.2.2 ColdMedia 276
9.4.3 Building Insulation 276
9.4.4.1 Dock Doors 277
9.4.4 Recommended Insulation Standards 277
9.4.5.1 Lowest Cost System 277
9.4.5.2 Economic Factors to be Considered in Basic Insulation Selection 277
9.4.5.3 Finish Factors Influencing Insulation Selection 278
9.4.5 Process Equipment 278
9.4.6.1 Injection Mold Barrels 278
Chapter 10 HVAC 281
10.1 Air Conditioning 281
10.1.1 Equipment 281
10.1.1.1 Fans 281
10.1.1.2 Coils 281
10.1.1.3 Air Washers 282
10.1.1.4 Air Cleaners 282
10.1.1.5 Humidifiers 283
10.1.1.6 Controls 283
10.1.1.7 Distribution System 283
10.1.2 Psychrometry 283
10.1.3 Computation 284
10.1.4 Energy Conservation 284
10.1.4.1 Operate Systems Only When Needed 285
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency xi
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10.1.4.2 Eliminate Overcooling and Overheating 286
10.1.4.3 Eliminate Reheat 288
10.1.4.4 Economizer Cycle 288
10.1.4.5 Minimize Amounts of Makeup and Exhaust Air 291
10.1.4.6 Minimize the Amount of Air Delivered to a Conditioned Space 291
10.1.4.7 Recover Energy 293
10.1.4.8 Maintain Equipment 293
10.2 HVAC Systems 293
10.2.1 Equipment Sizing Practices 294
10.2.1.1 Reducing Capacity by Fan/Pump Slowdown 294
10.2.1.2 Maximize HVAC Savings 295
10.2.2 Design for Human Comfort 295
10.2.2.1 Factors Affecting Comfort 297
10.2.3 General Types of Building Heating and Cooling 302
10.3 Ventilation 305
10.3.1 Losses 306
10.3.1.1 Room Air 306
10.3.1.2 High-Temperature Exhaust 306
10.3.1.3 Air-Water Mixture 307
10.3.2 Balance Air Flows 307
10.3.2.1 Shut off Fans 307
10.3.2.2 Reduce Volume 307
10.3.2.3 Reduce Temperature 308
10.3.2.4 Recover Heat 308
10.3.3 Types of Heat Exchangers 309
10.3.3.1 Rotary Heat Exchanger 309
10.3.3.2 Sealed Heat Pipe Exchanger. 309
10.4.5.1 Plate Heat Exchanger 309
10.4.5.2 Coil-Run-Around System 309
10.4.5.3 Hot Oil Recovery System 310
Appendix A Information Resources A-l
EPA Regional Offices A-l
Energy Conservation Resources A-2
Pollution Prevention Publications A-3
Technology Transfer Information Sources A-9
Pollution Prevention Websites A-57
Appendix B Thermodynamic Analysis B-l
Psychrometrics B-l
Properties of Air B-2
Air Conditioning Processes B-6
Heat Loss Calculations B-10
Heat Gain Calculations B-12
Appendix C Energy and Waste Instrumentation for Audits C-l
Appendix D Definitions D-l
Appendix E Energy Conservation Opportunity Case Studies E-l
Case Study #1: Implement Periodic Inspection and Adjustment of
Combustion in a Gas Fired Boiler. E-3
Case Study #2: Implement Periodic Inspection and Adjustment of
Combustion in a Oil Fired Boiler E-5
Case Study #3: Energy Saving From Installation of Ceiling Fans E-7
Case Study #4: Install Infrared Radiant Heaters E-9
xii Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Case Study #5: Repair Compressed Air Leaks E-13
Case Study #6: Install a Low Pressure Blower to Reduce Compressed Air Use E-17
Appendix F Pollution Prevention Opportunity Case Studies F-l
Case Study #1: Construction and Demo lition Waste Recycling F-3
Case Study #2: Packaging Reuse F-5
Case Study #3: Oil Analysis Program F-7
Case Study #4: Maintenance Fluid Recycling F-9
Case Study #5: Metal Working Fluid Substitution F-ll
Case Study #6: Install an Automated Aqueous Cleaner F-13
Case Study #7: Recycling of Cleaner Through Filtration F-15
Case Study #8: Efficient Rinsing Set-up For Chemical Etching F-17
Case Study #9: Waste Reduction in the Chromate Conversion Process F-19
Case Study #10: Plating Process Bath Maintenance F-21
Case Study #11: Closed-Loop Plating Bath Recycling Process F-23
Case Study #12: Water-Borne Paint As a Substitute for Solvent-Based Coatings F-25
Case Study #13: High Velocity Low Pressure (HVLP) Paint System F-27
Case Study #14: Replacing Chemical Stripping with Plastic Media Blasting F-29
Case Study #15: White Water and Fiber Reuse in Pulp and Paper Manufacturing F-31
Case Study #16: Chemical Substitution in Pulp and Paper Manufacturing F-33
Case Study #17: On-site Recycling F-35
Case Study #18: Solvent Reduction in Commercial Printing Industry F-37
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency xiii
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List of Exhibits
Exhibit 2.1 Environmental Management Hierarchy 16
Exhibit 2.2 Assessment Procedures 17
Exhibit 2.3 Block Diagram Model 19
Exhibit 2.4 Example Facility Description 27
Exhibit 2.5 Mars Screen Printing Facility Layout 28
Exhibit 2.6 Example Process Description 29
Exhibit 2.7 Example Flow Diagram for the Mars Screen Printing, Screen Making Operation 30
Exhibit 2.8 Example Flow Diagram for the Mars Screen Printing, Printing Operation 30
Exhibit 2.9 Example Flow Diagram for the Mars Screen Printing, Cleaning Operation 31
Exhibit 2.10 Electrical Summary 31
Exhibit 2.11 Natural Gas Summary 32
Exhibit 2.12 Fuel Oil Summary 32
Exhibit 2.13 Summary of Energy Usage 33
Exhibit 2.14 Summary Energy Costs 33
Exhibit 2.15 Electrical Costs 34
Exhibit 2.16 Electricity Usage 34
Exhibit 2.17 Example Raw Material List for Mars Screen Printing 35
Exhibit 2.18 Example Waste Generation Data for Mars Screen Printing 35
Exhibit 2.19 Example Equipment List and Pertinent Information 36
Exhibit 2.20 Energy Conservation and Pollution Prevention Opportunities for Mars Screen Printing 36
Exhibit 2.21 Example Decision Matrix 37
Exhibit 3.1 Relation of Demand (kW) to Energy (kWh) 41
Exhibit 3.2 Sample Natural Gas Bill 42
Exhibit 3.3 Common Units of Measure and Conversions to BTUs (U.S. Dept of Commerce, 1974) 46
Exhibit 3.4 Units of Measure for Various Applications (U.S. Dept of Commerce, 1974) 46
Exhibit 3.5 Typical Technical Evaluation Criteria 48
Exhibit 3.6 TCA Cost Categories 53
Exhibit 3.7 Estimated Annual Cost of Environmentally Preferred Ink at Mars Screen Printing 55
Exhibit 3.8 Annual Cost of Current Ink Formulation at Mars Screen Printing 56
Exhibit 3.9 Estimated Annual Cost of Environmentally Preferred Ink at Mars Screen Printing 56
Exhibit 3.10 NPV Calculation for Mars Screen Printing 58
Exhibit 3.11 IRR Calculations for Mars Screen Printing 59
Exhibit 4.1 Components of Electrical Power 64
Exhibit 4.2 Power Factor Correction 65
Exhibit 4.3 Highest Demands for Hypothetical Billing Period of May 68
Exhibit 4.4 Example Electric Bill 69
Exhibit 4.5 Compendium of Processes Producing Waste 77
Exhibit 5.1 Available Technologies for Alternatives to Chlorinated Solvents
for Cleaning and Degreasing 114
Exhibit 5.2 Available Technologies for Cleaning and Degreasing 124
Exhibit 5.3 CEVC Cleaning Cycle 128
Exhibit 5.4 Five-stage Iron or Zinc Phosphating Process 137
Exhibit 5.5 Typical Conversion Coating Process for Aluminum 138
Exhibit 5.6 Simplified Material Balance of a Chemical Etching Process Step 138
Exhibit 5.7 Immersion Rinse System Schematic 140
Exhibit 5.8 Schematic of a Conveyorized Paints and Coatings Operation 141
Exhibit 5.9 Major Metal Plating Wastes and Constituents 146
Exhibit 5.10 Waste Minimization Opportunities Available to the Metal Plating Industry 157
Exhibit 5.11 Waste Minimization/Pollution Prevention Methods and Technologies 148
Exhibit 5.12 Process Flow Diagram for a Typical Commercial Printing Operation 180
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Exhibit 5.13 Wastes from Commercial Printing 182
Exhibit 5.14 One and Two Stage Trickling Filter Systems 190
Exhibit 6.1 Motor Efficiency 194
Exhibit 6.2 Typical Efficiency Comparison for 1800 rpm Motors: General Electric 196
Exhibit6.3 Typical Efficiency Comp arisen for 1800 rpm Motors: Westinghouse 197
Exhibit6.4 FanDrive: Variable Speed vs. Valve Control 198
Exhibit 6.5 Results for a Fan Controlled by Damper. 199
Exhibit 6.6 Fan Horsepower with Variable Speed Motor 199
Exhibit 6.7 Dupont Recommended Light Levels for Service Building Interiors 202
Exhibit 6.8 Dupont Recommended Illumination Levels for General Manufacturing 204
Exhibit 6.9 Dupont Recommended Illumination Levels for Outdoor Areas 205
Exhibit 6.10 Alternative Lighting Systems Approximate Initial Lumens per Watt Including Ballast 210
Exhibit 7.1 Optimal Flue Gas Composition 214
Exhibit 7.2 Boiler Efficiency (Natural Gas) 215
Exhibit 7.3 Effect of Scale Thickness in Boilers on Heat Transfer 216
Exhibit 7.4 Effects of Feedwater Preheat on Boiler System Efficiency 216
Exhibit 7.5 Efficiency Loss Due to Blowdown 217
Exhibit 7.6 Ultimate CO2 Values 218
Exhibit 7.7 Boiler Combustion Mixtures 218
Exhibit 7.8 Combustion Efficiencies 219
Exhibit 7.9 Air/Fuel Ratio Reset: Costs and Benefits 220
Exhibit 7.10 Steam Leak Repair: Costs and Benefits 221
Exhibit 7.11 (ASD)- Variable Frequency Drives: Costs and Benefits 221
Exhibit 7.12 Steam Trap Repair: Costs and Benefits 222
Exhibit 7.13 Condensate Return Systems: Costs and Benefits 223
Exhibit 7.14 Fuel Savings Realized by Preheating Combustion Air 224
Exhibit 7.15 Stratification and Destratification of Air 227
Exhibit 7.16 Infrared Radiant Heater 229
Exhibit 7.17 Percent Excess Air From CO2 Reading 230
Exhibit 7.18 Cogeneration Cycles 234
Exhibit 7.19 Gas-Turbine Cycle 235
Exhibit 7.20 Steam-Turbine Cycles 236
Exhibit 7.21 Thermal Storage High Spot Evaluation 238
Exhibits. 1 Typical Centrifugal Pump Characteristics 244
Exhibit 8.2 Centrifugal Pump Curve 245
Exhibit 8.3 Typical Pump and System Curves, Driven by Adjustable Speed Drive 246
Exhibit 8.4 Typical Pump and System Curves for Pump with Throttling Valve 247
Exhibit 8.5 Pump Power Requirements for Throttling and Adjustable Speed Motors 247
Exhibit 8.6 Comparative Energy Usage with Various Methods of Control 248
Exhibit 8.7 Nominal Efficiency of Fans at Normal Operating Conditions 249
Exhibit 8.8 Effect of Volume Control on Fan Horsepower 249
Exhibit 8.9 Compressor Waste Heat Recovery: Costs and Benefits 251
Exhibit 8.10 Pressure Reduction: Costs and Benefits 252
Exhibit 8.11 Fuel and Air Losses Due to Compressed Air Leaks 252
Exhibit 8.12 Leakage Reduction: Costs and Benefits 252
Exhibit 8.13 Waste Water Heat Recovery: Costs and Benefits 255
Exhibit 8.14 Screw Compressor Controls: Costs and Benefits 255
Exhibit 8.15 Outside Air Usage: Costs and Benefits 256
Exhibit 8.16 Optimum Sized Equipment: Costs and Benefits 257
Exhibit 8.17 Reduce Compressed Air Usage: Costs and Benefits 257
Exhibit 9.1 Comparison of F. D. Blower Tower vs. Propeller Tower for 400 Tons 260
Exhibit 9.2 Mechanical Forced-Draft Cooling Tower 260
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Exhibit 9.3 Induced Draft Cooling Tower. 261
Exhibit 9.4 Free Cooling/Air Preheat 261
Exhibit 9.5 Indirect Free Cooling Loop 262
Exhibit 9.6 Free Cooling (Water Side Economizer) Define Operating Conditions 262
Exhibit 9.7 Condenser Water Supply Temperature Reset: Costs and Benefit 263
Exhibit 9.8 Chilled Water Supply Temperature Reset: Costs and Benefits 263
Exhibit 9.9 Two-Speed Motors on Cooling Tower Fans: Costs and Benefits 264
Exhibit 9.10 Temperature vs. Time of Blower Operation 265
Exhibit 9.11 Evaporator Coils Defrost: Costs and Benefits 265
Exhibit 9.12 Two-Stage Absorption Chiller 266
Exhibit 9.13 Capacity as Function of Temperature of Heat Source and Cooling Water 267
Exhibit 9.14 Cost Comparison of Mechanical and Absorption Refrigeration 268
Exhibit 9.15 Mechanical Compression Refrigeration System 269
Exhibit 9.16 Pressure-Enthalpy Diagram 270
Exhibit 9.17 Partial Load Requirement for Centrifugal Refrigeration Compressors 271
Exhibit 9.18 Recommended Thickness for Pipe and Equipment Insulation 274
Exhibit 9.19 Steam Lines and Hot Water Pipes: Costs and Benefits 275
Exhibit 9.20 Chilled Water Pipes: Costs and Benefits 275
Exhibit 9.21 Hot Tanks: Costs and Benefits 276
Exhibit 9.22 Cold Tanks: Costs and Benefits 276
Exhibit 9.23 Dock Doors: Costs and Benefits 277
Exhibit 9.24 Insulate Equipment: Costs and Benefits 278
Exhibit 10.1 Air Conditioning Equipment 282
Exhibit 10.2 Modified Air Conditioning System Controls 287
Exhibit 10.3 Economizer Cycle (Outdoor Temp. Switchover, Mixing Temp. Control) 289
Exhibit 10.4 Economizer Cycle (Outdoor Temp. Switchover, Chilled H20 Control) 289
Exhibit 10.5 Economizer Cycle (Enthalpy Switchover, Chilled H20 Control) 289
Exhibit 10.6 Total Savings 292
Exhibit 10.7 Effect of Volume Control on Horsepower. 293
Exhibit 10.8 Energy Use in Buildings 293
Exhibit 10.9 Load vs. Efficiency 294
Exhibit 10.10 Control Valve Characteristics 295
Exhibit 10.11 Heating and Cooling Loads 296
Exhibit 10.12 Comfort Zone Detail 297
Exhibit 10.13 Biological Factors Affecting Comfort 298
Exhibit 10.14 Heat Flux Generated by Various Activities 298
Exhibit 10.15 Clothing Resistance 299
Exhibit 10.16 Garment Insulation Values 300
Exhibit 10.17 Convection Heat Transfer Coefficients 301
Exhibit 10.18 Sprayed Coil Dehurmdifier 302
Exhibit 10.19 Evaporative Cooling & Air Washer 302
Exhibit 10.20 Humidity Control Through Cooling Override 303
Exhibit 10.21 Single Zone - All Direct Control from Space Thermostat 303
Exhibit 10.22 Dual Duct Air Handling System 304
Exhibit 10.23 Multizone Air Handling Unit 304
Exhibit 10.24 Hybrid VAV Control System 305
Exhibit E.I Natural Gas Fuel Savings E-4
Exhibit E.2 Liquid Petroleum Fuel Savings E-6
ExhibitE.3 Condition of Pneumatic System at Time of Site Visit E-13
Exhibit E.4 Cost of Compressed Air Leaks at This Plant E-14
Exhibit E.5 Summary of Savings E-14
Exhibit E.6 Implementation Costs E-15
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Exhibit F.I Cost Analysis for a Demolition Waste Recycling Program F-3
Exhibit F.2 Monthly Operating Cost Comparison for Polystyrene Packaging Peanuts and
Shredded Paper Packaging F-5
Exhibit F. 3 Economic Comparison of Maintenance Schedule versus Oil Analysis Programs F-7
Exhibit F.4 Annual Operating Cost Comparison for Waste Solvent Disposal and Waste
Solvent Recycling F-9
Exhibit F. 5 Waste Volume Reduction by Using the Automated Aqueous Washer F-13
Exhibit F.6 Annual Operating Cost Comparison for Single Use Rinse and Recycling Rinse F-15
ExhibitF.7 Drag-out Recovery as aFunction of Recycle Rinse Ratio F-18
ExhibitF.8 Economic Comparison of Wet Sludge Disposal versus Dried Sludge Disposal F-19
Exhibit F.9 Operating Cost Analysis for Recommended Bath Maintenance Practices F-21
Exhibit F. 10 Economic Evaluation of Evaporator Installation F-24
Exhibit F. 11 Annual Operating Cost Comparison for Water-Borne Paint Application and
Solvent Based Paint Application F-26
Exhibit F. 12 Economic Comparison of Air-Assisted Paint Guns versus High Velocity
Low Pressure Paint Application F-27
Exhibit F. 13 Operating Cost Comparison for Sodium Hydroxide Paint Removal and
Plastic Media Blasting F-29
Exhibit F. 14 Summary of Financial Data for White Water and Fiber Reuse F-31
Exhibit F. 15 Summary of Financial Data for Aqueous/Heavy Metal Conversion F-33
Exhibit F. 16 Economic Comparison of On -Site versus Off-Site Ink Recycling F-36
Exhibit F. 17 Cost Analysis for a 5-Gallon In-Process Solvent Recycling F-37
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Executive Summary
EXECUTIVE SUMMARY
This document is intended to provide guidance to those who are interested in performing industrial
assessments at industrial or other commercial facilities. This document is not intended to be an all-
encompassing guide to industrial assessments for pollution prevention and energy conservation but a general
reference. The U.S. EPA would like to thank Dr. Michael Muller and staff of The Office of Industrial
Productivity & Energy Assessment, Rutgers University, and the Department of Energy, Office of Industrial
Technology, for their efforts in producing the first version of this document. In addition, the U.S. EPA
would like to acknowledge and thank those who have performed the case study assessments.
This guide presents an overview of industrial assessments and the general framework for
conducting an assessment. In addition, basic information about waste generating industrial operations and
energy consuming equipment is provided. This guide can be used by both facility personnel to conduct in-
house assessments of operations and those who are interested in providing industrial assessments to
industrial and commercial facilities since the framework for an assessment will be the same for both.
E.I What Is An Industrial Assessment
An industrial assessment is an in-depth review of existing operations to increase efficiency of the
operation through pollution prevention and energy conservation. The industrial assessment is an essential
and valuable tool used to:
• define the specific characteristics of a whole facility that consumes energy and generates wastes,
• identify a range of energy conservation and pollution prevention options,
• evaluate the options based on a set of criteria, and
• select the most promising options for implementation.
One should find the industrial assessment instrumental to systematically identifying opportunities
to increase energy efficiency and decrease waste generation. Assessments can be divided into three types:
energy, waste (hazardous and non-hazardous) or a combination of the two. Energy conservation and
pollution prevention are complementary activities. That is, generally actions that conserve energy reduce
the quantity of wastes produced by energy-generating processes, and actions that reduce production wastes
lower the expenditure of energy for waste handling and treatment. It is a well used and proven approach to
identifying cost saving energy conservation and pollution prevention technologies that enhance a facility's
performance.
Benefits of Industrial Assessments
• Economics
• Reduced energy consumption
• Reduced waste generation
• Increased operation efficiency
• Reduced liability
• Reduced compliance issues
• Increased worker health and
safety
• Improved public relations and
public image
• Better monitoring of operation
performance
Energy conservation and pollution prevention
opportunities provide many benefits. An industrial assessment is
intended to increase the efficient use of energy and materials. The
process of performing an assessment provides useful information
for facility personnel to evaluate a particular operation or the
entire facility. Benefits resulting from industrial assessments
include economics, reduced liability, reduced energy consumption,
increased worker health and safety, improved public relations, and
compliance with regulations.
Any facility that wishes to find opportunities to increase
the efficiency of their operations should conduct an industrial
assessment. Businesses have strong incentives to increase
operation efficiency as this increases competitive edge.
Operations that are more efficient can operate with lower expenses
and decrease their cost per unit production. An industrial
assessment is not something that is performed only once and
options are implemented. Industrial assessments should be used
Notes
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Executive Summary
JT , as a tool to periodically examine operation efficiency and re-evaluate current opportunities. As new
technologies become available, an opportunity that was not economically or perhaps technically feasible
when the last industrial assessment was performed can become a viable opportunity for a facility.
Pollution Prevention means "source reduction" as defined under the Pollution Prevention Act, and
other practices that reduce or eliminate the creation of pollutants through:
• increased efficiency in the use of raw materials, energy, water, or other resources, or
• protection of natural resources by conservation.
A pollution prevention program provides the mechanism to a facility for continuous self-evaluation
and improvement. Assessments are key components of a facility's pollution prevention program. A pollution
prevention program provides the framework for a facility to develop goals, establish a working group,
provide reports on energy usage and waste generation, and mechanisms to track results of implemented
projects.
The most important element of a pollution prevention program is management support. Top
management must demonstrate support for the program because employees who believe that the program is
not supported by management get the attitude of "They don't care, why shoul
and should be demonstrated through several mechanisms:
• Circulating a written policy
• Establishing goals for reducing waste generation and energy consumption,
• Establishing a working group,
• Providing training on conservation techniques, and
• Publicizing and rewarding successes.
After a facility has established its goals and objectives for its pollution prevention program, it is
ready to conduct industrial assessments.
E.2 Conducting an Industrial Assessment
The assessment process begins with the recognition of the need for pollution prevention and energy
conservation. An industrial assessment consists of four general phases:
1. Planning and Organization
2. Assessment Phase
3. Feasibility Analysis Phase, and
4. Implementation
This document will focus on phases 1 -3 and will briefly discuss phase 4.
The first step in an assessment is to establish the assessment team. The team should be composed of
personnel from many areas of the facility. Core team members will include those that are involved with the
operation or process, both supervisors and staff, as well as energy management and environmental staff.
Other areas that may be included are health and safely, facility or civil engineering, quality control,
accounting and finance, purchasing and contracting, and legal.
Once the assessment team is established, the team will need to determine:
• What processes will be assessed.
• Who will be involved with the assessment.
• When will the assessment take place.
• How will the team approach the assessment.
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E.2.1 Planning and Organization
The planning and organization of an industrial assessment is important to obtain the desired results.
The assessment team should decide on a data collection format for the assessment. The team may use
standard worksheets provided in BPA's Facility Pollution Prevention Guide or may develop their own
assessment worksheets, questionnaires, or checklists. The team should prepare an assessment agenda and
schedule the assessment in advance to coincide with a particular operation of interest
E.2.2 Assessment Phase
The second phase is the assessment phase. This phase can be broken down into two parts: the pre-
assessment and the actual assessment.
E.2.2.1 Pre-Assessment
Prior to the assessment it is a good idea to collect information, allowing the assessment team to
review and prepare additional questions. Information that should be collected includes: a facility
description, a process description, a process flow diagram, major energy consuming equipment, raw
material information, and energy and waste data collection. The team should collect information for a 12-
month period and all information should be for the same 12-month period. The energy information should
be converted to a standard unit of measure such as the British Thermal Unit (BTU) and graphed to view
energy usage trends. Waste data can be summarized in a table format for review and reference. Collection
of this data prior to the assessment will also give the assessment team an idea of where its attention should
be focused during the actual assessment.
£.2.2.2 Assessment
During the actual assessment, the team should begin with a review of operations and data collected
prior to the assessment with persons who work in the area on a day-to-day basis. After the team has
discussed the operations, the team should take a walk-through the facility to observe actual operations.
During the walk-through team members should talk with personnel to confirm operational procedures and
information collected prior to the assessment. After the walk-through, the team members should brain
storm ideas for energy conservation and pollution prevention. This is the point where the team will generate
a list of ideas without regard to cost or feasibility. Once the list of ideas has been generated, the team can
collect information that it needs to complete a feasibility analysis.
E.2.3 Feasibility Analysis Phase
The third phase of the assessment is the feasibility analysis. This portion of the assessment is
usually completed over several days after the assessment and will include both a technical feasibility
analysis and an economic feasibility analysis.
The feasibility analysis should begin with a prioritization of the identified opportunities. Because
of time and resource constraints many facilities will have to choose among opportunities for
implementation. The team can develop a relative ranking of opportunities using a tool know as the decision
matrix. The decision matrix tool can be used to rank the identified opportunities using a list of critical
factors that are important to the facility allowing an "apples-to-apples" comparison of the options.
The feasibility analysis should be documented for presentation to other facility personnel or to
management. This documentation should include a clear description of current operations and practices, a
description of the opportunity, the benefits of that would result from implementation of the opportunity, as
well as a technical and economic evaluation of the opportunity. The detail of the technical and economic
evaluations will vary depending on facility requirements and the complexity of the opportunity.
E.2.3.1 Technical Feasibility
The technical feasibility analysis can include:
• Calculation of energy consumption and waste generation reductions,
• Determination of how much labor will be involved with the changes in operations or equipment,
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• Evaluation of space constraints,
• Evaluation of safety and health aspects for employees,
• Compatibility with current operations and materials, and
• Changes in annual operating and maintenance costs.
There are many other factors that can be included in a technical evaluation. All of the factors listed
above may not apply to every opportunity. The team should determine what criteria are applicable to a
specific opportunity based on the complexity and applicability of implementation and impact on operations.
E.2.3.2 Economic Feasibility
An economic feasibility analysis is a process in which financial costs, revenues, and savings are
evaluated for a particular project. This analysis is necessary to evaluate the economic advantages of
competing projects and is used to determine how to allocate limited resources. Three methods of comparison
are currently is widespread use: Payback Period, Net Present Value, and Internal Rate of Return. The
method of economic evaluation is often determined by internal company requirements. In addition, Life
Cycle Costing (LCC) and Total Cost Accounting (TCA) tools are used to establish economic criteria to
justify energy conservation and pollution prevention. TCA is used to describe internal costs and savings,
including environmental criteria. LCC includes all internal costs plus external costs incurred throughout the
entire life cycle of a product, process, or activity.
E.2.4 Implementation
Management support is the most important element in successfully implementing energy
conservation and pollution opportunities. Actions taken to implement energy conservation and pollution
prevention projects vary greatly from project to project and company to company. One facility may decide to
use in-house expertise to implement projects while another may find it beneficial to contract the work to an
outside organization. After successful implementation of the project, it is beneficial to track and advertise the
resulting cost savings and impacts to give feedback to facility personnel. This allows personnel to see the
results of changes in procedures or installation of new equipment and to participate in the energy conservation
and pollution prevention program.
E.3 Sources of Energy and Pollution
Sources of energy and pollution come in a great variety. Energy is generated from many sources
including:
• Nuclear, • Wind,
• Coal-fired electric generation plants, • Solid waste incinerators,
• Fossil Fuels, • Geothermal, and
• Solar, • Biomass fuels including wood, peat, and
wood charcoal.
• Hydroelectric,
These sources are used to generate energy mainly in the form of electricity, because it is more easily
transmitted over long distances and can be used for more tasks. These sources are also used to generate
steam and compressed air for use in industrial operations.
Energy generation, as well as many industrial operations, produce pollution. Energy generation
operations impact the environment either through air emissions from the burning of fossil fuels, wastes from
the maintenance of equipment and other operations, flooding of areas by hydroelectric dams, and mining or
drilling of fossil fuels. Industrial operations also impact the environment in a similar manner.
Over the past three decades, the generation of wastes that are released to the environment through
any media has become more stringently regulated. The regulations that have been enacted require much
record keeping, documenting a facility's status for permitting discharges to the air, and water, and for
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Executive Summary
disposal. Regulations such as the Clean Air Act (CAA) and the National Pollutant Discharge Elimination
System (NPDES) require facilities to apply for and obtain permits to discharge pollutants from their
operations. The limits placed on a facility as a result of their discharge permits may impact a facility's
production capabilities and the types of equipment that will be required to treat and monitor discharges.
E.4 Industrial Operations
There are many common applications that are applied in a variety of ways through out industry.
Pollution prevention opportunities exist for a wide variety of industrial operations. Even though these
operations are applied in a variety of ways there are many common opportunities for pollution prevention.
The following twelve areas have widespread application in today's industrial operations.
• Office Operations • Plating Operations
• Materials Management/ Housekeeping • Paint Application
• Facility Maintenance • Paint Removal
• Metal Working • Paper and Pulp Manufacturing
• Cleaning & Degreasing • Commercial Printing
• Chemical Etching • Waste Water Treatment
These operations generate similar types of wastes without regard to the specific industry. As such,
there are many common opportunities for pollution prevention that can be applied to many industrial
operations. There are many sector guides that focus on these areas available from the U.S. EPA (see
Appendix A of this document).
For example, every facility has some type of office operations to manage the purchase of materials,
personnel, and other administrative tasks. Opportunities that can be implemented in any office include:
• Reducing lighting levels in certain areas,
• Using energy efficient bulbs and fixtures,
• Retrofitting plumbing with water saving devices
• Using electronic documents and mail, and
• Making double-sided copies.
While these opportunities will be common to many industries there will always be opportunities that are
specific to a particular facility and it's operations. The assessment team should explore other opportunities
that fit a facility's unique needs. This chapter of the document gives a description of each operation area,
the types of wastes generated from each operation, and potential pollution prevention opportunities.
E.5 Energy Consuming Equipment
Industrial operations are very energy intensive. Equipment can be combined into a multitude of
applications. There are common types of equipment used across industries such as boilers, air compressors,
and lighting. There are many energy conservation opportunities that can be implemented for these types of
equipment independent of application. Following are brief descriptions of common types of equipment used
in industry and applicable energy conservation opportunities. Several energy conservation case studies are
given in the appendices of this document.
E.5.1 Electric Equipment
Motors represent the largest single use of electricity in most facilities. The function of an electric
motor is to convert electrical energy into mechanical energy. Motors are designed to perform this function
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Executive Summary
JT , efficiently; the opportunity for energy savings with motors rests primarily in selection and use. The most
direct power savings can be obtained by shutting off idling motors, eliminating no-load losses.
Often motors have a greater rating than required, operating at partial load. Reasons for oversized
motors include:
• Personnel may not know the actual load; and to be conservative, select a motor larger than
necessary.
• The designer or supplier wants to ensure that the unit will have ample power.
• The correct motor rating is not available when a replacement is needed.
Newer technologies have made motors more efficient and allow flexibility in motor loads such as
reduce speed/variable drives and variable frequency AC motors.
Many lighting systems that represented good practice in the past are inefficient in view of today's
higher electrical costs. A lighting conservation program not only saves energy but is a highly visible
indication of management's interest in conserving energy in general. The importance of lighting
conservation, therefore, should be considered not only for its dollar savings but also for its psychological
effect on the facility's entire conservation program. Opportunities for conservation include:
• Using task specific lighting levels,
• Turning off unneeded lighting,
• Using lighting specifically designed for high ceiling area, and
• Using energy efficient lamps.
E.5.2 Heat
Boilers are common throughout industry to provide steam for applications as well as heat. A boiler
system is comprised of four main parts: a boiler, a steam distribution system, steam traps and a condensate
return system. There are several factors that can impact a boiler's efficiency. These include adjustment of
air/fuel ratio for fuel combustion, make-up water pre-heat, frequency and amount of blowdown to clean the
system of excess solids, percentage of condensate return, and maintenance of the system for leaks and proper
operation. Many opportunities for increasing efficiency can be realized through simple maintenance of the
system through cleaning, repair of leaks, and periodic adjustment of the air/fuel ratio for combustion.
Heating systems are an integral part of industry today. They are used for process heating, drying and
comfort/space heating. The main purpose of industrial space heating is to provide a comfortable work
environment for its employees. Destratification fans are used to push warm air that has risen to the ceiling
back down to personnel level. This allows the air to mix and reduces the heating requirements for the facility.
Stratification is a result of an increasing air temperature gradient between the floor and the ceiling in an
enclosed area. Destratification fans can also be used to increase air circulation and cooling during the
summer months.
Electric heating equipment is often in expensive and convenient to install. While electrical heating
is efficient, the cost of electricity is significantly higher than other sources of energy such as steam or natural
gas. Opportunities for increased energy efficiency can be realized by applying the correct type of heating for
the application. For example, radiant heating systems are ideal for comfort heating since the infrared
radiation elevates body temperature without heating the air through which it travels.
Furnaces are used to generate heat for application directly to a product for tempering, curing
coatings, or drying. Furnaces can use electricity or a fossil fuel to generate heat. Opportunities for
conservation in furnace operations include adjustment of combustion efficiency, installation of better
insulation, improved product cycling, preheating of combustion air, and installation of furnace covers.
Cogeneration is the simultaneous production of electric power and use of thermal energy from a
common fuel source. Interest in cogeneration derives from its inherent thermodynamic efficiency. Fossil
fuel-fired central stations convert only about one-third of their energy input to electricity and reject two-thirds
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Executive Summary
in the form of thermal discharges to the atmosphere. Industrial plants with cogeneration facilities can use
the rejected steam in their plant process and thereby achieve a thermal efficiency as high as 80 percent.
Thermoenergy storage systems are used to take advantage of lower cost electrical rates with
nighttime operation to provide daytime thermal needs. There must be a significant difference between night
and daytime electrical costs, and the daytime refrigeration load must result in high daytime costs in order for
this system to be economically feasible.
E.5.3 Prime Movers of Energy
Pumps are widely used for the transfer of liquids from one place to another. Pumps are usually
driven by electrical motors but can also be driven by compressed air or hydraulics. There are many types of
pumps in use in industry and will vary depending on the application. A few types include:
• Centrifugal pumps used for transfer of large volumes;
• Metering pumps used for precise delivery of liquids to a point of application and ensuring the
constant discharge regardless of back-pressure in the lines; and
• Progressive cavity pumps or peristaltic pumps used for delivery of very viscous materials.
Opportunities for energy savings in pump operation are overlooked because pump inefficiency is not readily
apparent. These measures can improve pump efficiency:
• Shut down of unnecessary pumps,
• Restore internal clearances if performance has changed significantly,
• Trim or change impellers if head is larger than necessary,
• Control by throttle instead of running wide open or bypassing the flow,
• Replace oversized pumps,
• Use multiple pumps instead of one large pump, and
• Use a small booster pump.
Fans provide the necessary energy input to pump air from one location to another while they
overcome the resistance created by equipment and the duct distribution system. Factors that can reduce fan
efficiency are: excessive static-pressure losses through poor duct configuration or plugging, duct leakage,
improperly installed inlet cone causing excessive air recirculation, oversized fan, and buildup of negative
pressure. Reductions in exhaust airflows are usually obtained by adjustment of dampers in the duct. More
efficient methods of volume control that can be used are to install inlet damper control, reduce the speed of
the fan, and provide variable speed control for the fan.
Air compressors are often large consumers of electricity. There are two types of air compressors:
reciprocating and screw compressors. Reciprocating compressors operate in a manner similar to that of an
automobile engine, using a piston to compress the air. Screw compressors work by entraining the air
between two rotating augers. The space between the augers becomes smaller as the air moves toward the
outlet, thereby compressing the air. Screw type compressors, especially older models, use more energy than
reciprocating compressors. This is especially true if the compressor is over sized because the screw
compressor continues to rotate, whereas a reciprocating compressor requires no power during the unloaded
state. There are many opportunities to reduce the amount of energy used by air compressors including:
• Repairing air leaks;
• Reducing the operating pressure;
• Recovering heat from compressor exhaust or cooling water;
• Using outside air; and
• Installing low-pressure blowers where applicable.
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Notes E.5.4 Thermal Applications
The most common types of cooling towers dissipate heat by evaporation of water that is trickling
from different levels of the tower. Cooling towers conserve water, prevent discharge of heated water into
natural streams and avoid treating large amounts of make-up water. Opportunities for energy reduction in
cooling tower operations include adjustment of condenser water temperature, adjustment of chilled water
supply temperature, installation of variable speed motors for cooling tower fans, and use of hot gas defrost for
air cooler coils.
Absorption and mechanical chillers are used to produce chilled liquid for air conditioning and
industrial refrigeration processes. These chillers are usually powered by low-pressure steam or hot water,
which can be supplied by the plant boiler or by waste heat from a process. When prime energy is needed,
mechanical refrigeration is usually preferable. Air leakage can be a serious operating problem for absorption
chillers. Every effort must be made to keep the system airtight, as even very small leaks can cause problems
and are difficult to detect. Air entering the machine causes the lithium bromide solution to become highly
corrosive to metals, to crystallize, and causes the chilled water temperature to increase.
For mechanical chillers, greater energy efficiency can be achieved through the following steps:
1. Use refrigeration efficiently.
2. Operate at the lowest possible condenser temperature/pressure.
3. Operate at the highest possible evaporator temperature/pressure.
4. Operate multiple compressors economically.
5. Recover heat rejected in the condenser.
6. Use a hot gas bypass only when necessary.
Insulation is an important component in thermal applications to increase the efficient use of
conditioned fluids and gases. Proper insulation allows the conditioned fluid or gas to retain its temperature or
pressure longer and reduce losses in transportation to the point of use. For example, insulation of steam and
hot water pipes reduces the heat loss prior to its intended use. Insulation is also an important consideration
for other items such as heated tanks, refrigeration units, and general building insulation.
E.5.5 HVAC
Employee comfort as well as a healthful working environment E an important consideration for
facility managers. A controlled working environment is also important for equipment or processes that are
sensitive to temperature and humidity. Air conditioning is the process of treating air to control its
temperature, humidity, cleanliness, and distribution to meet the given requirements. The basic components
include a fan to move air; coils to heat an/or cool the air; filters to clean the air; humidifiers to add moisture;
controls to maintain the specified conditions automatically; and a distribution system. Potential energy
conservation can be realized from air conditioning operations by operating the system only when needed;
eliminating over cooling and over heating;, eliminating reheat; minimizing amounts of makeup and exhaust
air; minimizing the amount of air delivered to conditioned spaces; recovering energy, and maintaining
equipment.
HVAC systems are typically used for conditioning of space for human comfort. Employee comfort
has a great influence on productivity. However, all the comfort should be provided at the minimum expense.
Factors that should be considered when controlling the HVAC settings include activities to be performed
within the space and the types of clothing typically worn. There are several types of HVAC systems
available today. The assessment team should base any recommended opportunities on the type of system
installed at the facility.
Many operations require ventilation to control the level of dust, gases, fumes, or vapors. Excess
ventilation for this purpose can significantly add to the heating and/or cooling load. Areas that require
significant amounts of ventilation are not always cooled but will in most cases be heated. A common
problem during the heating season is negative building pressure resulting from attempting to exhaust more air
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than can be supplied. A facility can minimize the impact of ventilation during winter months by balancing
airflow and recovering heat for reuse.
E.6 References and Resources
This guide is intended to be a starting point for those interested in increasing a facility's efficient
use of materials and energy. References used in compilation of this document are listed for more in-depth
information. Industry specific guides available from the U.S. EPA and other sources are also listed.
There are many agencies and organizations that are available to provide assistance to industrial and
commercial facilities in the areas of energy conservation and pollution prevention. The agencies and
organizations are presented by type (i.e., Federal, state, university, or non-profit). Information for web sites
and email addresses are given when available.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Executive Summary
Notes
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10 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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CHAPTER 1. INTRODUCTION
Notes
This document is intended to provide guidance to those who are interested in performing industrial
assessments at industrial or commercial facilities. This document is not intended to be an all-encompassing
guide to industrial assessments but a general reference for performing industrial assessments. This
document was not intended to re-invent the wheel and therefore is a compilation of information gathered
from various sources. The U.S. EPA would like to acknowledge and thank those who have performed the
case study assessments. In addition, the U.S. EPA would like to thank Dr. Michael Muller and staff of The
Office of Industrial Productivity & Energy Assessment, Rutgers University, for their efforts in producing the
first version of this document.
1.1 Document Organization
This guide is organized in four basic sections: Basic
Concepts, Specific Waste Generation Information, and Specific
Energy Consumption Information, and References and Case
Studies. Basic Concepts, Chapters 1-4, is comprised of assessment
methodology, fundamentals of an assessment, and evaluation of
pollution prevention and energy conservation opportunities.
Specific Waste Generation Information, Chapter 5, will cover
industrial operations, waste generated from each operation, and
pollution prevention opportunities. Specific Energy Consumption
Information, Chapters 6-10, covers different types of energy
consuming equipment including: electrical equipment, heat
generating equipment like boilers and furnaces, prime movers of
energy, thermal applications, and HVAC. References and Case
Studies, Appendices A-F, include materials that would be used
again and again even after the basic concepts have been mastered
such as references, sources of information, and pollution prevention
and energy conservation case studies.
1.2 What Is An Industrial Assessment
An industrial assessment is an in-depth review of existing
operations to increase efficiency of the operation through pollution
prevention and energy conservation. The industrial assessment is
an essential and valuable tool used to: (1) define the specific
characteristics of a whole facility or operation that consumes
energy and generates wastes, (2) identify a range of energy
conservation and pollution prevention options, (3) evaluate the
options based on a set of criteria, and (4) select the most promising
options for implementation. An industrial assessment is also an
integral component of a facility's Pollution Prevention Program as
described below.
Facilities should find the industrial assessment instrumental to systematically identifying
opportunities to increase energy efficiency and decrease waste generation. It is a well used and proven
approach to identifying cost saving energy conservation and pollution prevention technologies that enhance
a facility's performance.
1.3 Benefits of An Industrial Assessment
Energy conservation and pollution prevention opportunities provide many benefits. An industrial
assessment is intended to increase the efficient use of energy and materials. The process of performing an
Document Organization
Basic Concepts - Chapters 1-4
• Introduction
• Assessment Fundamentals
• Evaluation of Pollution
Prevention and Energy
Conservation Opportunities
• Sources of Energy and Pollution
Waste Generation - Chapter 5
• Industrial Operations
• Waste Generation
• Pollution Prevention
Opportunities
Energy Consumption - Chapters 6-10
• Electric Equipment
• Heat
• Prime Movers of Energy
• Thermal Applications
• HVAC
Appendices & References
• Sources of Information
• Energy Calculations
• Equipment
• Definitions
• Energy Conservation Case
Studies
• Pollution Prevention Case
Studies
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
11
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Introduction
Notes
Benefits of Industrial Assessments
• Economics
• Reduced energy consumption
• Reduced waste generation
• Increase operation efficiency
• Reduced liability
• Reduced compliance issues
• Increased worker health and
safety
• Improved public relations and
public image
• Better monitoring of operation
performance
assessment provides useful information for facility personnel to
evaluate a particular operation or the entire facility. Benefits
resulting from industrial assessments include economics and
compliance with regulations.
One of the biggest motivators for implementing either
energy conservation or pollution prevention measures is
economics. While economics should not be the only factor
considered when evaluating an opportunity for pollution prevention
or energy conservation, it is by far one of the most influential
factors for getting an opportunity implemented. Economic
evaluations of opportunities should incorporate costs for labor,
energy (electricity, natural gas, fuel oil, etc.), waste disposal,
shipping and transportation. There will be other intangible factors
that a cost cannot be applied to such as improved worker health and
safety, improved public relations, and reduced liability for waste
disposal. Additional economic benefits include increased operation
efficiency and better monitoring of operation performance. While
estimates of benefits resulting from these factors can be made, a
facility should always measure the actual savings or cost versus the
estimate. Economic evaluation of pollution prevention and energy conservation opportunities will be
discussed in greater detail in Chapter 3.
Reduced energy consumption presents direct economic benefit to a facility through reduced energy
costs for electricity, natural gas, fuel oil, etc. This economic benefit can be realized as a result of installing
new energy efficient equipment, scheduling of facility operations to reduce charges from utility companies,
and best management practices. Energy conservation does not always provide a direct benefit to the facility
in terms of reduction of pollution but does provide indirect reductions to pollution generation at the energy
generation facility. Pollution prevention opportunities also provide direct economic benefit to a facility
through reduced waste generation, reduced labor to manage wastes, raw material purchases, and other
unquantifiable benefits such as reduced liability for waste disposal and improved worker health and safety. In
addition, a facility can improve compliance with OSHA and environmental regulations through best
management practices as well as improve public relations. With increased public awareness of environmental
issues, improved public relations and public image are increasingly appealing benefits.
1.4 Who Should Participate In An Industrial Assessment
Any facility that wishes to find opportunities to increase the efficiency of their operation should
participate in an industrial assessment. Businesses have strong incentives to increase operation efficiency as
this increases their competitive edge. Operations that are more efficient can operate with lower expenses and
decrease their cost per unit production. An industrial assessment is not something that is performed only
once and projects are implemented. Industrial assessments should be used as a tool to periodically examine
operation efficiency and re-evaluate current opportunities. As new technologies become available, an
opportunity that was not economically or perhaps technically feasible when the last industrial assessment was
performed can become a viable opportunity for a facility.
The industrial assessment can be performed either by facility personnel or can be done by an
industrial assessment expert. There are many universities and private firms that provide these services to
industrial facilities. For a list of additional resources available see Appendix A.
1.5 Establishing a Pollution Prevention Program
An effective pollution prevention program is the key to reducing environmental impacts from an
industrial facility. An industrial assessment alone cannot provide continued improvements to a facility with
out planning and organization. A lack of planning and organization can lead to a low performance and higher
cost to implement pollution prevention and energy conservation opportunities. Facilities can avoid this by
12
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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establishing a pollution prevention program. A program is simply an organized, comprehensive, and ^ .
continual effort to systematically reduce or eliminate pollution and wastes.
There are four basic elements of a pollution prevention program.
1. Management Support
2. Characterization of Energy Usage and Waste Generation
3. Conducting Industrial Assessments
4. Review of Effectiveness
These elements provide the framework to obtaining effective results from industrial assessment efforts.
1.5.1 Management Support
A successful pollution prevention program begins with management support. Visible management
support is important to ensure that employees understand that pollution prevention is a priority. This
commitment can be demonstrated using several techniques including:
1. Written comp any policy,
2. Setting goals for reducing energy consumption and waste reductions,
3. Designating program coordinators or a working group,
4. Publicizing and rewarding successes, and
5. Providing employee training.
Goals should be developed to identify specific reductions and accomplishments for a pollution
prevention program. By setting goals, the nature of the pollution prevention program will be defined and
efforts will be directed toward a quantifiable objective. Once the goals are publicized, employees will know
what the program is trying to accomplish and why they should participate. All published goals should set
time limits, numeric goals, measurement units, and a mechanism to track progress. Setting pollution
prevention goals, and tracking progress towards that goal, helps build a sense of accomplishment and
reaffirms the reasons for implementing pollution prevention programs to facility personnel. In addition,
setting goals will also help determine which pollution prevention projects should get priority and funding.
Program coordinators or a working group should be established to implement the pollution
prevention program. Members should include representatives from each major affected group and include
supervisors and shop level employees. The staff is not necessarily static; different personnel may be needed
as the pollution prevention program progresses from the planning stages to implementation. Staff
responsible for implementing pollution prevention options should be involved in the planning process.
The coordinators will be responsible for developing the pollution prevention plan, encouraging
staff participation in the planning and implementation of the program, monitoring the program as it
develops, acting as advocates for the pollution prevention program, and publicizing the program.
Group members can promote the pollution prevention program throughout the facility and generate
moral support. They can educate personnel about what is being done and why. They can solicit ideas from
the shop floor and suggest them at the next meeting. A pollution prevention newsletter giving periodic
updates on the progress of certain projects can be started with group members contributing articles. The
group can create incentives for employee participation or give awards for pollution prevention suggestions
from employees.
1.5.2 Characterize Energy Usage and Waste Generation
In order to determine how well the facility's program and projects are being implemented, the
facility should develop mechanisms to track measures of performance. These measures of performance
should include the quantity and cost of utilities and waste generated as well as hazardous constituents.
Measures of performance can be used to determine the true costs associated with energy and waste
management including regulatory oversight compliance, paperwork, materials in waste stream, and loss of
production potential.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 13
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Introduction
JT , The data elements identified and discussed below are some examples of information that could be
regularly compiled (if applicable) and reviewed by the environmental office or an appointed environmental
head. For each of these components, large uses should be identified and improved upon.
• Toxic Release Inventory (TRI) Releases - track the usage of TRI chemicals to provide data for
identifying reduction opportunities. Material substitution and process changes can reduce TRI
chemical usage.
• Hazardous Waste Generation - track and record hazardous waste generation for each group/process
within the facility. The group's progress toward hazardous waste reduction should be reported.
• Non-Hazardous Solid Waste - track and record waste generation for each group within the facility.
The group's progress towards reducing the amount of municipal solid waste generated should be
reported.
• Alternative-Fueled Vehicles - document and promote use of alternatively fueled vehicles.
• Pesticide Management - track pesticide management practices. The information can be utilized to
produce a baseline for a goal of pesticide reduction.
• Ozone Depleting Chemicals - track the purchase and usage of ozone depleting chemicals. A formal
reduction plan can be formulated to eliminate the use of all ozone depleting substances.
• EPA 17 Industrial Toxics - tracking can identifying high volume uses of EPA 17 industrial toxics,
and pollution prevention opportunity assessments can be conducted specifically targeting those
products/chemicals.
• Affirmative Procurement - track procurement of materials, including the amounts of recycled
content products purchased by the facility. To do this, office personnel can utilize the EPA
Affirmative Procurement Guideline Items to identify particular products.
• Energy Conservation - track energy consumption sources (e.g., #2 and #6 fuel oil, natural gas,
propane, electricity). This information should be utilized to track progress toward pollution
prevention goals.
• Water Conservation - track water usage on a monthly basis to gauge progress toward pollution
prevention goals. Water use data should be distributed to all involved groups.
1.5.3 Conduct Industrial Assessments
An industrial assessment is the tool used to systemically identify opportunities for energy
conservation and pollution prevention. Facilities should periodically conduct assessments to identify
opportunities for implementation not just one time. New technologies are being developed every day and
becoming more economical to implement. Opportunities that were once not technically or economically
feasible for implementation may become feasible two or three years later. Industrial assessments should be
used as a tool to accomplish the pollution prevention goals.
1.5.4 Review Program Effectiveness
Periodic reviews of pollution prevention program goals and objectives as well as results from
implemented projects are vital to obtaining continuous process efficiency. Managers as well as program
coordinators should review goals to determine if goals and objectives are being reached. Results from
implemented projects will help determine if the program is progressing toward the desired goals and identify
areas for improvement.
Many guidance documents on establishing a pollution prevention program are available from the
U.S. EPA, and many state environmental offices, as well as other organizations. This document provides
only a brief overview of pollution prevention programs.
REFERENCES
1. Federal Facility Pollution Prevention: Tools for Compliance; 1994, U.S. Environmental Protection
Agency. Office of Research and Development, Cincinnati, OH 45268. EPA/600/R-94/154.
14 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
CHAPTER 2. ENERGY AND POLLUTION PREVENTION
ASSESSMENTS
The assessment process begins with the recognition for the need for pollution prevention and
energy conservation. Facility personnel have many pieces of information available to them to evaluate
operations. The assessment is a tool to systematically evaluate an operation using available information.
This chapter will discuss general pollution prevention and energy conservation concepts, assessment
methodology, as well as basic concepts and organization in conducting an industrial assessment.
2.1 Pollution Prevention and Energy Conservation
Pollution Prevention means "source reduction" as defined under the Pollution Prevention Act, and
other practices that reduce or eliminate the creation of pollutants. It involves the judicious use of resources
through source reduction, energy efficiency, reuse of input materials during production, and reduced water
consumption. Pollution prevention does not include off-site recycling or waste treatment such as
detoxification, incineration, decomposition, stabilization, and solidification or encapsulation, concentrating
hazardous or toxic constituents to reduce volume, diluting constituents to reduce hazard or toxicity, or
transferring hazardous or toxic constituents from one environmental medium to another.
Energy conservation and pollution prevention are complementary activities. That is, actions that
conserve energy reduce the quantity of wastes produced by energy-generating processes, and actions that
reduce production wastes lower the expenditure of energy for waste handling and treatment.
2.1.1 Hierarchy
Pollution Prevention Act of 1990 reinforces the U.S. EPA's Environmental Management Hierarchy
as illustrated in Exhibit 2.1. The highest priorities are assigned to preventing pollution through source
reduction and reuse, or closed-loop recycling. Source reduction is any practice which
• Reduces the amount of any hazardous substance, pollutant, or contaminant entering any waste
stream or otherwise released into the environment (including fugitive emissions) prior to recycling,
treatment, or disposal; and
• Reduces the hazards to public health and the environment associated with the release of such
substances, pollutants, or contaminants. The term includes equipment or technology modifications,
process or procedure modifications, reformulation or redesign or products, substitutions of raw
materials, and improvements in housekeeping, maintenance, training, or inventory control.
Preventing or recycling at the source eliminates the need for off-site recycling or treatment and
disposal. Elimination of pollutants at the source is typically less expensive than collecting, treating, and
disposing of wastes. It also presents less risk to workers, the community, and the environment.
Also included in source reduction is energy conservation. Implementation of energy conservation
reduces pollutants generated as a result of energy use. For example, a facility has a boiler to produce steam
for operations. The steam pipes running throughout the facility are not insulated, therefore, more natural gas
is needed to keep the steam at the needed temperature. Insulation of the steam pipes would help to keep the
steam at the desired temperature for longer periods of time. This reduces the quantity of natural gas used to
generate steam (energy conservation) and reduces the air pollutants generated from the burning of the
natural gas in the boiler.
Recycling is also pollution prevention because this employs the reuse or reclamation of materials at
the facility for reuse in the process. An example of this would be reuse of excess plastic from trimming
operations in molding and extruding process. The excess plastic can be ground into chips and added back
into the raw materials for the molding and extruding process. Another example would be the reclamation of
solvents using a solvent distillation operation and reusing the solvents in the manufacturing operation.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 15
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Energy and Pollution Prevention Assessments
Notes
Exhibit 2.1: Environmental Management Hierarchy
Method
Example Activities
Example Applications
Source Reduction
•Environmentally Friendly
Design of New Products
•Product Changes
•Source Elimination
•Energy Conservation
Recycling
•Reuse
•Reclamation
Disposal
•Disposal at a
Permitted Facility
•Modify Product to
Avoid Solvent Use
•Modify Product to
Extend Coating Life
•Install Sensors to Turn
Off Lights When
Rooms Unoccupied
•Solvent Recycling
•Metal Recovery From
a Spent Plating Bath
•Volatile Organic
Recovery
Treatment
^
w
•Stabilization
•Neutralization
•Precipitation
•Evaporation
•Incineration
•Scrubbing
W
•Thermal Destruction of
Organic Solvent
•Precipitation of Heavy
Metal From a Spent
Plating Bath
•Land Disposal
•Deep Well Injection
2.2 Assessment Methodology
An industrial assessment consists of four general phases:
1. Planning and Organization
2. Assessment Phase
3. Feasibility Analysis Phase
4. Implementation
This document will focus on phases 1-3 and will briefly discuss phase 4.
The procedures discussed in Phases 1-3 tend to be common to many types of facilities.
Implementation procedures for projects will vary from facility to facility and as such will not be covered in
depth here. Before an assessment can begin one must determine the type of assessment to be performed.
16
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
Exhibit 2.2: Assessment Procedures
The recognized need to conserve energy and
prevent pollution.
Planning and Organization
Organize assessment team
Management commitment
Define objectives and targets
Assessment Phase
Collect process and facility data
Review data and inspect site
Generate options
Screen and select options for
further study
Feasibility Analysis Phase
Technical evaluation
Economic evaluation
Select options for implementation
Select new
assessment
targets and
reevaluate
previous
options
Industrial assessments are an in-depth
review of existing operations to increase efficiency
of the operation through pollution prevention and
energy conservation. Assessments can be divided
into three types: energy, waste (hazardous and non-
hazardous) or a combination of the two. It is very
important to remember that the goal of an industrial
assessment is increased operation efficiency and
that the assessments are not focused on
environmental or safety compliance issues although
improved compliance can be a benefit of the
assessment. If a facility has particular issues it
would like to resolve, the Assessment Team can
choose to focus on that particular area. For
example, a facility has had increasing waste
generation from its operations. The Team can focus
on the operations that are generating wastes with
the end goal to reduce the pollution generated.
Another example would be if a facility is having
problems with electricity demand charges and the
Assessment Team chooses to focus on energy
consuming operations with the end goal to reduce
the electrical charges.
Industrial assessments vary from facility to
facility depending on the types of operations
conducted. The assessment process will be the
same for each facility but will vary in the details.
This section will describe the basic concepts and
organization of an industrial assessment. An
example illustrating the concepts presented in this
chapter is given in Section 2.3.
2.2.1 Planning and Organization
The industrial assessment requires planning and organization. This phase includes assemble of the
Assessment Team, obtaining management commitment, and defining objectives and targets for the
assessment.
The first step in conducting an industrial assessment is to assemble the Assessment Team. An
industrial assessment is the examination of the entire operation and as such should include personnel from
many areas of the facility. The size of the Team will vary on the size and complexity of the operation or
process selected to assess. In addition, the composition of the Team may vary if the assessment is being
performed in-house or is being conducted by a consultant. Core team members will include those that are
involved with the operation or process, both supervisors and staff (e.g., line workers) as well as energy
management and environmental staff. Other areas of expertise you may consider to augment the core
Assessment Team include the following.
Implementation
Justify project and obtain funding
Install equipment
Implement procedure
Evaluate performance
f
Repeat the
process
Successfully implemented pollution
prevention and energy projects.
• Health and Safety
• Facilities or Civil Engineering
• Accounting and Finance
• Purchasing and Contracting
Quality Control
Legal
Each member of the Assessment Team provides key pieces of information necessary to get the
entire picture of the operation. It is important to keep in mind that you want to look at the operation from all
aspects and that the assessment is meant to provide constructive criticism to improve the entire operation.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
17
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Energy and Pollution Prevention Assessments
JT , Once the Assessment Team is established, you will need to meet to discuss the assessment strategy
prior to the assessment. The Team should determine:
• What processes will be assessed.
• Who will be involved with the assessment (i.e., Team members and shop staff).
• When will the assessment occur.
• How will the Team approach the assessment.
An important part of planning is piecing together knowledge about the selected process to begin
building an understanding of what may be involved in the assessment phase. Team members should
contribute what they know about the process, especially those who work directly with the process. The Team
should also obtain pollution prevention case studies, model shop descriptions, and other resources that can
provide pollution prevention ideas for processes that are similar to the one being assessed.
The Team should decide on a data collection format for the assessment. The format can be a
standard format, such as the worksheets provided in EPA's Facility Pollution Prevention Guide (EPA/600/R-
92/088). Alternatively, the Team may want to develop their own assessment worksheets, questionnaires, or
checklists that may be used to collect data and observations during the site visit. Examples of types of
information to collect in worksheets, questionnaires, or checklists include the following items.
• Process descriptions/flow diagrams • General questions/observations
• Energy consumption - Material handling techniques
• Input materials - Storage procedures
• Waste streams - Housekeeping
- Air • Process specific questions/observations
- Water - Developed for the individual process
- Hazardous waste • List of major energy consuming and waste
generating equipment
Solid waste
The Team should prepare an assessment agenda and schedule the assessment in advance to coincide
with a particular operation of interest. Depending on the operation, multiple walk-throughs may need to be
scheduled, particularly if there are several shifts. The Team may also want to conduct a pre-assessment
whereby Team members begin collecting preliminary information about the process, such as process
descriptions and flow diagrams.
2.2.2 Assessment Phase
The second phase is the assessment phase. This phase is broken in to two parts: pre-assessment and
assessment.
2.2.2.1 Pre-Assessment Activities
It is a good idea to obtain information prior to the assessment. This will allow the Team to study the
information and prepare additional questions. This part of the assessment is called pre-assessment activities.
Pre-assessment data collection should include general information about the facility. This
information should include a facility description, a process description, a process flow diagram, and energy
and waste data collection. The Assessment Team should collect data for a twelve-month period. Utility costs,
raw material and waste generation data should be for the same 12-month period. The Team should be
cautious about collecting data that is not necessary to complete the assessment. At this point, the Team
should collect basic information that will give them the big picture and collect other information as necessary
to complete opportunity analysis.
18 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
Facility Description
A facility description should include the following basic items: point of contact (if applicable),
annual business volume, annual business sales, the number of employees, previous energy conservation and
pollution prevention efforts, operational schedule, and general characteristics of plant facilities. This
information will provide scale of operation and comparison for energy consumption and waste generation
versus production. In addition, a general layout of the facility is helpful to provide orientation and scale of
facility operations. A simplified drawing of the facility is helpful in determining measurements and
logistical aspects of potential opportunities. An example facility description and facility layout is provided
in Section 2.3.
Process Description
The process description is a very important part of the information collection process as it will
provide the basic information needed to generate process flow diagrams and for opportunity analysis. A
process description should include the following elements:
• Description of the products produced (i.e., tooth brushes, decals, blue jeans),
• Description or brief list of raw materials,
• Step-by-step description of unit operations from the beginning of the product manufacture
following through to the finished product, and
• Notations of any energy consuming equipment ratings (i.e., ovens at SOOT, steam at 75 psi) and
wastes generated (these can be made in the description or can be noted on the flow diagram).
Process Flow Diagram
Developing a flow diagram from scratch may require team members to discuss the process with the
supervisor along with multiple members of the staff. The Team will need to visually observe the process
and obtain an adequately detailed description of each step in the process in order to sketch a flow diagram.
Block flow diagrams are useful tools for the assessment. A model block diagram is provided below in
Exhibit 2.3.
Exhibit 2.3: Block Diagram Model
Energy Input Other Process Inputs
(Water, Air, Etc.)
Raw Material Inputs
Raw Material Inputs
Raw Material Inputs
I 1
Process
n
• Product
• Co-Product
" Co-Product
Air Solid Hazardous Water
Emissions Waste Waste Emissions
A flow diagram is simply a series of block diagrams that visually describe the process or flow of
materials. For each block in the flow diagram, the Team should obtain data including raw material input,
waste stream output, utilities, products, and co-products. All data should be based on the same time unit,
e.g. annual, quarterly, or monthly. At a minimum, the Team should collect the data elements above.
In addition to the basic raw material and waste stream information described above, you should
note other information pertinent to the assessment. For example, you should identify the following.
• Co-products that are recycled back into the process.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 19
Notes
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Energy and Pollution Prevention Assessments
• Pollution control devices.
• Routine and non-routine input materials and waste streams.
• Environmental fate of waste stream (e.g., landfill, recycle, hazardous waste, etc.).
• Temperature settings of any operation that requires heat or cooling.
• Pressure settings for compressed air and requirements at the point of use.
• Pressure requirements for steam and actual steam generation pressure.
Example flow diagrams are given in Section 2.3. These diagrams should follow the process
description and will visually illustrate the flow of materials and energy usage for specific operations. These
diagrams can be used to determine where energy is being consumed and wastes are being generated.
Energy and Waste Data Collection
Information obtained prior to the assessment can become a springboard in the determination of
possible energy conservation and pollution prevention opportunities. Collecting this information prior to the
actual assessment allows the Team to analyze, graph, and review the information and generate more
questions.
Information to collect prior to the visit includes raw materials, waste streams and environmental
releases, and utility information. The Team should limit this information collection phase to only information
that will be necessary for the assessment. If the Team has chosen to focus on a specific operation or on
energy conservation, only information for those areas should be collected.
Raw Materials
• Weight and/or volume of procured raw materials, along with purchase costs.
• Inventory practices.
Waste Streams and Environmental Releases
• Volume and characteristics of hazardous wastes generated, waste management and disposal costs.
• Volume and characteristics of air emi ssions and waste management costs.
• Volume and characteristics of wastewater discharges and management costs.
• Other releases and environmental impacts.
Utilities
• Utility consumption and costs.
• Maintenance of on-site utilities (e.g., emergency generators).
Equipment and Operations
• List of major energy consuming equipment such as heaters, air conditioners, water heaters, and
specific process-related equipment
• General Operation equipment information such as cleaning tanks, solvent recovery systems, and
other equipment that have a secondary role in the main operation.
Sources of process information that the Assessment Team may refer to are:
• Permit and/or permit applications, • Operator data logs,
• Internal environmental audit reports, • Waste handling, treatment and disposal costs,
• Biennial hazardous waste reports, • Water bills,
20 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
• Material safety data sheets (MSDSs), • Electric, natural gas, and/or fuel oil bills, and
• Product composition and batch sheets, • Standard operating procedures (SOPs).
Analysis of Energy Information
The Team should collect utility usage and cost data for the previous 12-month period prior to the
assessment to allow the data to be summarized and graphed. There are three reasons for collecting energy
information prior to the assessment: (1) to determine how much energy is consumed, (2) how much it costs,
and (3) what are the trends in energy usage. Energy bills yield information that may provide
recommendations before the assessment such as energy demand rescheduling, avoidance of late payment
penalties, and energy ratcheting errors.
Once information for each energy source is collected the Team must convert the different energy
types to BTUs to allow comparison and overall trending of energy usage. Presentation and reference to this
information is usually done in a table and graphical format. Examples of energy usage information are
presented in Section 2.3.
For electric utilities; the Team should collect the following key pieces of information.
• Electricity Usage • Other Costs
• Energy Charge • Reactive Costs
• Peak Demand • Total Electric Cost
• Demand Cost • Unit Electric Cost (calculated average)
Review of electricity and other utility use will enable the Assessment Team to determine trends for
the heating season, the cooling season and possible seasonal trends in manufacturing.
The Assessment Team should collect natural gas usage information for the same 12-month period
as for other energy sources. Examination of natural gas usage can reveal the following types of potential
problems.
• Leaking Fuel Lines
• Faulty Temperature Measuring Devices
• Faulty Relief Valves
• Excessive Burner Cycling
• Warped Furnace Doors
• Deteriorating Furnace Insulation
Natural gas supplied to industrial operations is usually done on an interruptible basis. This allows
the facility to obtain lower rates for their natural gas use. Interruption of gas service is done to meet
demands for heating private homes during winter months. Facilities that have an interruptible gas supply
must maintain a back-up fuel supply such as fuel oil.
The Assessment Team should collect fuel oil usage information for the same 12-month period as
for other energy sources. In the United States three types of fuel are available. The most expensive oil is
No. 2, 138,000 Btu/gallon. A little cheaper option is No. 4, 142,000 to 145,000 Btu/gallon and the cheapest
is No 6, 149,690 Btu/gallon. It is important to keep in mind that the fuels are not interchangeable because
the combustion equipment is designed for only one type of fuel. If a facility uses more than one type of fuel
oil, the Team should make separate tables and graphs for each type of fuel.
Graphical representation of the data subsequently provides the Team the next logical step in the
energy usage analysis progression. Experience indicates that graphical summaries are easily read and
understood indicators of relative proportions. Usage patterns normalized for comparison to regional and
like industries may indicate abnormalities worthy of investigation. A graph for each energy source and a
summary graph with all energy sources should be prepared with the unit of measure for energy in BTUs
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 21
Notes
-------
Energy and Pollution Prevention Assessments
JT , versus each month. It is important when comparing different energy types to use the same unit of measure.
The type of graphs listed below will aid in trend analysis.
• Monthly Electric Usage • Monthly Itemized Electric Costs
• Monthly Natural Gas Usage • Monthly Natural Gas Costs
• Monthly Fuel Oil Costs (make separate • Monthly Total Electric Costs
graphs for multiple types of fuel oil)
• Summary Cost Graph (with all energy
• Monthly Fuel Oil Usage (make separate types)
graphs for multiple types of fuel oil)
• Summary Graph (with all energy types
Raw Material and Waste Generation Data
Prior to the actual assessment, the Team should also collect raw material and waste generation data.
Collection of this information will permit the assessment Team to become familiar with the types of materials
used in the facility and the resulting waste streams that are generated. The Team should review this data prior
to the actual assessment to begin generating additional questions. In addition to the basic raw material and
waste stream information described above, other types of information pertinent to the assessment should be
identified.
• Co-products that are recycled back into the process.
• Pollution control devices.
• Routine and non-routine input materials and waste streams.
• Environmental fate of waste stream (e.g., landfill, recycle, hazardous waste, etc.).
Raw materials can be provided in advance of the assessment in a table or can be provided in the flow
diagrams. All material information collected should be for the same 12-month period. Facility personnel will
find that collecting raw material information will be simpler using the table format and then use this
information to break raw material information down into operations for the flow diagrams.
Equipment List
Equipment used in a facility are key to determining benefits and costs from potential pollution
prevention and energy conservation opportunities. Prior to the assessment the Team should try to obtain
information about major pieces of equipment. Information to collect about equipment will vary with the type
of equipment. Chapter 5 describes industrial operations common in many types of facilities. Chapters 6-10
describe types of energy consuming equipment. Review of these chapters will provide a general
understanding of common operations and equipment. This will provide some insight into what types of
information are needed to evaluate a particular opportunity. Information to collect for various pieces of
equipment includes the following.
• Equipment Rating • What are the operation requirements?
• Average Load • At what pressure does the system generate steam or
compressed air?
• Energy Source
• How much liquid does the tank typically contain?
• Hours of Operation
• What is the equipment used for?
• How big is the tank?
At a minimum the Team should make a list of major pieces of equipment and collect specifics as needed for
opportunity evaluation.
2.2.2.2 Assessment
This is the most important phase of the assessment as this is the opportunity for the Team to observe
actual operations, talk with all levels of facility personnel, generate a list of possible opportunities, and collect
22 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
information to evaluate those opportunities. The assessment can be organized into the following six main
steps.
1. Kick-off Meeting
2. Discussion of Operations
3. Walk-Through of F acility Operatic n s
4. Brain Storming
5. Identify and Fill Data Gaps
6. Wrap-up Meeting to Discuss Opportunities
Kick-off Meeting
A kick-off meeting is a key element in presenting the assessment to facility personnel who will be
involved in the actual assessment but are not on the Assessment Team. This is the Team's opportunity to
present the goals of the assessment, discuss organization of the assessment, and anticipated results of the
assessment.
Discussion of Operations
Directly following the kick-off meeting, the Assessment Team should review operations with
facility personnel. This should include review of all data collected prior to the assessment, a step-by-step
verbal walk-through of the process and review of the process flow diagrams. This will allow the
Assessment Team to ask questions without straining to hear answers as they are walking through the
facility. If preferred, the Team may wish to include a brief walk-through of the facility prior to these
discussions.
Walk-Through of Facility Operations
During the walk-through, the Assessment Team should record observations about the operations
and general appearance of the facility (e.g., evidence of leaks and spills). The Team should talk to several
staff members, particularly if there are multiple shifts operating the process. The Team should take the time
to explain the purpose and importance of the assessment to each staff member before asking questions.
Team members should observe the workers performing their jobs and return to the process during different
shifts, if possible.
After making real-time observations, the Team should compare written procedures with the
observations. Written procedures will often contradict actual operations, and may indicate an energy
conservation or pollution prevention opportunity such as a need for training and education.
During the walk-through, it is important to solicit assistance and input from all levels of staff on
potential opportunities. The process operators are usually the best source of potential solutions, but may be
reluctant to speak up about their ideas. If a staff member identifies an opportunity that is implemented,
Team members should make sure that the employee is acknowledged and rewarded.
One should realize that the assessment and data gathering portion of the assessment might take
considerable time and several iterations, depending on the size and complexity of the process. The Team
should return to the process as often as necessary to gather adequate data to develop a list of opportunities.
Brain Storming
Once the data collection and process assessment is complete, the Team will need to evaluate the
data and observations collected, and begin developing a list of energy and pollution prevention
opportunities. It is important to perform this step as a team, with everyone contributing their ideas equally.
It is a good practice to allow the free flow of ideas at this point. The Team should begin
developing a list of ideas, without regard to cost or feasibility. This process is called Brain Storming. This
is the point where observations made during the walk-through are transformed into energy conservation and
pollution prevention opportunities.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 23
Notes
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Energy and Pollution Prevention Assessments
JT , If the Team is experiencing difficulty identifying pollution prevention options, the Team should try
tapping into other information sources and technical assistance. Appendix A- Sources of Information
provides a number of technical assistance resources, such as pollution prevention clearinghouses, Internet
resources, and technical support.
To begin developing a list of options, the Team should identify the most problematic areas such as
compressed air leaks, increased monitoring of boiler efficiency, large volume or highly toxic waste streams,
inconsistencies with written procedures, lack of environmental ethic, or poor housekeeping efforts.
Another method to identify energy conservation or pollution prevention opportunities is to evaluate
each energy source or waste stream individually. First, the Team should determine the cause and effect of the
waste stream by tracking the waste stream back through the process to input materials; and then identify
potential ways to reduce the waste streams. For example, if the waste stream is dry absorbent contaminated
with hydraulic oil, one may be able to back track to the cause for the usage of dry absorbent to a leaking
valve. By fixing the leaking valve, there is an opportunity to (1) reduce hazardous waste generated, and
(2) reduce the amount of hydraulic oil purchased.
One should also consider a wide range of projects. The following provides a list of potential
pollution prevention approaches that should be considered during the option generating process.
• Policy Changes • Waste Stream Segregation
• Procedural Changes • Housekeeping Practices
• Equipment Modifications • Inventory Control
• Material Substitution • Reuse of Materials
• Training • Equipment Maintenance (i.e., rep air
. compressed air, steam, and fluid leaks
• Efficiency Improvements
Identify and Fill Data Gaps
Once the list of energy conservation and pollution prevention opportunities has been generated, the
Team should review the data that has been collected. The purpose of this review is to ensure that the Team
has all the data that it needs to complete a feasibility analysis for the all the options. This would include light
or temperature measurements, counting light fixtures, etc. If any information has not been collected the Team
should, make every attempt to collect it before leaving.
Wrap-up Meeting
Finally, the Team should sit down with the process supervisor and other management personnel to
review the data collected. The Team should also discuss overall observations and general energy
conservation and pollution prevention opportunities that will be addressed in the following phases of the
assessment. Obtaining input from facility personnel at this point is key to gaining support for implementation
of opportunities.
2.2.3 Feasibility Analysis Phase
The third phase of the assessment methodology is the feasibility analysis. The feasibility analysis
phase consists of three post-assessment activities: (1) prioritization of opportunities, (2) evaluation of
technical and economic feasibility, and (3) generation of an assessment report.
2.2.3.1 Prioritization of Opportunities
Because of time and resource constraints, most facilities have to set priorities among their energy
conservation and pollution prevention options based on the original goals and criteria specific to the processes
evaluated.
A relative ranking of opportunities can be developed by using a tool known as the decision matrix.
The decision matrix tool can be used to rank the identified energy conservation and pollution prevention
opportunities using a list of critical factors that are important to the facility. The decision matrix facilitates an
24 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
"apples-to-apples" comparison of options based on the selected list of critical factors, simplifying the group
decision-making process.
Many companies have criteria for determining what projects will be implemented. For example,
many companies have requirements that payback periods for all projects must be less than 1 year. The
Team should consider common factors like payback period, cost savings, operational impact, compliance
issues (both safety and environmental), and technical feasibility. Some opportunities will be easy to apply
the criteria to, but more complex opportunities may require further analysis before a decision can be made.
To use the decision matrix, one should first assign either a numerical ranking to each of the critical
factors, such as 1-10, or general terms such as "high," "medium," or "low." This approach can also be used
if there is insufficient information for performing a quantitative ranking. In these cases, the Team should
rely on best professional judgement to assign a ranking.
The Team can also decide on appropriate weighting factors. For example, the Team may decide
that worker exposure issues are four times more important than future regulations. In this case, the Team
would multiply the results of the criteria ranking by a factor of four to give this issue increased relative
importance.
After the decision matrix ranking process is complete, you will have a ranked list of energy
conservation and pollution prevention opportunities. The top ranked opportunities deserve the most
immediate attention.
2.2.3.2 Evaluation of Technical and Economic Feasibility
Following the assessment it is necessary to evaluate the technical and economic feasibility of each
energy conservation and pollution prevention project identified. A technical evaluation should include
calculations of energy conservation or waste reduction and the associated costs, impacts on operations, and
its advantages and disadvantages. Additionally, the technical evaluation should include an evaluation of the
implementation aspects of the project including such things as: is there room in the facility for new
equipment and will the new process affect the quality of the product.
The next step is to evaluate the economic feasibility of implementing each project identified. Three
common financial performance indicators are used to determine the economic viability of energy
conservation and pollution prevention projects: Payback Period, Net Present Value (NPV), and Internal
Rate of Return (TRR) calculations. The Payback Period is the simplest of the three financial indicators and
requires the least amount of data. The Payback Period calculations are normally used as a "rough" financial
indicator in a decision matrix and for low risk projects. NPV and IRR calculations are detailed financial
indicators that require additional data to be collected about the proposed projects. Both the NPV and IRR
financial indicators are based on the time value of money over a specified period of time. Due to the
complexity and importance of performing an economic feasibility, a detailed overview and example
problem is provided in Chapter 3 "Evaluation of Energy Conservation and Pollution Prevention
Opportunities."
2.2.3.3 Generate an Assessment Report
After the prioritization and evaluation of the identified opportunities is complete, the Team should
generate a report from the data collected during the assessment and analysis of energy conservation and
pollution prevention opportunities. This report should contain the following items:
• Executive Summary with a listing of energy conservation and pollution prevention measures
recommended their estimated reduction of energy or waste, and an estimate of the payback period.
• General Facility Information as described in the pre-assessment activities above.
Process Description and Flow Diagrams
Utility information and Graphs
Raw Material and Waste Generation Listing
Equipment Listing
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
Notes
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Energy and Pollution Prevention Assessments
• Energy conservation and pollution prevention opportunity recommendations and analysis
The report should contain all the information needed to present the recommended opportunities to facility
managers for possible implementation.
2.2.4 Implementation
Management support is the single most important element in successfully implementing
opportunities from an industrial assessment. Regardless of the size or nature of the organization, top
management must exhibit active and continuing leadership and interest in the results of the assessment.
Facility employees will apply their best efforts to the opportunity only if their supervisors display a constant
awareness of energy conservation and pollution prevention. With management support, the assessment be
successfully implemented.
Actions taken to implement energy conservation and pollution prevention projects vary greatly from
project to project and company to company. Some facilities may decide to use in-house expertise to
implement projects while others may find it beneficial to contract the work to an outside organization. Either
way, it is important that the Assessment Team tracks the progress of the project and the benefits realized from
implementing them. Tracking implementation progress will prevent expensive equipment from being
purchased but never installed, and help identify opportunities where equipment or programs may be modified
to realize or improve the estimated cost and environmental savings.
After successfully implementing an energy conservation or pollution prevention project it is
beneficial to advertise the cost savings and reductions in environmental impacts. Promoting the Team's
successes will help build facility support (line operators to management) for the next project.
2.3 Example Facility Information Collection
This section illustrates the concepts presented in this Chapter using a fictitious manufacturing
facility.
Assessment Scenario
The Assessment Team will be performing an industrial assessment at a medium size screen printing
plant. Some of the products produced at the plant are truck decals and beverage dispensing machine colored
panels. This facility is approximately fifteen years old. The facility is interested in an industrial assessment
to find ways to increase operation efficiency. The aging equipment in the facility is increasing unit
production costs and making it harder for the company to compete with newer facilities. The name of the
facility will be Mars Screen Printing.
Exhibit 2.4 illustrates facility description information collected for Mars Screen Printing during a
energy and waste assessment. This information can be used to gage the size of facility operations and make
estimates for identified opportunities.
26 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
Exhibit 2.4: Example Facility Description
Company Name: Mars Printing Facility Description Information
Address: 1678 Mars St.
Anywhere, US 45609
Annual Business Volume:
20 Million feet of printed material
Production is not seasonal.
Number of Employees: 250
Employees per shift: 1st -150 7am-3pm
->nd
2-100 3pm-llpm
Energy Conservation Measures Implemented:
Installed ceiling fans in offices and break
areas
Installed occupancy sensors for lighting
Contact Person: John Smith
Contact Phone: 619-123-4567
Annual Business Sales:
Approximately $10 Million
Operational Schedule:
5 days per week, 50 weeks per year
Facility closed one week in December and
one week in July for facility maintenance.
Pollution Prevention Measures
Implemented:
None
General Facility Information:
Age of Facility: 15 yr.
Basic Construction: Concrete Block
No. of Buildings: 1
Plant Size (ft2 per building): 100,000 ft2
Exhibit 2.5 is a layout of the Mars Screen Printing plant. The layout is not in great detail but does
include general proportions of the facility and manufacturing areas. This will assist the Assessment Team
when evaluating identified opportunities.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
27
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Energy and Pollution Prevention Assessments
Notes
Exhibit 2.5: Mars Screen Printing Facility Layout
Outside
Waste
Pallet
Storage
Solvent
Vapor
Incinerator
Crate
Room
Hazardous
Waste Storage
Air Compressors
Shipping Dept.
Finishing and PVC Plastic Printing
Ink Storage
Screen
Washing
Screen
Making
Office Area
Art
Dept.
Poly-
Carbonate
Printing
Vinyl
Printing
Receiving
Cafeteria
Raw
Material
Storage
t
o
o
200 ft.
Exhibit 2.6 provides a brief process description of Mars Screen Printing operations. A process
description should include enough detail to communicate current operations and support identified
opportunities.
28
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Energy and Pollution Prevention Assessments
Exhibit 2.6: Example Process Description
Notes
Mars Screen Printing Process Description
This plant uses screen printing to produce, in several varieties and color schemes, fleet
(transportation truck) decals, beverage dispensing machine colored panels and tooth brush backings. Raw
materials include plastic sheets, rolls and spools of plastic stock, inks, adhesives, urethane and various other
chemicals and solvents related to image production and printing operations.
The printing process begins with the plant receiving a mylar sheet with a positive image, paper
copy or computer file from clients. Some artwork is done in-house. Images received on a computer disk,
and other images developed on-site, are processed in a computerized system to yield a mylar positive. The
image sheets are then transported to the screen-making department.
Screen images are produced in several steps. First, large screens are coated with a photo sensitive
emulsion in an automated system. Emulsion is applied to smaller screens manually. Coated screens are
then covered with mylar sheets containing positive images and are placed on a "burn table" which exposes
the screen to ultraviolet light for a specified period of time which hardens the emulsion through transparent
areas exposed to light. After exposure, screens are removed from the "burn table" and the uncured emulsion
is washed away with a warm water high-pressure spray.
A prepared screen is mounted horizontally on a press, and ink is troweled into an above-screen
reservoir. Ink is received in 3 to 5 gallon containers from which it is used directly or blended to customer
specified colors in an ink-mixing area. During printing, a mechanical "wipe" moves across the screen and
forces ink through porous areas onto the substrate sheets. Subsequent use of other screen images in a set
produces a multi-colored image on the sheets. After printing, the substrate is placed on a conveyor for
transport through an ink-curing oven. After curing, some of the printed substrates are coated with an
adhesive or a thin urethane film-followed by heat curing. Finished materials are inspected, packaged and
shipped to customers.
At the end of a printing run, screens are cleaned for reuse. Initially, excess ink is removed from
screens with a putty knife. Next, they are hand-wiped with sol vent-wetted paper towels while still
positioned on the press. Then the screens are removed from the presses and are transported to a screen
washing room. In this room, screens are positioned upright over a trough and dipped in ink-remover, and
occasionally a "ghost" image remover is brushed into screen material, followed by a high pressure heated
water rinse. In cases where it is not required to save a screen image, an emulsion remover is used to remove
hardened emulsion. Clean screens are allowed to air dry and are returned to storage for future use.
Exhibits 2.7-2.9 are example flow diagrams for Mars Screen Printing operations. These flow
diagrams use the block flow diagram method described in Section 2.2.2 of this chapter. These diagrams
should include pertinent information to illustrate current operations and support identified opportunities.
The Assessment Team should be cautioned to collect only information pertinent to identified opportunities
and should not try to incorporate all available information into the flow diagrams or in the process
description.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
29
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Notes
Energy and Pollution Prevention Assessments
Exhibit 2.7: Example Flow Diagram for the Mars Screen Printing, Screen Making Operation
Compressed Photo Sensitive
Mylar
20,000
Sheets/yr.
Air
20 ESI
Emulsion
30,00,0 gal/yr.
Ultraviolet
Light Tubes
100 tub
Water
20,00p gal/yr.
Apply Photo
Sensitive Coating
to Screen
Cover Coated
Screen with
Mylar Positive
Expose Screen
to Ultraviolet
Light
(5mm, 100W)
Warm
High-Pressure
Water Rinse
(80°F, 20 PSI)
. Prepared
Screen
To
Printing
Operation
Waste Emulsion
1,500 Ral./yr.
Mylar Scrap
300 Ibs./yr.
Exhibit 2.8: Example Flow Diagram for the Mars Screen Printing, Printing Operation
45% of Products
Adh
5,00
esive
Osal/yr.
Urethane
8,000sal/yr.
Application of
Adhesive or
Urethane
-*
Curing Oven
(120°F)
—
Finished
Product
Packaged
and
Shipped
to
Customer
1
Waste
Adhesive and
Urethane
200 gal/yr.
Adhesive
and
Urethane
Emissions to
Solvent
Vapor
Incinerator
5,000 gal/yr.
30
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Energy and Pollution Prevention Assessments
Exhibit 2.9: Example Flow Diagram for the Mars Screen Printing, Cleaning Operations
Prepared
Screen ^
From
Screen
Making
Remove Excess
Ink
with Putty Knife
1 1
Excess Solvent
Ink 220 Vapor
gal/yr.
Paper
Towels Solvent
500 500
rolls/yr. gal/yr.
Wipe Screen
^ with Solvent —
and Paper
Ink Remover
20,000
gal/yr.
^ Dipped in —
Ink Remover
Paper * *
Towels
with Ink
and
Solvent
1,000
Solvent
Vapor
Ghost Image Wstpr
Remover
3,000 gal/yr
Brush on
™ Ghost Image ""
Remover
Solvent
Vapor
30,000 gal/yr
High-Pressure
> 150°F
Water Rinse
1
Waste Water
30, 000
gal/yr.
-
75% of Screens
Emulsion
Remover
5,000 gal/yr.
— . Emulsion
Remover
^Screens
~"^ Air Drying to
Storage
1
J
Waste
Remover
4,500 gal/yr.
Exhibit 2.10 through Exhibit 2.12 are tables of energy consumption and cost information collected
from Mars Screen Printing. Information collected for energy usage should be collected for each energy
source for the same time period. The tabular format presented here provides a concise and uniform way to
present information for review.
Exhibit 2.10: Example Electrical Summary
Month
Jan
Feb
Mar
Apr
May
Jim
Jul
Aug
Sep
Oct
Nov
Dec
Energy
Usage
(kWh)
250,000
254,400
246,800
247,600
275,600
313,600
324,800
316,000
273,200
260,000
266,800
237,600
Energy
Charge
($)
19,185.42
19,495.87
18,979.84
16,077.64
17,937.39
20,365.63
21,582.86
21,050.37
17,943.95
17,058.38
17,440.93
18,308.30
Peak
Demand
(kW)
584.0
556.4
552.8
551.6
590.8
633.6
620.0
620.8
594.0
574.0
580.8
581.6
Demand
Cost
($)
7,965.82
7,595.74
7,530.38
4,245.78
4,617.85
4,905.38
4,919.60
4,946.63
4,632.62
4,468.58
4,466.06
7,860.44
Other
Costs
($)
215.13
214.97
213.21
194.66
201.35
209.51
216.13
214.93
201.60
198.46
199.60
212.19
Reactive
Cost
($)
110.15
116.98
111.22
113.77
114.30
116.58
112.84
116.75
108.94
110.82
112.29
108.54
Total
Elect.
Cost
($)
27,476.52
27,423.56
26,834.65
20631.85
22,870.89
25,597.10
26,831.43
26,328.68
22,887.11
21,836.24
22,218.88
26,489.47
Unit
Elect. Cost
(S/kWh)
0.078
0.077
0.077
0.065
0.065
0.065
0.066
0.067
0.066
0.066
0.065
0.077
Notes
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Energy and Pollution Prevention Assessments
Notes
Exhibit 2.11: Example Natural Gas Summary
Month
Jan
Feb
Mar
Apr
May
Jim
Jul
Aug
Sep
Oct
Nov
Dec
Energy Usage
(CCF)
10,543
8,116
1,444
756
791
558
816
2,615
7,540
12,877
18,244
19,807
Energy Usage
(MMBtu)
906.7
698.0
124.2
65.0
68.0
48.0
70.2
224.9
648.4
1,107.4
1,569.0
1,703.4
Total Cost (S)
4,979
3,838
700
376
393
283
404
1,251
3,567
6,076
8,588
9,466
Unit Cost (S/MCF)
4.72
4.73
4.85
4.97
4.97
5.07
4.95
4.78
4.73
4.72
4.71
4.78
Gas Quality - 860 Btu/cf
Exhibit 2.12: Example Fuel Oil Summary
Month
Jan
Feb
Mar
Apr
May
Jim
Jul
Aug
Sep
Oct
Nov
Dec
Usage
(gallons)
5,878
3,024
-
-
-
-
-
-
-
-
3,515
-
Usage
(MMBtu)
829
426
-
-
-
-
-
-
-
-
496
-
Cost
(S)
3,804.35
1,910.83
-
-
-
-
-
-
-
-
2,227.86
-
Unit Cost
(S/gal)
0.65
0.63
-
-
-
-
-
-
-
-
0.63
-
Tax (S)
11.38
5.72
-
-
-
-
-
-
-
-
6.66
-
Some examples of graphical representations of data collected for Mars Screen Printing Company are
presented on the following pages. Exhibits 2.13 and 2.14 are overall energy consumption and energy cost
summaries. Exhibits 2.15 and 2.16 provide a graphical illustration of electricity usage and cost. Graphical
illustration of natural gas and fuel oil usage have not bee included here but should be provided during
assessment documentation to provide a complete picture of energy usage.
32
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Energy and Pollution Prevention Assessments
Exhibit 2.13: Summary of Energy Usage
Total Energy Usage
1 °nn
I OUU
ifinn -
I OUU
-MOO _
1 onn -
I ZUU
? 1 nnn -
p- I uuu
m ann -
^ OUU
finn
DUU
Ar\r\
4UU
onn
zuu
n
.— i
r-TLn n n n
lr T-
1 -,
•
Jan Feb Mar Apr May
D Electricity • Natural Gas D Fuel Oil
PI
_
•
t
-
h
4
Jun Jul Aug Sep Oct Nov
Month
Dec
Exhibit 2.14: Summary Energy Costs
Total Energy Costs
q>o(J,(J(J(J
$25,000
(ton nnn -
w $20,000
re
— $15,000
Q
$10,000
$5,000
i-i
IT
i-i
~l n •
In
$0 iii
Jan Feb Mar Apr
D Electricity n Natural Gas D Fuel Oil
-
i-i
•-i
1
-
May Jun Jul Aug Sep Oc
Month
-
~l
-
t Nov Dec
Notes
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Energy and Pollution Prevention Assessments
Notes
Exhibit 2.15: Electrical Costs
Electricity Costs
q>zo,000
$20,000
.M O,000
1
1
1
-
^ Energy
Charge ($)
n Demand
Cost ($)
D Other Costs
($)
• Reactive
Cost ($)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Month
Exhibit 2.16: Mars Screen Printing Electricity Usage
Energy Usage (kWh)
ocn nnn -,
oou,uuu
onn nnn -
ouu,uuu
ocn nnn -
zou,uuu
onn nnn
_ zOO,000
Z •< en nnn
1 00,000
•\ nn nnn
1 UU,UUU
en nnn -
ou,uuu
0_
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Month
34
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Energy and Pollution Prevention Assessments
Raw material and waste generation information collected during an assessment should be compiled
in an easy to reference format. Exhibit 2.17 presents one format for presenting raw material information.
Raw material usage information should be collected for those materials that pertain to opportunities
identified during the assessment to avoid unnecessary information collection. This will save time and labor
for the more important task of evaluating opportunities.
Exhibit 2.17: Example Raw Material List for Mars Screen Printing
Material
Adhesive
Emulsion Remover
Ghost Image Remover
Ink - various colors
Ink Remover
Mylar
Paper Towels
Photo Sensitive Emulsion
Plastic Print Material - rolls
Plastic Print Material - sheets
Plastic Print Material - spools
Solvent
Ultraviolet Light Tubes
Urethane
Water
Volume or Weight per Year
5,000 gal
5,000 gal
3,000 gal
60,000 gal
20,000 gal
20,000 sheets
500 rolls
30,000 gal
750,000 feet
1 million feet
650,000 feet
20,500 gal
100 tubes
8,000 gal
80,000 gal
Cost per Unit or Total Cost
$6,750
$9,750
$4,800
$156,000
$28,000
$27,000
$550
$70,000 /yr.
$172,500 /yr.
$200,000 /yr.
$162,500 /yr.
$1 9,500 /yr.
$5,000 /yr.
$12,000 /yr.
$l,600/yr.
Waste generation information can be collected from several sources at the facility. Waste
generation information can be collected in the same format as raw material information. Facility personnel
will find it much easier to collect data in a table format and then to apply that information to the process
flow diagram.
Exhibit 2.18: Example Waste Generation Data for Mars Screen Printing
Material
Mylar Scrap
Waste Emulsion
Waste Water and Emulsion
Plastic Scrap
Paper Towels with Ink and Solvent
Waste Ink and Solvent
Solvent Emission
Excess Ink
Waste Emulsion Remover
Quantity
300 Ibs./yr.
l,500gal/yr.
21,100gal/yr.
400,000 feet
100 Ibs./yr.
5,000 gal/yr.
17,000 gal/yr.
220 gal/yr.
4,500 gal/yr.
Disposal Type
Landfill
Landfill
Sanitary Sewer
Landfill
Off-site Incineration
Off-site Incineration
On -site Incineration
Off-site Incineration
Landfill
Cost
$7
$2,700
$420
$100
$100
$13,600
$51,000
$600
$12,200
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
JT , The assessment team should also collect information about equipment that will be necessary to
evaluate identified opportunities. Exhibit 2.19 provides some example information collected for Mars Screen
Printing. This information will be used to calculate energy usage and waste reductions as well as cost
savings.
Exhibit 2.19: Example Equipment List and Pertinent Information
Boilers Air Compressors
• Fuel Source - Natural Gas and Fuel Oil #2 • One Screw Type Compressor-100HP
• 150BHP • One Reciprocating Compressor - 50 HP
• Steam generated at 150 PSI • Air Pressure 70 PSI
• Average Load - 75% • Used for equipment actuation
• No Condensate Return • Intake temperature - 85°F
• 18 hrs/day in summer, 24 hrs/day in winter • Average Load-80%
• Used for process heat and space heating • Operation 18 hrs per day
Emulsion Removal Tank Ink Curing Oven
• 3ftx5ftx5ft • Steam heat from boilers
• No cover • Insulated
• Not heated • No covered opening
Curing Oven
• Natural Gas
• Operation Temperature 120°F
• Operation Hours 16 hrs/day
The assessment team should brain storm possible opportunities to be implemented in the facility.
After the team has developed its initial list of opportunities the team should list these out and collect
information necessary to evaluate each opportunity. A list of potential opportunities for our fictitious facility,
Mars Screen Printing is given in Exhibit 2.20.
Exhibit 2.20: Energy Conservation and Pollution Prevention Opportunities for Mars Screen Printing
Energy Conservation Opportunities
1. Increase Monitoring of Boiler Efficiency to Maximize Fuel Use
2. Repair Compressed Air Leaks
3. Repair Steam Leaks
4. Return Condensate for Supply Water Pre -heating
5. Schedule Use of Electrical Equipment to Minimize Peak Demand
6. Recover Oven Exhaust Heat for Space Heating
7. Replace Compressor Belts with V-Cogged Belts
8. Insulate Bare Steam Lines
9. Lower Pressure of Compressed Air to Minimum Necessary Level
36 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Energy and Pollution Prevention Assessments
Pollution Prevention Opportunities
1. Cover Cleaning Tanks to Minimize Evaporative Losses
2. Recover Solvent from Exhaust for Equipment Cleaning
3. Minimize Ink Mixing to Reduce Excess
4. Improve Housekeeping
5. Substitute Non-Hazardous Inks for Current Inks
Using the opportunity list generated for our fictitious facility, an example decision matrix is
provided in Exhibit 2.21. Chapter 3 discusses methods to evaluate the pollution prevention and energy
conservation opportunities identified during an opportunity assessment.
Exhibit 2.21: Example Decision Matrix
Opportunity
Payback
Period
Cost
Savings
Technical
Feasibility
Operational
Impact
Compliance
Issues
Energy Conservation Opportunities
1 . Increase Monitoring
of Boiler Efficiency to
Maximize Fuel Use
2. Repair Compressed
Air Leaks
3. Repair Steam Leaks
4. Return Condensate for
Supply Water Pre -
heating
5. Schedule Use of
Electrical Equipment
to Minimize Peak
Demand
6. Recover Oven
Exhaust Heat for
Space Heating
7. Replace Compressor
Belts with V-Cogged
Belts
8. Insulate Bare Steam
Lines
9. Lower Pressure of
Compressed Air to
Minimum Necessary
Level
2yr.
>1 yr.
>2yr.
<1 month
<2 months
<2 months
High
High
High
Medium
Medium
Minimal
Minimal
High
Medium
Easy
Easy
Easy
Hard
Hard
May cause
condensation
of solvent in
exhaust stack
Easy
Easy
Easy
Positive
Positive
Positive
Positive
Unclear
Negative
Positive
Positive
Unclear
Improve Air
Emissions
Reduce
electricity use
Reduce fuel
use
Reduce fuel
use
None
Reduce energy
use for space
heating
Increase
efficiency
Reduce steam
use
Reduce
compressed air
use
Notes
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Energy and Pollution Prevention Assessments
Notes
Exhibit 2.21: Example Decision Matrix (cont.)
Opportunity
Payback
Period
Cost
Savings
Technical
Feasibility
Operational
Impact
Compliance
Issues
Pollution Prevention Opportunities
1 . Cover Cleaning Tanks
to Minimize
Evaporative Losses
2. Recover Solvent from
Exhaust for
Equipment Cleaning
3. Minimize Ink Mixing
to Reduce Excess
4. Improve
Housekeeping
5. Substitute Non-
Hazardous Inks for
Current Inks
5yr.
<1 yr.
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
CHAPTER 3. EVALUATION OF ENERGY CONSERVATION AND
POLLUTION PREVENTION OPPORTUNITIES
Evaluation of identified opportunities is the essence of an industrial assessment. Evaluation of
opportunities provides a facility with information needed to make decisions on opportunity selection and
implementation. There are five basic steps in the evaluation of energy conservation and pollution
prevention opportunities and determining their feasibility.
1. Clearly describe current practices.
2. Describe the recommended energy conservation or pollution prevention opportunity.
3. Evaluate benefits.
4. Technical feasibility analysis.
5. Evaluate economic benefits.
These steps provide the framework for the feasibility analysis of each opportunity. As the team
follows these steps, it will be compiling information for the analysis of each opportunity as well as the
information that will be needed to justify implementation of the opportunity to management. The remainder
of this chapter describes the evaluation process using these five steps. Two examples of opportunity write-
ups are given at the end of this chapter to illustrate these concepts.
3.1 Describe the Current Practices
The first step in the analysis of an energy conservation or pollution prevention opportunity is to
clearly describe the current practice in simple language. This description should include:
• Overview of current operations and procedures
• Assumptions
• Impacts
• Raw material costs
• Energy costs
• Waste management costs
A simple description will provide readers unfamiliar with the operation information needed to
understand what is happening without knowing all the technical details.
3.1.1 Overview of Current Operations
An overview should include a description of the operation, procedures, equipment used, materials
used, and wastes generated by the operation as necessary to provide background information for an
identified opportunity. The operation can be defined in many ways but in the evaluation the Team should
describe only the functions associated with the specific opportunity. For example, if the identified
opportunity is to adjust the air fuel ratio of the boiler, the Team should describe operations or procedures
associated with boiler operation and maintenance. If the identified opportunity were to adjust the boiler
steam pressure, the Team should include information about boiler operation and maintenance as well as
information about facility steam requirements.
The amount of information included in a description of current practices will vary in content and in
detail. The overview should include enough detail to give anyone who reads the analysis the background
needed to understand the process and the identified opportunity.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 39
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
3.1.2 Assumptions
Inevitably the Assessment Team will need to make assumptions or estimates when information is not
available or simply doesn't exist. In these cases, the assessment team will be required to make reasonable
estimates based on available information, observation and best professional judgement. Any time the
assessment team is required to make estimates or assumptions it is important to document this in the analysis
write-up for future reference. These estimates or assumptions may include any assumptions with regard to
labor costs, utility or waste disposal costs, hours of operation, or loads, etc. Assumptions do not necessarily
need to all be stated in the background information but should be clearly stated when made.
3.1.3 Impacts
The impact that the current operation has should be described as part of the current practice. This
would be the impact that the current practice has on the facility or operation energy consumption, waste
generation, air emissions, and etc. For example, ink is mixed manually and personnel responsible for ink
mixing consistently mix too much ink. The impact of this practice would be excess raw material purchases,
increased waste disposal, and air emissions. For energy conservation opportunities the impacts that would be
described might include increased energy consumption and air emissions, or increased demand charges.
3.1.4 Raw Material Costs
Raw materials account for a large percentage of an industrial facility's expenses. Raw materials
include any material purchased for the purpose of producing a product or items or to be used in clean-up and
ancillary operations. The Assessment Team can obtain raw material cost information from purchase records
at the facility. In addition, when accounting for raw material costs, the Team should account for material
management costs when applicable. For instance, if an opportunity will greatly reduce raw material
purchases and there is an associated labor cost for managing the material (i.e., moving it around the facility,
managing the containers, etc.) the team should include the reduced labor costs when evaluating the
opportunity.
3.1.5 Energy Costs
Energy costs or utility costs are also major operating expenses for industrial operations. Some
operations are very energy intensive requiring large amounts of energy for heating of materials to produce a
product. The Assessment Team should review and account for energy costs during the assessment. Chapter
2 discussed the collection of electric, natural gas, or other energy source information to allow graphs and
summary tables to be prepared. The following sections will discuss how to read the utility bills and define
some of the terminology used.
3.1.5.1 Electric Bills and Rates
The structure of electric bills differs from region to region. The rates and structure of utility bills
cannot be set arbitrarily since all utility companies are regulated by a Public Utility Commission or Public
Utility Board of the state in which it operates. Approval is needed for any change in rates or structure and
any change is subject to reviews confirming the necessity of such change. The rates reflect the requirement to
maintain a sound financial condition of a utility company and also to pay a "reasonable return" to the
shareholders.
The Electric Bill: Its Components and Where the Money Goes
1. Components Of Your Electric Bill
• Customer Charge • Reactive Demand Charge
• Demand Charge • Sales Tax
• Energy Charge
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
2. What Is Included In The Customer Charge?
• Fixed monthly amount designed to recover:
Service drop - wires from transformer to connection on building.
Meter.
Billing, credit and collection and related costs.
Customer service - costs to encourage safe, efficient and economical use of electricity.
3. What Is Included In The Demand Charge?
• Generally based on highest 15-minute integrated kW demand during month or 80% of highest
demand during winter months.
• Designed to recover:
Investments in generating plants.
Investments in transmission system - 345,000, 115,000 & 34,500 volt lines and sub-stations.
Investments in distribution system - all voltages below 34,500 volts, including distribution
transformer.
]
Exhibit 3.1: Relation of Demand (kW) to Energy
(kWh)
5kW
k.
w\
Energy = 5 kW x 730 hours = 3650 kWh
0 Hours per Month 730
50 kW fc.
w
Energy = 50 kW x 73 hours = 3650 kWh
0 73 Hours per Month 730
4. What Is Demand (Load)?
A. Assume: Fifty (50) - 100 watt light
bulbs.
All 50 bulbs are on at the same time.
50 bulbs x 100 watts each = 5000
watts
B. Total Demand (Load) on System:
5000 watts/1000 = 5 kilowatts (5 kW)
This is illustrated in Exhibit 3.1.
5. What Is Included In the Energy Bill?
• Price per kWh designed to recover:
Variable costs to generate electricity
Oil costs
Nuclear fuel costs
Varies with voltage levels due to losses
6. What Is the Reactive Demand Charge?
• An amount per kVAR of reactive
demand in excess of 50% of monthly
demand (LGS is 50% of first 1,000
kW of monthly on-peak kW demand
and 25% of all additional monthly on-
peak demand).
• No kVAR billing unless power factor below 90% (higher for customers with demands in
excess of 1,000 kW).
• Designed to recover cost of capacitors used to offset effects of customers with poor power
factor.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
41
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
Notes
1. Sales Tax
• If electricity is used in a manufacturing process, the customer can get an exemption for the
majority of sales ta?es. It is advantageous for the community to have the tax incentives in order
to preserve or promote manufacturing in the area.
3.1.5.2 Example of Gas Bills and Gas Rates
Unlike electric charges, gas utility bills are very simple to read. In the following section a typical
example of a monthly gas utility bill is introduced.
Terminology and the Bill
1. The service period on a monthly basis.
2. The rate schedule and terms used.
Gas company rates are based on the following priority schedule:
GN-1 is for residential and small industrial users consuming less than 100,00 cubic feet of gas
per day.
GN-2 is for industrial users consuming over 100,000 cubic feet per day and who have standby
fuel capability.
3. The actual month's consumption in cubic feet of gas.
The billing factor is the actual heat content of the gas (can vary depending on location).
The final column is the amount of therms used for the month.
Meter units are 100 cu. ft. (i.e., example equals 3,806,000 cu. ft.).
Exhibit 3.2: Sample Natural Gas Bill
Service Period
06-18-79
07-18-79
Service Address;.
Rates
Therms
GN-1
GN-2
GN-3
Total
17,667
22,486
40,153
$9,760.09
Meter Number
2345678
Meter Readings
Previous Present
917920 955980
Difference
38060
Billing Factor
1,055
Therms
40,153
Our hypothetical bill is interpreted as follows:
1. Gas consumption @ GN-2 rate
2. Gas consumption @ GN-3 rate
3. Total gas consumption
= 17,667 therms
= 22.486 therms
= 40,153 therms
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
4. Difference in meter readings = 3,806,000 cu. ft.
5. Btu content of gas = 1,055 Btu/cu. ft.
6. Amount of therms used per month
= (3,806,000 x 1,055) / 1000,000 = 40,153 therms
1 therm = 100,000 Btu
Actual BTUs consumed = 40,153 x 105 Btu
Li-Plant Metering
The monthly gas bills show how many Btu's have been expended to produce a product. However,
the bill does not indicate where the Btu's where used in a particular gas consuming process.
As the nation's energy requirements grow, industry can expect to pay even more for gas in future
years. Plants that remain dependent upon gas for their production processes will be placing even greater
emphasis on in-house conservation efforts in order to achieve maximum production efficiency from this
increasingly expensive fuel. Cost allocations within departments and fuel surcharges to customers will
become commonplace. Close monitoring of allocated supplies will become a necessity in energy
management. Gas consumption monitoring can also be advantageously used to control oven or furnace
temperatures and prevent over-temperature damage.
A relatively low cost monitoring device is the "Annubar." This device is a primary flow sensor
designed to produce a differential pressure that is proportional to the flow. The flo-tap annubar can be
inserted and removed from operation without system shut down. It can be interfaced with secondary
devices, a standard flow meter is available for rate of flow indication. It can also be used as a portable meter
or permanently mounted one. Annubar connected to a differential pressure transmitter (electric or
pneumatic) is used with a variety of standard secondary equipment for totalizing, recording, or controlling
complex systems.
3.1.5.3 Fuel Oil Rates
A private contractor usually supplies fuel oil. The price is negotiated before the season or period of
interest to both parties. The supplier is obligated to provide the oil to the customer for an agreed upon
period (typically a year). The price is fixed for an estimated amount of consumption and provides for an
adjustment if supplier's costs change during the period. The supplying company might require a minimum
purchase, called "allotment," in order to maintain the required service as well as the price. It is noteworthy
to point out that some customers may decide to burn more fuel than necessary for the operations just to
preserve their pricing. The normal way of calculating the average cost of oil is simply the total money spent
divided by volume purchased.
In the United States three types of fuel are available. The most expensive oil is No. 2 at 138,000
Btu/gallon. A little cheaper option is No. 4 with 142,000 to 145,000 Btu/gallon and the cheapest is No 6
with 149,690 Btu/gallon. It is important to keep in mind that the fuels are not interchangeable because the
combustion equipment is designed for only one type of fuel. Different fuels also have to be handled
differently, for example No. 6 fuel requires heating to flow. Detailed information about equipment,
characteristics of fuel oils and exact Btu content is available from individual suppliers.
3.1.6 Waste Management Costs
Waste management costs include not only the actual disposal costs for waste materials but the on-
site management costs like labor for drumming and moving the material, labor for waste treatment
processes, and labor to file required paperwork. On-site costs may not be directly from a bill but can usually
be closely estimated using information from various sources. This is often true for labor requirements for
particular operations. The assessment team should use information from on-site interviews of facility
personnel to make an estimate in these cases. The actual disposal cost information is available from
hazardous waste manifests, bills for transportation, bills for solid waste disposal. The remainder of this
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 43
Notes
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
*r . section briefly discusses the pertinent information that the assessment team will need to evaluate various
opportunities.
3.1.6.1 Hazardous and Regulated Non-hazardous Waste Disposal
Hazardous and regulated non-hazardous waste disposal is a significant line item cost for facilities.
When calculating hazardous waste disposal costs, the assessment team must include these items.
1. Disposal fees
2. Transportation costs
3. In-house labor for management (labor for drumming the waste, moving to hazardous waste storage,
and filing paperwork)
4. Reduction in containers purchase for disposal
Not all of these costs will apply to every waste. For example if the facility is purchasing over pack drums for
some of their wastes and not others. The team should use best professional judgement when applying these
factors.
3.1.6.2 Solid Waste Disposal
Solid waste is what most people think of as trash. It would include waste paper, cardboard, personal
items, food wastes, etc. While solid waste is not as expensive as hazardous waste to dispose of, it is still a
significant expense. When calculating solid waste costs and cost savings, the team must include these items.
1. Tipping fees (fee for disposal in landfill or other similar fee)
2. Transportation costs, if any
3. Rental and pick-up fees for trash containers
4. In-house labor costs, if any
Again, the team should use best professional judgement to include or not include these and other costs.
3.1.6.3 Air Emission Management Costs and Emission Fees
Air emissions have become an increasingly important issue for industrial plants. Evaluation of
opportunities that significantly reduce air emissions should include these items.
1. Air emissbn fees
2. Changes in air emission control costs
3. Changes in monitoring requirements for both environment and health and safety.
4. Changes in labor for management of air emissions.
3.1.6.4 Sanitary and Storm Sewer Discharge Fees
Sanitary and storm sewer discharge fees do not tend to be large line item costs for many facilities.
Changes in fees as a result of implementing an opportunity should be accounted for or noted even if
significant. Items that should be included in a cost evaluation are:
1. Discharge fee
2. Labor for on-site management of waste water or other solutions discharged to the sewer
3. Changes in treatment costs, if any.
There may be other items that may be added for various operations. The assessment team should include all
significant items.
44 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
3.2 Describe the Recommended Opportunity
A description of the recommended action needed to accomplish the energy conservation
or pollution prevention should be given in simple language with a minimum of technical details. The
recommended action should include a description of the proposed change including equipment changes,
process modifications, and changes in procedures. In addition, this description should point out the
advantages and disadvantages in implementation of the opportunity. This description of the recommended
action does not need to include calculations of energy and waste reduction, as these will be included in the
next sections.
The advantages should include items like reduced waste generation, reduced energy consumption,
improved efficiency of operations, etc. The disadvantages should include items like increased labor,
noxious odors, extensive facility modifications, etc. The advantages for implementing an opportunity are
sometimes obvious but often an assessment team will not account for the intangible benefits and likewise
disadvantages. The benefits may include improved worker health from reduced exposure, improved public
image, and reduced liability. Likewise, the disadvantages may include strong citrus odor from aqueous
cleaner.
3.3 Evaluate the Energy Conservation and Pollution Prevention
Benefits
The evaluation begins with the calculation of the current energy usage or waste generation for a
particular piece of equipment or process associated with the identified opportunity. Information such as
operation times, required pressures for steam and air, light levels, or waste generation information collected
during the on-site assessment phase will be needed to complete the calculations. Next, the Team will
estimate the energy conservation or pollution prevention potential from implementation of the opportunity.
This may entail some initial research for information on equipment needed for implementation of the
opportunity through literature searches or collection of vendor information to verify estimated reduction of
energy consumption or wastes. It is important to note any assumptions made to complete calculations and
where necessary conservative estimates should be made. The remainder of this section will discuss how to
calculate energy consumption and conservation as well as waste generation and pollution prevention
benefits.
3.3.1 Energy Conservation Calculations
When performing any type of comparisons between energy requirements for equipment of
conservation alternatives; care should be taken to use the same unit of measurement for all types of energy in the
analysis. Exhibit 3.3 lists several sources of energy and its common unit of measure. Usually as scrap material
from a manufacturing process, wood is occasionally used as a fuel source in industrial boilers and is more
commonly used in homes for space heating. Since the BTU value of wood varies significantly with its
preparation and species, it has not been included in Exhibit 3.3.
Energy requirements for different applications also use diverse units of measure. For instance, cooling
capacities of air conditioning units are usually measured in Tons, heating unit capacities are defined in BTUs,
and motor capacities are measured in horse-powers or watts. Exhibit 3.4 lists the common units employed for
various applications. It should be stressed that while these are the common units applied to these applications
they are not the only units of measure used for these applications. For example, heating units and motors are
sometimes measured in KW instead of BTUs and hp. This is especially true of equipment that is purchased
from countries where the metric system is used.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 45
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
Notes
Exhibit 3.3: Common Units of Measure and Conversions to BTTJs (U.S. Dept of Commerce, 1974)
Type of Energy
Butane, Liquefied
Coal, Anthracite
Coal, bituminous
Coal, lignite
Coal, Sub-bituminous
Electricity
Fuel Oil #2
Fuel Oil #6
Kerosene
Natural Gas
Propane, Liquefied
Common unit of Measure
Gallons (Gal)
Pound(s) (Ib or Ibs)
Pound(s) (Ib or Ibs)
Pound(s) (Ib or Ibs)
Pound(s) (Ib or Ibs)
Kilowatts -hours (KW)
Gallons (Gal)
Gallons (Gal)
Gallons (Gal)
Cubic Feet (CF) or Hundreds of Cubic Feet (CCF)
Themis
Gallons (Gal)
BTU Equivalent
91,600 BTU/Gal
13,900 BTU/lb
14,000 BTU/lb
11, 000 BTU/lb
12,600 BTU/lb
3,412 BTU/KWh
140,000 BTU/Gal
152,000 BTU/Gal
134,000 BTU/Gal
1,OOOBTU/CF
1 00,000 BTU/therm
103,300 BTU/Gal
Exhibit 3.4: Units of Measure for Various Applications (U.S. Dept of Commerce, 1974)
Application
Air Conditioning /
Refrigeration
Heating
Motors
Boilers
Lighting
Units of Measure
Tons
BTUs
Horsepower (hp)
Pounds of steam generated
per hour or BTUs
Watts
BTU Equivalent
12,000 BTU/hr
—
2545 BTU/hr
Varies with specific
characteristics of boiler
3.412 BTU/hr
When calculating energy conservation opportunities you must be sure to account for these factors.
• Current energy usage
• Projected energy consumption reduction
• Energy consumption of new equipment
• Changes in energy requirements for associated equipment
Each of these factors should be clearly stated with any assumptions that have been made to complete the
calculations. Chapters 6-10 discuss various types of equipment used in industrial and commercial
applications. These chapters describe the equipment, energy usage and some energy conservation
opportunities.
3.3.2 Pollution Prevention Calculations
There are many factors that the assessment team must account for in evaluating a pollution prevention
opportunity. These factors are:
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
• Changes in raw material consumption
• Changes in hazardous waste generation
• Changes in solid waste generation
• Changes in air emission generation
• Changes in energy usage
Implementation of a pollution prevention opportunity may need to include all these factors or may
include only a few. When performing any type of comparisons for pollution prevention opportunities; care
should be taken to use the same unit of measure for all types of materials used in the analysis. This means that
to ensure consistency in your calculations all raw materials should be converted to the same unit of measure if
possible. For example, if a facility lists it raw materials for a printing operation as 60,000 gal of ink and 20,000
Ibs. of ink remover, the unit should be converted to either both be pounds or both be gallons.
After performing these energy conservation and pollution prevention calculations, this information
will then be used to calculate the cost savings for the given opportunity.
3.4 Technical Evaluation of Energy Conservation and Pollution
Prevention Projects
A technical evaluation will determine whether a proposed energy conservation or pollution
prevention option is technically feasible. Some technical evaluations will be straightforward, such as
procedural or housekeeping changes, which may require little more than review, approval, and training of
selected staff. Other technical evaluations will require the expertise of a variety of people. You may require
significant coordination with the operators, vendors, and consultants before deciding whether a proposed
pollution prevention solution is feasible. In some cases, you may need to test your proposed solution in a
laboratory or perform a field demonstration. Also keep in mind that some equipment vendors are willing to
validate their applicability to your process prior to purchase of the equipment. Exhibit 3.5 presents typical
evaluation criteria that will apply to implementation of an opportunity at a specific facility. Depending on
facility requirements there may be other criteria that should be included.
These criteria will be used to build the information for the implementation costs. Correct
estimation of implementation costs is very important as implementation costs can have a significant impact
on a facility. When evaluating implementation costs, the assessment the team should consider these items.
• C o st of e quipment
• C o st for facility modifications
- Expanded plant area
- Improvements to utilities
- Ventilation requirement
• Installation costs
• Employee Training
• Periodic Maintenance
Annual Operating Costs
- Utilities
- Labor
- Training
- Maintenance
Replacement parts and filters
Cost of containers and other supplies
associated with disposal
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
47
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
Notes
Exhibit 3.5: Typical Technical Evaluation Criteria
Will it conserve energy or reduce waste?
Is the system safe for our employees?
Will the product quality be improved or maintained?
Is there space available in the facility
Are the new equipment, materials, or procedures compatible with our production operation
procedures, workflow and production rates?
Will more labor be required to implement the option?
Will we need to train or hire personnel with special expertise to operate or maintain the new system?
Do we have the utilities needed to run the equipment? Or, must they be installed at increased capital
cost?
How long will production be stopped during system installation?
Will the vendor provide acceptable service?
Will the annual operating and maintenance costs increase?
Will the system create other energy consumption or environmental problems?
Also, if the opportunity will require installation of large pieces of equipment, the team should
consider factors that will influence installation like will the equipment fit through existing doors. While this
seems like an obvious question, several facilities have had equipment arrive for installation that wouldn't fit
through the doors.
3.5 Economic Evaluation of Energy and Pollution Prevention Project
Costs
An economic analysis is a process in which financial costs, revenues, and savings are evaluated for a
particular project. This analysis is necessary to evaluate the economic advantages of competing projects and
is used to determine how to allocate scarce resources. An accurate estimate of energy conservation and
pollution prevention project costs is essential to decision making.
The easiest and most common economic evaluation is the one that compares the up-front purchase
price of competing project alternatives. However, the up-front purchase price is typically a poor measure of a
project's total cost. Other costs, such as labor, maintenance (including materials and wastes), reliability,
disposal/salvage value, and training must also be accounted for in the financial decision making process. As
a result, the type of economic evaluation tools and techniques used may vary from one facility to the next in
order to perform a meaningful economic evaluation.
This section presents three methods commonly used to allow a comparison to be made between
competing projects. These methods include:
• Payback Period,
• Net Present Value, and
• Internal Rate of Return.
Finally, two additional economic analysis tools are introduced at the end of this section: the Life
Cycle Costing (LCC) tool and the Total Cost Assessment (TCA) tool. Both tools are used to establish
economic criteria to justify energy conservation and pollution prevention projects. TCA is used to describe
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
internal costs and savings, including environmental criteria. LCC includes all internal costs plus external
costs incurred throughout the entire life cycle of a product, process, or activity.
3.5.1 Common Methods of Comparing Financial Performance
Financial performance indicators are needed to allow comparisons to be made between competing
project alternatives. Three methods of comparison are currently in widespread use: Payback Period, Net
Present Value, and Internal Rate of Return.
3.5.1.1 Payback Period
The payback period is used most often. The purpose of the payback analysis is to determine the
length of time it will take before the costs of a new project is recouped. The formula used to calculate the
Payback Period is:
Equation: Payback period (in years) = I/(N-C)
where I = initial investment, start up costs (in dollars)
C = annual cost of current practice (in dollars/year)
N = annual cost of new practice (in dollars/year)
Although the payback period indicator is the simplest, there are certain limitations to the accuracy
of the indicator. One limitation is that the payback period indicator does not account for all of the cash
flows of a project. It considers the cash flows that take place before the start-up costs are paid back, but
ignores all cash flows after this threshold. Ignoring these cash flows can skew the true profitability of
implementing a proposed project.
As an example, when comparing two projects, A and B, and each requires an initial start-up cost or
investment of $50,000 and project A generates $25,000 in revenues (or annual savings) for the next three
years and project B generates $20,000 in revenues for the next 20 years. Using the principles of payback
period, project A is more profitable than project B because you recover your start-up costs (or initial
investment costs) earlier with project A. However, project A generates revenues for only three years,
whereas project B continues to earn revenues for 20 years. This example illustrates that a projects payback
period does not necessarily reflect its overall profitability because it only measures the time it takes to reach
the break-even point for implementing a project. For pollution prevention projects, this can be an especially
significant limitation because many annual operating costs may occur several years after the initial start-up
costs have been incurred.
A second limitation is that complex scenarios can have multiple paybacks when annual operating
costs vary significantly from year to year or when there are start-up costs in multiple years.
3.5.1.2 Net Present Value
The Net Present Value (NPV) method is based upon the concept that a dollar today is worth more
than a dollar in the future, a concept known as the time value of money. This concept captures the cost of a
given project, taking into consideration future value. The discount rate, similar to an interest rate, is the
mechanism that equates today's dollar with its value in the future.
A simple illustration considers what the value of a dollar invested today will be worth in a year. At
a simple interest rate of 5 percent, a dollar today is worth $1.05 one year from now. This is referred to as
the "present value" of one dollar one year from now at an interest rate of 5 percent.
The selection of an appropriate discount rate is one of the most difficult aspects of a cost-benefit
analysis, but it is also one of the most important. The discount rate is a function of what a business must pay
to borrow money and what rate of return it must earn to satisfy a company's financial requirements. For
evaluating multi-year and long-term projects, the identification of an accurate discount rate is crucial. For
example, a project that looks favorable using a 3 percent discount rate may look very unattractive at a 10
percent rate.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 49
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
*r . For an investment to be cost beneficial, it must return more dollars in the future (i.e., benefit) than
the amount of dollars spent in the present (i.e., the cost of the investment) to account for this difference in
value. In other words, the dollar benefits gained in the future must be greater than the initial investment.
This method progressively reduces (discounts) the value of costs and revenues occurring in future years. The
formula for NPV is:
Equation: I + [(AS - CE)i( PW)i +(AS - CE)2(PVIF)2 +...+ (AS - CEXfPVTF),,] = NPV
where I = initial investment, start-up cost (expressed as a negative number)
AS = annual savings (cash inflows)
CE = capital expenses (cash outflows)
(AS - CE)! = net cash flow year 1
(AS - CE)2 = net cash flow year 2
(AS - CE)n = net cash flow year n
PVIF = 1/(1 +r)' = present value interest factor
r = discount rate of money (i.e., current rate of return)
t = incremental time period, 0 thru n, normally expressed in years
The first step to determining the net present value of a proposed project is to determine the net
difference (net cash flow) for each year over the specified time period (AS-CE)n.
The second step is to calculate the present value interest factor (PVIF) based on the companies
discount rate. The following equation is used to calculate the PVIF for each year of the specified time period.
Equation: PVTF = l/(l+r)1
where r = discount rate of money (i.e., current value of money to the company)
t = incremental time period (i.e., 1, 2, 3, etc.), normally expressed in years
The PVIF is calculated for each incremental time period. The PVIF always equals one, when n=0;
the start-up costs . As the time period (n) increase the PVIF decreases.
The third step is to multiply the net difference in cash flows for each incremental time period
determined in Step 1 one by the corresponding PVIF determined in Step 2 to calculate the present value (PV)
of the money in today's dollars. The following equation is used to calculate the PV for each time period.
Equation: PV = (AS - CE) X (PVIF); at a given time penod (n)
The last step is to sum the PV's for each incremental time period (0 through n) and then subtract the
star-up cost (I) to obtain the net present value (NPV) of implementing the project.
A project is deemed profitable if its net present value is greater than zero. When the NPV is greater
than zero a project is sufficient to (1) pay off the initial star-up costs, (2) pay off interest payments to creditors
who lent the company money to pay for the start-up costs, (3) provide the required return to shareholders or a
company's financial requirements, and (4) increase economic value in the company.
Net present value is a very useful indicator because it is a direct measure of a projects profitability in
dollars and therefore most directly relates to a company's value of money. It does however, depend
significantly on the value of the discount rate. In general, net present value is one of the strongest financial
performance indicators because it has few limitations and can be used in all types of analyses.
3.5. 1.3 Internal Rate of Return
The Internal Rate of Return (TRR) is another technique used in decision making. The purpose of the
IRR is to determine the interest rate (r) at which NPV is equal to zero. If that rate exceeds the hurdle rate
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
(defined as the minimum acceptable rate of return on a project), the investment is deemed worthy of
funding. The formula for IRR is:
Equation: I + [(AS - CE)l (PVW\ +(AS - CE)2(PVIF)2 +...+ (AS - CE)n(PVIF)n] = 0
where I = initial investment, start-up cost (expressed as a negative number)
AS = annual savings (cash inflows)
CE = capital expenses (cash outflows)
(AS - CE)! = net cash flow year 1
(AS - CE)2 = net cash flow year 2
(AS - CE)n = net cash flow year n
PVIF = 1/(1 +r)' = present value interest factor
r = discount rate of money (i.e., current rate of return)
t = incremental time period, 0 thru n, normally expressed in years
In practice, IRR is usually calculated through trial and error, where different interest rates are tried
until the IRR is found. Using the IRR financial performance indicator, projects are ranked according to their
IRRs, and projects with IRRs in excess of the appropriate discount factor are accepted. Although, IRR and
NPV methods will lead to the same accept - reject decisions for an individual project, they can give
contradictory signals concerning choices between mutually exclusive projects. That is, a given project
might have a higher IRR but a lower NPV than an alternative project. This problem arises because the IRR
is the implied reinvestment rate (discount rate) for cash flows under the IRR method while the discount rate
used in the NPV method is a company's cost of capital. If the IRR for a project is very different from the
cost of capital, these differing reinvestment rates can lead to differences in project ranking. In most
situations, reinvestment of cash flows at a rate close to the cost of capital is more realistic; therefore, the
NPV method is generally superior.
3.5.2 Additional Economic Analysis Tools
Life Cycle Costing (LCC) tool and the Total Cost Assessment (TCA) tool are introduced below as
concept overviews. Both tools can be used to establish economic criteria to justify energy conservation and
pollution prevention projects. TCA is used to describe internal costs and savings, including environmental
criteria. LCC includes all internal costs plus external costs incurred throughout the entire life cycle of a
product, process, or activity.
3.5.2.1 Life-Cycle Cost Analysis
Life-cycle costing (LCC) has been used for many years by both the public and private sector. It
associates economic criteria and societal (external) costs with individual energy and pollution prevention
opportunities. The purpose of LCC is to quantify a series of time-varying costs for a given opportunity over
an extended time horizon, and to represent these costs as a single value. These time varying cost usually
include the following.
• Capital Expenditures - Costs for large, infrequent investments with long economic lives (e.g., new
structures, major renovations and equipment replacements).
• Non-recurring Operations and Maintenance (O&M) - Costs reflecting items that occur on a less
frequent than annual basis that are not capital expenditures (e.g., repair or replacement of parts in a
solvent distillation unit).
• Recurring O&M - Costs for items that occur on an annual or more frequent basis (e.g., oil and
hydraulic fluid changes).
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 51
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
• Energy - All energy or power generation related costs. Although energy costs can be included as a
recurring O&M cost, they are usually itemized because of their economic magnitude and sensitivity
to both market prices and building utilization.
• Residual Value - Costs reflecting the value of equipment at the end of the LCC analysis period.
Considers the effects of depreciation and service improvements.
By considering all costs, a LCC analysis can quantify relationships that exist between cost
categories. For example, certain types of capital improvements will reduce operations, maintenance, and
energy costs while increasing the equipment's residual value at the end of the analysis period. When energy
costs are broken out from recurring Q&M costs, there is the potential for the application of environmental
criteria, but this is generally not the focus of traditional LCC analysis.
Societal (external) costs include those resulting from health and ecological damages, such as those
related to unregulated air emissions, wetland loss, or deforestation, can also be reflected in a LCC analysis
either in a quantitative or qualitative manner. LCC includes the following cost components.
• Extraction of Natural Resources - The cost of extracting the material for use and any direct or
indirect environmental cost for the process.
• Production of Raw Materials - All of the costs of processing the raw materials.
• Making the Basic Components and Product - The total cost of material fabrication and product
manufacturing.
• Internal Storage - The cost of storage of the product before it is shipped to distributors and/or retail
stores.
• Distribution and Retail Storage - The cost of distributing the products to retail stores including
transportation costs, and the cost of retail storage before purchase by the consumer.
• Product Use - The cost of consumer use of the product. This could include any fuels, oils,
maintenance, and repairs which must be made to the equipment.
• Product Disposal or Recycling - The cost of disposal or recycling of the product.
3.5.2.2 Total Cost Accounting
The total cost accounting (TCA) tool is especially interesting because it employs both economic and
environmental criteria. As with the LCC analysis, the TCA study is usually focused on a particular process as
it affects the bottom-line costs to the user. Environmental criteria are not explicit, i.e.; success is not
measured by waste reduction or resource conservation, but by cost savings. However, since the purpose of
TCA is to change accounting practices by including environmental costs, environmental goals are met
through cost reductions.
Because of its focus on cost and cost effectiveness, TCA shares many of the features of LCC
analysis by tracking direct costs, such as capital expenditures and O&M expenses/revenues. However, TCA
also includes indirect costs, liability costs and less tangible benefits—subjects that are not customarily
included in LCC analysis. A summary of costs included in TCA is presented in Exhibit 3.6. By factoring in
these indirect environmental costs, TCA achieves both economic and environmental goals. Because of its
private sector orientation, TCA uses Net Present Value (NPV) and Internal Rate of Return (TRR) as well as
other economic comparison methods.
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
Exhibit 3.6: TCA Cost Categories
Direct Costs
Capital Expenditures
• Buildings
• Equipment
• Utility connections
• Equipment Installation
• Engineering
Operations and Maintenance
Expenses/Revenues
• Raw materials
• Labor
• Waste disposal
• Utilities
• Value of recovered
materials
Indirect or Hidden Costs
Compliance Costs
• Permitting
• Reporting
• Monitoring
• Manifesting
Insurance
On-Site Waste Management
Operations of On-Site
Pollution Control Equipment
Liability Costs
Penalties and Fines
Personal Injury and Property
Damage
3.6 Energy Conservation and Pollution Prevention Project Examples
This section presents two energy conservation and pollution prevention projects from the fictitious
manufacturing facility discussed in Chapter 2 to illustrate the technical and economic concepts presented in
this chapter. They are presented in a simple format that could be used for a report. The assessment team
can set up a format that suits their need or particular report style requirements. The important point in
opportunity write-ups is to be consistent in format and content.
3.6.1 Adjust Air Fuel Ratio to Improve Boiler Efficiency
This example uses the total cost accounting and simple payback tools discussed above.
3.6.1.1 Current Practice and Observations
During the audit, the exhaust from the boilers was analyzed. This analysis revealed excess oxygen
levels that result in unnecessary energy consumption.
3.6.1.2 Recommended Action
Many factors including environmental considerations, cleanliness, quality of fuel, etc. contribute to
the efficient combustion of fuels in boilers. It is therefore necessary to carefully monitor the performance of
boilers and tune the air/fuel ratio quite often. Best performance is obtained by the installation of an
automatic oxygen trim system that will automatically adjust the combustion to changing conditions. With
the relatively modest amounts spent last year on fuel for these boilers, the expense of a trim system on each
boiler could not be justified. However, it is recommended that the portable flue gas analyzer be used in a
rigorous program of weekly boiler inspection and adjustment for the boiler used in this plant.
3.6.1.3 Anticipated Savings
The optimum amount of C>2 in the flue gas of a gas-fired boiler is 2.0%, which corresponds to 10%
excess air. Measurements taken from the stack on the 300 HP boiler gave a temperature of 400°F and a
Notes
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
*r . percentage of oxygen at 6.2%. By controlling combustion the lean mixture could be brought to 10% excess
air or an excess O2 level of 2%. This could provide a possible fuel savings of 3%.
The 300 HP natural gas boiler is used both for production and heating. It is estimated that 100% of
the natural gas is consumed in the boiler.
Therefore the total savings would be:
Savings in Fuel (therms/yr): = (% burned in boilers ) x (annual therms per year) x (percent possible
fuel savings)
= (1.0 x (56,787 therms/yr) x (0.02)
= 1,136 therms/yr
Savings in Dollars ($/yr): = (therms Saved/yr) x (cost/therm)
= 1,136 therms/yr x $0.644/therm
= $732/yr
3.6.1.4 Implementation
It is recommended that you purchase a portable flue gas analyzer and institute a program of monthly
boiler inspection and adjustment of the boiler used in the plant. The cost of such an analyzer is about $500
and the inspection and burner adjustment could be done by the current maintenance personnel. The simple
payback is:
$500 cost/ $732 = 8.2 months
3.6.2 Use Less Hazardous Inks in the Screen Printing Process
This example uses the total cost accounting and will also illustrate the simple payback, net present
value and internal rate of return tools discussed above. All three economic evaluation methods are presented
here to demonstrate the difference results for obtained by the three methods for the same project.
3.6.2.1 Current Practice and Observations
The inks currently used in the screen printing operation contain large quantities of methyl ethyl
ketone (MEK). These inks are a major source of hazardous air pollutants and hazardous waste at the facility.
Approximately 60,000 gal/year of ink are purchased and used in screen printing. Clean up of ink presses and
screens requires the use of an ink remover (20,000 gal/year) and paper towels (500 rolls/year).
3.6.2.2 Recommended Action
The facility should substitute less hazardous screen printing ink for the currently used inks.
3.6.2.3 Anticipated Savings
Assumptions
• The new "environmentally preferred" ink is a two-component ink, as opposed to the current ink
which is a one-component formulation. Two-component ink mixing equipment is required to use
the new ink. Start-up costs to purchase, install, and train staff is estimated at $75,000. Start-up costs
were determined from vendor literature and price estimates from a local distributor.
• Methyl ethyl ketone (MEK) is the main solvent carrier used in the current and "environmentally
preferred" ink. MEK is a listed hazardous air pollutant and is one of several reasons that Mars
Screen Printing is required to have a Title V Permit, under the Clean Air Act
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• A 75% reduction in solvent emissions (MEK from the ink) will be achieved by using the
"environmentally preferred" ink over the current ink formulation.
• A 25% reduction in the usage of ink remover will be achieved by using the "environmentally
preferred" ink over the current ink formulation.
• A 20% reduction in paper towel usage will be achieved by using the "environmentally preferred"
ink over the current ink formulation.
• Current material usage and waste generation annual volumes and costs are identified in Chapter 2.
• The "environmentally preferred" ink costs an additional $0.25 per gallon to purchase in comparison
to the current ink. Annual usage in gallons is anticipated to remain unchanged.
• Raw material purchase and disposal costs for ink remover and paper towels will remain unchanged
from the current practice, as well as, the disposal cost for solvent emissions.
Material purchase and waste generation volume and disposal costs for the current operation were
obtained from the data collection effort conducted during the assessment phase at the Mars Screen Printing
company. Exhibit 3.7 summarizes the material purchase and waste generation costs directly related to the
use and disposal of the current ink formulation.
Exhibit 3.7: Estimated Annual Cost of Environmentally Preferred Ink at Mars Screen
Printing
Cost Element
Raw Materials Purchased
Ink
Ink Remover
Paper Towels
Waste Disposal
Ink Remover
Solvent Emissions
Paper Towels
Units Purchased
60,000 gal.
15,000 gal.
400 rolls
3,750 gal.
4,250 gal.
75 Ibs.
Unit Cost
$2.85/gal.
$1.40/gal.
$1.10/roll
$2.72/gal.
$3.00/gal.
$1.00/lb.
Annual Cost
$171,000
$21,000
$440
$10,200
$12,750
$75
Estimated Annual Cost of New Practice = $215,465
3.6.2.4 Payback Period
To calculate the payback period for substituting an "environmentally preferred" ink for the current
ink for the current ink formulation three values must be determined: (1) the start-up cost (i.e., capital
equipment purchases and installation and training costs), (2) the annual cost to operate the current practice
(i.e., using the hazardous ink formulation), and (3) the estimated annual cost of the new practice (i.e., using
the "environmental preferred" ink formulation).
Start-up Cost
The start-up cost to change ink formulations is identified as $75,000 in the key assumptions.
Annual Cost of Current Practice
Material purchase and waste generation volume and disposal costs for the current operation were
obtained from the data collection effort conducted during the assessment phase at the Mars Screen Printing
company; see Chapter 2 for additional information on data collection efforts. Exhibit 3.8 summarizes the
Notes
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
Notes
material purchase and waste generation costs directly related to the use and disposal of the current ink
formulation.
Exhibit 3.8: Annual Cost of Current Ink Formulation at Mars Screen Printing
Cost Element
Raw Materials Purchased
Ink
Ink Remover
Paper Towels
Waste Disposal
Ink Remover
Solvent Emissions
Paper Towels
Units Purchased
60,000 gal.
20,000 gal.
500 rolls
5,000 gal.
17,000 gal.
100 Ibs.
Unit Cost
$2.60/gal.
$1.40/gal.
$1.10/roll
$2.72/gal.
$3.00/gal.
$1.00/lb.
Annual Cost
$156,000
$28,000
$550
$13,600
$51,000
$100
Annual Cost of Current Practice = $249,250
Estimated Annual Cost of New Practice
The key assumptions, identified above, were developed from vendor literature and price estimates
from distributors. According to the post-site visit research conducted, the proposed two-component ink
formulation will reduce total solvent emissions from the printing operation by 75%, as well as, reduce the
amount of ink remover used by 25% per year. Paper towel usage, a secondary material in the printing
process, was also estimated to be reduced by 20% from the reduction in ink remover. Although, the volume
of ink required to print one square foot of surface area is the same for either type of ink, the "environmentally
preferred" ink formulation costs an additional $0.25 per gallon. Exhibit 3.9 summarizes the estimated
material purchase and waste generation costs directly related to the use and disposal of the "environmentally
preferred" ink formulation.
Exhibit 3.9: Estimated Annual Cost of Environmentally Preferred Ink at Mars Screen Printing
Cost Element
Raw Materials Purchased
Ink
Ink Remover
Paper Towels
Waste Disposal
Ink Remover
Solvent Emissions
Paper Towels
Units Purchased
60,000 gal.
15,000 gal.
400 rolls
3,750 gal.
4,250 gal.
75 Ibs.
Unit Cost
$2.85/gal.
$1.40/gal.
$1.10/roll
$2.72/gal.
$3.00/gal.
$1.0(Mb.
Annual Cost
$171,000
$21,000
$440
$10,200
$12,750
$75
Estimated Annual Cost of New Practice = $215,465
Payback Period Calculation
The formula for Payback Period is:
Equation: Payback period (in years) = I/(C-N)
where I = initial investment, start up costs (in dollars) = $75,000
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C = annual cost of current practice (in dollars/year) = $249,000/year
N = annual cost of new practice (in dollars/year) = $215,465/year
Therefore Payback period (in years) = $75,000/($249,000/yr. - $215,465/yr.) = 2.2 years
3.6.2.5 Implementation
Implementation of this opportunity will require the purchase and installation of two-component ink
mixing equipment and switch over to the new inks. The vendor for the new equipment has estimated that
the equipment, installation, and training of employees will be $75,000. No modifications to the facility
structure are required and labor requirements are expected to remain the same. The facility will have to
make electrical and compressed air connections for the equipment and this is included in the installation
costs.
The formula for Payback Period is:
Equation: Payback period (in years) = I/(C-N)
where I = initial investment, start up costs (in dollars) = $75,000
C = annual cost of current practice (in dollars/year) = $249,000/year
N = annual cost of new practice (in dollars/year) = $215,465/year
Therefore Payback period (in years) = $75,000/($249,000/yr. - $215,465/yr.) = 2.2 years
The economic evaluation for this opportunity is also presented using the Net Present Value and the
Internal Rate of Return methods.
3.6.2.6 Net Present Value (NPV)
The net present value financial performance indicator looks at the profitability of a project over a
specified time period, usually expressed in years, in contrast to the payback period method which only looks
at the time period to recover the start-up costs. Simply, the NPV calculation takes into consideration the net
difference between the annual benefit received from implementing the project in comparison to the annual
cost to operate the process (including O&M cost, replacement parts, and equipment replacement based on its
anticipated life-span) each year of operation over the specified time period and calculates the net present
value by discounting the value of future expenses and income to today's dollars.
In order to calculate the NPV for the substitution of "environmentally preferred" ink at the Mars
Printing Company additional information about the life-span and replacement cost of the current ink
application equipment and the two-component ink mixing system is required. The following key
assumptions will be used to illustrate the use of net present value with the Mars Screen Printing company.
• The material substitution project will be analyzed over the life-span of the two-component ink
mixing system; 5 years.
• The life-span of secondary equipment (holding tanks, pumps, and propellers) used with the two-
component ink mixing system is 2 years; and therefore must be replaced at a cost of $25,000.
• The current ink application system requires a complete overhaul every two years at a cost of $1,000
to replace pumps, seals, and valves.
• Over a five year period the annual savings from the project are anticipated to remain constant at
$33,785 by off-setting increases and decreases in material purchase and waste disposal costs.
• Mars Screen Printing's financial advisors have determined that the value of money to the company
is approximately 3%, i.e. the discount rate, therefore the project must have a return on investment
of greater than 3%, which is equivalent to a net present value of zero.
Notes
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
Notes
The formula for NPV is:
Equation: NPV = I + [(AS - CE)l (PVE^ +(AS - CE)2(PVIF)2 +...+ (AS - C
where I = initial investment, start-up cost (expressed as a negative number)
AS = annual savings (cash inflows)
CE = capital expenses (cash outflows)
(AS - CE)i = net cash flow year 1
(AS - CE)2 = net cash flow year 2
(AS - CE)n = net cash flow year n
PVIF = 1/(1 +r)' = present value interest factor
r = discount rate of money (i.e., current rate of return)
t = incremental time period, 0 through n, normally expressed in years
A detailed explanation of how to use the equation is provided in Section 3.5.1, Common Methods of
Comparing Financial Performance. Using the additional information supplied about the proposed project for
Mars Screen Printing, a small cash flow spreadsheet was developed to calculate the NPV; see Exhibit 3.10.
Exhibit 3.10: NPV Calculation for Mars Screen Printing
Year
0 = 1
1
2
o
J
4
5
Annual Savings
(cash inflows)
NA
$33,785
$33,785
$33,785
$33,785
$33,785
Capital Expenses
(cash outflows)
- $75,000
$0
- $26,000
$0
- $26,000
$0
Net Difference
(net cash flow)
- $75,000
$33,785
$7,785
$33,785
$7,785
$33,785
PVIF
(DR=5%)
1.00
0.95
0.91
0.86
0.82
0.78
Net Present Value (NPV) = Sum of "PV Cash Flows" from Year 0 to Year 5 =
PV
Cash Flow
- $75,000
$32,176
$7,061
$29,185
$6,405
$26,471
$26,298
The net present value of the "environmentally friendly" ink project is estimated to be a positive
$26,298 over the life of the project for Mars Screen Printing, therefore, implementing this project is
anticipated to be a financially profitable endeavor.
3.6.2.7 Internal Rate of Return
The internal rate of return calculation is mathematically similar to the NPV calculation. Except, the
purpose of the IRR calculation is to determine the rate of return (r), the equivalent to the discount factor
which is known for the NPV calculation, and the NPV is set at zero.
In order to calculate the IRR for the substitution of "environmentally friendly" ink at the Mars
Screen Printing company the same information is used as for the NPV calculation, except for the discount
factor , which is unknown. The IRR equation is solved using an iterative process of trial and error to
determine the internal rate of return (r). The equation used to calculate the IRR is:
Equation: I + Cj (1/1+r) + C2 (1/1+r)2 +... + Cn (l/l+r)n = 0
where r = Internal Rate of Return (IRR)
I = initial cost
GI = net cash flow year 1
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Evaluation of Energy Conservation and Pollution Prevention Opportunities
C2 = net cash flow year 2
Cn = net cash flow year n
The first step is to develop a cash flow spread sheet, as in the NPV calculation, to determine the net
cash flow. The second step is to pick an initial IRR percentage (an educated guess) and calculate the present
value (PV) cash flow. The third step is to sum the PV cash flows for each time period to determine if it
equals zero. The process of choosing an IRR value is repeated until the sum of the PV cash flows equals
zero. Exhibit 3.11 demonstrates the iterative process to calculate the IRR for the Mars Screen Printing
project.
Exhibit 3.11: IRR Calculation for Mars Screen Printing
Year
0
1
2
3
4
5
Net Difference
(net cash flow)
- $75,000
$33,785
$7,785
$33,785
$7,785
$33,785
PVIF
(r = 5%)
1.00
0.95
0.91
0.86
0.82
0.78
Sum of "PV Cash Flows" =
PV
(r = 5%)
- $75,000
$32,176
$7,061
$29,185
$6,405
$26,471
$26,298
PVIF
(r = 20%)
1.00
0.83
0.69
0.58
0.48
0.40
PV
(r = 20%)
-$75,000
$28,154
$5,406
$19,552
$3,754
$13,577
-$4,556
PVIF
(r = 17%)
1.00
0.85
0.73
0.62
0.53
0.46
PV
(r=17%)
-$75,000
$28,876
$5,687
$21,094
$4,154
$15,410
$222
For the iterative process of calculating the IRR, a value of plus or minus $500 is normally
considered acceptable. Therefore, the internal rate of return for implementing "environmentally friendly"
ink at the Mars Screen Printing is calculated to be 17%. Mars Screen Printing should implement the
"environmentally friendly" ink project because the actual IRR, 17%, is greater than the company's required
5% IRR on all projects.
Notes
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Notes
Evaluation of Energy Conservation and Pollution Prevention Opportunities
REFERENCES
1. Federal Facility Pollution Prevention: Tools for Compliance; 1994, U.S. Environmental Protection
Agency. Office of Research and Development, Cincinnati, OH 45268. EPA/600/R-94/154.
2. Pollution Prevention Act of 1990
3. Facility Pollution Prevention Guide; 1992, U.S. Environmental Protection Agency. Office of
Research and Development, Cincinnati, OH 45268. EPA600R92088.
4. Energy Conservation Program Guide for Industry and Commerce: NBS Handbook 115; 1974, U.S.
Department of Commerce. National Bureau of Standards, Washington DC 20402.
5. Energy Conservation Program Guide for Industry and Commerce: NBS Handbook 115 Supplement
1; 1974, U.S. Department of Commerce. National Bureau of Standards, Washington DC 20402.
60 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Sources of Energy and Pollution
CHAPTER 4. SOURCES OF ENERGY AND POLLUTION
Renewable energy sources account for approximately ten percent of the U.S. annual energy
production. About half of this goes to generate electricity while the remaining half is used for transportation,
space heating, and water heating. Much research has been done in the area of renewable energy. In 1991, the
Solar Energy Research Institute located in Golden, Colorado was designated as the National Renewable
Energy Laboratory demonstrating a commitment to renewable energy technology.
Non-renewable energy sources supply the majority of energy in the U. S. Nuclear power plants generate
about twenty percent of electricity and Petroleum products, natural gas, and coal each supply twenty-five percent
of the total energy generated in the United States.
The generation of energy more often than not results in the generation of pollution in the form of air
emissions, ash, spent nuclear fuel or other wastes. Pollution is also generated from industrial, commercial, and
residential facilities throughout the nation. This chapter will discuss common sources of energy and sources of
pollution from industrial and commercial operations.
4.1 Electric Energy
During the 70's energy crisis, there was a drive, mainly from energy consumers, to conserve energy
and reduce costs because of the skyrocketing price of oil from the Middle East. These efforts began what is
today called demand-side management. DSM activities include customer load control, strategic conservation,
thermal storage, heat pumps, electrification, and innovative rate programs. These activities help the utilities
keep a balance between electricity supply and demand from customers.
Industry now spends more money on electricity than any other fuel source. The Assessment Team
continually monitors electrical usage in manufacturing processes to ensure the greatest amount of source
conservation, although electricity as compared to other production expenses appears relatively low. A large
amount of dollar savings can be realized through small changes in electrical consumption practices thus
producing a greater ratio between pounds of product to dollars of energy cost. Indeed, the industrial
assessment may reveal instances where substitution of energy sources indicates a greater amo unt of energy
used but lower energy costs incurred as in the case of natural gas conversions.
Cogeneration of electricity moves generative power out of the hands of regional utilities feeding
massive electrical grids into the hands of the company utilizing large amounts of heat and generating an
excessive amount of steam. This steam has been found to turn turbines as well as nuclear energy so instead
of venting waste heat into the atmosphere, electrical power is generated and either fed into the power grid or
sold directly to other consumers. Indeed, cogeneration has led to a new cottage industry- threatening to
cogenerate. A cash revenue stream provided by the utility and its rate payers can provide a major incentive
against cogeneration.
Providing electrical power will soon be no longer in the purview of the local or regional power.
Recent Congressional legislation intends to link producers and consumers from across the country. A
manufacturer in New York City will be able to buy Pacific Gas and Electric Power at a fraction of the current
Consolidated Edison price. Another cottage industry will spring up in the electrical brokerage business as
industrial consumers battle for the lowest price. No longer limited to large facilities, industrial manufacturers
will pay third parties to scout the markets for the lowest price or purchase computer software to electronically
perform the same function without the human overhead. Greater attention will have to be paid to the
formerly simple utility bills as rate structures and delivery mechanisms diverge leaving the manufacturer prey
to inconsistency potential heretofore unheard of. The utility assessment market will grow as will
opportunities for the industrial assessors prepared for the chaos.
There are five basic ways to reduce electric costs.
1. Reduce Electrical Use.
2. Power Factor Improvements.
3. Load Factor Improvements.
Notes
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Source of Energy and Pollution
JT , 4. Electricity Billing Verification.
5. Rate Structure Corrections.
Of these, only the first involves a reduction in energy consumption while the remainder detail some special
situations not directly related to the quantity of electricity consumed but rather the cost of consumption.
4.1.1 Reduce Electrical Use
The detailed use of electricity will be discussed under the separate sections in this manual, but the
conservation message can never be delivered too many times. Basically, electricity should be conserved, like
any other source, and not wasted as in the simple but common example whereby lights or equipment consume
energy during periods when rooms remain unoccupied or production lines experience downtime. Corrective
action requires cognizant, conscientious employees cooperating with energy-minded management to identify
areas of waste and suggest conservation practices.
4.1.1.1 Distribution System
The electrical power distribution system, from the source to utilization points, consists of electric
lines of varying sizes, switches and circuit breakers designed for carrying capacity maxima, transformers and
protective equipment. As related to the total consumption at any industrial plant, this system usually involves
losses of 3 percent or less. Consequently, rarely does any practical savings potential in transmission systems
appear to warrant investment in conservation.
The voltage in an electric circuit will drop in proportion to the circuit resistance. Resistance varies
with wire size, temperature and metallic material. Thus, as conductor losses increase, the current necessary to
deliver a given amount of power increases at any point in the circuit, as power derives from the product of the
voltage and current. This principle applies likewise to switches, circuit breakers, and protective equipment.
The question of energy conservation possibilities should be examined in relation to the individual
components in the system. In the case of the transmission lines it can be shown that doubling the conductor
sizes reduces resistance losses by 75 percent. However, savings do not usually justify the expense as
conductor cost in relation to the total electric investment only comes to about 10 percent. Because doubling
the conductor sizes essentially doubles cost, the savings potential deserves little attention.
As previously mentioned, energy losses from switches, circuit breakers, and protective equipment
also deserve minimal attention as replacement with more energy-efficient devices equalizes costs with
benefits. However, in the case of defective contacts or other parts, malfunction may cause overheating and
imminent failure of the part(s) causing an outage. Monitoring and inspection to diagnose abnormally high
temperature operation of these items will help prevent costly power outages and subsequent downtime.
Replacement with more energy efficient devices when failure occurs incrementally improves energy
conservation with little or no expense over normal, less efficient practices. To sum up, the distribution
system will offer few opportunities unless monitoring and replacement of parts before failure practices are
observed saving on future electricity costs and preventing expensive downtime.
Transformers do represent an area of potential savings during the condition of lightly loaded
equipment. Shrinking loads or incorrectly forecasted plant expansions often manifest themselves during
transformer examination by the Assessment Team. Unloaded motors incur no-load losses continually, as do
transformers, although newer model transformers adjust based upon loading conditions. Older transforms
incur continual power losses on the basis of full-load rating, not that of the load served. The Assessment
Team can investigate the possibilities of redistributing existing loads to permit scrapping of under-loaded
transformers. Implementation decisions must compare of the cost of installing new connecting cables and
disposal of existing equipment with power savings from the elimination of no-load transformer losses. For
the case involving older transformers disposal cost should be compared with not removing the equipment,
later removal and future growth of waste disposal costs, and the cost of emergency disposal if an explosion
damages the transformer. Close examination of the materials within the transformers for hazardous and
poisonous substances for inclusion in the energy conservation and pollution prevention write-up will help
present the entire picture and consequence scenario.
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Sources of Energy and Pollution
4.1.1.2 Use of Electricity in the Industry
Electrical energy use, commonly found in the following systems and operations, presents significant
opportunities for exploration during the industrial assessment.
• Mixing operations
• Melting and refining metallic and non-metallic materials
• Holding molten material
• Material Transportation
• Cleaning and finishing (air compressors)
• Miscellaneous assembly equipment
• Computers and other controls
• Material handling
• Packaging operations
• Environmental controls
• Lighting
• Heating, Ventilation, and Air Conditioning
4.1.2 Power Factor
Power factor quantifies the reaction of alternating current (AC) electricity to various types of
electrical loads. Inductive loads, as found in motors, drives and fluorescent lamp ballasts, cause the voltage
and current to shift out of phase. Electrical utilities must then supply additional power, measured in kilovolt-
amps (kVA), to compensate for phase shifting. To see why, power must be examined as a combination of
two individual elements.
The total power requirement constituents can be broken down into the resistive, also known as the
real component, and reactive component. Useful work performance comes from the resistive component,
measured in kilowatts (kW) by a wattmeter. The reactive component, measured in reactive kilo volt-amps
(kVAR), represents current needed to produce the magnetic field for the operation of a motor, drive or other
inductive device but performs no useful work, and does not register on measurement equipment such as the
watt meter. The reactive components significantly contributes to the undesirable heating of electrical
generation and transmission equipment formulating real power losses to the utility.
Power factor derives from the ratio of real, usable power (kW), to apparent power (kVAR). During
the industrial assessment recommendations toward reduction of the power factor in fact indicate reduction of
reactive losses. To accomplish this goal, the industrial electricity user must increase the power factor to a
value as close to unity as practical for the entire facility. The supplying utility should be consulted for the
determination of the requisite amount of capacitance necessary for correction to the desired power factor. For
example, The number in Exhibit 4.1 is multiplied by the current demand (kW) to get the amount of capacitors
(kVAR) needed to correct from the existing to the desired power factor. Mathematically, power factor is
expressed as
PF =
kW
kVA
Power factor can also be defined as the mathematical factor by which the apparent power is
multiplied in order to obtain active power.
Notes
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Source of Energy and Pollution
Notes
Exhibit 4.1: Components of Electrical Power
kW
o
• i-H
+-»
O
o
O
o
KS
o
•—
PLn
00
+-»
CO
• i-H
Xi
Example: Consider a 480 volt 3-phase system with an assumed load and instrument readings as
follows: the ammeter indicates 200 amps and wattmeter reads 120 kW. The power factor of the load can be
expressed as follows:
The apparent power for a 3-phase circuit is given by the expression
E x / x V? _ 480 volts x 200 amps x 1.73
1000
1000
Therefore:
= 166.08 kVA
PF =
kW
120
166.0!
. = 72.25%
From the above example it is apparent that by the decreasing power drawn from the line (kVA) the
power factor can be increased.
4.1.2.1 Power Factor Improvement
Preventive measures involve selecting high-power-factor equipment. For example, when
considering lighting, only high-power factor ballasts should be used for fluorescent and high intensity
discharge (HID) lighting. Power factor of so-called normal-power factor ballasts is notoriously low, on the
order of 40 to 55 percent.
When induction motors are being selected, the manufacturer's motor data should be investigated to
determine the motor power factor at full load. In the past few years, some motor manufacturers have
introduced premium lines of high-efficiency, high-power-factor motors. In some cases, the savings on power
factor alone can justify the premium prices charged for such motors. Motors should also be sized to operate
as closely as possible to full load, because the power factor of an induction motor suffers severely at light
loads. Power factor decreases because the inductive component of current that provides the magnetizing
force, necessary for motor operation, remains virtually constant from no load to full load, but the in-phase
current component that actually delivers work varies almost directly with motor loading.
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Sources of Energy and Pollution
Corrective measures for poor power factor involve canceling the lagging current component with
current that leads the applied voltage. This cancellation can be done with power-factor-improvement
capacitors, or by using synchronous motors. Capacitors have the effect of absorbing reactive current on a
one-to-one basis, because almost all of the current flowing through a capacitor leads the applied voltage by 90
degrees. A capacitor rated at 100 kilovolt-amperes capacitive (kVAC) will cancel 100 kilovolt-amperes
reactive (kVAR).
Synchronous motors provide an effective method of improving power factor because they can be
operated at the leading power factor. Moreover, power factor of a synchronous motor to serve a load with
actual power requirements of 1,000 kW, improves power factor on the load center from 80 percent to 89
percent. This improvement at the load center contributes to an improvement in overall plant power factor,
thereby reducing the power factor penalty on the plant electric bill. The burden on the load center, plant
distribution system, and entire electric-utility system is 400 kVA less than if an induction motor with a power
factor of 85 percent were used. Power factor can be improved still more by operating the synchronous motor
at the leading power factor.
Exhibit 4.2 can also be used to determine the amount of capacitors needed to correct a power factor.
The amount of capacitors needed in (kVAR) can be determined from:
WAR = DxCF
where
D = maximum annual demand, kW
CF = correction factor
Exhibit 42: Power Factor Correction
EXISTING
POWER FACTOR
0.66
0.68
0.70
0.72
0.74
0.76
0.78
0.80
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
0.98
0.99
NEW POWER FACTOR
1.00
1.138
1.078
1.020
0.964
0.909
0.855
0.802
0.750
0.698
0.646
0.593
0.540
0.484
0.426
0.363
0.292
0.203
0.142
0.95
0.810
0.750
0.692
0.635
0.580
0.526
0.474
0.421
0.369
0.317
0.265
0.211
0.156
0.097
0.034
0.90
0.654
0.594
0.536
0.480
0.425
0.371
0.318
0.266
0.214
0.162
0.109
0.055
0.85
0.519
0.459
0.400
0.344
0.289
0.235
0.183
0.130
0.078
0.026
0.80
0.388
0.328
0.270
0.214
0.159
0.105
0.052
0.75
0.256
0.196
0.138
0.082
0.027
Notes
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Source of Energy and Pollution
Notes
4.1.2.2 General Considerations for Power Factor Improvements
Poor power factor penalizes the user in three ways.
1. It robs the distribution system of capacity that could be used to handle the work-performing load.
2. It results in currents higher than necessary to perform a given job, thereby contributing to higher
voltage drop and electrical system losses.
3. It can result in electric power billing penalties depending on the schedule terms. A plant's power
factor penalty can be determined from the monthly utility bills. The method of billing for low power
factor varies widely among utilities. Often no penalty is imposed unless the power factor falls below
a certain minimum, typically 85 percent to 90 percent. In other situations, a penalty is involved for
any reduction below 100 percent. For this reason, each rate schedule must be studied separately to
determine the potential savings involved for improving power factor.
Some equipment, such as high power factor lighting ballasts or synchronous motors, has inherent
power factor improvement. With other equipment, notably induction motors, power factor is a function of the
mode of operation. Operation of an induction motor below full load will significantly reduce the power factor
of the motor. Therefore, motors should be operated close to full load for the best power factor. Power factor
also becomes progressively lower for slower speed motors. For example, the decline in power factor below
90 percent for a 1,200-rpm motor is 1.5 times greater than for an 1,800-rpm motor; for a 900-rpm motor, the
decrease is more than double that for an 1,800-rpm motor.
The use of power factor improvement capacitors is the simplest and most direct method of power
factor improvement. Capacitors can be bought in blocks aid combined to provide the required amount of
capacitive reactance or individual capacitors can be installed at each motor. Capacitors already in use should
be checked annually to ensure all units are operating. Inoperative capacitors negate the power factor
improvement for which their installation was intended. Diminishing returns are realized as power factor
approaches 100 percent. Generally, 95 percent (based on normal full load) is the economic break-even point
in a power factor improvement program; up to this point, improvements usually show a good return on
investment.
4.1.3 Electrical Demand / Load Factor Improvement
The plant's load factor should be analyzed to determine the opportunity for improvement. Load
factor improvement is synonymous with demand control.
Load factor is defined as the ratio of the average kilowatt load over a billing period to the peak
demand. For example, if a facility consumed 800,000 kWh during a 30-day billing period and had a peak
demand of 2,000 kW, the load factor is:
Load Factor = (800,000 kWh/720 hrs) / 2,000 kW = 0.55 or 55%
A high-load factor usually indicates that less opportunity exists for improvement because the load is
already relatively constant.
4.1.3.1 Potential Savings
The potential savings for demand limiting depends on such factors as:
• The plant's profile (Variations in kW demand.),
• The availability of sheddable loads, and
• The rate schedule.
Together these factors determine the relative importance of the demand charge to the plant's total
electric bill. Controlling demand becomes more important if the schedule includes a ratchet clause that
involves payment based on the highest peak occurring in the previous 12 months.
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4.1.3.2 System Analysis
The user will obtain the lowest electric cost by operating as close to a constant load as possible (load
factor 100 percent). The closer a plant can approach this ideal situation, the lower the monthly demand
charge will be. The key to a high-load factor and corresponding lower demand charge is to even out the
peaks and valleys of energy consumption.
To analyze the opportunity for demand reduction, it is necessary to obtain data on the plant's
demand profile. The demand profile is best obtained from the utility's record of the kW demand for each 15-
or 30-minute interval. If no demand recording is made as a routine part of the billing procedure, the utility
will usually install an instrument temporarily to provide the customer with this information. A plot of this
data will show the extent of the peaks and valleys and indicate the potential for the limiting demand. If sharp
peaks or an unusually high demand for one shift or short period occur, the opportunity for demand control
should be investigated further. If the demand curve is relatively level, little opportunity exists for reducing
demand charges by peak shaving.
In order to level out peaks in the demand profile, it is necessary to reduce loads at peak times.
Consequently it is necessary to identify the various loads that could be reduced during periods of high
demand. The major users of electricity will provide the most likely sources for limiting demand.
Accordingly, a list of the largest users, their loads, and their operating schedules should be prepared. The
smaller loads can be ignored, as they will not be able to affect the demand significantly. An examination of
this list will often suggest which loads do contribute or are likely to peak demands. When the load pattern is
not easily determined, a recording wattmeter can be installed at individual loads to provide a more detailed
record of load variations.
4.1.3.3 Ways to Reduce Demand
Consideration of demand control often begins with automatic demand controllers. However, several
other approaches should be considered first.
• Stagger Start-Up Loads - If a high-peak load is determined to result from the simultaneous start-up
of several loads, such as might occur at the beginning of a shift, consideration can be given to
staggering start-up of equipment to span two or more demand intervals.
• Reschedule Loads - Peak demands are usually established at particular times during the day shift. A
review of the operating schedule may show individual loads can be rescheduled to other times or
shifts to even out demand. This technique can provide significant gains at little or no cost. For
example, operation of an electric oven might be rescheduled to the evening shift if the oven is not
needed full-time. Another example is conducting routine testing of the fire pump during periods
when peak demands are not likely to occur.
• Increase Local Plant Generation - When some electricity is generated by the plant, plant generation
can be temporarily increased to limit demand. In some cases, any venting of excess low-pressure
steam from the turbo-generator for short periods may represent a lesser penalty than the increased
demand charge.
• Install Automatic Demand Control - After an investigating the above approaches, if an application
for automatic demand control still appears to exist, a more detailed analysis of conditions should be
made. The minimum peak demand that can be established will depend on the downtime that is
acceptable without undue interference with normal operations and the available sheddable load.
To determine the extent of downtime necessary to achieve a given kW reduction, it is necessary to
tabulate the size and frequency of peak demands. A sufficient number of months should be similarly studied
to develop a representative profile. Seasonal or production variations may also exist although it is likely the
variations in peak demands will remain relatively the same.
A suggested method of analysis is to tabulate the 10 to 20 highest peak demands occurring during a
typical month in descending order, as shown in the example given in Exhibit 4.3. In this case, limiting the
demand to the lowest value shown (5,990 kW) would reduce the electrical demand by 330 kW. The monthly
saving based on $9.40/kW would be $3,100, or on an annual basis, $37,200.
Notes
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Source of Energy and Pollution
Notes
Exhibit 43: Highest Demands for Hypothetical Billing Period of May
Date
May 10
May 24
May 14
May 5
May 20
May 15
May 15
May 8
May 9
May 13
May 5
Time
10:00a.m.
10:30a.m.
ll:00a.m.
l:30p.m.
2:30p.m.
10:30a.m.
10:00a.m.
2:00p.m.
2:00p.m.
l:30p.m.
2:00p.m.
kW
6320
6220
6145
6095
6055
6025
6010
6000
5995
5995
5990
kW Above
5990 kW
330
230
155
105
65
35
20
10
5
5
--
To effect this reduction requires a total sheddable load of at least 330 kW. If additional sheddable
loads are available, a greater reduction in peak demand can be considered. It should be noted that the task of
eliminating a peak becomes progressively harder as the demand limit is set lower because the frequency of
the peaks increases. For example, limiting the demand to 6,220 kW for a reduction of 100 kW from the peak
demand requires shedding a total of 960 kW for 30 minutes over 10 separate occasions. In other words, in the
second case it was necessary to shed a load almost three times longer for an equivalent reduction in demand.
As further limiting of demand is attempted, progressively longer periods of equipment outage are required. A
point is eventually reached where the interference with normal operation outweighs the benefits or no more
sheddable loads are available.
To determine the sheddable loads, review the list of the larger electrical loads which have already
been identified. These loads should be divided into two major categories.
1. Essential - Loads that are essential to maintain production or safety. Unscheduled shutdowns on
these loads cannot be tolerated.
2. Nonessential or sheddable - Loads in this category can be shut down temporarily without
significantly affecting operations or worker comfort. Examples of such loads are air conditioning,
exhaust and intake fans, chillers and compressors, water heaters, and battery charges. Electric water
heaters represent a load that can usually be shed.
The practical extent of peak shaving can now be determined based on the schedule of sheddable
loads and the pattern of peak demands. The number and type of loads to be controlled will determine the type
of demand controller needed. Automatic demand controllers are offered in a wide range of prices from
several thousand dollars to tens of thousands of dollars. For different applications, the more sophisticated
controllers may be necessary. For normal demand control, the less expensive controllers will be more than
adequate.
Annual savings can be calculated and compared to the costs of installing a demand control system.
As part of the installation, demand controllers will require a pulse signal from the utility to synchronize the
utility's demand interval with the demand controller's.
4.1.4 Reading the Bill
The cost of purchasing electrical power from utility companies is derived from four major factors;
energy charge, fuel-adjustment charge, demand charge, and low power factor penalty.
Other incidental items which will affect the power charges are character of service, service voltage,
and equipment charges. These are fixed charges.
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4.1.4.1 Example of a Typical Electric Bill
1. The utility rate schedule A-7 is the key to analyzing the electric bill. It is normally included as part
of the contract.
2. The energy used expressed in kilowatt-hours (kWh) is determined by the difference of two monthly
meter readings times the billing constant (2A). The billing constants (2A) and (3A) are also
described as "Meter Multipliers". They are determined by the product of the current and potential
transformer ratios installed at the particular location.
3. The reactive power used, sometimes called "wattless power", expressed reactive kilowatt ampere
hours (kVARh) is determined from a separate reactive meter similar to the kWh meter (2) above.
4. The maximum demand in kilowatts for the current month is read from a separate register on the kWh
meter. The value is the largest quantity of kilowatts consumed during a time interval prescribed in
the contract.
Exhibit 4.4: Example Electric Bill
Billing
Demand: 3840 ^-^
(2_A1 \2_ty
Billing kWh kVARh
Constants: 12000 12000
Maximum ^.^
Demand: 3840 ©
Kilowatt-Hour Meter
Service
From
05
g
To
06
25
Readings twh
From To
1352 1415 756,000
Total kWh 756,000
Reactive- Hour Meter
Service
From
05
©
Year
To
06
25
1979
Readings
From
0941
To
0981
Total kVARh
kVARh
480,000
480,000
Rate Schedule
Reactive (?)
Demand: 2438
Demand Customer or
f-
•\
A-7
(D
W Inclu. Sstate Tax @ 1 Cent/100 kWh
Service Charge: $3,615.70 (j\
Energy Charge: $29.010.3
3
Gross Bill: © $32,626.03
Voltage Discount: $706.77 Cr
Power Factor
Adjustments^ $266.3
Net Bill: (jj) $31,652.8
(T
8_Cr (l
8
)
Service Address
"9) Previous Balance
Deposit Refund
Amount Due:
$31,652.
(14)
88 v
The reactive demand in kVAR is calculated from the formula kVAR -
>. The billing demand is the avei
kW (kVARh/kWh).
age of the maximum demand for the past
11
months and the current
month's demand. The minimum is half of the past 11 -month value.
7. Date and time span of the current billing.
8. The service charge, as specified in the rate schedule, is based on the billing demand item 6 and the
service charge, is also used as the minimum billing if the energy usage falls to a low value.
9. The electrical energy charge is based on the kilowatt hours used as shown in item (2). Certain
adjustments are made to the energy charge determined from the meter readings as follows:
a) Energy cost adjustment known as "ECAC" varies with the change in fuel cost to the utility.
Notes
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69
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Source of Energy and Pollution
JT , b) Fuel balance factor is usually a credit.
c) Load management factor.
d) State tax as indicated on the mo nthly bill.
10. The gross bill is the summation of items (8) and (9).
11. The voltage discount is available for services that are metered on the high voltage or primary side of
the power company transformer. This discount is made to compensate for the utility transformer
losses which are now included in item (2).
12. The power factor adjustment may be a penalty or a discount depending on the amount of reactive
power, item (3), required by a plant. Power factor is defined as the ratio of the kW to kVA,
sometimes stated as the ratio of "real power to the apparent power". This value is not read directly
from the utility meters but must be calculated. A simpler method, using a hand calculator, is to solve
as a right angle triangle where power factor (PF) is:
pp=kW kWh
kVA RkVAh
RkVAh = (kWhJ + (RkVAh)2
PF
(756,000)2+(480,000)2
%PF = 100 x 0.849 = 85.9% Power Factor
On this rate schedule a power factor over 70.7% provides a credit; below a penalty, however, other
utilities may use a different break even point - 85% is used by many.
13. City taxes where applicable.
14. Net bill is the summation of all of the above charges, adjustments and credits.
4.1.5 The Energy Charge
Energy charge is based on the number of kilowatt hours (kWh) used during the billing cycle. The
total kilowatt hours are multiplied by the energy charge for total energy billing. The energy charges can vary
with the type of service, voltage, and energy consumption. Example energy rate schedules are as follows:
Example 1: General service schedule is applied to electrical load demand of up to 8,000 (kWh)
kilowatt hours per month. Thus a non-demand charge schedule, the cost of energy and demand are one
charge.
Example 2: Rate schedule A-12 is applied to electrical load demand of 30 to 1,000 kilowatt of
demand per month. This schedule has an energy charge, fuel-adjustment charge, demand charge, and low
power factor penalty.
Example 3: Rate schedule A-22 is applied to electrical load demands of 1,000 to 4,000 kilowatt of
demand per month. This schedule has an energy charge, fuel-adjustment charge, demand charge, and low
power factor penalty. The rate schedule has a "time of day" billing rate for energy and demand for both
summer and winter. The summertime hour periods are from May 1 to September 30; the energy and demand
charges change between the following hours:
Partial peak hours - 8:30 am to 12:30 pm = 4 hours
Peak hours -12:30 pm to 6:30 pm = 6 hours
Partial peak hours - 6:30 pm to 10:30 pm = 4 hours
Off peak hours -10:30 pm to 8:30 am = 10 hours
70 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Sources of Energy and Pollution
The wintertime hour periods are from October 1 to April 30; the energy demand charges change
between the following hours:
Partial peak hours - 8:30 am to 4:30 pm = 8 hours
Peak hours - 4:30 pm to 8:30 pm = 4 hours
Partial peak hours - 8:30 pm to 10:30 pm = 2 hours
Off peak hours -10:30 pm to 8:30 am = 10 hours
Example 4: Rate schedule A-23 is applied to electrical load demands of 4,000 and above 5 kilowatts
(kW) of demand per month. All other charges and "time of day" billing hours and periods are the same as
rate schedule A-22. Additional rates are available for the purchase of supply voltage of 4,500 or 12,000 volts,
this schedule provides for a high voltage discount of the total energy and demand charges.
4.1.6 The Demand Charge
This charge compensates the utility company for the capital investment required to serve peak loads,
even if that peak load is only used for a few hours per week or month. The demand is measured in kilowatts
(kW) or kilovolt amperes (kVA). These units are directly related to the amount of energy consumed in a
given time interval of the billing period. The demand periods vary with the type of energy demand; the high
fluctuating demand has a short demand period, which can be as short as five minutes, but generally demand
periods are of 15 or 30 minutes. The period with the highest demand is the one used for billing demand
charges.
Example: If the demand for a plant is 70 kilowatts for the first 15-minute period and for the next 15-
minute period the demand increases to 140 kilowatts and then drops back to 70 kilowatts for the remainder of
the billing period (one month), the billing demand for that month is then 140 kilowatts. This represents the
interval of maximum energy demand from the utility company for the month.
Demand charges can be a significant portion of the total electric bill; in some cases, demand charges
can amount to as much as 80 percent of the bill. The demand charge can be reduced by smoothing out the
peaks in energy demand by rescheduling of work or through a demand control program to shed loads when a
demand limit is approached. This concept is particularly important for plants using electricity for major
processes such as melting.
4.1.7 Power Demand Controls
The power demand controller automatically regulates or limits operation in order to prevent set
maximum demands from being exceeded. The role of such a power demand controller has been widely
recognized, the "time of day" billing rates will make it far more necessary in the future. The type of
controller best suited for a plant operation is that which will predetermine the demand limit and the demand
interval.
The overall usage of power is constantly monitored from the power company meter, the power usage
of all the controlled loads is also monitored. By having this information the controller can calculate when an
overrun of the desired demand limit will occur. The controller will delay any shed action to allow time for
loads to shed normally. When it is determined that it will be necessary to shed one or more loads to keep
from exceeding the demand, the controller, at the last possible moment, will shed the necessary loads. This
means that shedding will occur only once during a demand interval and maximum use of available power will
be realized.
4.1.8 Demand Shifting
Due to the lack of availability and the increased cost of natural gas and petroleum products, industry
has come to rely on electrical power as a major source of energy. The use of electrical energy has increased
at a greater rate than was anticipated and therefore a critical shortage has also been created in some areas.
Notes
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Source of Energy and Pollution
JT , This is particularly true during the normal working day hours. Over the past few years this condition has
caused situations known as "brown-outs", which is controlled curtailment of power.
Even with power companies doing their best to cope with the problem by building new generating
stations, installing additional equipment in existing facilities, and operating all equipment at maximum
capacity, they still have not been able, in some cases, to keep up with the rapid growth in the demand for
electrical energy.
The demand for electrical energy is not constant, but occurs in peaks and valleys. Power companies
are obligated to have enough equipment available to meet a customer's peak demand, even though this
equipment is only used during the peak periods and is not in use during most of the working day. In order to
finance the equipment necessary to provide this peak demand service for industrial users, the power demand
charge was created. In some localities this high demand rate is the rate, which is paid for the next year, even
if it is never reached again, and the price paid for power demand can be very high.
With peaks and valleys in electrical demand caused by electrical melting during the normal work
day, maximum demand peaks should be controlled by sequencing the furnace's operation and maximum
power input to each furnace. By applying this procedure, the revised operation would level out the peak
demands and produce a flat demand profile during normal daytime melting. With this melting operation the
"load factor" would be improved, thus preventing high maximum demand peaks, which are developed
through operating all machines at full load at the same time.
4.2 Fossil Fuels
Fossil fuels including petroleum products and coal supply about sixty percent of the U.S. energy
requirements. Petroleum products and coal are used in industrial boilers and power generation stations to produce
steam for manufacturing and electric generators. Domestic petroleum production is on a steady decline while the
U.S. has the largest coal reserves in the world. About ninety percent of domestic coal is used for electricity
generation.
Natural gas supplies a fourth of the U. S. energy needs. Natural gas use is expected to grow in the next
twenty years with most of this consumption met by domestic supplies. Natural gas is used in a variety of
operations such as steam generation, space heating, and cooking.
Fossil fuel generation and use creates a variety of wastes. The gaseous and particulate byproducts of
fossil fuel combustion include carbon dioxide, carbon monoxide, and nitrogen and sulfur oxides. The processes
used to treat the gases create other wastes. Water used in generating energy from fossil fuels is contaminated with
the chemicals used to control scale and corrosion. Before discharge, the water must be treated to remove these
contaminates. Burning fossil fuels creates solid waste in the form of ash and slag. In addition, the treatment of
waste gases and water causes the formation of solid waste.
4.2.1 Energy Conservation Measures for Fossil Fuels
In many ways energy conservation for fossil fuel usage is much less complicated and has a more
directly visible impact on the environment. Conservation opportunities can range from the very simple
opportunities like repairing steam leaks to more complex equipment replace projects. Common energy
conservation opportunities for fossil fuel using operations are included below.
• Monitor Air/Fuel Ratio - Monitoring the air/fuel ratio for boilers and other similar equipment to
ensure the optimum mixture will allow more efficient use of fossil fuels and reduce usage.
• Insulate Steam Pipes - Insulation of steam pipes will keep steam at the needed temperature allowing
the steam pressure to be lowered thus minimizing the energy needed to generate the steam.
• Repair Steam Leaks - Repair of steam leaks to minimize unnecessary steam loss will reduce the
quantity of fuel used to generate steam
• Preheat Combustion Air with Waste Process Heat - Use of waste process heat to preheat
combustion air for furnaces requires less fuel to heat the air to the needed temperature.
72 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Sources of Energy and Pollution
4.3 Alternative Energy Sources
Renewable energy sources account for approximately eight percent of the U.S. annual energy
production. About half of this goes to generate electricity while the remaining half is used for transportation,
space heating, and water heating.
Hydroelectric power generation comprises the largest percentage of the renewable energy category at
more than fifty percent. Hydropower generation is used primarily for generation of electricity. Electricity
generated from hydroelectric plants has increased as a result of increased water availability and improved
efficiency.
Solar energy comprises about one percent of the renewable energy. Solar energy is used in three
processes; heliothermal, heliochemical, and helioelectrical. Heliothermal is the absorption of the sun's radiation to
produce heat for processes such as water heating. Applications of heliothermal processes are called active solar
systems. Heliochemical solar energy is when the sun's radiation causes chemical reactions like photosynthesis.
Helioelectrical is the conversion of the sun's radiation into electrical energy. Application of helioelectrical
processes is usually termed photovoltaic systems. Solar energy can be accumulated in a number of solar
collectors, which vary according to application. Solar energy has cost constrains, but recently there has been a
resurgence in interest in solar energy, especially with environmental concerns.
Wind has been used for centuries as a power source to turn windmills for grinding grains and pumping
water. Due to the variability of wind, generation of electricity using wind turbines is fairly expensive, the more
wind the cheaper electricity generation. Energy generated from wind comprises less that half a percent of
renewable energy. The use of wind turbines is limited to those areas with a more constant supply of wind.
Geothermal energy generation, approximately five percent of renewable energy generation, is limited to
certain areas of the world where there are geysers, hot springs, or access to the earth's internal thermal energy.
Geothermal sources which are rich in hot water and steam from these sources is used to power low pressure
turbines to generate electricity either directly or through a binary process. The "direct process" is to use the
heated water and steam directly to power turbines while the "binary process" is to use a secondary fluid such as
freon to power the turbine.
Biomass fuels include a wide variety of materials such as wood, peat, wood charcoal, bagasse, biogas,
and liquid fuels produced by biological processes. Biomass fuels are the second largest source of renewable
energy generation at about forty-one percent. Wood materials are usually burned in fireplaces and boilers to
produce heat with little preprocessing. Wood charcoal is wood, which has been heated to remove most of the
moisture resulting in a higher BTU value. Peat is a material in the early stages of transformation to coal and is
generally low in sulfur, nitrogen, and ash. Peat, before harvesting, is greater than 90 percent water so drying is
necessary before use. Bagasse is a fibrous residue material from sugarcane processing and is burned in boilers
like wood. Biogas is generated from anaerobic digestion of waste materials. This gas is a useful source of energy
and the remaining sludge materials are used for fertilizer. Much research has been done on waste to ethanol
processes. These are biological processes that are used to generate liquid fuels. The waste to ethanol process is
not yet economically competitive with current energy sources and is not commercially practiced.
Municipal solid waste incinerators have increased in popularity over the past few years. Heightened
interest is a result of the closing of many landfills and the increasing capacity requirements for waste disposal.
There are hundreds of municipal solid waste incinerators in the U.S.
4.4 Pollution Prevention and Waste Generation
All of the above energy sources impact the environment either through emissions of pollution
causing materials, flooding of areas by hydroelectric dams, mining, or drilling. The U.S. has reduced energy
related air pollution through regulations requiring better emission control and cleaner fuels. In addition, other
wastes and pollution generated as the result of energy generation such as ash from the burning of solid waste
and other materials is also regulated. As these regulations become more stringent, pollution prevention and
waste generation from energy generating operations will be critical.
Notes
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Source of Energy and Pollution
4.4.1 Regulatory Requirements
Over the past three decades, the generation of wastes that are released to the environment through
any media have become more stringently regulated. Environmental compliance and waste management costs
increase in proportion to the number, volume, and complexity of a facility's waste streams. Simply stated,
the less waste a facility generates the lower the treatment and disposal costs; not generating wastes is the
wisest approach to waste management. This section gives an overview of major environmental requirements
the Assessment Team should refer to the Code of Federal Regulations or the U.S. EPA web site for specific
information on these regulations.
4.4.1.1 Air Emissions
The 1990 amendments to the CAA significantly affect facilities in several ways. Facilities located in
nonattainment areas may be subject to more stringent emission levels on existing permitted sources such as
painting/degreasing operations, power plants, or incinerators, and new regulations on many small sources that
were not regulated previously such as print shops, dry cleaning operations, and gasoline stations. The air
toxics provisions are likely to mandate new or additional control equipment for new and existing sources.
The list of air toxics to be regulated has grown beyond the original list of seven, to a new list of 189
substances. The expanded list of air toxics, coupled with the new provisions to reduce emissions in
nonattainment areas nation wide, means that many small sources typically found at facilities must now have
permits.
Sources of air emissions in industrial facilities include but are not limited to cleaning and degreasing
operations, painting or paint removal processes, heaters, furnaces, boilers, and printing. These operations are
common in many types of facilities. Control technologies are available to help reduce the release of regulated
emissions from many of these sources. For example, technologies available to reduce emissions from boilers
include low NOx burners and flue gas recirculation. In addition, many facilities have changed the types of
fuels that are used for boilers and furnaces to low sulfur fuels. For instance, conversion of boiler burners
from Fuel Oil No. 4 to Fuel Oil No. 2 would significantly reduce emissions.
4.4.1.2 Water Discharges
The primary regulation for wastewater management is the National Pollutant Discharge Elimination
System (NPDES), developed in accordance with the Clean Water Act. The CWA requires NPDES permits
for the discharge of pollutants from any point source into waters of the United States. Permits are required
for industrial facilities as well as facilities treating domestic wastewater. NPDES permits typically contain
limits on the quantities of specific pollutants that can be discharged from the facility. The NPDES permit
system encourages facilities to restrict their usage of regulated substances in order to comply with the
discharge limits.
EPA has established 34 NPDES Primary Industry Categories. Any permit issued to a facility
included in one of these categories contains specific effluent limitations and a compliance and sampling
schedule to meet the limitations. Technology-based treatment limits form the basis of most effluent
limitations.
The pretreatment program sets standards for the control of industrial wastewater discharged to
publicly -owned treatment works (POTWs). The goal of the pretreatment program is to protect human health
and the environment by reducing the potential harmful substances from entering POTWs.
Point source discharges are those that originate from a specific location such as an outlet pipe or
open channel that carries wastewater from sewage treatment or industrial process plants. Typically, all point
source discharges are required to have NPDES permits that specify the maximum quantity of toxins allowed
to be released. Point sources at facilities include photo labs, medical clinics, cafeterias, and electroplating
operations. Non-point source discharges are from operations such as agriculture, golf courses, and forest
operations.
4.4.1.3 Solid Waste
Municipal solid wastes, in general terms, include all items that are discarded and are, or could be,
taken to a sanitary landfill. According to an EPA report, the average office worker individually contributes
more than 100 pounds of high quality paper to landfills every year. Paper and paperboard products were the
74 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Sources of Energy and Pollution
largest components of municipal solid wastes by weight (37 percent) and volume (about 32 percent), totaling
nearly 66.5 million metric tons in 1990. Construction and demolition debris wastes accounts for more 25
percent of all municipal solid waste in the United States. The majority of these wastes are landfilled
Many State and local regulations prohibit the disposal of specific wastes at sanitary landfills.
Wisconsin, for instance, bans tires and used oil. The Assessment Team should refer to State or local
regulations for the most up-to-date landfill regulations.
Apart from regulatory incentives, the greatest incentive for applying pollution prevention to
municipal solid wastes is the cost savings from reduced disposal fees. In addition, recycling programs may
generate a small profit depending on local market conditions and the volume generated.
4.4.1.4 Hazardous Waste
The hazardous waste regulations promulgated to implement RCRA and the Comprehensive
Environmental Response Compensation and Liability Act (CERCLA) specify requirements for the
identification, storage, treatment, and disposal of hazardous waste. RCRA offers facilities four incentives for
pollution prevention.
1. Under the cradle to grave liability provisions, generators remain legally and financially responsible
for any environmental damage from their wastes from generation to disposal. In fact, generators
remain responsible for their wastes even after they have been disposed of (e.g., at a landfill).
2. As a result, hazardous waste management, treatment, and disposal costs have risen dramatically,
giving waste generators a financial incentive to produce the least amount of waste possible.
3. RCRA requires hazardous waste generators to certify that they have waste minimization programs in
place whenever they sign off on a manifest.
4. Generators are asked to voluntarily report their waste minimization achievements on the waste
minimization form of the Biennial Report, which they are required to file under 40 CFR § 262.41.
Sources of hazardous waste in industrial operations are abundant. An extensive list of these
operations is given in Exhibit 4.5. Pollution prevention opportunities for reduction of hazardous waste can be
as simple as better housekeeping or complex process or product modifications. Suggestions for common
pollution prevention opportunities are listed in the following sections.
4.4.1.5 Record Keeping
Industrial facilities are required to keep records to document hazardous waste generation, air
emissions, and water discharges. In some cases facilities are required to do regular monitoring of emissions
or discharges. Records for hazardous waste disposal are required by law to allow tracking of individual
substances according to the needs, should they arise. The record of movement of all hazardous substances
through the plant, from one manufacturing cell to another, or simply as a material flow, is a very useful tool.
It is always in the company's interest to deal with the issue of hazardous waste according to all the
regulations. The penalties for noncompliance are high, and in serious cases could even cause shutdown of the
operation. In the beginning of this manual it is emphasized that the industrial assessments are not compliance
audit and this holds true. But it is to the benefit of the company to be informed of the consequences of
noncompliance and the Assessment Team's job to help in solving problems related to waste and hazardous
waste in particular.
4.4.2 Sources of Manufacturing Wastes
Almost any operation will generate some type of waste or release pollutants to the environment.
Even a non-industrial type of a business will have a waste in terms of paper, cardboard, etc. If the waste is
landfilled, it is rather obvious that the space available is limited. If the waste is incinerated, a secondary
waste whether in the form of unwanted, though more acceptable, substances or at least heat is created. Waste
generators need to concentrate on source reduction, if that is not possible, recycling is the second choice, and
as the last resort, treatment of waste that will reduce the toxicity of the waste.
Notes
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Source of Energy and Pollution
Notes
4.4.2.1 Processes Generating Wastes and Types of Wastes Generated
In order to be able to deal successfully with any waste issues, the Assessment Team has to know
what usually constitutes waste and where and how it is generated. Nothing can be as valuable as personal
experience but even an inexperienced person performing the assessment can get a good idea from the
following list of waste materials for various operations.
Raw Materials
Processes
Cleaning
Painting
Machining
Printing
Containers, packing
Off-spec and expired lots
Cleaning
Reactions
Machining
Testing
Printing
Alkaline baths
Solvents
Sludges
Gnt
Thinner
Overspray
Containers
Paint stripper
Metal chips
Cutting coolants
Hydraulic oil
Filters
Lithographic plates
Silver
Press washes
Paper
Spoiled batches
Coating/Painting
Planting/Anodizing/Chromating
C asting/Molding
Extracting/Refining
Packaging
Acidic baths
Rags
Oil and Grease
Rinse water
Paint sludge
Filters
Unused paint
Masking
Trimming waste
Tapping oil
Tramp oil
Rags
Plate process solutions
Photo process solution
Rags
Inks
4.4.2.2 Industry Compendium of Processes Producing Waste
Processes that generate wastes can be categorized by the standard industrial classification (SIC) code
for easy of reference as shown in Exhibit 4.5. These processes are not limited to the industrial operations
classified into the given classification code but can be part of processes in other industrial facilities. The
assessment team should be aware that the opportunities listed may be applied to industrial operations in other
SIC codes.
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Exhibit 45: Compendium of Processes Producing Waste
General
Industrial
Category
Unit Operation
Common Waste Streams
Pollution Prevention Measures
Chemical
processing
(SIC: 28,29)
• Blending/mixing
• Reaction to form
product
• Vessel cleaning
Tank clean-out solutions
Tank clean-out solids
Reagent (liquid and powder)
spills to floor
Reaction by products
Air emissions- Dust from
powdered raw material
Use Teflon lined tanks
Clean lines with "Pigs" instead of solvents or aqueous solutions
Use squeegees to recover clinging product prior to rinsing
Use Clean In Place (CIP) systems
Clean equipment immediately after use
Treat and reuse equipment cleaning solutions
Use cylindrical tanks with height to diameter ratios close to one to reduce wetted
surface
Use tanks with a conical bottom outlet section to reduce waste associated with the
interface of two liquids
Increase use of automation
Convert from batch operation to continuous processing
Use dry cleaning methods whenever possible
Use squeegees, mops and vacuums for floor cleaning
Use pumps and piping to decrease the frequency of spillage during material transfer
Install dedicated mixing equipment to optimize re -use of used rinse and to preclude
the need for inter-run cleaning
Use in process recycling whenever possible
Install floating covers on tanks of volatile materials to reduce evaporation
Order paint pigments in paste form instead of dry powder to eliminate hazardous dust
waste
Food
processing
(SIC: 20)
Mixing/blending
Cooking/baking
Equipment cleaning waste
waters
Floor washing waste waters
Solid materials from mixer
cleaning (e.g. dough)
Spent cooking oils
Use dry cleaning methods whenever possible
Use high pressure washing equipment
Use squeegees and mops and for floor cleaning
Use continuous processing to eliminate the need for inter-run cleaning
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Source of Energy and Pollution
Exhibit 4.5: Compendium of Processes Producing Waste (cont.)
General
Industrial
Category
Metal
working
(SIC: 33-39)
Unit Operation
• Melting
• Casting
• Extrusion
• Cold working
(bending, pulling)
• Machining (cut-
ting, lathing,
drilling, tapping)
• Grinding
• Heat treatment
Common Waste Streams
• Air emissions
• Hazardous slag
• Non-hazardous slag
• Metal dust
• Scrubber sludge
• Spent sand
• Flashing
• Reject castings
• Scrap end pieces
• Scrap metal
• Metal scrap
• Spent hydraulic oils
• Spent lubricating oils
• Leaked oils
• Dirty rags or towels
• Metal and abrasive dust
• Air emissions
Pollution Prevention Measures
• Recycle non ferrous dust
• Alter raw materials to reduce air emissions
• Use induction furnaces instead of electric arc r cupola furnaces to reduce dust and
fumes
• Reuse high ferrous metal dust as raw material
• Use high quality scrap (low sulfur) to reduce hazardous sludge generation
• Use an alternative desulfurizing agent to eliminate hazardous slag formation
• Alter Product Requirements to eliminate unnecessary use of desulfurizing agent
(calcium carbide)
• Separate iron from slag and remelt
• Treat disulfurization slag in a deep quench tank in -stead of spraying water onto an
open pile to reduce air emissions
• Recycle casting sand
• Use sand for other purposes (e.g. construction fill, cover for municipal landfills)
• Avoid contamination of flashing and reject castings and reuse as feed stock
• Recover metals from casting sand
• Avoid contamination of end pieces and reuse as feed stock
• Recycle scrap metal to foundry
• Segregate metals for sale to a recycler
• Reprocess spent oils on site for reuse
• Install shrouding on machines to prevent splashing of metal working fluids
• Utilize a central coolant system for cleaning and re -use of metal working fluid
• Maintain machines with a regular maintenance pro -gram to prevent oil leaks
• Implement a machine and coolant sump cleaning program to minimize coolant
contamination
• Separate (flotation, magnetic) and recycle scrap to foundry
• Improve furnace control
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Exhibit 4.5: Compendium of Processes Producing Waste (cont.)
General
Industrial
Category
Unit Operation
Common Waste Streams
Pollution Prevention Measures
Printing
(lithography.
gravure,
flexography,
letterpress,
screen)
(SIC: 27)
Image production
Scrap film
Spent film processing
solutions
Use glass marbles to raise fluid levels of chemicals to the brim to reduce contact with
atmospheric oxygen
Recycle film for silver recovery
Use electronic imaging and laser plate making
Use water-based image processing chemicals
Closely monitor chemical additions to increase bath life
Use squeegees to prevent chemical carry-over in manual processing operations
Use counter current washing in photo processors
Recycle processing baths for nickel recovery
Use silver free films
Use "washless" processing equipment
Plate, cylinder
and screen
making
Spent plate processing
solutions
Use water-based developers and finishers
Use an automatic plate processor
Use counter-current rinsing to reduce rinse water volume (gravure)
Use drag-out reduction methods (gravure)-see surface coating
Sell used plates to an aluminum recycler
• Make-ready
Scrap paper
VOC emissions
Automate ink key setting system
Reuse scrap printed paper for make-ready
Use ink water ratio sensor
Computerized registration
Use automated plate benders
Printing
Scrap paper
VOC emissions
Damaged rubber blankets
Waste ink
Waste printing press oils
Install web break detectors to prevent excessive waste paper
Eliminate chemical etching and plating by using alternative printing technologies
(Presensitized lithographic, plastic or photopolymer, hot metal, or
flexographic)
Use a waterless plating system
Use automatic ink levelers
Schedule jobs to minimize the need for cleanup (light colors before dark)
Use dedicated presses for each color
Use less toxic solvents
Use soy or water-based inks
Automate ink mixing
Cover ink containers when not in use
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Source of Energy and Pollution
Exhibit 4.5: Compendium of Processes Producing Waste (cont.)
General
Industrial
Category
Unit Operation
Common Waste Streams
Pollution Prevention Measures
Printing
(lithography.
gravure,
flexography,
letterpress,
screen)
(SIC: 27)
continued
Clean-up
• VOC emissions
• Left over ink from fountains
• Waste roller cleaning solution
• Dirty rags
• Paint skin from open ink
containers
• Used plates
Use press cleanup rags as long as possible before
disregarding
Recycle waste ink and cleanup solvent
Use automatic cleaning equipment
Remove rollers from the machines and clean in a closed solvent cleaner
Prevent excessive solvent usage during cleaning (operator training)
Segregate spent solvents (by color) and reuse in sub-sequent washings
Improve cleaning efficiency by maintaining cleaning system (rollers, cleanup blade)
Surface
coating
(SIC: 24, 25,
34-39)
• Painting
Off-specification or out-dated
paint
Empty paint and solvent
containers
Paint sludge
Spent paint filters
Booth clean-out waste
(overspray)
Spent cleaning sol-vent
VOC emissions
Use tight fitting lids on material containers to reduce
VOC emission
Convert to higher efficiency technologies
Convert to electrostatic powder coating
Convert from water curtain spray booths to a dry system
Convert to robotic painting
Use low VOC or water based paint
Purchase high volume materials in returnable bulk containers
Train operators for maximum operating efficiency
Automate paint mixing
• Painting
continued
Use compressed air blowout for line cleaning prior to solvent cleaning
Shorten paint lines as much as possible to reduce line cleaning waste
Schedule production runs to minimize color changes
Recycle cleaning solvent and reuse
Use paint without metal pigments
Plating (electro
electroless-)
Anodizing
• Spent alkaline cleaning
solutions
• Spent acid baths
• Spent cyanide cleaning
solutions
• Spent plating solutions
• Filter sludge
• Waste rinse water
• Waste water treatment sludge
• Vent scrubber waste
Use high purity anodes to increase solution life
Lower the concentration of plating baths
Reduce drag-in with better rinsing to increase solution life
Use deionized water for make-up and rinse water to increased solution life
Extend solution life with filtering or carbonate freezing
Use cyanide free solutions whenever possible
Replace cadmium-based solutions with zinc solutions
Replace hexavalent chromium solutions with trivalent solutions
Return spent solutions to the manufacturer
Use lower concentration plating baths
Reduce drag-out by racking parts for maximum drainage
Reduce drag-out by slowing withdrawal speed and increasing drain time
Rack parts for maximum drainage
Use drain boards between tanks for solution recovery
80
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Sources of Energy and Pollution
Exhibit 4.5: Compendium of Processes Producing Waste (cont.)
General
Industrial
Category
Unit Operation
Common Waste Streams
Pollution Prevention Measures
Surface
coating
(SIC: 24, 25,
34-39) (cont.)
Reduce water use with counter current rinsing
Use fog nozzles over plating tanks and spray rinsing instead of immersion rinsing
Use reactive rinsing
Mechanically and air agitate rinse tanks for complete mixing
Use a still rise as the initial rinsing stage
Use automatic flow control
Recovery metals from rinse water (Evap., Ion ex-change, R.O., Electrolysis,
Electrodialysis) and reuse rinse water
Use precipitating agents in waste water treatment to reduce waste generation
Use separate treatments for each type of solution and sell sludge to a recycler
Surface
Stripping
(SIC: 24, 25,
34-39)
Stripping of
paint, varnish,
lacquer
• Spent solvents
• VOC emissions
• Spent caustic solutions
• Spent sand and other blasting
media
• Paint dust
Use mechanical stripping methods
Use cryogenic stripping
Use non-phenolic strippers to reduce toxicity associated with phenol and acid
additives
Maintain clean conditions before painting to avoid surface contamination resulting in
paint defects
Metal plating
removal
Spent acid solution
Tank sludge
Recover metals from spent solutions and recycle
Surface
preparation/
cleaning
(SIC: 24, 25,
34-39)
Chemical etching
Solvent cleaning
(vapor
degreasing,
solvent dip)
Spent acidic solution
Tank sludge
Waste rinse water
Spent solvents
Solvent recycle still bottoms
VOC emission
Solvent tank sludge
Reduce solution drag-out from process tanks
Prevent solution drag-out from upstream tanks
Use deionized water in upstream rinse tanks
Treat and reuse rinse waters
Recover and reuse spent acid baths
Use tight-fitting lids on material containers and sol-vent cleaning tanks to reduce
VOC emissions
Convert to aqueous cleaning system
Convert to less toxic hydrocarbon cleaners
Use peel coatings on raw materials to eliminate need for cleaning
Use water-based cutting fluids during machining to eliminate need for solvent
cleaning
Increase freeboard space and install chillers on vapor degreasers
Distill contaminated solvents for reuse
Remove sludge from tanks on a regular basis
Slow insertion and withdrawal of parts from vapor degreasing tankto prevent vapor
drag-out
Maintain water separator and completely dry parts to avoid water contamination of
solvent
Convert to aqueous cleaning
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Source of Energy and Pollution
Exhibit 4.5: Compendium of Processes Producing Waste (cont.)
General
Industrial
Category
Unit Operation
Common Waste Streams
Pollution Prevention Measures
Surface
preparation/
cleaning
(SIC: 24, 25,
34-39)
continued
• Use silhouette entry covers to reduce evaporation area
• Avoid inserting oversized object to reduce piston effect
• Allow drainage before withdrawing object
• Eliminate the need for cleaning with improved handling practices
• Aqueous cleaning
Spent cleaning solutions
Waste rinse waters
Oil sludge
Tank sludge
Remove sludge from tanks on a regular basis
Minimize part contamination before washing
Eliminate the need for cleaning with improved handling practices
Extend solution life by minimizing drag-in
Use alternatives for acid and alkaline (e.g. water, steam, abrasive)
Pre-inspect parts to prevent drag-in of solvents and other cleaners
Install mixers on each cleaning tanks
Closely monitor solutions and make small additions to maintains solution strength
instead of lathe infrequent additions
Implement a regular maintenance program to keep racks and tanks free of rust,
cracks, or corrosion
Apply a protective coating to racks and tanks
Reduce solution drag-out to prevent solution loss
Use counter current rinsing to reduce waste water
Use reactive rinsing to extend bath life
• Abrasive cleaning
Used buffing wheels
Spent compound
Use water based or greaseless binders to increase wheel life
Use liquid spray (water based) adhesive instead of bar abrasives to prevent over use
of material and easier part cleaning
Carefully control water level in Mass Finishing
Equipment
Dry and wet rag
cleaning
Spent solvent wetted rugs
Oil soaked rags
Wash and reuse rags on-site
Use an off-site rag recycling service
Minimize use of rags through worker training
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Sources of Energy and Pollution
Exhibit 4.5: Compendium of Processes Producing Waste (cont.)
General
Industrial
Category
Paper and
pulp
manufacturing
(SIC: 26)
Textile
processing
(SIC: 22)
Waste water
treatment
(SIC: 20, 22,
26,28,29,31,
33-39)
Plastic
formation
(SIC: 30)
Unit Operation
• Wood
Preparation
• Pulping
• Screening
• Washing
• Thickening
• Bleaching
• Stock preparation
• Paper machine
• Finishing and
• Converting
• Fabric weaving
• Milling
• Sewing
• Pressing
• Dying
• pH adjustment
• Filtration
• Mixing
• Flocculating
• Clarification
• Polishing
• Injection Molding
• Extrusion
Common Waste Streams
• Wood waste (saw dust, bark)
• Acid and Alkaline waste
waters
• Toxic waste waters
and sludges
• Wood fiber waste
• Non-hazardous waste water
treatment sludge
• Waste thread, yarn and
material
• Dye contaminated waste
water
• Treated effluent
• Hazardous treatment sludge
• Non-hazardous treatment
sludge
• Machine clean-out waste
(pancakes)
• Scrap plastic parts
• Plastic pellet spill to floor
• Spent hydraulic oil
• Oil-soaked absorbent
• Scrap end pieces
Pollution Prevention Measures
• Use diffusion pulp wash systems to maximize efficiency
• Maintain spray water temperature of 60- 70F to maximize rinse efficiency
• Employ a closed cycle mill process to minimize waste water production
• Reuse rich white water in other applications
• Use felt showers to minimize the amount of fresh water use
• Recycle white water
• Develop segregated sewer systems for low suspended solids, high suspended solids,
strong wastes, and sanitary sewer
• Improve process control to prevent spills of material
• Minimize overflows or spills by installing level controls in process tanks and storage
tanks
• Install redundant key pumps and other equipment to avoid losses caused by
equipment failure and routine maintenance
• Provide a storage lagoon before the biological treatment system to accept long-term
shock loads
• Replace the chlorination stage with an oxygen or ozone stage
• Recycle chlorination stage process water
• Use water from the counter current washing system in the chlorination stage
• Perform high consistency gas phase chlorination
• Market waste material as clean-up rags
• Recover dye from waste waters
• Use alternative flocculants to minimize sludge volume.
• Use filter a filter press and drying oven to reduce sludge volume
• Automatically meter treatment chemicals
• Minimize contamination of water before treatment
• Maintain machines with a regular maintenance program to prevent oil leaks
• Regrind and reuse scrap plastic parts
• Filter and reuse hydraulic oil
• Use and industrial vacuum for spill cleanup instead of absorbent
• Avoid contamination of end pieces and reuse as feed stock
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Source of Energy and Pollution
Exhibit 4.5: Compendium of Processes Producing Waste (cont.)
General
Industrial
Category
Unit Operation
Common Waste Streams
Pollution Prevention Measures
Plastic
formation
(SIC: 30)
continued
• Foaming
Fugitive air emissions
Stack releases
Scrap foam
Improved material handling (mixing and transfer) to avoid spills
Implement a regular maintenance program to reduce fugitive emissions from leaky
valves and pipe fit-tings
• Composite
materials
Empty resin and
solvent containers
Spent cleaning sol-vents
Waste wash-down water
Cleanup rags
Waste fabric
Gelcoat and resin overspray
VOC emissions
Waste resins
Resin and solvent
contaminated floor sweeping
Maximize production runs to reduce cleanings
Regenerate cleaning solvent on-site and reuse
Use less toxic and volatile solvent substitutes
Reduce transfer pipe size
Use more efficient spray method for gelcoat application
Modify material application methods to prevent material spillage
Cover solvent and resin container to minimize evaporative losses
Glass
processing
(SIC: 32)
• Melting
• Blowing
• Molding
• Scrap glass
• Contaminated
• granular raw materials
Avoid contamination of scrap glass and reuse as feed stock
Leather
processing
(SIC: 31)
• Tanning
• Finishing
Scrap leather material
Waste processing solution
Recycle spent tanning solution
Fastening/
joining/
assembly
(SIC: 24, 25,
27, 34-39)
Gluing (adhesive)
Mechanical
fastening
Welding
Part testing
Fluid filing
Used adhesive container
Adhesive solvent
air emissions
Dried adhesive
Shielding gas emissions
Metal slag
Gasoline (motor test)
Oil and grease spilled to floor
Spent clean-up rags or towels
Purchase adhesive in bulk containers
Use water-based adhesives
Use more efficient adhesive applicators
Use a rag recycle service
Reuse rags until completely soiled
Use rags sized for each job
84
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Sources of Energy and Pollution
REFERENCES
1. Federal Facility Pollution Prevention: Tools for Compliance; 1994, U.S. Environmental Protection
Agency. Office of Research and Development, Cincinnati, OH 45268. EPA/600/R-94/154.
2. Pollution Prevention Act of 1990
3. Facility Pollution Prevention Guide; 1992, U.S. Environmental Protection Agency. Office of Research
and Development, Cincinnati, OH 45268. EPA600R92088.
4. Energy Conservation Program Guide for Industry and Commerce: NBS Handbook 115; 1974, U.S.
Department of Commerce. National Bureau of Standards, Washington DC 20402.
5. Energy Conservation Program Guide for Industry and Commerce: NBS Handbook 115 Supplement 1;
1974, U.S. Department of Commerce. National Bureau of Standards, Washington DC 20402.
6. Annual Energy Review 1997, July 1998, U.S. Department of Energy. Energy Information
Administration, Washington, D. C. 20585. DOE/EIA-0384(97)
7. Electric Power Annual 1995, Volume I, July 1996, U.S. Department of Energy. Energy Information
Administration, Washington, D. C. 20585. DOE/EIA-0348(95)
8. Renewable Energy Annual 1997, Volume I, February 1998, U.S. Department of Energy. Energy
Information Administration, Washington, D. C. 20585. DOE/EIA-0630(97)
Notes
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Source of Energy and Pollution
Notes
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86 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Industrial Operations: Office Operations
CHAPTER 5. INDUSTRIAL OPERATIONS
Pollution prevention opportunities exist for a wide variety of industrial operations. The intent of this
chapter is to provide a resource for common pollution prevention techniques for a broad range of industrial
applications. The following twelve areas have been selected based on their widespread use in today's
industrial operations.
• Office Operations • Plating Operations
• Materials Management/Housekeeping • Paint Application
• Facility Maintenance • Paint Removal
• Metal Working • Paper and Pulp Manufacturing
• Cleaning & Degreasing • Commercial Printing
• Chemical Etching • Waste Water Treatment
A process description, waste description, and pollution prevention opportunities are provided for
each industrial operation highlighted. The information provided is not to be considered completely inclusive
of all processing steps or wastes generate, nor is its intent to be completely exhaustive of all pollution
prevention opportunities available to the reader.
5.1 Office Operations
Offices are the backbone of many industrial operations. Office personnel often handle
procurements, administrative issues, contracting issues, legal issues, and the design and implementation of
new procedures at industrial operations.
5.1.1 Waste Description
Office operations impact the amount of waste generated by industrial operations. Decisions made by
office operations effect pollution prevention plans, the type of materials purchased, the types of materials
disposed of, water usage, energy usage, paper usage, construction materials, demolition techniques, and
recycling plans.
Besides affecting the wastes produced by industrial operations, offices also often utilize high
amounts of energy and produce large quantities of waste through daily operations. Most of the office
operations energy is spent on electrical equipment such as computers, fans, printers, lights, and calculators
and HVAC equipment. Paper, cardboard boxes, and packaging materials usually compose the majority of
solid waste produced by an office.
5.1.2 Pollution Prevention Opportunities
Pollution prevention opportunities for office operations are classified according to the waste
management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-process)
recycling options.
5.1.2.1 Source Reduction
Source reduction offers a number of pollution prevention opportunities including:
• Water Conservation,
• Energy Conservation,
• Paper Reduction, and
• Construction and Demolition Waste Reduction.
These four source reduction techniques are explained in greater detail below.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 87
Notes
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Industrial Operations: Office Operations
JT , Water Conservation
Water conservation reduces pollution by reducing the demands on water and wastewater treatment
plants. This, in turn, reduces the energy requirements, chemical usage, and the potential for environmental
impacts from improperly treated wastewater effluent discharge.
Staff should request water usage statistics on a quarterly or monthly basis to track and identify
increases in consumption. As the facility implements specific water conservation activities, water usage
reductions can be documented.
The following list of water conservation strategies can be implemented to help reduce total water
usage.
• Retrofitting plumbing with water saving devices (including faucet aerators and low-flow toilets).
• Performing regular water system leak detection and repair activities.
• Altering landscaping activities to reduce water use, including planting species that require less water
(also known as xeriscaping) and reusing wastewater.
Benefits of Water Conservation
• Reductions in water use will reduce energy consumption and generation.
• Water conservation practices will create corresponding reductions in wastewater treatment, energy
requirements, chemical use, and effluent discharge.
• Reducing water usage can help reduce operating costs associated with both the purchases of water
and energy for water heating and treatment.
Limitations of Water Conservation
• Water saving devices can have higher capital costs than regular equipment.
• Re-landscaping a large facility can be a costly change.
Energy Conservation
A comprehensive facility audit or energy use tracking data can determine energy conservation
opportunities. Lighting, heating, ventilating, air conditioning, office equipment and other systems should be
examined. At many facilities, energy conservation strategies can be economically implemented with very
little capital costs.
Lighting costs can be drastically reduced by:
• Reducing lighting levels and the number of fixtures,
• Using energy efficient bulbs or fixtures,
• Turning off light switches when not in use,
• Installing motion sensors or timers to automatically switch lights off when an area is unoccupied,
• Replacing incandescent bulbs with fluorescent bulbs,
• Taking advantage of natural sunlight by using top-silvered blinds and light colored finishes to reflect
light, and
• Installing skylights in office areas.
Heating, ventilating, and air conditioning (HVAC) energy consumption can be reduced by:
• Keeping HVAC systems serviced;
• Setting core air temperature at the maximum allowable temperature for proper equipment cooling;
• Setting office thermostats to 68°F in winter;
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Industrial Operations: Office Operations
• Properly insulating walls, floors, and ceilings with weather stripping, caulking, storm doors, and
windows;
• Installing solar energy systems to reduce electric demand from HVAC systems; and
• Planting shrubs on the windward side of the building to block wind and decrease building heat loss.
Energy consumption by office equipment can be drastically reduced by:
• Considering energy efficiency when purchasing new equipment,
• Turning off electrical machines such as fans, typewriters, calculators, and copiers when not in use,
and
• Using Energy Star computer and copier equipment designed to go into a "sleep mode" when idle.
Other practices that facilitate energy savings include:
• Insulate hot water pipes, heating ducts and steam pipes. The cost for heating systems is directly
related to the heat they produce; this economic investment is wasted if the heat is allowed to radiate
from uninsulated pipes or duct work.
• Perform routine leak checks on pneumatic lines. High-pressure leaks often result from cracked lines
or loose fittings and can easily be detected with inexpensive leak detection equipment.
Benefits of Energy Conservation
• Energy conservation can help to reduce operating costs.
• Energy conservation reduces the demand for electricity and therefore smaller amounts of greenhouse
gases, heavy metals, boiler ash, scrubber residue, and spent nuclear fuel are produced.
Limitations of Energy Conservation
• Energy efficient systems often come with a higher capital cost.
Paper Reduction
A facility-wide program can encourage staff to reduce paper consumption. Posters should be placed
throughout the facility to remind and encourage staff to reduce their paper use. Some suggested methods to
reduce paper consumption include:
• Implementing a Facility-Wide Double-Sided copying Policy - In those offices that have copiers with
double-sided printing capabilities, personnel should be encouraged to make double-sided copies
whenever possible. Instructions on making double-sided copies should be placed near the copier for
ease and increased participation in the program. This practice reduces the generation of office paper
waste and can greatly reduce the amount of paper purchased.
• Expanding and Encouraging the Use of Electronic Mail - Staff members should be encouraged to
use electronic mail in place of paper memos and distribution copies.
• Identifying Opportunities to Reuse Paper and Paper Products - Corrugated cardboard boxes, jiffy
bags, manila envelopes and other packaging materials are reusable for their original function. In
addition, used paper can be reused as scrap paper.
• Using the Blank Side of Used Paper - Staff members should use the blank side of used paper for
items such as internal memos, notes, phone messages, and scrap paper.
Benefits of Reducing Paper Consumption
• Significant reduction in the amount of paper products purchased, thereby generating substantive cost
savings.
• Reduced solid waste disposal costs of bulky paper products such as coated cardboard boxes and
packaging materials.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 89
Notes
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Industrial Operations: Office Operations
JT , Limitations of Reducing Paper Consumption
There are no significant limitations to reducing paper consumption.
Construction and Demolition Waste Reduction
Although it may not be possible to modify existing construction contracts, the facility staff should
consider inserting language requiring recovery or recycling of construction and demolition debris to the
greatest extent possible, and include the language when negotiating future contracts.
Examples of typical construction and demolition debris that may be segregated for reuse or recycling
are: wood products, cardboard, glass, carpeting, carpet pads, plumbing, hardware, and insulated wire.
Construction and demolition debris can be reduced or recycled at the construction site and earlier
during the design and purchasing stages. For example:
• During the design stage, the contractor can select designs that utilize standard sizes (i.e., 8-foot
lengths) to reduce off-cuts of lumber and wallboard,
• Evaluate design plans to ensure the efficient use of materials, and
• Wood, wallboard and other biodegradable materials can be composted.
Waste can be reduced during the purchasing stage by:
• Improving the accuracy of estimating procedures to ensure that the correct amount of each material
is brought to the site, and
• Negotiating with suppliers to buy back unused materials. Ask for their assistance to identify
materials that contain the least amount of hazardous products. In addition, ask suppliers to deliver
supplies on returnable pallets and containers.
Waste can be reduced on-site by:
• Improving storage and handling procedures to reduce and prevent materials loss from weather and
other damage,
• Salvaging reusable items, such as windows and doors for remodeling projects, and
• Segregating wood, wallboard and other biodegradable materials and send them to a composting
facility.
Benefits of Construction and Demolition Waste Reduction
• Reduction in quantity of solid waste produced.
• Reduction in disposal costs.
Limitations of Construction and Demolition Waste Reduction
• Recycled materials may be more expensive than non-recycled.
• Separating waste from usable materials can be labor intensive and time consuming.
5.1.2.2 Recycling
Implement a Solid Waste Recycling Program
Many large facilities face the problem of low participation in the recycling program. Often large
amounts of recyclables are thrown away and non-recyclable materials are found in the recycling bins.
Improvements in the recycling program can often be made through the following activities.
• Establishing Written Recycling Program Guidance and Distributing to Section Heads/Process
Supervisors - Recycling awareness can be improved within the facility through a written program.
A written recycling program that clearly outlines materials that are recyclable, in what form (triple
rinsed, crushed, baled, etc.), and where to recycle will educate personnel to the opportunities
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Industrial Operations: Office Operations
available. Participation in recycling programs can be enhanced by through rewards and recognition
of personnel.
• Make Recycling Convenient - This can be accomplished by providing bins in all areas where
materials are generated. These bins can be purchased or can be fabricated using empty drums,
crates, boxes, wood, or metal depending on the material to be collected.
• Schedule Regular Collections - to insure that personnel will have sufficient space for their
recyclables. To do this, the facility engineer should work with the building managers to ensure they
routinely collect recyclables and place materials in the correct dumpsters marked for recyclables.
• Expand the Number of Waste Streams Recycled - by forming a regional alliance with other facilities
and private businesses in the local area or work with local recycling firms to expand services to
include new waste streams.
• Make Trash Disposal Less Convenient than Recycling - in order to reduce the amount of recyclable
material that is placed in trash containers. This can be accomplished by reducing the number of
trash receptacles in buildings, limiting access to trash dumpsters, or decreasing the frequency of
trash pickups. However, trashcans should not be too hard to find; otherwise the recycling bins will
fill up with trash. Placing trashcans and recycling bins right next to each other sometimes helps
reduce incorrect disposal practices.
• Institute a "Clear Bag" Program for Trash Pickup - A clear bag program requires facilities to
dispose of all trash in clear plastic bags. The waste disposal contractor visually inspects bags before
picking them up and does not pick up bags that contain recyclable materials. This places the burden
of recycling on the generator.
Benefits of Implementing a Solid Waste Recycling Program
• Reduces the mass of materials entering the waste stream and the associated disposal costs.
• The sale of recyclable materials can be financially rewarding.
Limitations of Implementing a Solid Waste Recycling Program
There are no significant limitations to implementing a solid waste recycling program.
5.2 Materials Management/Housekeeping
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve materials management and
housekeeping operations.
5.2.1 Process Description
Materials mangers have a chance to generate economic, safety, and environmental benefits within an
individual department as well as entire corporations. Efficient and effective materials management includes:
• Materials Purchasing • Materials Handling
• Materials Tracking • Materials Distribution
• Material Mixing • Packaging and Shipping Concerns
• Managing Materials Requirements • Minimizing On-Site Storage
• Spill Prevention and Clean-Up • Employee Training on Materials Concerns
• Improving Use and Reuse of Materials
The duties of materials management represent the heart of any effective waste reduction and
pollution prevention plan.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 91
Notes
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Industrial Operations: Materials Management/Housekeeping
Notes 5.2.2 Waste Description
The goal of any materials management program is to reduce the waste generated through materials
purchasing, handling, distribution, and clean up. Decisions about the purchasing of materials affect wastes
due to under- or over-purchasing and packaging wastes. Decisions affecting materials handling affect spills
and other losses. Distribution decisions affect the amount of waste generated due to spills and man-power.
Clean-up decisions affect the mount of waste released to the environment versus the amount properly
contained.
5.2.3 Pollution Prevention Opportunities
Pollution prevention opportunities for materials management/housekeeping operations are classified
according to the waste management hierarchy in order of relevance; first, source reduction techniques, then
secondly, (in-process) recycling options.
5.2.3.1 Source Reduction
Source reduction offers a number of pollution prevention opportunities including:
• Affirmative Procurement Program,
• Hazardous Material Control Centers,
• Bulk Fluids Distribution Systems,
• Automated Mixing Systems
• Packaging Design,
• Hazardous Materials Management,
• Spill Clean-Up Procedures, and
• Employee Education.
These eight source reduction techniques are explained in greater detail below.
Affirmative Procurement
Affirmative procurement refers to the purchase and use of materials containing recycled or
recovered content in the greatest amounts practical, given resource and performance constraints. The EPA
has established the Comprehensive Procurement Guidelines that identify categories of items to be purchased
with recycled content and the recycled content level these items should contain. EPA guideline items include
paper and paper products, retread tires, re-refined lubricating oil, building insulation, cement and concrete
containing fly ash, engine coolants, structural fiberboard, laminated paperboard, carpet and floor tile, patio
blocks, cement and concrete containing granulated blast furnace slag, traffic cones and barricades, playground
surfaces and running tracks, hydraulic mulch, yard trimmings compost, office recycling containers and office
waste receptacles, plastic desktop accessories, toner cartridges, binders, and plastic trash bags.
The facility should implement an affirmative procurement program. Typically, the steps to
implement an affirmative procurement program include:
• Obtain EPA's Comprehensive Procurement Guidelines,
• Distribute a list of affirmative procurement items to purchasing staff,
• Train purchasing staff on affirmative procurement,
• Identify items to be procured with various levels of recycled content,
• Develop and implement a tracking program to monitor compliance and progress.
When establishing the affirmative procurement program, purchasing staff must require that
vendors:
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Industrial Operations: Materials Management/Housekeeping
• Certify that the percentage of recovered materials to be used in the performance of the contract will
be at least the amount required by applicable specifications, and
• Estimate the percentage of total material utilized for the performance of the contract which is
recovered materials.
• Affirmative procurement requirements should be included in future construction agreements, so
contractors will have to use recycled materials in the beginning phase of building.
Benefits of Developing an Affirmative Procurement Program
• Purchasing products with recycled content "closes the recycling loop."
• Affirmative procurement programs help to ensure that there will be a viable market for recyclables.
Limitations of Developing an Affirmative Procurement Program
• Implementing an affirmative procurement program can be man-hour intensive to set-up, especially if
it is a new concept to the facility.
• Efforts have to be made to ensure that product quality and/or work efficiency are not comprised by
the use of materials comprised of recycled content.
Implement a Hazardous Material Control Center
Proper materials management can suppress chemical losses and spills thereby reducing costs and
waste stream outputs. Records of chemical purchases, inventory, bath analyses, dumps and additions, water
usage, wastewater treatment chemical usage, and spent process bath and sludge analyses must be kept in
order to gather an overview of an operations material balance and waste costs. From these records, data can
be gathered and used to determine the success of an overall minimization policy. Process-specific material
balance block diagrams can be drawn and shared with operators. These diagrams illustrate origins of waste
production clearly and can be used to re-engineer operations to reduce chemical loss.
Standardization of materials used throughout a facility can greatly reduce chemical inventory,
thereby reducing costs. Decisions to purchase one chemical rather than another must consider technical
requirements, environmental impacts, and cost.
The initiation of a facility-wide hazardous material control center (HMCC) will help reduce
hazardous material purchases and reduce the generation of hazardous wastes due to improper storage and
expiration of shelf life. One of the primary purposes of implementing an HMCC is to centralize the purchase,
storage, distribution, and management of hazardous materials (HM) throughout the facility, as well as to
allow for enhanced tracking of the movement of hazardous materials and wastes. The following concepts are
good building blocks for a successful HMCC program.
• Proper Coordination - can centralize the purchase, storage, and distribution of materials through a
single location within the facility. To do this, it is critical that the staff establishing the HMCC talk
with facility staff that use chemicals to document exact usage patterns of all materials. The end
result of the entire HMCC is to purchase only the amount of materials needed by each activity.
• Standard Operating Procedures (SOP) - are a set of written guidelines or standards for operating the
HMCC.
• Review and Approval - of the purchase of all materials that contain hazardous components should be
handled by the HMCC. A list of approved hazardous chemicals and applications should be
developed for each shop at the facility. Materials that are hazardous to human health or the
environment should require approval for each purchase. The HMCC should continually strive to
identify and purchase substitutes for these hazardous materials. This process would include the
evaluation of specific hazardous materials on an annual basis to determine if approved substitutes are
available.
• Inventory Tracking - can be improved by using a bar-coding system for all hazardous materials used
at the facility. The bar-coding system can be used to track the purchase and receipt of chemicals and
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JT , materials at the facility, as well as the requisition of chemicals from the HMCC area to individuals or
shops. Inventory tracking can also be improved with the aid of a tracking system.
• Inventory Controls - should be establish through central storage and inventory points for chemicals
and materials used in various locations at the facility. These storage points (or satellites) could
coincide with flammable lockers already bcated throughout the facility and could be used to store
the hazardous materials issued to each shop. Further, each satellite should maintain a written
inventory of materials that would be updated as materials are used and stocked. These inventories
would be cross checked against the computer tracking system to verify the location and usage of
materials purchased. Materials used could be stored (daily or weekly) after use.
• Purchase - of hazardous materials routinely used in large quantities should be available for quick
delivery.
• Review and Inspection - of procedures ensures proper usage of lockers and compliance with the
HMCC guidelines outlined by the facility.
Successful implementation of a HMCC will require that select facility personnel, particularly supply
personnel, receive specialized training in the administration of a HMCC. Furthermore, all personnel whose
jobs require the use of hazardous materials or result in the generation of hazardous wastes will require
training on how the HMCC will operate, why it was implemented, and what their roles and responsibilities
will be.
Benefits of Implementing a Hazardous Material Control Center
• A HMCC can identifying and quantifying the types and amounts of hazardous materials purchased
and used in order to create a baseline.
• Improves accountability, tracking, and control of hazardous materials.
• Reduces overuse of hazardous materials.
• Reduces occurrences of shelf-life expiration.
• Provides shops with the opportunity to return unneeded or unused requisitioned materials for use by
others.
• Ensures timely substitutions of accepted environmentally preferable products.
• Allows the purchase of some materials in refillable and/or bulk containers to reduce packaging
waste.
Limitations of Implementing a Hazardous Material Control Center
• Planning and organization requires extensive man-hours.
• Capital costs for computerized tracking systems can be expensive.
• Program requires all levels of staff acceptance to function properly.
Install a Bulk Fluids Distribution System
Bulk fluid distribution systems should be purchased and installed to significantly decrease material
costs. Typically, petroleum, oil, and lubricant (POL) products cost up to 30 percent less when purchased in
bulk rather than in quarts or gallons, and the labor required to triple rinse Sgal pails prior to disposal is
eliminated. Purchasing fluids in bulk also eliminates the costs associated with landfill disposal of non-
recyclable containers. Following installation of a bulk dispensing system, products should be purchased in
larger units of issue (i.e., 55-gal drums) and dispensed.
There are four basic types of bulk distribution systems including portable tank units, 55-gallon drum
pumps, bulk distribution racks, and overhead bulk distribution systems. The determination of which system is
appropriate is dependent on the volume of fluids dispensed per year and the space available to install the
equipment. The following is a brief explanation of each type of bulk oil distribution system and the
advantages of each.
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• Portable Tank Unit - consists of a 24.5-gal tank (oil dispenser), hose assembly (with 50 feet of hose),
and electronic control handle. Nitrogen gas (or an acceptable substitute) can be used to discharge
the oil from the tank. Pressurizing the tank eliminates the need for an external power source to operate
the pump (air, electricity). The unit can be mounted on a movable cart for use in various areas. The
portable tank is sealed and pressurized to eliminate the possibility of contamination of the oil t ank during
servicing of vehicles or machinery.
• 55-Gallon Drum Pump - connects directly to a 55-gallon drum and includes a trolley, air pump, bung
screw, connecting hose, hose reel, and control handle. The hose is 33 feet in length, but can be
rigged as long as 50 feet. The unit can also be equipped with stainless steel recoil hose reels, which
may be needed in colder climates. Manufacturers recommend ordering the system with an electronic
oil meter because they are much better than the older style mechanical meters and cost the same.
They also recommend using an air regulator inside the drum. This system works well in shops with
limited overhead space. Since fluid is dispensed from the same container as it is received, it
eliminates the possibility of spill during transfer of fluid from a 55-gal drum to a secondary
container.
• Bulk Distribution Rack - dispenses fluids from pre-set containers organized in a rack system. Each
container holds 65 gallons, and is equipped with a site glass to monitor stock levels. Fluid is gravity-
fed to a fixed dispensing point. A second container is required to transfer the fluids from the rack to
a portable container. The transfer pump removes the fluids from the original 55-gal container and
fills the container on the rack so there is no heavy lifting required. The number of containers and
size of the rack can be ordered to meet the specific needs of the shop area. The system works well in
shop areas with limited floor space. The downside of bulk distribution is that a small amount of
cross contamination of products may occur when switching transfer pumps from one fluid type to a
second.
• Overhead Bulk Distribution System - is custom designed to the user's specifications to dispense
fluids from transfer lines suspended above the shop floor. This system reduces labor costs by
placing commonly used fluids within the operator's reach. The volume of fluid dispensed can be
metered to achieve accurate volumes. Fluids are dispensed from a central location, either in the
maintenance area or in an adjacent room from 55-gal drums or storage tanks with air driven pumps.
Electronic tracking devices can be installed to monitor and record fluid usage. Typically air, grease,
hydraulic fluid, gear oil, motor oil, and antifreeze are dispensed with this system. The system
eliminates the labor required to retrieve the fluid product from a drum or dispensing rack.
Benefits of Installing a Bulk Fluids Distribution System
• Reduces disposal of empty containers.
• Cost savings associated with purchasing in bulk.
• Reduces loss of product.
• View windows on the fluid containers provide a constant reading of fluid amounts, so a shortage or
overstock of fluids is minimized or eliminated.
• Increased operating efficiency.
• Conservation of valuable shop floor space.
Limitations of Installing a Bulk Fluids Distribution System
• Cross contamination may occur when switching transfer pumps from one fluid to a second.
• Spills may occur when transferring fluids from a 55-gallon drum to a portable unit.
Minimize Packaging Waste Through Design
Without compromising health, safety, or product-integrity standards or violating regulatory
requirements, preferred packaging design practices should be implemented. Looking at total cost,
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environmental impacts and site-specific considerations is critical to making a competent decision. Preferred
packaging practices are discussed below.
• Reduce Packaging Size - to eliminate unnecessary solid waste. The ultimate goal of packaging
elimination is often not technologically feasible, but should be attempted, provided product integrity
will not be jeopardized. Computer aided design programs can be used to devise efficient systems to
protect and package almost any product. Besides reducing the amount of packaging entering the
waste stream, decreasing the packaging size can also reduce shipping, disposal, and raw material
costs.
• Environmentally Benign Materials - should be utilized whenever possible. Toxic, non-
biodegradable, and hazardous materials in the packaging often can be eliminated or reduced through
the use of environmentally friendly products. For example, items such as starch-based water-soluble
packing peanuts may replace environmentally detrimental non-biodegrade polystyrene packaging.
• Bulk and Concentrated Materials - should be utilized whenever possible. Products shipped in the
concentrated form are reduced in size, which reduces the amount of packaging required, while bulk
containers give more product with less packaging, therefore reducing the overall waste.
• Multi-Use Items - can reduce the mass of packaging material used by decreasing the total number of
items shipped. Reducing the number of items shipped also reduces shipping, disposal, and raw
material costs.
• Readily Recyclable Packaging - reduces the amount of manual labor required to prepare materials
for recycling, and insures that recycling is economically feasible. In order to create readily
recyclable packaging dissimilar materials such as foam and corrugated cardboard cannot be bonded,
and packaging is composed of as few materials as possible.
• Durable or Repairable Packaging - can reduce the mass of waste entering the waste stream. Items
such as broken wooden pallets or reels should be fixed whenever possible, or replaced with more
durable materials. Durable aid fixable items also save the cost of disposal and replacement of
packaging materials.
• Recycled Products - should be used in packaging whenever possible in order to complete the cycle.
Recycled packaging materials can work as well, if not better than, non-recycled products. The use of
recycled products is necessary for the recycling process to work.
Benefits of Minimizing Packaging Waste Through Design
• All packaging waste entering the waste stream is ended with packaging elimination.
• Packaging size reduction reduces shipping, disposal, and raw material costs.
• Environmentally benign materials can eliminate or reduce the amount of toxic, non-biodegradable,
and hazardous materials being produced and disposed of.
• Bulk containers give more product with less packaging, therefore reducing the overall mass of
wastes.
• Multi-use items can reduce the amount of packaging entering the waste stream by decreasing the
total number of items shipped.
• Durable or repairable packaging can reduce the mass of unnecessary packaging waste entering the
waste stream, disposal costs, and replacement costs.
• The use of recycled products is necessary for the recycling process to be profitable.
Limitations of Minimizing Packaging Waste Through Design
• Packaging waste elimination is not technologically feasible in most applications.
• Packaging redesign to reduce the size may be economically impracticable.
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• There may be many conflicts between competing goals, such as recyclability and cost reduction.
• Recycled packaging can be more expensive than new materials.
Improve Hazardous Materials and Waste Management, Secondary Containment, and
Labeling Procedures
Not only should substitutes be found and used in place of the hazardous materials, but also on-hand
supplies should be reduced. Ensure proper hazardous waste storage and labeling procedures are being
followed and train personnel to insure compliance with local, State, and Federal regulations. Containers used
to store hazardous waste (e.g., paint waste, batteries, waste flammable liquids) must be properly identified
with a hazardous waste label. The specific information required to be on the label includes the generator's
USEPA identification number, the words "hazardous waste", USEPA hazardous waste number, substance
name, and generation date or start/ending accumulation dates.
It is generally good practice to store other wastes (i.e., waste oil, waste antifreeze, used oil absorbent
pads) in well-labeled containers with secondary containment. It is also a good practice to make sure all
containers are labeled, especially if they contain hazardous materials. In addition, metal drums stored outside
should be covered so the integrity of the drums will not be compromised.
Benefits of Improved Hazardous Materials and Waste Management, Secondary Containment, and Labeling
Procedures
• Helps to avoid future liabilities from regulatory agencies.
• Reduces the potential generation of waste through mislabeling, improper storage and handling, and
exposure to weather.
• Reduces the quantity of hazardous waste generated.
• Reduces the reporting burden and cost of hazardous waste disposal.
Limitations of Improved Hazardous Materials and Waste Management. Secondary Containment, and
Labeling Procedures
There are no direct limitations to improving hazardous materials and waste management, secondary
containment, and labeling procedures.
Improve Spill Clean-up Procedures
All industrial operations should improve their spill prevention and cleanup practices to reduce waste
generation. This involves a hierarchy of options that are listed below.
• Use drip pans - to collect the fluids during the draining process and to collect minor drips and leaks
during servicing. This will prevent the leaks from dripping to the floor that will reduce the need to
use absorbent material or rags to clean the spills. This will also reduce labor time to clean the floors.
• Shop Vacuum for Oil Spills - provide the most environmentally sound way of managing uncontained
oil. This process ensures recoverability of the spilled oil for future recycling prospects. Several
vacuums are commercially available for use in wet or dry situations.
• Reusable pads and wringers - can be used to clean the spills and leaks. These pads are highly
absorbent and can be used several times 4 -10 before having to be disposed. Once the absorbent
pads are saturated with oil, the pads can be passed through a wringer that sits on top of a 55-gallon
drum which removes a large amount of the oil, allowing the pad to be reused. Facilities should
discuss what materials the reusable pads and wringer can be used with to avoid any safety issues.
• Collect and reuse dry sweep - if it is not possible to use absorbent pads. It is recommended that the
shops purchase or construct a dry sweep "sifter". This device is simply a mesh screen which filters
usable dry sweep from saturated dry sweep. The saturated dry sweep forms clumps that cannot pass
through the screen, whereas the unclumped, clean dry sweep can be reused. A small trap door
located at the bottom of the drum is then used to distribute the reusable dry sweep. Once the dry
sweep is spent, the dry sweep can be compacted. Compaction of spent sorbents can be accomplished
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JT , using mechanical compactors. Mechanical compactors compress liquids from the sorbent and also
serve to reduce the volume of the absorbent material such that a much smaller number of containers
are required for disposal. Mechanical compactors are typically designed to compact the contents of
drums, and may be fitted with pumps to transfer the liquid to a separate collection container.
Sorbents are typically not reusable after compaction.
• Hydrophobia Mops - have a high viscosity oil mop head composed of 100 percent polypropylene,
which makes it very effective at absorbing and containing oil spills. The advantage of using this type
of mop head is that it is water resistant and will absorb only oil if other materials (i.e. water, engine
coolant) are part of the spill. The mop can be reused up to 7 times or more before disposal.
• Reuse Rags and Absorbent Materials - to wipe, absorb, or clean-up spills. The rags should be
saturated with the substance before being laundered or disposed. Applicable materials include rags,
floor sweeps, absorbent pads, or any disposable towel. Designate two separate containers for
partially-used rags and saturated rags to be laundered or disposed. When finished cleaning a spill,
decide whether the rag is partially or entirely saturated and place it in the proper bin. Ensure that all
shops follow these procedures.
Benefits of Improved Spill Clean-up Procedures
• Reduces raw material costs and waste generation.
• Reduces labor time required to clean up unnecessary spills and leaks.
Limitations of Improved Spill Clean-up Procedures
• It is hard to predict leaks, so drip pan placement is difficult.
• Clean-up equipment can be expensive.
Employee Education
A high level of employee awareness and education is an essential part of any company's overall
pollution prevention program. The success or failure of specific procedures depends largely on employee
attitudes toward that policy. The employees must discern a company-wide effort supported at all levels of
management that affords the tools and data to ensure success.
Employee training should cover minimization or prevention of waste generation at the source,
routine process chemistry additions and sampling, handling of spills and leaks, and operating of pollution
prevention and control technologies. Background information should be available to employees, such as a
background of the applicable regulations, overall benefits to health and safety in and out of the workplace,
and overall cost of waste disposal before and after the successful implementation of waste minimization
procedures. This training should be integrated with normal operator training, and pollution prevention and
control procedures should be included in the written operating procedures of each process.
Benefits of Employee Education
• Can create enthusiasm about programs.
• Can reduce chemical usage and losses.
Limitations of Employee Education
• Requires extra man-hours for training.
5.2.3.2 Recycling
Recycling and reuse opportunities exist both on and off-site for facilities. Recycling and reuse have
innumerable benefits both financially and environmentally.
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On-Site Recycling
Internal Supply Reuse
Material reuse can be an environmentally friendly effective solution to excess materials. Reuse
curtails the flow of material into the waste stream, and does not require the energy necessary for recycling.
Disposal costs and packaging materials costs can als o be reduced through reuse. Packaging materials such as
barrels, crates, polystyrene peanuts, bubble-wrap, and cardboard boxes can be reused internally in many
operations. Packaging materials are often reused for storage, internal mail, internal freights, or shipping
product externally.
Benefits of Reusing Supplies
• Packaging reuse decreases the mass of materials entering the waste stream.
• Reduces the amount of toxic and non-biodegradable materials entering the waste stream.
• Decreasing mass of material entering the waste stream can decrease disposal costs.
• Raw material costs may decrease.
Limitations of Reusing Supplies
• Sources for unwanted materials may be difficult to find.
• Separating packaging materials for reuse can be time consuming and labor intensive.
Off-Site Recycling
Returnable Containers
Returnable containers (returnables) are containers that are shipped back to the original supplier when
empty. Examples include metal racks, rigid plastic racks, metal skids, returnable bins, and totes. Returnables
often contain expendable materials to protect the parts.
Returnables usually have a greater tare weight, which may increase transportation costs and have
negative ergonomic impacts if the containers are manually handled. If a part is changed significantly, the
returnable containers may have to be altered or completely changed at a relatively high cost. With a large
number of suppliers, plants may find returnables create a logistical problem requiring detailed tracking and at-
plant storage. Costs to return these containers may be large, especially if the containers do not break down or
nest and if the distance traveled is great. Returnables need periodic cleaning, repair, and maintenance, which
is an on-going expense. Returnables often have features such as "feet," ribs, or other protrusions that may
inhibit plant materials handling systems. Obviously, these containers do not require disposal, therefore use of
returnables avoids the ever-increasing expense. Despite some of the drawbacks mentioned, returnables are an
attractive option for many situations, especially if the suppliers are relatively close. Also, when damaged or
obsolete, the racks can be sold back to the manufacturer and recycled into new racks.
Benefits of Returnable Containers
• The initial costs for returnables can be recovered.
• Greatly reduces the mass of packaging materials entering the waste stream.
• Reduces land disposal costs.
• Racks can typically be recycled when damaged or obsolete.
• Racks are often composed of recycled material.
Limitations of Returnable Containers
• Returnable containers require a high initial investment.
• Logistical problem may require detailed tracking and at-plant storage.
• Costs to return these containers may be prohibitive.
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• Periodic cleaning, repair, and maintenance and an on-going expense to utilizing returnables.
• Design of returnable containers may inhibit handling systems.
• The added tare weight of returnables may increase transportation costs and have negative ergonomic
impacts if the containers are manually handled.
• Part changes can require that the returnable containers be altered or completely changed at a
prohibitively high cost.
Recycling Expendable Packaging
Expendable packaging is used once and then discarded or the material content is recycled. These
include corrugated boxes, shrink-wrap, styrofoam peanuts, wood skids, plastic, and metal banding.
Expendable packaging is lightweight and may reduce shipping costs. It can be easily modified if parts are
changed, which provides greater flexibility. Recycling of expendable packaging is a good option, but
involves internal labor to sort and handle. If the packaging is well thought out and the proper systems are in
place in a plant, sorting and handling costs can be greatly reduced. The markets for recycled materials must
be located and prices vary from location to location and from year to year. Expendable packaging may not be
suited near operations sensitive to fiber contamination or near ignition sources.
Benefits of Recycling Expendable Packaging
• Avoids some logistical problems since expendable packaging is not returned to the supplier.
• Avoids increasing disposal costs.
• Reduces mass of packaging material entering the waste stream.
• Expendable packaging has virtually no initial investment.
• The lightweight characteristics of expendable materials can reduce shipping prices.
Limitations of Recycling Expendable Packaging
• Markets for the recycled materials must be located.
• Recycling involves internal labor to sort and handle the expendable materials.
• Expendable materials are not suited for areas sensitive to fiber contamination or areas near ignition.
• The recycling market is highly variable.
Materials Management
Proper materials management can suppress chemical losses and spills thereby reducing costs and
waste stream outputs. The main methods of materials management are below.
Employee Education
A high level of employee awareness and education is an essential part of any company's overall
environmental program. The success or failure of specific procedures depends largely on employee attitudes
toward that policy. The employees must discern a company-wide effort supported at all levels of
management that affords the tools and data to ensure success.
Employee training should cover minimization or prevention of waste generation at the source,
routine process chemistry additions and sampling, handling of spills and leaks, and operating of pollution
prevention and control technologies. Background information should be available to employees, such as a
background of the applicable regulations, overall benefits to health and safety in and out of the workplace,
and overall cost of waste treatment before and after the successful implementation of waste minimization
procedures. This training should be integrated with normal operator training, and pollution prevention and
control procedures should be included in the written operating procedures of each process.
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Chemical Tracking, Inventory, and Purchasing
Records of chemical purchases, inventory, bath analyses, dumps and additions, water usage,
wastewater treatment chemical usage, and spent process bath and sludge analyses must be kept in order to
gather an overview of the shop's material balance and waste costs. From these records, data can be gathered
and used to determine the success of an overall minimization policy. Process-specific material balance block
diagrams can be drawn and shared with operators. These diagrams illustrate origins of waste production
clearly and can be used to re-engineer plating lines to reduce chemical loss.
Standardization of materials used throughout a shop can greatly reduce chemical inventory, thereby
reducing costs. Decisions to purchase one chemical rather than another must consider technical requirements,
environmental impacts, and cost.
Optimize Mixing Operations
Optimize mixing operations so that only the needed amount of materials is mixed. Limiting the
volume of chemicals mixed to the exact amount required to perform the job reduces the volume of excess
chemicals disposed per shift.
5.3 Facility Maintenance
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve facility maintenance activities.
5.3.1 Process Description
Facility maintenance assures that the facility is able to achieve a performance level consistent with
design and engineering. Maintenance personnel typically:
• Perform routine maintenance on machines,
• Maintain the facility grounds,
• Fix or replace broken parts, and
• Keep the facility and machinery clean.
5.3.2 Waste Description
Through daily tasks, maintenance personnel encounter many different waste streams. Potentially
hazardous lubricants, fluids, and filters are produced as a result of routine maintenance. Maintaining facility
grounds often produces large quantities of yard waste, and brings personnel in contact with potentially
hazardous chemicals. Fixing and replacing parts can produce wastes such as light bulbs, while keeping the
facility clean can produce large quantities of water.
5.3.3 Pollution Prevention Opportunities
Pollution prevention opportunities for facility maintenance operations are classified according to the
waste management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-
process) recycling options.
5.3.3.1 Source Reduction
Source reduction opportunities for facility maintenance exist for routine oil changes, ground
maintenance, and material substitution.
Establish an Oil Analysis Program
The quality of the oil from a facility's machinery should be tested before scheduled changes and
only changed when tests indicate that it is needed. There are two options to implement this opportunity:
(1) purchase oil analysis equipment, or (2) pay an outside company to test the oil. The cost for implementing
the oil-testing program will depend on the detail of analysis needed and the availability of facility personnel
to perform the tests. Acquiring the services of an outside vendor is generally more economically beneficial if
a detailed analysis of oil is needed. Often the more detailed the analysis needed the more economical it is to
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JT , have outside vendors perform the analysis. However, there is a time delay in obtaining results (1 day to 7-14
days) when an outside vendor is used.
Oil analysis equipment tests the physical and/or chemical constituents of the oil to determine its
quality level. There are two types of oil analysis -equipment that can be purchased to test the oil. The first is
a hand-held oil analyzer that provides limited information on the level of water and fuel contamination. The
second type of equipment is a PC-based program that uses a particle separator and viscometer to determine
oil quality. The parameters that are typically evaluated in determining oil quality include viscosity, total base
number (a measure of the oil's ability to neutralize acids), and the concentration of some metal ions (e.g.,
calcium, magnesium, phosphorus, sodium, and zinc), which are components of many additives. Regardless
of which system is purchased, operator training is minimal.
Benefits of an Oil Analysis Program
• Oil changes potentially reduced by 50% or more.
• Decreases the volume of oil and number of filters used.
• Reduces quantity of oil wastes and oil filter wastes.
• The manpower spent changing oil can be drastically reduced.
Limitations of an Oil Analysis Program
• Off-site testing can take as long as 14 days.
• Not following maintenance schedules can void equipment warranties.
Implement Environmentally Preferred Grounds Maintenance Practices
Many facilities have grounds maintenance activities on a daily basis that include landscaping, leaf
and brush removal, pesticide and fertilizer application, turf maintenance, lawn trimming and mowing.
Implementing the following pollution prevention activities can reduce the impacts associated with grounds
maintenance activities.
• Reduce/Eliminate Chemical Use - pesticides and herbicides wherever possible. The negative long-
term effects of the applications of these chemicals on the environment have been well documented.
In addition, improper use and mismanagement of chemical pesticides can result in human health
concerns. Over-mixing and over-application of landscaping chemicals leads to the generation of
unnecessary waste and environmental degradation. Application near environmentally sensitive areas
such as wetlands and tidal basins should be avoided.
• Practice Environmentally Sound Pesticide Management - use pesticides with low mobility, high
adsorption, and low persistence. Training employees in proper pesticide preparation, application,
and safe handling procedures to maximize product effectiveness and reduce the risk of accidental
spills. Use proper lawn care product application equipment and techniques to minimize excessive
spraying. Practice Integrated Pest Management (IPM) to minimize use of pesticides by utilizing
organic equivalents, beneficial insects and pest tolerant plant species. Practice strict inventory
control to prevent material expiration.
• Avoid Unnecessary Pesticide Use - through spot application practices. This practice ensures that the
smallest amount of chemical is applied to the ground and that the chemical is applied only in areas
where it is needed. Spot application reduces contamination of surrounding soil and local groundwater
supplies. Timely application ensures that applied chemicals do the most good when application is
needed. This includes applying chemicals at times when they are most likely to be absorbed by the
target species and not spraying in windy conditions or immediately before predicted precipitation
events, which could blow or wash the applied chemical into the surrounding environment.
• Employ Environmentally Sound Fertilizer Management - to avoid applying excess fertilizer. Use the
rates that are recommended for the product by the manufacturer. Understand the needs and growth
requirements of the plants, and use the minimum amount of fertilizer necessary to meet the plant
needs.
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• Replace Turfgrass with Native Plants - which are hearty and require low maintenance.
• Improve Mowing Practices - to reduce waste. Mowers should be set so that no more than 1/3 of the
lawn height (no more than 1 inch total) is removed with each mowing. Also, keep mower blades
sharp and leave grass clippings in place after mowing.
• Compost Yard Waste - and substitute it for organic matter such as mulch and topsoil, normally
purchased for grounds maintenance.
• Develop Standard Operating Procedures (SOPs) - and other outreach materials for contractors
and/or staff that are involved in grounds maintenance activities. SOPs and other materials should
describe and promote environmentally sound approaches to landscaping.
Benefits of Implementing an Environmentally Preferred Grounds Maintenance Practices
• Reduces the total solid waste disposal costs by decreasing the waste stream.
• Minimizes the hazardous waste stream by reducing potentially toxic fertilizer, pesticide, and
herbicide use.
• Potential hazardous waste disposal costs can be decreased.
• Reduces water usage, energy usage, and labor costs.
Limitations of Implementing an Environmentally Preferred Grounds Maintenance Practices
• Re-landscaping can be economically prohibitive.
• Outside contractors often handle facility maintenance.
Substitute Low Mercury Fluorescent Tubes for Standard Tubes
Low mercury fluorescent tubes can be directly substituted for many standard fluorescent tubes. The
mercury content of these tubes is much lower than standard tubes and the many of the tubes will meet TCLP
testing for non-hazardous waste.
5.3.3.2 Recycling
There are many recycling opportunities available to facility maintenance personnel. Recycling
programs can be utilized to recycle or reuse:
• Steel containers and Oil filters,
• Scrap Metal and Wood (pallets),
• Fluorescent light bulbs and Lamp ballasts,
• Shop towels,
• Antifreeze, and
• Wash water.
These recycling opportunities and their associated benefits and limitations are discussed in further
detail below.
Implement a Used Oil Filter/Steel Container Recycling Program
Used oil filters and steel containers, such as empty aerosol cans and paint cans are often disposed of
in the municipal solid waste stream, when they can be recycled. A comprehensive used steel container
recycling program for industrial and shop operations can reduce non-hazardous solid waste and
environmental liability from landfilling of containers that once contained petroleum based products. Used oil
is removed from oil filters either via crushing, shredding or dismantling for use in fuel blending operations,
waste to energy recovery, or oil reclaiming operations. The steel recovered from used oil filters, aerosol cans,
and paint cans, are crushed into dense cubes, and used by steel mills as a raw material.
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• Steel Container/Used Filter Recycler - should be able to handle several or all miscellaneous steel
waste streams in order to simplify the management oversight required to handle the contract, and
may allow the waste streams to be commingled at the point of generation for enhanced recyclability.
Certification that 100 percent of the waste stream received is recycled and cradle -to -grave tracking
to eliminate future liability from the waste stream are two important qualities to look for in any
recycler.
• Place Recycling Containers in Convenient Locations — such as near the point of generation is
important for increased recycling participation of any waste stream. The service contract established
with a steel recycler should provide timely removal of full containers.
• Awareness Training - is the key to any successful recycling program. Personnel must properly
understand what is and what is not recyclable, and where to recycle it. When personnel are unsure
of whether or not an item is recyclable, 9 out of 10 times it will end up in the waste steam. Monthly
updates in the newsletter and recycling posters promoting the recycling of new waste streams will
help educate personnel on proper procedures and an environmentally friendly alternative disposal
method to landfilling.
Benefits of Implementing a Used Oil Filter/Steel Container Recycling Program
• Recycling will reduce the quantity of solid waste generated by the facility.
• Disposal costs will be reduced.
• Sale of recyclable materials can be economically beneficial.
Limitations of Implementing a Used Oil Filter/Steel Container Recycling Program
• A recycling program is limited staff participation.
• A local recycler has to be able to handle the types and amounts of materials generated.
Establish a Recycling Program for Fluorescent Lights and Ballasts
Fluorescent and high-intensity discharge lamps contain mercury to conduct the flow of the electric
current. Historically, fluorescent lights have been discarded in landfills, where they can break and release
mercury into the environment. This potential hazard has caused many states to classify fluorescent light tubes
as hazardous waste and require that they be managed in accordance with applicable hazardous waste laws and
regulations. There are recyclers across the nation who accept fluorescent light tubes for recycling.
Lamp ballasts can also be recycled. Fluorescent lighting ballasts manufactured before 1980 contain
polychlorinated biphenyls (PCBs), which also have disposal problems associated with them. In fluorescent
fixtures, PCBs were usually found in ballasts within small capacitors or in the form of a black, tar-like
compound. The useful life of ballasts is approximately 1 5 years, so disposal of ballasts containing PCBs
should not be a problem much longer since ballasts produced after 1980 do not have PCBs. If a ballast is not
labeled "NO PCBs," it should be assumed that it contains PCBs.
Diethylhexylphthalate (DEHP) was used to replace PCBs in certain ballast capacitors beginning in
1979. DEHP is considered a human carcinogen. Ballasts designed for the following fixtures contained
DEHP: four foot fluorescent fixtures manufactured between 1979 and 1985; eight foot fluorescent fixtures
manufactured between 1979 and 1991; and high intensity discharge fixtures manufactured between 1979 and
1991 . To determine if a ballast contains DEHP, the manufacturer should be contacted or the capacitor should
be sent to a laboratory for tests.
Facilities are encouraged to manage all ballasts as hazardous because of the possible PCB or DEHP
content. Recyclers remove the PCB- or DEHP -containing materials for incineration or land disposal. Metals
can be reclaimed from the ballasts for use in manufacturing other products.
Fluorescent bulb recycling costs range from $0.06/ft to $0. 15/ft, not including packaging,
transportation, or profile fees. Disposal costs at a hazardous waste landfill range from $0.25-$0.50 per four
foot fluorescent tube and $0.33-$0.83 per ballast, not including packaging, transportation or profile fees.
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Recycling the light bulbs intact instead of crushing them at the facility is preferable in order to
reduce possible employee exposure to mercury vapors. After accumulating a number of tubes, the facility
should ship them to a vendor for recycling or arrange for a recycler to pick them up. Some vendors prefer the
lights be boxed in their original packaging; others provide special shipping boxes which comply with DOT
specifications. Lamp ballasts should also be recycled.
Fluorescent lights with lower concentrations of mercury should be purchased. A new low-mercury
fluorescent light tube became available in late 1995. The four-foot tube contains 10 milligrams of mercury
compared with 22.8 milligrams in currently produced lamps, down from an industry average of 38.4
milligrams per tube in 1990.
Benefits of Establishing a Recycling Program for Fluorescent Lights and Ballasts
Recycling spent fluorescent lighting tubes offers an environmentally sound alternative to solid or
hazardous waste disposal.
• Shipping the tubes intact reduces the risk of employee exposure to mercury.
• Permitting should not be required if tubes are sent for recycling.
Limitations of Establishing a Recycling Program for Fluorescent Lights and Ballasts
• Tubes must be collected until enough are collected to be economically efficient to send.
• All employees must participate in the recycling program.
Implement a Shop Towel Laundry Service
A facility-wide shop towel laundry program with a commercial laundry should be developed.
Industrial laundry services generally pick up the dirty shop towels and drop off clean ones each week. Most
laundries will accept all shop towels except those contaminated with hazardous waste. Depending on the
vendor, shop towels may be provided with the service.
Personnel should ensure that all shop towels are used to their maximum potential before sending
them to the laundry service to be washed. Extending the service life of the shop towels through improved
operating procedures can reduce program operating costs and reduce water consumption at the laundry.
Therefore, each shop should designate one container each for clean, used, and partially used shop towels.
Benefits of Implementing a Shop Towel Laundry Service
• Up to a 90% reduction in waste generation can be noticed with laundered towels versus disposable.
• Environmental liabilities associated with improper disposal practices are reduced.
Limitations of Implementing a Shop Towel Laundry Service
• Laundry services can be more expensive than disposable shop towels.
Establish an Antifreeze Recycling Program
Facilities should establish an antifreeze recycling program to recover used antifreeze. Facilities can
purchase either a bulk recycler for processing large amounts of antifreeze or smaller units that can
simultaneously filter fluid and flush cooling systems of machines, automobiles, and small trucks. Bulk
recyclers have a higher initial cost but lower operating costs than the smaller ones.
Currently, there are two popular reclamation systems. One system uses ion exchange and the other
uses vacuum distillation as the primary separation/purification process. These systems filter solids from the
spent antifreeze and remove the metal ion contaminants from the solution. The recovered coolant solution
often requires blending with an inhibitor package to restore it to its initial state. The two recycling systems
work with either ethylene glycol or propylene glycol, but each must be processed separately. These systems
are relatively simple to operate, compact (~4' x 4'), portable (on wheels or can be mounted on a trailer or
truck), and are easy to maintain.
The distillation system produces the larger quantity of waste residue. Residue production is
approximately 3 gallons of residue per 75 gallons of spent antifreeze. This residue is probably a hazardous
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JT , waste since the lead contamination is often greater than 5 ppm, but only a Toxicity Characteristics Leaching
Procedure [TCLP] analysis can determine whether the waste has this hazardous characteristic. The
manufacturer of this unit claims that a batch of accumulated residue can itself be processed to further reduce
the total volume of waste produced.
The ion exchange unit does not produce any liquid hazardous waste residue; however, it does require
filter replacement. Spent filters accumulate metals and may be considered hazardous waste if disposed. Once
the ion exchange filters are spent they must be shipped back to the manufacturer for regeneration. The spent
filters are not generally treated as a hazardous waste since they are re-used after regeneration and are not
disposed. This system is recommended.
Benefits of Establishing an Antifreeze Recycling Program
• Reduces purchasing, materials handling, and waste disposal costs.
• Reduces the mass of materials entering the waste stream.
• The recycling systems can be portable.
Limitations of Establishing an Antifreeze Recycling Program
• The residue from the distillation recycler may be considered hazardous waste.
Install a Wastewater Recycling System & High Pressure Low Volume Washers for Vehicles
and Equipment Cleaning
Facilities that regularly wash machinery or fleet vehicles should consider the installation of a wash
water recycling system. A wastewater recycling system, or recycling wash rack, removes oils, grease, soils,
and most other contaminants from the wash water through a closed loop system, greatly reducing the burden
placed on the oil water separators and the wastewater treatment plant. Additionally, water consumption from
washing operations can be reduced by an estimated 90 percent. Some systems require construction of an
inclined wash pad and installation of a submersible processing pump. If applicable, wash water from current
washing operations may need to be tested for metal concentrations to determine if a pre-metal isolation filter
for the system is necessary. Depending on the design of the model, an open pool of dirty water is visible.
High Pressure Low Volume (HPLV) washer options should be chosen when selecting the water
delivery system for each type of wastewater recycling unit. When combined with the wastewater recycling
unit, the total consumption of water can further be reduced. If HPLV washers are not available, they can be
purchased separately.
Benefits of Installing a Wastewater Recycling System & High Pressure Low Volume Washers for Vehicles
and Equipment Cleaning
• Water consumption and cost can be greatly reduced.
• The strain on the municipal wastewater treatment plant and oil water separators is reduced.
Limitations of Installing a Wastewater Recycling System & High Pressure Low Volume Washers for Vehicles
and Equipment Cleaning
• Water recycling equipment is expensive.
• Washing operations must be very high volume in order to be cost efficient.
• An open pool of dirty water may be visible with the recycler
5.4 Metal Working
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve metal working operations.
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5.4.1 Process Description
Metal working includes processes that machine, treat, coat, plate, paint and clean metal parts. There
are two major segments of the industry: pb shops that process materials owned by other parties on a
contractual basis, and captive shops that are part of larger manufacturing facilities. Metal fabrication
processes are integral parts of aerospace, electronic, defense, automotive, furniture, domestic appliance, and
many other industries. Metal working operations involve various metal cutting processes that include the
following.
• Turning • Threading • Polishing
• Drilling • Broaching • Planing
• Milling • Grinding • Cutting and shaping
• Reaming
Metal working processes use cutting tools of some sort that travel along the surface of the work
piece, shearing away the metal ahead of it. Most of the power consumed in cutting is transformed into heat,
the major portion of which is carried away by the metal chips, while the remainder is divided between the tool
and work piece.
Turning processes and some drilling are done on lathes, which hold and rapidly spin the work piece
against the edge of the cutting tool. Drilling machines are intended not only for making holes, but for
reaming (enlarging or finishing) existing holes. Reaming machines using multiple cutting edge tools also
carry out this process. Milling machines also use multiple edge cutters, in contrast with the single point tools
of a lathe. While drilling cuts a circular hole, milling can cut unusual or irregular shapes into the work piece.
Broaching is a process whereby internal surfaces such as holes or circular, square or irregular
shapes, or external surface like keyways are finished. A many-toothed cutting tool called a broach is used in
this process. The broach's teeth are graded in size in such a way that each one cuts a small chip from the
work piece as the tool is pushed or pulled past the work piece surface, or through a leader hole. Broaching of
round holes often gives greater accuracy and better finishing than reaming.
Metal working processes often apply a liquid (or sometimes gases) to the work piece and cutting tool
in order to aid in the cutting operation. A metalworking fluid is used:
• To keep tool temperature down, preventing premature wear and damage;
• To keep work piece temperature down, preventing it from being warped;
• To provide a good finish on the work piece;
• To wash away chips; and
• To inhibit corrosion or surface oxidation of the work piece.
Also, metalworking fluids are frequently used to lubricate the tool-work piece interface, in additional
to simply cooling it.
Metalworking fluids can be air-blasted, sprayed or drawn through suction onto the tool-work piece
interface. Types of fluids include water (either plain or containing an alkali); an emulsion of soluble oil; and
"straight" oils (those that are not water-based) such as mineral, sulphurized, or chlorinated oil.
Air drafts are often used with grinding, polishing and boring operations to remove dust and chips,
and to cool to a certain extent. Aqueous solutions containing approximately one percent by weight of an
alkali such as borax, sodium carbonate or trisodium phosphate exhibit high cooling properties and also
provide corrosion prevention for some materials. These solutions are inexpensive and sometimes are used for
grinding, drilling, sawing, and light milling and turning operations.
5.4.2 Waste Description
The major wastes from metal working operations are spoiled or contaminated metalworking fluids
and metal chips. The spent metalworking fluids are often treated as hazardous wastes because of their metal
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JT , and oil content, as well as other chemical additives such as chlorine, sulfur and phosphorus compounds,
phenols, creosols and alkalies. While fresh metalworking fluids contain varying degrees of oil depending on
their function, "tramp" hydraulic and lubricating oils also find their way into the fluids during the course of
operations. Spent metalworking fluids can be either disposed of or recycled on- or off-site. Metal chips can
be collected for recycling.
While metalworking fluid purchases typically account for less than 0.5 percent of the cost of
operating a machine tool, the problems that contaminated and degraded fluids can cause can be expensive and
troublesome. Proper coolant and cutting oil maintenance is necessary to prevent excessive machine tool
downtime, corrosion, and rancidity problems.
Rancid metalworking, perhaps the most common problem, can affect productivity and operator
morale. Rancid odors are produced in contaminated fluids due to bacterial action. The odors are especially
strong when machines are started up after periods of downtime. The odors are frequently unpleasant enough
that the fluid must be changed.
Insufficient maintenance of cutting fluids, especially water-based fluids, can result in work piece and
machine tool corrosion. Cutting fluids are needed to protect in-process parts from corrosion, but they will not
offer this protection if they have deteriorated due to rancidity, or if they are not maintained at the
recommended concentrations. Cutting fluids also must not be allowed to penetrate into gear boxes or into
lubricating oil reservoirs, or internal damage to machines can result.
Contamination of water miscible metalworking fluids by "tramp" lubricating and hydraulic oils
constitutes one of the major causes of fluid deterioration. The tramp oils interfere with the cooling effect of
the fluids, promote bacterial growth, and contribute to oil mist and smoke in the shop environment. Tramp
oils impair the filterability of metalworking fluids through both disposable and permanent media filters, and
thus inhibit recycling. Tramp oils also contribute to unwanted residues on cutting tools and machine parts.
A serious problem caused by tramp oils is the promotion of bacterial growth, primarily pseudomonas
oleovorans, in the metalworking fluid. Such bacteria degrade lubricants, emulsifiers and corrosion inhibitors
in the metalworking fluids, and liberate gases, acids and salts as byproducts of their growth. Bacterial growth
also interferes with the cooling effect of metalworking fluids.
The tramp oils that most contribute to bacteria growth are hydraulic oils (used in hydraulic assist
systems), due to their high water miscibility compared to lubricating oils, and to the phosphorus antiwear
compounds they contain, which catalyze microbe growth. Lubricating and machine ramp oils create fewer
problems, because their lower miscibility causes them to float to the surface of the coolant.
Solvent wastes resulting from cleaning of parts and equipment also comprise a sizable waste stream.
This waste stream is examined in Section 5.5, Cleaning and Degreasing.
5.4.3 Pollution Prevention Opportunities
Pollution prevention opportunities for metal working operations are classified according to the waste
management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-process)
recycling options.
5.4.3.1 Source Reduction
As identified in the Waste Description section, the primary problem in metalworking fluid
management is contamination with tramp oil and the problems that result from this. While the best solution
for tramp oil problems is to prevent the oils from entering the metalworking fluid, some contamination will
occur as the machines and their oil seals and wipes wear. This can be reduced through the following
activities:
• Preventive Maintenance Program,
• Improved Housekeeping Procedures, and
Fluid Selection.
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The following provides a brief description of each type of source reduction activity identified to
reduce waste metalworking fluid.
Preventive Maintenance Program
Preventive maintenance activities such as periodic seal and wiper replacement can extend the
working life of the fluid by preventing contamination with tramp oils. Metalworking fluid performance starts
with a preventive maintenance program that includes:
• Use of high quality, stable cutting and grinding fluids;
• Use of demineralized water for mixing purposes;
• Fluid concentration control;
• Control of fluid chemistry (pH, dissolved oxygen, etc.);
• Fluid contamination prevention;
• Periodic sump and machine cleaning;
• Period gasket, wiper and seal inspections and replacements to minimize tramp oil contamination;
• Regular cleaning of metalworking fluid through filtering or centrifugation, in order to minimize
microbe growth by controlling tramp oil buildup; and
• Assignment of responsibility for fluid control to one person.
A periodic schedule of metalworking fluid testing can also alert plant staff to deteriorating fluid
qualities in time to prevent failure of the fluid. Tests might include analyses for pH, specific component
concentration including additives, particulate matter, tramp oil, rust inhibitor, biocide concentrate, and
dissolved oxygen. Low pH values indicate low product concentrations, and thus related problems such as
increase in metal fines or other suspended solids, and heightened vulnerability to microbe growth and tramp
oil contamination.
Improved Housekeeping Procedures
An irritating problem in many shops is the contamination of fluids with trash such as cigarette butts,
food or food wrappers that find their way into sumps. Better housekeeping procedures, including operator
training and coverage of sumps with screens or solid covers, can help reduce this ongoing problem.
Fluid Selection
It is important to carefully select the metalworking fluid most suitable for the particular application,
in order to maximize performance and long fluid life. Fluid selection should be done from an overall, plant-
wide perspective, in order to find the best products as well as to minimize the number of different fluids in
use. With the broad applications of some high quality fluids, it is sometimes possible to employ only one
type in an entire plant, although different applications in the plant may require different proportions of water
and concentrate.
In order to make informed choices of fluids, it is important to know not only about the fluids' cutting
and grinding abilities, but also about factors such as their resistance to bacterial attack, the residues they leave
on machine tools and work-pieces, the corrosion protection they offer, the health dangers they present, such
as skin or respiratory irritation, and the environmentally hazardous chemicals they contain. For instance,
chemically active lubricants contain chlorine, sulfur or phosphorus may be used. Fluids can also contain
phenols, creosols, and harsh alkalies. Tramp oils often carry other hazardous contaminants into metalworking
fluid, and can lead to breakdown of the fluid and formation of hydrogen sulfide.
Use of synthetic metalworking fluids can sometimes result in dramatically increased fluid life.
Synthetic fluids are made up of chemicals such as nitrites, nitrates, phosphates, and borates. Synthetic fluids
contain only zero to one percent soluble oils in the fluid concentrate, compared to 30 to 90 percent soluble oil
in non-synthetic metalworking fluid concentrates. While the lubricity of synthetic fluids is lower than many
non-synthetic fluids, an advantage of synthetic fluids is that tramp oils are not able to contaminate them as
easily as non-synthetic fluids, because they are not able to readily enter the fluid emulsion, which leads to
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JT , breakdown of the fluid's qualities. Many synthetic fluids offer greater thermal stability at high temperatures,
resisting oxidation better than non-synthetic fluids.
Gases can sometimes be used in place of coolants, because they can cool work pieces and tools with
no work piece contamination. Air is the most frequently used gas, and is employed both in dry cutting and
with other fluids. Nitrogen and carbon dioxide are occasionally used as well, but their cost is high and
therefore their applications are limited.
Benefits of Source Reduction Opportunities for Metal Working
• Decreased waste generation from the cross-contamination of metal working fluids.
• Increased facility production from decreased down time to replace metal working fluids.
• Lower maintenance and labor costs associated with change-out and cleaning of metal working fluids.
• Reduced operating costs for new metal working fluids.
Limitations of Source Reduction Opportunities for Metal Working
• No limitations were identified.
5.4.3.2 Recycling
Recycling of deteriorated or contaminated fluids can reduce costly hauling and disposal charges.
Also, recycling will minimize the need for purchase of high priced fluid concentrates. While many shops
engage off-site recycling companies to handle their spent fluids, it is very feasible for larger shops to recycle
in-house. Off-site recyclers employ processes to separate oily wastes from water. The water is released to
the sewer while the oil is refined or used as fuel. In-house recycling typically focuses on extending the usable
life of metalworking fluids, rather than to separate and refine the oils it contains. Continuous in-house
filtration of fluids in machine sumps reduces the requirement for new fluids, avoids recycling charges, and
saves money by reducing machine downtime for cleaning and coolant recharge.
Methodologies for recycling metalworking fluids include:
• Gravity & Vacuum Filtration,
• Separation By Dissolved Air Flotation,
• Coalescing,
• Hydrocycloning,
• Centrifuging, and
• Pasteurization and Downgrading.
The following provides a brief description of each recycling method identified to reduce the disposal
of waste metalworking fluids. Each option can be employed either on-site or by an off-site contractor.
Gravity and Vacuum Filtration
In gravity pressure and vacuum filtration technologies, the waste coolant is passed through a
disposable filter to remove solid particles. Diatomaceous earth filters are also used at times, but their
adsorptive properties are so high that they can actually remove additives from a metalworking fluid. In
skimming separations, the metalworking fluid is allowed to sit motionless until immiscible tramp oil floats to
the surface, where it is manually removed or skimmed automatically using oil-attracting belts, floating ropes
or wheels. If the oil contaminants are fairly miscible, as is the case with hydraulic oils, or if the coolants in
the fluid have emulsified the oils, they will not rise to the surface on their own, and other separation
techniques must be used.
Separation by Dissolved Air Flotation
Separation of oil contaminants can sometimes be enhanced through dissolved air flotation. In this
method, the metalworking fluid waste stream is put under high pressure and air is injected. When the
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pressure is released, the air comes out of the solution, attaches to the oil and grit in the fluid, and floats it to
the surface, where it can be skimmed off.
Coalescing
In coalescing techniques, the fluid is brought into contact with an aleophilic ("oil loving") medium
formed into a high surface area shape such as corrugated plates or vertical tubes. Oil droplets impinge on the
media and cling to it, eventually coalescing to form large droplets that float to the surface of the fluid and are
skimmed off by adjustable weirs. Coalescers are not effective for removing water-miscible hydraulic oils or
emulsified lubricating oils, because they do not readily separate from the metalworking fluid.
Hydrocycloning
A hydrocyclone uses centrifugal force to separate solid contaminants from the fluid. Waste fluid is
pumped under pressure into the top of a cone-shaped compartment in which a vortex is set up. As the
spinning fluid accelerates down the cone, solids are forced to the outer wall. The solids move downward and
are discharged, while the clean fluid is forced by back pressure to move upward through the center of the
cone. Hydrocyclones can remove particles down to about 5 microns; they cannot, however, efficiently
remove small quantities of tramp oil. The advantage of this type of system is that it is mechanically very
simple and relatively easy to operate.
Centrifuging
Centrifuging involves mechanical rotation of the metalworking fluid, providing several thousand G's
of separating force. Centrifugation is able to remove hydraulic oils and other emulsified tramp oils as well as
"free" oils. Low RPM centrifuges are also used as "chip wringers" to separate reusable oil clinging to metal
chips.
Pasteurization & Downgrading
Another recycling method is the combination of pasteurization and low speed Centrifuging. While
this method is promising for certain applications, pasteurization is a tremendously energy intensive process,
and is only marginally successful in controlling microbe growth. Pseudomonas aeruginosa and
Pseudomonas oleovorans are two coolant-attacking bacteria that are notoriously hard to kill. Pasteurization
can also cause de-emulsification of oils, and if the metalworking fluid has degraded to the point where it has a
gray color and emits a hydrogen sulfide odor, pasteurization and centrifugation can only remove the odor and
color, but often cannot restore the fluid's lubricity and corrosion inhibition.
Used high performance hydraulic fluid that no longer fulfills exacting specifications can often be
downgraded and employed as cutting oils. For instance, certain mil spec hydraulic oils cannot be employed
in their original application once their viscosity has dropped due to polymer shearing, but if the oils have been
kept clean, additives can be mixed into them to make excellent metalworking fluids.
Benefits of Recycling Metal Working Fluids
• Decreased waste generation from the reuse of metal working fluids.
• Increased facility production from decreased downtime to replace metal working fluids.
• Lower maintenance and labor costs associated with change-out and cleaning of metal working fluids.
• Reduced operating costs for new metal working fluids.
Limitations of Recycling Metal Working Fluids
• Potentially high capital cost depending on the required quality level for the fluid.
• Additional maintenance and labor expense to maintain and operate the recycling equipment.
5.5 Cleaning & Degreasing
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve cleaning and degreasing operations.
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5.5.1 Process Description
Cleaning and degreasing processes are applied in a variety of industries to remove dirt, soil, and
grease (often referred to together as soil). Cleaning and degreasing are done as a final step in manufacturing
a product, as a preliminary step in preparing a surface for further work (e.g., electroplating), or as a cleaning
step for forms or equipment between uses.
In preparing metals for finishing, the cleaning process is the most important. Finishing processes
depend on a clean surface as a foundation. In selecting a cleaning operation, the process to be performed, as
well as the type of metal and contaminant, are important considerations.
Many parts manufacturers clean their own products, whereas others send them out to companies
with the sole business of parts cleaning. Currently, the common cleaning processes for metals include liquid
solvent cleaning (cold cleaning) and vapor degreasing. Liquid solvent cleaning usually is done in large tanks
containing solvent solutions in which the parts are immersed. This usually is an automated process. Vapor
degreasing generally involves chlorinated solvents such as methylene chloride, 1 , 1 , 1 -trichloroethane,
trichloroethylene, or perchloroethylene. Parts are immersed in the vapors of these solvents for degreasing. In
the dry cleaning industry, perchloroethylene is commonly used for washing clothes.
In the electronics industry, parts generally are cleaned after soldering to remove contaminants.
These contaminants originate from the fluxes used to promote the wetting necessary for good solder joints to
be formed. The flux residue can interfere with future processes and reduce the aesthetics and reliability of a
part. Traditionally, chlorinated, fluorinated, and other halogenated solvents have been used to remove these
residues.
5.5.2 Waste Description
Cleaning and degreasing technologies generally involve applying some form of a solvent to a part.
Solvents are used in virtually every industry to some extent. During the cleaning process, there is often an
environmental problem with air emissions from the solvents. After the cleaning process, a waste stream
composed of the solvent combined with oil, debris, and other contaminants is left for disposal.
Halogeneated solvents, which are known for their stability, ease of drying, and effectiveness in
removing oils, have detrimental environmental effects. Solvent evaporation has been investigated for its role
in stratospheric ozone depletion, global warming potential, and ground smog formation.
Using halogeneated solvents to clean and degrease not only generates hazardous solvent wastes but
also create work conditions that may be detrimental to the health and safety of workers. Questions
concerning safety and health issues include chronic and acute effects, carcinogenicity, and teratogenicity.
Because environmental laws restrict the use of such solvents, many industries are attempting to
reduce or eliminate their use of halogenated solvents. Additional restrictions can be expected in the future.
5.5.3 Pollution Prevention Opportunities
Pollution prevention opportunities for cleaning and degreasing operations are classified according to
the waste management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-
process) recycling options.
5.5.3. 1 Source Reduction
Cleaner technologies now exist or are being developed that would reduce or eliminate the use of
solvents for many cleaning and degreasing operations. There are two main focuses in describing cleaner
technologies for cleaning and degreasing:
• Alternative Cleaning Solutions - (e.g., aqueous-based) can directly replace existing solvents with little or
no process modifications.
• Process Changes - use different technologies for cleaning or eliminate the need for cleaning. The capital
costs may be greater for process changes, but the reduced cost of buying and disposing of solvents often
makes up for this.
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Both alternative cleaning solutions and process changes may have limitations that should be
carefully evaluated by potential users for their specific applications.
Alternative Cleaning Solutions
Alternative cleaning and degreasing solutions are non-ozone depleting or lower ozone depleting
substances that are non-hazardous; have low toxicity, low odor, and high flash points; produce low emissions
of volatile organic compounds; and are effective for removing contaminants. Alternative cleaning solutions
present a sound option to reduce or eliminate the use of hazardous cleaning and degreasing chemicals from
the workplace through source reduction.
The following seven common alternative cleaning solutions are presented below: (1) aqueous
cleaners, (2) semi-aqueous cleaners, (3) petroleum hydrocarbons, (4) hydrochlorofluorocarbons (HCFCs), (5)
miscellaneous organic solvents, (6) supercritical fluids, and (7) carbon dioxide snow.
Exhibit 5.1 describes each available cleaner technology. It lists the pollution prevention benefits,
reported application, operational benefits, and limitations of each technology to allow preliminary
identification of those technologies that may be applicable to specific situations.
Aqueous Cleaners
Aqueous cleaning and degreasing can be performed for a wide variety of applications, including
those that once were considered the domain of vapor degreasing or cold solvent cleaning. However, some
ferrous metals may exhibit flash rusting in aqueous environments; therefore, such parts should be tested prior
to full-scale use.
Many kinds of aqueous cleaning products are available. Thus, some investigation is required to find
cleaners that are most effective against the contaminants typically encountered and to find cleaners that give
the best performance with the process equipment that will be used. Whereas solvents depend largely on their
ability to dissolve organic contaminants on a molecular level, aqueous cleaners utilize a combination of
physical and chemical properties to remove macroscopic amounts of organic contaminants from a substrate.
Aqueous cleaning is more effective at higher temperatures, and normally is performed above 120°F using
suitable immersion, spray, or ultrasonic washing equipment. For this reason, good engineering practices and
process controls tend to be more important in aqueous cleaning than in traditional solvent cleaning to achieve
optimum and consistent results.
When switching from solvent cleaning to aqueous cleaning, one should be aware that parts usually
need to be rinsed and will remain wet for some time unless action is taken to speed up the drying process.
The ability of aqueous cleaners to remove most contaminants has been demonstrated in numerous
tests. Aqueous cleaners are capable of removing inorganic contaminants, particulates, and films. They also
exhibit considerable flexibility in application because their performance is strongly affected by formulation,
dilution, and temperature. The formulation that gives the best results can be found through some
investigation, and the user can select the dilution factor and temperature that give the best results.
Benefits of Aqueous Cleaners
• The primary pollution prevention benefit of aqueous cleaners is that they are non-ozone depleting
and may not contain VOCs.
• Aqueous cleaners that are non-hazardous initially remain so unless they become contaminated with
hazardous materials during cleaning operations.
• In some cases, spent cleaner can be treated to remove contaminants, which may allow them to be
discharged to sewers, provided that the effluents meet local discharge requirements.
• Aqueous cleaners are nonflammable, therefore, there is no risk of fire.
• Aqueous cleaners are available in a wide variety of formulations, strengths, and materials
compatibility properties.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 113
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Exhibit 5.1: Available Technologies for Alternatives to Chlorinated Solvents for Cleaning and Degreasing
Technology Type
Pollution Prevention
Benefits
Reported Application
Operational Benefits
Limitations
Aqueous Cleaners
• No ozone depletion
potential
• May not contain
VOCs
• Many cleaners
reported to be
biodegradable
Excellent for removing
inorganic and polar organic
contaminants
Used to remove light oils
and residues left by other
cleaning processes
Used to remove heavy oils,
greases, and waxes at
elevated temperatures
(>160°F)
• Remove particulates and films
• Cleaner performance changes
with concentration and
temperature, so process can be
tailored to individual needs
• Cavitate using ultrasonics
Nonflammable and nonexplosive,
relatively low health risks compared
to solvents; consult Material Safety
Data Sheet (MSDS) for each cleaner
Contaminant and/or spent cleaner
may be difficult to remove from
blind holes and crevices
May require more floor space,
especially if multi-stage cleaning is
performed in line
Often used at high temperatures
(120 to 200°F)
Metal may corrode if part not dried
quickly; rust inhibitor may be used
with cleaner and rinsewater
Stress corrosion cracking can occur
in some polymers
• Some have low vapor
pressure and so have
low VOC emissions
• Terpenes work well at
low temperatures, so
less heat energy is
required
• Some types of cleaners
allow used solvent to
be separated from the
aqueous rinse for
separate recycling or
disposal
Semi-Aqueous
Cleaners
High solvency gives cleaners
good ability for removing
heavy grease, waxes, and tar
Most semi-aqueous cleaners
can be used favorably with
metals and most polymers
NMP used as a solvent in
paint removers and in
cleaners and degreasers
Rust inhibitors can be included in
semi-aqueous formulations
Nonalkaline pH; prevents etching
of metals
Low surface tension allows semi-
aqueous cleaners to penetrate
small spaces
Glycol others are very polar
solvents that can remove polar
and nonpolar contaminants
NMP used when a water-miscible
solvent is desired
Esters have good solvent
properties for many contaminants
an are soluble in most organic
compounds
NMP is a reproductive toxin that is
transmitted dermally; handling
requires protective gloves
Glycol ethers have been found to
increase the rate of miscarriage
Mists of concentrated cleaners
(especially terpenes) are highly
flammable; hazard is overcome by
process design or by using as water
emulsion
Limonene-based terpenes emit a
strong citrus odor that may be
objectionable
Some semi-aqueous cleaners can
cause swelling and cracking of
polymers and elastomers
Some esters evaporate too slowly to
be used without including a rinse
and/or dry process
May be aquatic toxins
114
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Exhibit 5.1: Available Technologies for Alternatives to Chlorinated Solvents for Cleaning and Degreasing (cont.)
Technology Type
Pollution Preve ntion
Benefits
Reported Application
Operational Benefits
Limitations
Petroleum
Hydrocarbons
• Produce no wastewater
• Recyclable by
distillation
• High grades have low
odor and aromatic
hydrocarbon content
(lowtoxicity)
• High grades have
reduced evaporative
loss
Used in applications where
water contact with parts is
undesirable
Used on hard-to-clean
organic contaminants,
including heavy oil and
grease, tar, and waxes
Low grades used in
automobile repair and related
service shops
No water used, so there is less
potential for corrosion of metal
parts
Compatible with plastics, most
metals, and some elastomers
Low liquid surface tension
permits cleaning in small spaces
Flammable or combustible, some
have very low flash points, so
process equipment must be designed
to mitigate explosion dangers
Slower drying times than
chlorinated solvents
The cost of vapor recovery, if
implemented, is relatively high
Hydrochloro-
fluorocarbons
(HCFCs)
• Lower emissions of
ozone-depleting
substances than CFCs
• Produce no wastewater
Used as near drop-in
replacements for CFC-113
vapor degreasing
Compatible with most metals
and ceramics, and with many
polymers
Azeotropes with alcohol
used in electronics cleaning
Short-term solution to choosing
an alternative solution that
permits use of exis ting equipment
No flash point
Have some ozone depletion
potential and global warming
potential
Incompatible with acrylic, styrene,
and ABS plastic
Users must petition EPA for
purchase, per Section 612 of CAAA
Miscellaneous
Organic Solvents
• Do not contain
halogens, so they do
not contribute to ozone
depletion
• Most are considered
biodegradable
• Generate no waste-
water when used
undiluted
Most are used in small batch
operations for spot-cleaning
Alcohols are polar solvents and
are good for removing a wide
range of inorganic and organic
contaminants; soluble in water
and may be used to accelerate
drying
Ketones have good solvent
properties for many polymers and
adhesives; they are soluble in
water and may be useful for
certain rapid drying operations
Vegetable o ils are used to remove
printing inks and are compatible
with most elastomers
Lighter alcohols and ketones have
high evaporation rates and
therefore dry quickly
Most evaporate readily and therefore
contribute to smog
Alcohols and ketones have low flash
points and present a fire hazard
Inhalation of these solvents can
present a health hazard
Some have vapor pressures that are
too high to be used in standard
process equipment
MEK and MIBK are on EPA list of
17 substances targeted for use
reduction
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
115
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Industrial Operations: Cleaning & Degreasing
Exhibit 5.1: Available Technologies for Alternatives to Chlorinated Solvents for Cleaning and Degreasing (cont.)
Technology Type
Pollution Prevention
Benefits
Reported Application
Operational Benefits
Limitations
Supercritical
Fluids (SCFs)
• Nonpolluting when
CO2 is used as the
supercritical fluid
• Generate no
wastewater
• Use natural or
industrial sources of
CO2, so no net
production of carbon
Remove organic
contaminants of moderate
molecular weight and low
polarity
Precision clean instrument
bearings, electromechanical
assemblies, direct access
storage devices, optical
components, polymeric
containers, porous metals,
ceramics
Low viscosity and high
diffusivity permit cleaning in
very small cracks and pore
spaces
Compatible with metals,
ceramics, and polymers such as
Teflon™, high-density
polyethylene, epoxies, and
polyimides
No solvent residue left on part
May be very useful for cleaning
oxygen equipment
Solvent properties can be altered
by adding a cosolvent
Cosolvents used to improve the
solvent power of CO2 may have a
pollution potential
Danger of a pressure vessel
explosion or line rupture
Causes swelling in aery late, styrene
polymers, neoprene, polycarbonate,
and urethanes
Components sensitive to high
pressures and moderate temperatures
should not be cleaned by SCF
methods
Ineffective in removing inorganic
and polar organic contaminants; for
example, does not remove
fingerprints
Carbon Dioxide
Snow
• No polluting emissions
released
• Replaces CFCs and
solvents
• Does not generate
wastewater
• Uses natural or
industrial sources of
CO2, so no net
production of CO2
occurs
• Carries contaminants
away in a stream of
inert CO,
Cleans critical surfaces on
delicate fiber optic
equipment
Cleans radioactive-
contaminated components
Used in hybrid circuits to
remove submicron particles
Used on the largest, most
expensive telescopes
Removes submicron
particles and light oils from
precision assemblies
Removes light fingerprints
from silicon wafers and
mirrors
Prepares surface for surface
analysis
Generates no media waste, thus
no media disposal cost
Does not create thermal shock
Is nonflammable and nontoxic
Noncorrosive
Leaves no detectable residue
Can penetrate narrow spaces and
nontrubulent areas to dislodge
contaminants
Adjustable flake size and intensity
More effective than nitrogen or
air blasting
Can clean hybrid circuits without
disturbing the bonding wire
CO2 must be purified
Requires avoidance of long dwell
times
Particulates such as sand may be
carried by the gas stream and scratch
the surface
Heavier oils may require the
addition of chemicals and heat to be
completely removed
116
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Limitations of Aqueous Cleaners
• Some aqueous cleaners contain organic substances that may be hazardous.
• Aqueous cleaners are generally not as fast or effective as traditional halogenated solvents.
• Material Safety Data Sheets (MSDSs) for individual products should be consulted before use.
• Metal corrosion may occur if parts cannot be dried quickly enough.
• Stress corrosion cracking can occur in some polymers as a result of contact with alkaline solutions.
• Compatibility of the product/process with water must be carefully investigated.
Semi-Aqueous Cleaners
Semi-aqueous cleaners comprise a group of cleaning solutions that are composed of natural or
synthetic organic solvents, surfactants, corrosion inhibitors, and other additives. The term semi-aqueous
refers to the use of water in some part of the cleaning process, such as washing, rinsing, or both. Semi-
aqueous cleaners are designed to be used in process equipment much like that used with aqueous cleaners.
The commonly used semi-aqueous cleaners include water-immiscible types (terpenes, high-molecular-weight
esters, petroleum hydrocarbons, and glycol ethers) and water-miscible types (low-molecular-weight alcohols,
ketones, esters, and organic amines).
Semi-aqueous cleaners are designed to be water-rinsable or non-water-rinsable. After washing in a
water-rinsable type, cleaned parts may be rinsed in water to remove residue. If a non-water-rinsable type is
used, cleaned parts may be rinsed in alcohol, such as isopropyl alcohol, or other organic solvent, or the
residue may be allowed to remain on the parts. If rinsing is the desired option, it is common practice to rinse
in secondary tank to capture dragout cleaner.
If the semi-aqueous cleaner is diluted with water to form an emulsion, the cleaner can be coalesced
into its aqueous and nonaqueous components by gravity separation or by advanced membrane separation
techniques. These techniques permit used cleaner to be recycled back into the wash tank or discharged for
treatment and disposal. Vacuum distillation can be used to purify single-component solvents. Reclaimed
rinsewater also can be reused or discharged.
Proper use of these cleaners is required to reap their full pollution prevention benefits. Good
engineering design is essential so that air emissions can be kept low. For example:
• The cleaning bath should be operated at the minimum temperature where acceptable cleaning
performance is obtained.
• Low-vapor-pressure cleaning agents should be used.
• Dragout should be minimized by the use of air knives.
• The air exhaust rate should be maintained at a minimum level.
Terpene semi-aqueous cleaners are normally used at ambient temperature or heated to no higher than
90°F. However, many high-molecular-weight esters have flash points in excess of 200°F. Also, the glycol
ethers generally have flash points above 200°F and can be heated for improved solvency.
N-methyl-2-prrylidone (NMP) has been used for removing cured paint and hence is a substitute for
methylene chloride. NMP is better suited for immersion tanks than other application methods, because
elevated temperatures are required to enhance its chemical activity. Usually, NMP immersion cleaning or
paint removing is done at 155°F in an open tank, or up to 180°F if a mineral oil seal is present.
In general, the semi-aqueous cleaners have excellent solvency for a number of difficult
contaminants, such as heavy grease, tar, and waxes. The cleaners have low surface tension, which decreases
their contact angles and allows them to penetrate small spaces such as crevices, blind holes, and below-
surface-mounted electronic components. Rinsing is necessary to avoid leaving a residue on the cleaned parts.
If water rinsing is performed, the parts must be dried.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 117
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Benefits of Semi-Aqueous Cleaners
The primary pollution prevention benefit of semi -aqueous cleaners is that they are non -ozone
depleting. However, they may be partly or completely composed of VOCs. In addition, their use commands
substantially more concern about aquatic toxicity and human exposure than does the use of aqueous cleaners.
Most semi -aqueous cleaners are reported to be biodegradable. One benefit of semi -aqueous cleaners is that
distillation and membrane filtration technologies are being developed that will permit recycling and reuse of
the products.
The following benefits have been identified with semi -aqueous cleaners.
• May be more aggressive in removing heavy organic contaminants.
• May have lower corrosion potential with water-sensitive metals.
• Penetrate small spaces more easily because they have lower surface tensions.
• Semi-aqueous cleaners are noncorrosive to most metals and generally are safe to use with most
plastics.
Limitations of Semi-Aqueous Cleaners
• Mists of concentrated semi -aqueous cleaners can be ignited at room temperature.
• Terpenes have flash points as low as 115°F, therefore, the low flash point restricts safe operating
temperatures to no more than 90°F in some cases.
• Strong odors may become objectionable to workers, thus requiring additional ventilation in areas
where they are used.
• Reproductive health problems associated with glycol ethers are a cause for serious concern.
• Although semi -aqueous cleaners are biodegradable, the capacity of treatment facilities to treat the
wastewater properly should be explored.
• Terpenes generally are not recommended for cleaning polystyrene, PVC, polycarbonate, low-density
polyethylene, and polymethylpentene; nor are they compatible with the elastomers natural rubber,
silicone, and neoprene. Likewise, NMP dissolves or degrades ABS, Kynar™, Lexan™, and PVC
and it causes swelling in Buna-N, Neoprene, and Viton™.
Petroleum Hydrocarbons
Hydrocarbon solvents dissolve organic soils. Some solvents that have flash points as low as 105°F
must be used at ambient temperature to avoid a fire hazard. Many high-grade hydrocarbon solvents have
flash points above 140°F. Higher flash points are achieved using higher-molecular-weight compounds.
Some formulations contain non-petroleum additives such as high-molecular-weight esters to improve
solvency and raise the flash point.
When the cleaning lifetime of a hydrocarbon solvent expires, the entire bath must be replaced. Used
hydrocarbon solvents commonly are blended with other fuels and burned for energy recovery.
Petroleum hydrocarbons are available in two grades, the basic petroleum distillates and the specialty
grade of synthetic paraffinic hydrocarbons. Products of the petroleum distillate grade include mineral spirits,
kerosene, white spirits, naphtha, Stoddard Solvent, and PD-680 (military designation; types I, II, and III).
These are technologically less advanced, as they contain components that have a broad range of boiling points
and may include trace amounts of benzene derivatives and other aromatics.
Petroleum hydrocarbons typically are used when water contact with the parts is undesirable.
Cleaning with petroleum distillates lends itself to simple, inexpensive one-step cleaning in situations where a
high level of cleanliness is not essential.
Benefits of Petroleum Hydrocarbons
The primary pollution prevention benefits of petroleum hydrocarbon solvents are that they produce
no wastewater and they are recyclable by distillation. Paraffinic grades have very low odor and aromatic
118 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Industrial Operations: Cleaning & Degreasing
content and low evaporative loss rates. However, planned recovery of VOCs is an important part of pollution
prevention if these solvents are to be used.
The following benefits of petroleum hydrocarbon solvents have been identified.
• No water is used with petroleum hydrocarbon cleaners, so there is no potential for water corrosion or
for water to become trapped in cavities.
• Hydrocarbon solvents can easily be recycled on- or off-site.
Limitations of Petroleum Hydrocarbons
• Petroleum hydrocarbons are flammable or combustible, and some have very low flash points, as low
as 105°F.
• Process equipment, including drying ovens, must be designed to mitigate explosion dangers.
• The toxicity level of hydrocarbon solvents is considered low: 8-hour PELs for Stoddard Solvent and
VM & P naphthas are 100 ppm and 400 ppm, respectively.
• Residues may remain on the parts long after they are cleaned.
• Hydrocarbons are VOCs, and hence they are photochemical smog producers.
• Businesses choosing this alternative must consider the expenses of possible requirements for
recovering VOCs from exhaust equipment.
Hvdrochlorofluorocarbons (HCFCs)
HCFCs are designed to be near term replacements to CFC-113 for vapor degreasing. However, the
properties of the HCFCs differ somewhat from those of CFC-113, so that vapor degreasing equipment that
was designed for CFC-113 would have to be retrofitted to accommodate HCFCs.
It is important to realize that HCFCs are being developed for interim use only. The London
Amendments to the Montreal Protocol call for a ban of HCFCs between 2020 and 2040. The main reason for
choosing this technology is to enable an existing CFC-113 vapor degreasing system to continue in use until a
long-term alternative is found. The long-term alternative could be a completely enclosed vapor degreaser or a
non-HCFC technology discussed in this section.
Hydrochlorofluorocarbons, or HCFCs, were developed to lower emissions of ozone-depleting
substances that are used in cleaning, foam-blowing agents, and refrigerants. Although HCFCs accomplish the
goal of reducing emissions, they have some ozone depleting potential; about 0.15 for HCFC-141b and 0.033
for HCFC-225cb-relative to CFC-113, which is 1.0. Therefore, HCFC-141b depletes ozone at a rate about 6
to 7 times less than that of CFC-113, but about equal to that of TCA. The ozone depletion rate for HCFC-
225cb is about 30 times lower than that of CFC-113.
Benefits ofHCFC's
• HCFCs provide a short-term solution to choosing an alternative solvent and allow use of existing
equipment.
Limitations ofHCFC's
• Because HCFCs have lower boiling points than CFC-113, HCFC solvent vapors may be lost too
quickly in older degreasers, and these vapors may be a health risk.
• Some emission control features may have to be added, such as extending freeboard height, adding
secondary condensers, or completely enclosing the system.
• HCFC cleaners are incompatible with acrylic, styrene, and ABS plastic.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 119
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Notes Miscellaneous Organic Solvents
This group covers a wide range of solvents that may be beneficial as a replacement technology,
particularly on a small scale, such as bench-top or spot cleaning. Types of miscellaneous organic solvents
that are commonly used include alcohols, liner methyl siloxanes, vegetable oils, ketones, esters, and ethers.
Alcohols are polar solvents and have good solubility for a wide range of inorganic and organic soils.
The lighter alcohols are soluble in water and may be useful in drying operations.
Ketones have good solvent properties for many polymers and adhesives. Lighter ketones, such as
acetone, are soluble in water and may be useful for certain rapid drying operations. Heavier ketones, such as
acetophenone, are nearly insoluble in water. Ketones generally evaporate completely without leaving a
residue. Some ketones such as methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK) once were
widely used, however, they now are considered Hazardous Air Pollutants (HAPs) and thus are not favorable
solvent substitutes.
Esters and ethers also have good solvent properties. Low-molecular-weight compounds dry readily
without leaving a residue.
A new class of organic solvents is the volatile methyl siloxanes. Their molecular structure is either
linear or cyclic. The linear methyl siloxanes are nonpolar and are most effective in removing nonpolar and
nonionic contaminants. The most volatile methyl siloxane can function as a drying agent.
Vegetable oils are finding use in removing printing inks. They are also compatible with elastomers.
Vegetable oils contain triglycerides of fatty acids, typically oleic, linoleic, palmitic, and stearic fatty acids.
Benefits of Miscellaneous Organic Solvents
The miscellaneous organic solvents do not contain halogens; therefore, they do not contribute to
ozone depletion. However, all of these compounds are VOCs and evaporate readily, thereby contributing to
smog formation. The solvents discussed in this section normally are used in small quantities for niche
applications.
Most of these solvents are well developed and some have been used as cleaners for a century or
more. Many of them have reached their full potential for development. The lighter alcohols and ketones
have high evaporation rates and, therefore, fast drying times. The more volatile solvents are best suited for
spot cleaning, where rapid evaporation is desired. Users should consult MSDS literature for safe handling
practices.
The benefits of each type of miscellaneous solvent are discussed below.
• Ethyl and isopropyl alcohols are commonly used in spot cleaning and touch-up applications.
Because they are slightly polar, they tend to be good, general-purpose solvents for nonpolar
hydrocarbons, polar organic compounds, and even ionic compounds. Ethyl and isopropyl alcohols
are fully miscible in water.
• Benzyl alcohol is a solvent for gelatin, casein (where heated), cellulose acetate, and shellac, and is
used as a general paint softener (when heated). The good solvent properties of benzyl alcohol can be
enhanced by heating; its flash point is 101°C, or 213°F (closed cup). Mixtures composed of 90%
benzyl alcohol and 10% benzoic acid are also used for solvent cleaning applications. Pure benzyl
alcohol is 4% soluble in water, but is miscible in lighter alcohols and with ether.
• Furfuryl alcohol forms a miscible, but unstable solution in water. It is used as a general cleaning
solvent and paint softener. Furfuryl alcohol is soluble in water and is miscible in lighter alcohols
and in ether. The solvent properties of furfuryl alcohol can be enhanced by moderate heating; its
flash point is 75°C, or 167°F (closed cup).
• N-butyl alcohol is a solvent for fats, waxes, resins, shellac, varnish, and gums. It is 9% soluble in
water at 25°C, but forms an azeotrope with water (63% n-butyl alcohol/37% water) that boils at
92°C. N-butyl alcohol is miscible in lighter alcohols, ether, and many other organic substances.
• N-butyl acetate is a solvent used in lacquer production. It is less than 1% soluble in water at 25°C.
The solvent activity of n-butyl acetate is enhanced by mixing with n-butyl alcohol. A mixture of
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80% n-butyl acetate and 20% n-butyl alcohol is used to dissolve oil, fats, waxes, metallic resinates,
and many synthetic resins such as vinyl, polystyrene, and acrylates. Also, the mixture dissolves less
highly polymerized alkyd resins and shellac.
• Ethyl lactate is another ester that has useful solvent properties. The use of ethyl lactate is relatively
new to cleaning and degreasing. Recently, it has been shown to have good solubility for skin oils,
cutting fluids, coolants, mold release compounds, and marking inks. Ethyl lactate has a flash point
of 47°C, or 117°F (closed cup).
• Acetone is a solvent for fats, oils, waxes, resins, rubber, some plastics, lacquers, varnishes, and
rubber cements. It is completely miscible in water and in most organic solvents.
• Volatile methyl siloxanes have been found to remove contaminants in precision metalworking,
optics, and electronics processing. They remove cutting fluids, greases, and silicone fluids. They
have low odor and evaporate in the range of butyl acetate, without leaving a residue. They can be
used in cleaning equipment designed for use with isopropyl alcohol.
Limitations of Miscellaneous Organic Solvents
Limitations of some of these cleaners is that some have vapor pressures that are too high to be used
in standard process equipment, whereas others evaporate too slowly to be used without including a rinse
and/or dry process. The following specific limitations have been noted with these solvents.
• Low flash points that present a fire hazard.
• Inhalation of these solvents can present a health hazard.
• The more volatile solvents will not be able to meet VOC emission restrictions in highly regulated
areas of the country.
Supercritical Fluids
Supercritical fluids (SCF) cleaning exploits the marked improvements of the solvent power of CO2
or other substances after they undergo a phase transition from a gas or liquid phase to become supercritical
fluids. Supercritical CC>2 has been used very successfully to remove organic soils of moderate molecular
weight and low polarity. Supercritical CC>2 does not give good results for soils that are ionic or polar in
nature, such as fingerprints.
SCF cleaning is probably best reserved for removing small amounts of soil from parts that require a
high degree of cleanliness. For example, precision cleaning operations have been performed successfully on
the following devices: gyroscope parts, accelerometers, thermal switches, nuclear valve seals,
electromechanical assemblies, polymeric containers, optical components, porous metals, and ceramics.
The main advantage of using carbon dioxide (CC>2) as a supercritical fluid (SCF) is that CC>2 is
derived from the atmosphere and is not created for use as a solvent. Furthermore, the small quantity of CO2
released would have an insignificant effect on global warming. On the other hand, cosolvents, which may be
used to improve the solvent power of CO2, may have pollution potential and should be investigated before
use. Energy is required to operate the pumps and temperature control equipment that are needed in
supercritical cleaning equipment.
Benefits of Supercritical Fluids
• No solvent waste stream.
• Low viscosity and high diffusivity permit SCFs to clean within very small cracks and pore spaces.
• The solvent power of SCFs is pressure-dependent, making it possible to extract different soils
selectively and precipitate them into collection vessels for analysis.
• SCFs are compatible with metals, ceramics, and polymers such as Teflon™, high-density
polyethylene, epoxies, and polyimides.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 121
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Limitations of Supercritical Fluids
• The only major safety concern is the danger of a pressure vessel or line rupture.
• SCFs cause swelling in acrylates, styrene polymers, neoprene, polycarbonate, and urethanes.
• Components that are sensitive to high pressures and temperatures should not be cleaned by SCF
methods.
• SCFs are not effective in removing inorganic and polar organic soils, nor do they remove loose scale
or other particulates.
Carbon Dioxide Snow
CC>2 snow gently removes particles smaller than 10 microns in diameter down to 0.1 micron that are
difficult to remove using high-velocity liquid nitrogen. It is used to remove light oils and fingerprints from
mirrors, lenses, and other delicate surfaces, and from precision assemblies, without scratching the surface.
Cleaning action is performed when the snow particles impact a contaminated surface, dislodge
adherent contaminant particles, and carry them away in the gas stream. The process is effective in removing
very small (submicron) particles, where fluid drag normally restricts the performance of liquid phase
cleaning. The CC>2 snow cleaning process is also believed to attack hydrocarbon film by dissolving
hydrocarbon molecules in a temporal liquid CC>2 phase at the film-substrate interface. The dissolved film is
then carried away by subsequent flow of snow and gas.
CO2 snow can clean hybrid circuitry and integrated circuits without disturbing the bonding wires.
This unique ability cannot be duplicated by any other cleaning mechanism. In the disc drive industry, CO2
snow is used to remove particles from discs without damage to the operation.
The process is used to remove paste fluxes in soldering. If the grease cannot be removed with CC>2
snow alone, combination of CC>2 snow and ethyl alcohol is effective, followed by CC>2 snow alone to remove
the impurities from the alcohol.
CC>2 is used to remove hydrocarbons and silicone grease stains from silicon wafers. Wafers
artificially contaminated with a finger print, a nose print, and a thin silicone grease film were found to have
surface hydrocarbon levels 25 to 30% lower after CC>2 snow cleaning than the original wafer surfaces.
CC>2 snow is also used to clean surfaces exposed to contaminants in air prior to surface analysis. The
process was found to work better than solvents to clean vacuum components. Because the aerosol could
penetrate narrow spaces, no disassembly was required, greatly shortening the time required for cleaning.
Furthermore, CO2 cleaning is effective on some plastic parts that cannot be cleaned by solvents.
Chilled CO2 is a nontoxic, inert gas that replaces solvent use to eliminate ozone-depleting
substances. Because the CO2 is recycled, there is no need for disposal, nor is any wastewater produced. It
generates no hazardous emissions.
Benefits of Carbon Dioxide Snow
• CC>2 snow performs ultrapure cleaning of light oils down to submicron size on the most delicate,
sensitive materials ranging from bonding wires to precision mirrors in telescopes.
• The CC>2 snow crystals generated by the snow gun are extremely gentle.
• The CC>2 snowflakes are adjustable to a wide range of size and intensity.
• The process does not create thermal shock, is nonflammable and nontoxic, and causes no apparent
chemical reactions.
• Cleaning by CC>2 snow is noncorrosive and leaves no residue.
• CC>2 snow does not crack glass or other ceramics.
• No media separation system is needed, nor is there a media disposal cost.
• CO2 snow can penetrate the nonturbulent areas to dislodge contaminants and can be used on
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components without disassembly that otherwise must be disassembled because the aerosol penetrates
narrow spaces.
Limitations of Carbon Dioxide Snow
• Heavier oils, alone or mixed with light oils, may require chemical precleaning and/or heating to be
completely removed.
• The CO2 must be purified because of its tendency to dissolve contaminants from the walls of tanks
in which it is stored. Purification equipment adds expense to the CC>2 snow cleaning process.
• When surfaces are excessively chilled by long dwell times, airborne impurities may condense and
settle on the clean surface.
• CC>2 snow has low Mohs hardness and will not scratch most metals and glasses. However, hard
particulates such as sand that may be present on a surface potentially could cause scratching when
carried by the gas stream.
Process Changes
Process changes can either eliminate the need for cleaning or apply techniques that eliminate or
reduce the use of solvents.
Another possibility is to combine an alternative cleaning solution with a process change. Sometimes
the cleaning effectiveness of a solvent substitute is not adequate, and a process change can improve the
effectiveness of the substitute. In such a case, a process change is combined with solvent substitution to create
a cleaner technology. In other cases, the process change may involve reducing the amount of solvent or
making it amenable to recycling.
The following five common process changes for cleaning and degreasing are presented below:
• Add-on controls to existing vapor degreasers,
• Completely enclosed vapor cleaner,
• Automated aqueous cleaning,
• Aqueous power washing, and
• Ultrasonic cleaning.
Exhibit 5.2 summarizes the Pollution Prevention Benefits, Reported Application, Operational
Benefits, and Limitations of each to provide a range of technologies to allow preliminary identification of
those that may be applicable to specific situations.
Add-on Controls to Existing Vapor Degreasers
Add-on controls are features that can be incorporated into an existing degreaser to reduce air
emissions. These process changes include the following:
• Operating controls,
• Covers,
• Increased freeboard height,
• Refrigerated freeboard coils, and
• Reduced room draft/lip exhaust velocities.
Operating Controls
The add-on controls limit air emissions through changes in operating practices or through equipment
modifications. Operating controls are practices that reduce work load-related losses. These can be easily
incorporated into the operating procedure, but their impact on emission reduction is significant. Air
emissions can be reduced by slowing down the rate of entry of the work load into the (open-top vapor
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Exhibit 5.2: Available Technologies for Cleaning and Degreasing
Cleaning/Degreasing
Technology
Add-on Controls to Existing
Vapor Degreasers
Completely Enclosed Vapor
Cleaner
Automated Aqueous
Cleaning
Aqueous Power Washing
Pollution Prevention
Benefits
• Reduce solvent air
emissions
• Virtually eliminates
solvent air emissions
• Eliminates solvent use by
using water-based
cleaners
• Eliminates solvent use by
using water-based
cleaners
Reported Application
• Retrofitted on existing
vapor degreasers
• Same as conventional
open-top vapor
degreasers
• Cleaning of small parts
• Cleaning of large and
small parts
Operational Benefits
• Allow gradual phase-in of emission
controls
• Major process modifications not
required
• Cleaning principle remains the
same
• Relatively inexpensive
• Virtually eliminates air emissions
and workplace hazards
• Cleaning principle remains the
same; user does not have to switch
to aqueous cleaning
• Significant recovery of solvent
• Reduced operating costs
• Eliminates solvent hazards
• Reduces water consumption
• Cleaning chemicals are reused
• Easy to install and operate
• Eliminates solvent hazards
• Reduces cleaning time
Limitations
• Reduce but cannot eliminate air
emissions
• Performance depends on other
features of existing degreaser
• Dragout on parts cannot be
eliminated
• High initial capital cost
• Slower processing time
• Relatively high energy
requirement
• May not be able to replace vapor
degreasing for some delicate
parts, and requires more space
than vapor degreasing
• Wastewater treatment required
• Relatively higher energy
requirement
• Pressure and temperature may be
too great for some parts
• Wastewater treatment required
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Exhibit 5.2: Available Technologies for Cleaning and Degreasing (cont.)
Cleaning/Degreasing
Technology
Ultrasonic Cleaning
Low-Solids Fluxes
Inert Atmosphere Soldering
Pollution Prevention
Benefits
• Eliminates solvent use by
making aqueous cleaners
more effective
• Eliminates need for
cleaning and therefore
eliminates solvent use
• Eliminates need for flux
and therefore eliminates
solvent cleaning
Reported Application
• Cleaning of ceramic,
aluminum, plastic and
metal parts, electronics,
glassware, wire, cable,
rods
• Soldering in the
electronics industry
• Soldering in the
electronics industry
Operational Benefits
• Eliminates solvent hazards
• Can clean in small crevices
• Cost effective
• Faster than conventional methods
• Inorganics are removed
• Neutral or biodegradable
detergents can often be employed
• Eliminates solvent hazards
• Little or no residue remains after
soldering
• Closed system prevents alcohol
evaporation and water absorption
• Eliminates solvent hazards
• Economic and pollution preventio n
benefits from elimination of flux
Limitations
• Part must be immersible
• Testing must be done to obtain
optimum solution and cavitation
levels for each operation
• Thick oils and grease may
absorb ultrasonic energy
• Energy required usually limits
parts sizes
• Wastewater treatment required if
aqueous cleaners are used
• Conventional fluxes are more
tolerant of minor variations in
process parameters
• Possible startup or conversion
difficulties
• Even minimal residues are
unacceptable in many military
specifications
• Requires greater control of
operating parameters
• Temperature profile for reflow
expected to play more important
role in final results
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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JT , cleaner) OTVC tank. The faster the work load is lowered into the tank, the greater the disturbance or
turbulence created at the vapor-air interface and the greater are the air emissions as the interface tries to
reestablish itself. When the workload is lowered manually into the tank it is difficult to achieve a slow,
steady rate of entry. Installing an electric hoist above the OTVC allows greater control on the rate of entry or
removal of the workload. Reducing the area of the horizontal face of the basket in proportion to the area of
the OTVC tank opening is another way of reducing turbulence at the interface; this will however, adversely
affect the production rate.
Facilitating parts drainage also is an important operating control. Parts that have recesses in which
solvent condensate could accumulate must be placed in the basket in such a way that the condensate drains
out of and not into the recesses. Thus, the amount of condensate dragged out as the basket is removed from
the OTVC tank is limited, reducing subsequent air emissions. Another way of reducing dragout is to install
electric-powered rotating baskets. The rotation allows condensate to drain out of the recesses in the parts.
Covers
A simple flat or rolling cover can be installed on the top of the OTVC tank to reduce air emissions.
A cover reduces drafts in the freeboard that may cause disturbances. A cover also reduces diffusion losses
during startup/shutdown, downtime, or idling. Covers should slide gently over the top of the opening to
reduce disturbances. Automatic bi-parting covers that enclose the tank while the workload is in the process of
being cleaned are also available. Covers can reduce working air emissions from an OTVC by as much as 35
to 50%. The variations in the percent reduction reflect different initial design and operating conditions of the
OTVCs tested.
Increased Freeboard Height
Increasing the freeboard height from 0.75 to 1.0 or 1.25 can reduce air emissions significantly.
Increasing the freeboard height that is, the height of the tank above the vapor-air interface reduces the
susceptibility of the interface to room drafts and also increases the distance over which diffusion has to occur.
Raising the freeboard on an existing OTVC may, however, reduce a worker's accessibility to the tank, but a
raised platform next to the OTVC or an electric hoist can alleviate the problem. Raising the freeboard height
from 0.75 tol.O reduces working air emissions by up to 20% and under idling conditions by up to 40%.
Increasing the freeboard height from 1.0 to 1.25 reduces emissions by another 5 to 10
Refrigerated Freeboard Coils
Air emissions can be reduced through diffusion by installing refrigerated coils on the freeboard
above the primary condenser coils. The refrigerated coils may be designed to operate either above or below
freezing temperatures. Although theoretically the below freezing coils should work best, in practice, the
below- freezing coils have to be operated on a timed defrost cycle to prevent ice from building up on the
coils. This periodic defrosting cycle reduces the efficiency of the coils to some extent. Working emissions
are reduced by approximately 20 to 50% for above-freezing coils and by approximately 30 to 80% for below-
freezing coils. Under idling conditions, emissions with below-freezing coils were reduced by approximately
10 to 60%. Some systems operate with the primary condenser coils refrigerated, instead of having separate
refrigerated coils.
Reduced Room Draft/Lip Exhaust Velocities
Room drafts caused by plant ventilation can cause an increase in air emissions by sweeping away
solvent vapors that diffuse into the freeboard region, leaving behind a turbulence that promotes greater
emissions. Reducing room drafts can reduce these emissions. One interesting case is when lip exhausts
themselves cause emissions. Lip exhausts are kteral exhausts installed on the perimeter of the OTVC
opening to reduce solvent concentrations in the region where workers are exposed. However, this very
feature increases diffusion and solvent diffusion losses from the OTVC sometimes are almost doubled.
Although most of the diffusing solvent is captured by the lip exhaust and may be recovered later by carbon
absorption, some vapor escapes to the ambient.
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Benefits of Add-On Controls to Existing Vapor Degreasers
Additional controls can be incorporated into an existing OTVC to reduce these air emissions. These
add-on controls are an important way of reducing solvent emissions without changing the cleaning operation
dramatically. Add-on controls have the following benefits.
• They can be retrofitted onto existing vapor degreasers.
• Simple add-ons such as a cover can reduce air emissions significantly.
• Reduced air emissions mean reduced solvent consumption and hence reduced operating costs.
• Add-on controls are relatively inexpensive.
• They are easy to install and operate.
• Using add-on controls requires no additional labor or skills.
Limitations of Add-On Controls to Existing Vapor Degreasers
• The performance of any one add-on control is dependent on the design features already available on
the OTVC. For example, the control efficiency of refrigerated coils varies depending on the
temperature and efficiency of the existing primary condenser.
• Air emissions can be reduced considerably but not eliminated by suing multiple controls. For
example, if adding a cover along reduces air emissions by 50% and adding refrigerated coils alone
reduces air emissions by 50%, adding both the cover and the refrigerated coils will not give 100%
reduction.
• Work load-related losses can be reduced but not eliminated.
• Dragout of solvent with the workload cannot be eliminated using add-on controls. Some residual
solvent will escape from the parts to the ambient air.
Completely Enclosed Vapor Cleaner
In a completely enclosed vapor cleaner (CEVC), the workload is placed in an airtight chamber, into
which solvent vapors are introduced. After cleaning is complete, the solvent vapors in the chamber are
evacuated and captured by chilling and carbon absorption. Once the solvent in the chamber is evacuated, the
door of the chamber is opened and the workload is withdrawn. The cleaned workload is also free from any
residual solvent and there are no subsequent emissions.
The CEVC remains enclosed during the entire cleaning cycle. Approximately 1 hour before the shift
starts, a timer on the CEVC unit switches on the heat to the sump. When the solvent in the sump reaches
vapor temperature, the vapor is still confined to an enclosed j acket around the working chamber. The parts to
be cleaned (work load) are placed in a galvanized basket and lowered by hoist form an opening in the top into
the working chamber. The lid is shut, the unit is switched on, and compressed air (75 psi) from an external
source hermetically seals the lid shut throughout the entire cleaning cycle.
Exhibit 5.3 shows the cleaning cycle stages. First, solvent vapors enter the enclosed cleaning
chamber and condense on the parts. The condensate and the removed oil and grease are collected through an
opening in the chamber floor. When the parts reach the temperature of the vapor, no more condensation is
possible. At this point, fresh vapor entry is stopped and the air in the chamber is circulated over a cooling coil
to condense out the solvent. Next, the carbon is heated up to a temperature where most of the solvent
captured in the previous cleaning cycle can be desorbed. The desorbed solvent is condensed out with a
chiller. The carbon absorbs the residual solvent vapors from the air in the cleaning chamber. The absorption
stage continues until the concentration in the chamber is detected by a sensor that falls below a preset level
(usually around 1 g/m ). When the concentration goes below this level, the seal on the lid is released and the
lid can be retracted to remove the workload. Upon retraction, a tiny amount of residual solvent vapor escapes
to the atmosphere, the only emission in the entire cycle. Tests have shown that the CEVC reduces solvent
emission by more than 99% compared with an OTVC.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 127
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Notes
Exhibit 5.3: CEVC Cleaning Cycle
Stage
Solvent Heat -up (once a day)
Solvent Spray (optional)
Vapor Fill
Degreasing
Condensation
Air Recirculation
Carbon Heat-up
Desorption
Adsorption
Vendor Recommended Time Setting
Variable to Raise Temperature to 70 °C
10 -180 sec.
8 - 40min. (Varies according to mass of work load and
type of metal.)
20 -180 sec.
120 sec.
120 sec.
Variable
60 sec.
60 -240 sec.
Unlike a conventional degreaser, there are no significant idling losses between loads, downtime, or
during shutdown. The CEVC can be operated as a distillation unit to clean the liquid solvent in the sump. To
distill, the unit is switched on without any workload in the chamber. After most of the solvent is converted to
vapor, the residue in the sump is drained out and the vapors in the chamber are condensed in the chiller to
recover the solvent. CEVC thus provides a good alternative for meeting pollution prevention objectives.
Energy requirements of the CEVC are higher compared with a conventional degreaser. The CEVC
operates on a 480-V AC electric supply and consumes approximately 22 kW of power. The higher energy is
required to generate, condense, and move the vapor during each load.
One significant difference between a conventional degreaser and the CEVC is that, in the
conventional degreaser, there is always a solvent vapor layer present in the degreasing tank. This layer is
continuously replenished with solvent vaporizing from the sump. The workload therefore reaches vapor
temperature very soon and the cleaning is completed. The CEVC, on the other hand, goes through several
stages to evacuate and introduce vapors. Although most of the stages have a relatively fixed time requirement,
the vapor-fill stage time varies. The vapor is introduced near the bottom of the working chamber with each
workload. The vapor slowly works itself up through the workload bringing each successive layer of parts in
the basket to vapor temperature. The time taken for the entire load to reach vapor temperature varies from 8
to 40 minutes. This vapor-fill time, however, is highly dependent of the total mass and type of metal in the
workload. The factor that governs the variation based on type of metal is the thermal diffusivity of each
metal. The thermal diffusivity itself is a function of the thermal conductivity, specific heat, and density of the
metal.
For a CEVC unit, as the mass of the workload increases, the total cycle time increases (mainly due to
an increase in the vapor-fill stage time). Parts made out of copper or aluminum require a lower cycle time
compared to steel. Aluminum, though, has a much lower density, and there is a limit as to the mass (or
weight) of parts that can fit into the basket for one cycle. Additional parts have to be run through the next
batch or cleaning cycle.
Benefits of Completely Enclosed Vapor Cleaning
• Reduces solvent emissions by over 99% compared to a conventional OTVC.
• Users who do not want to switch to aqueous cleaning can still achieve significant pollution
prevention by using the CEVC.
• Labor and skill level requirements are similar to those for a conventional OTVC.
• The CEVC lowers operating costs by reducing solvent losses.
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• No additional facility modifications are needed to meet OSHA requirements for plant ambient
solvent levels.
• The CEVC has fully automated cycles and runs unattended except for loading and unloading. The
unit adjusts automatically to any type of workload and unseals the working chamber when the cycle
is complete.
Limitations of Completely Enclosed Vapor Cleaning
• The CEVC has relatively high capital cost compared to a conventional OTVC.
• The CEVC has longer cleaning cycles for the same capacity.
• It has a relatively higher energy requirement because of the alternating heating and cooling stages.
Automated Aqueous Cleaning
Small machine parts are often cleaned in batches of thousands by immersion into a solvent solution
or a solvent vapor. An alternative to this process is the automated aqueous parts washer. Instead of
immersion, the automated aqueous washer sprays an aqueous solution across the parts to remove oil and
debris. Parts travel through a series of chambers, each with different concentrations of cleaning and rinsing
solutions. Excessively sprayed solution is recovered and reused. Similar automated cleaners are also
available for semi-aqueous cleaning solutions.
The configuration of the system promotes good contact between cleaning solutions and the parts.
One example of an automated aqueous cleaner consists of a series of five compartments though which the
soiled metal parts are transported. The parts are transported form one compartment to the next by a helical
screw conveyor. The parts are sprayed successively with solutions from five holding tanks (one for each
compartment). The first compartment sprays hot water on the parts. The second and third compartments
spray detergent solutions at two different concentrations on the parts. The fourth compartment is for a clean
water rinse. The fifth and final compartment sprays a rust inhibitor solution, if required. The fifth
compartment is followed by a dryer that vaporizes any water droplets remaining on the parts. The cleaned
parts drop out of the dryer onto a vibrating conveyor from which they are collected.
The automated aqueous washer also makes use of a "closed loop" system, whereby the used
solutions are not disposed of daily but can be recirculated for a relatively continuous operation. The cleaning
solutions are recaptured after use and sent to a separator tank. One separator tank is provided for each
compartment. In these tanks, the oil floats to the surface and is skimmed off by a pump. Dirt and suspended
particles settle down at the bottom of the tank. The bulk of the solution is recirculated back to the holding
tanks for reuse. Some makeup solution is needed periodically to replace losses from evaporation and dragout.
Detergent chemicals are also replenished periodically.
Because the closed-loop system eliminates daily disposal of spent solutions, the same cleaning
solution can be recirculated and used for several days without changing. At the end of the week (or whenever
the contaminants reach a certain level), the holding tanks are emptied and fresh solutions are made up.
Because recovery and reuse of the cleaning solution is automatic, the unit requires very little operator
attention. In contrast to vapor degreasing or traditional batch aqueous cleaning processes, the continuous
operation of this conveyorized unit enables production efficiency. The only operator involvement is for
unloading a barrel of soiled parts into the hopper that feeds the parts to the compartments.
Several variations of the automated aqueous cleaners are available. Different types of filters, oil-
water separators, and sludge thickeners are some of the features offered. Some new units claim zero
wastewater discharge, with fresh water added only to make up for evaporation in the drier.
Benefits of Automated Aqueous Cleaning
Automated aqueous cleaners use aqueous cleaning solution instead of solvents to achieve high-
quality cleaning. This available technology replaces the hazardous solvent waste stream with a much less
hazardous wastewater stream. These automated machines also have features to significantly reduce the
amount of wastewater generated. These machines remove some of the contamination from the parts being
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 129
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JT , cleaned into the cleaning solution. The cleaning solution can then be recirculated for use several times. The
automated washer described above has the following benefits.
• Improved contact between cleaning solution and parts being cleaned enables most types of parts to
be aqueous cleaned instead of solvent cleaned.
• Solvent usage at a metal finishing plant can be drastically reduced or eliminated.
• Cleaning effectiveness is comparable to vapor degreasing or conventional aqueous cleaning
processes (alkaline tumbling or hand-aqueous washing).
• The amount of wastewater generated is very low compared to the amount generated by traditional
aqueous processes. In some types of units, the manufacturer claims that wastewater is completely
eliminated with fresh water added only to make up for evaporation.
• The automated aqueous washer is easy to install and operate. The labor and skill requirements are
low.
• This technology has lower cleaning chemicals consumption compared to traditional aqueous
processes.
• Continuous operation of the automated aqueous washer enhances plant efficiency.
• The technology realizes operating cost savings compared to traditional aqueous processes.
Limitations of Automated Aqueous Cleaning
• Wastewater generated must be treated and discharged.
• Some types of parts cannot be cleaned as effectively in the automated aqueous washer as in a vapor
degreaser or with a conventional aqueous process.
• The technology has a high energy requirement compared to vapor degreasing, mainly due to drying
requirements.
• The automated aqueous washer technology has a relatively high initial capital requirement.
• Drying can leave spots on aqueous-cleaned parts if rinsing is inadequate.
Aqueous Power Washing
Unlike the automated washer that has a continuous operation, most power washers are batch units.
Some continuous (conveyorized) units are also available. Whereas the automated washer is more suitable for
smaller parts, the power washer is suitable for larger parts. The aqueous power washer is useful for parts that
normally run through a vapor degreaser, alkaline tumbler, or hand-aqueous processes. Power washing, with
the correct selection of detergents, is safe for metals, plastics, varnish coatings, and etc. A power washer can
also be used for deburring and chip removal of metal parts.
Parts to be cleaned are placed inside the power washer unit on a turntable. As the turntable rotates,
the parts are blasted from all angles with water at high pressure (180 psi) and elevated temperature (140 °F to
240 °F). The force of the spray jets, the heat, and the detergent, combine to strip oil, grease, carbon, and etc.
The cycle time varies from 1 to 30 minutes depending on the type of part.
Power or jet washers are available from a variety of vendors with varying options and in various
sizes. One available option is a closed-loop system. The water is collected and sent through a filtration or
sedimentation unit or another method of contaminant removal and then sent back to the unit for reuse. This
can reduce wastewater treatment and disposal requirements as well as water consumption. While most
systems are simple single-compartment batch units, they are available also as multiple-stage cleaning units or
as conveyorized automated systems.
Most units run on 220 V electrical power. Aqueous power washers are stand-alone units and are
available in a range of sizes to fit even in crowded plants. An aqueous cleaner can be selected for use in a
power washer depending on the type of parts to be washed.
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Benefits of Aqueous Power Washing
The aqueous power washer is similar to the automated aqueous washer in that it combines
innovative process technology with the use of an aqueous (or semi-aqueous) cleaning solution. Both
technologies eliminate the use of solvents for cleaning. When combined with a "closed-loop" technology, in
which the cleaning solution is recirculated, aqueous power washing also reduces water and cleaning solution
disposal requirements. The benefits of the aqueous power washer are the following.
• Aqueous cleaners can be used in applications where solvent cleaning was used previously.
• Aqueous cleaners provide more efficient cleaning compared to manual aqueous tank cleaning.
• Cleaning times are reduced.
• The most common unit is a compact machine with one chamber as opposed to several tanks or
compartments.
• The small units are also available as portable units.
Limitations of Aqueous Power Washing
• Wastewater generated has to be treated and discharged.
• Some parts, such as electronic sensors or diaphragms, may not be able to withstand the high pressure
or temperature of the sprays.
• It is also possible that jet washers will not be able to remove baked-on dirt that cannot be removed
by scrubbing.
• Drying can leave spots on aqueous-cleaned parts if rinsing is inadequate or if the rinsewater contains
a high level of dissolved solids.
Ultrasonic Cleaning
In ultrasonic cleaning, high frequency sound waves are applied to the liquid cleaning solution.
These sound waves generate zones of high and low pressures throughout the liquid. In the zones of negative
pressure, the boiling point decreases and microscopic vacuum bubbles are formed. As the sound waves
move, this same zone becomes one of positive pressure, thereby causing the bubbles to implode. This is
called cavitation and is the basis for ultrasonic cleaning.
Cavitation exerts enormous pressures (on the order of 10,000 pounds per square inch) and
temperatures (approximately 20,000°F on a microscopic scale). These pressures and temperatures loosen
contaminants and perform the actual scrubbing action of the ultrasonic cleaning process.
Ultrasonic energy usually is applied to a solution by means of a transducer, which converts electrical
energy into mechanical energy. The positioning of the transducers in the cleaning tank is a critical variable.
The transducers can be bonded to the tank or mounted in stainless steel housings for immersion in the tank.
The number and position of immersable transducers are determined by the size and configuration of the parts,
the size of the batch, and the size of the tank. It is preferable to locate the transducers so that the radiating
face is parallel to the plane of the rack and the ultrasonic energy is directed at the work pieces.
The part being cleaned must be immersible in a liquid solution. For best cleaning results, testing
must be done with each set of parts to obtain the optimum combination of solution concentration and
cavitation levels. Temperature is the operating feature that has the most effect on the cleaning process.
Increased temperature results in higher cavitation intensity and better cleaning. This is true provided that the
boiling point of the chemical is not too closely approached. Near the boiling point, the liquid will boil in the
positive pressure areas of the sound waves, resulting in no effective cavitations.
How parts are loaded into an ultrasonic cleaner also is an important consideration. For instance, a
part with a blind hole or crevice can be cleaned effectively if it is placed so that liquid fills this hole and is
therefore subjected to cavitation action. If the hole is inverted into a liquid with the opening of the hole
facing downward, it will not fill with liquid and will not be cleaned. Overloading baskets with small parts
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JT , can sometimes result in ultrasonic energy being adsorbed by the first several layers of parts. Large volumes
of small parts can be more effectively cleaned a few at a time with relatively short cycles.
The actual basket design is another important consideration. It should ensure that transmission of
ultrasonic energy would be attenuated as little as possible. An open racking method is best whenever
possible.
There are three basic stages in ultrasonic cleaning. The first is the presoak stage, which is vital to
the efficiency of the system. In this stage, parts are placed in a heated cleaning solution that removes all
chemically soluble soil and contaminants. The second stage is the primary stage of ultrasonic cleaning, in
which scrubbing and cleaning are performed through cavitation in the solution. The third stage is rinsing of
the cleaned part. Ultrasonics also can be applied in the third stage for increased efficiency.
The primary ultrasonic cleaning system has three components: a liquid solution tank; an ultrasonic
generator, which is the power source of electrical energy; and a transducer that converts electrical energy to
mechanical energy. Most generators accept standard AC input at 60 Hz and then convert it to DC. Sizes
range from 200-W tabletop units to large 1000-W units. The optimum transducer frequency for most
applications has been found to be approximately 20 kHz.
The use of ultrasonic equipment does not require any special knowledge. The equipment can be
selected with the aid of the manufacturer and is simple to operate. There are two basic types of ultrasonic
equipment available. Electrostrictive ultrasonics employ a ceramic crystal to produce sound vibrations, while
magnetostrictive ultrasonics use metallic elements.
Ultrasonic cleaning can be applied to almost any part. Materials such as ceramic, aluminum, plastic
and glass, as well as electronic parts, wire, cables, and rods and detailed items that may be difficult to clean
by other processes, are ideal candidates for ultrasonic cleaning.
Printed circuit boards and other electronic components can also be cleaned using ultrasonics. While
there have been complaints that the 20 kHz equipment can damage fragile products such as electronic
equipment, there are 40 kHz equipment which is more applicable to the electronics industry and also reduces
the noise level associated with ultrasonic cleaning.
Although most available ultrasonic cleaning equipment is designed for batch tanks, equipment does
exist in cylindrical form. A horizontal cylindrical tube or pipe is fitted with peripheral transducers. The
transducers focus energy along the in-line centerline to allow non-contact cleaning except for the cleaning
solution. It has a concentrated high power which results in reduced cleaning times. It generally is used for
cleaning wire, strip, tube, cable, and rod configurations. The cylindrical form allows items to feed through
without bending and is easily adaptable to varying customer line speeds.
Because of the simplicity of the equipment and the decreased cleaning time, there is a saving in labor
costs when using ultrasonics. This savings, along with that from decreased solvent purchase and disposal
costs, offsets the capital cost of the equipment in a short time.
Benefits of Ultrasonic Cleaning
Ultrasonic cleaning makes use of cavitation in an aqueous solution for greater cleaning effectiveness.
The efficiency of the technology greatly reduces or eliminates the need for strong solvents. Although
solvents can be used with ultrasonic technology, and aqueous or semi-aqueous solution can be substituted for
solvents, thereby eliminating solvents from the waste stream. The wastewater generated can then be treated
on-site and discharged. Ultrasonic technology offers the following basic advantages.
• Ultrasonic cleaning can leach into crevices and small holes where conventional methods may not
reach.
• Ultrasonic cleaning removes inorganic particles as well as oils.
• Processing speed can be increased.
Health hazards are greatly reduced.
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Industrial Operations: Cleaning & Degreasing
• A lower concentration of cleaning solution can be used and possible lower toxic agents such as
neutral or biodegradable detergents can be employed.
• Although capital costs may be higher with ultrasonic cleaning, reduced solvent expense can often
pay for a system in a short period of time.
Limitations of Ultrasonic Cleaning
• Wastewater generated has to be treated and discharged.
• Ultrasonic cleaning requires that the part can be immersed in the cleaning solution.
• Dryers may need to be employed to obtain a dry part.
• Testing must be performed to obtain the optimum combination of cleaning solution concentration
and cavitation level.
• The electric power required for large tanks generally limits part sizes that can be cleaned
economically.
• The tendency for thick oils and greases to absorb ultrasonic energy may limit their removal.
• Operating parameters have to be more closely monitored.
5.5.3.2 Recycling
The goal of recycling is to recover the cleaning medium in a form suitable for reuse. Technology is
available to recycle halogenated solvents, nonhalogenated solvents, and aqueous cleaners. This may involve
filtration, decantation, distillation, concentration, or a combination of methods. For many applications,
continuous recycling can be used to maintain an acceptable level of contamination in the cleaner. The level
of cleanliness required and obtained can range from low or zero in the case of maintaining a near-virgin grade
of solvent to just maintaining an acceptable level so that parts are not over or under cleaned.
The recovery of spent solvents may be performed either on- or off-site. The recovery of emulsion
cleaners (i.e., semi-aqueous or water-soluble solvents) and aqueous cleaners is exclusively performed on-site.
The decision to recycle on- or off-site generally depends on the volume of waste to be processed, the capital
and operating costs of the system, as well as the availability of in-house expertise. If the volume of waste to
be recycled is small or if the level of in-house expertise is low, off-site recycling may be a more attractive
option. A third option is to list the spent cleaning solution on a waste exchange service which acts as a broker
to sell the spent solution to company that could use it as a raw material.
The following sections further describe the three recycling options;
• On-site recycling,
• Off-site recycling, and
• Waste exchange services;
as well as provide an overview of the basic recycling technologies available.
On-Site Recycling
On-site recycling is defined as the process of reclaiming a spent cleaning solution in or near the
original process line for reuse. The decision to recycle wastes on-site is typically based on the economics of
cleaner reuse and quality control.
Design of an on-site recycling system must be address a number of crucial elements including
chemical volatility, solubility, thermal stability, potential corrosion or reaction with materials of construction,
purity requirements for the recovered cleaner, system capacity, steam and cooling water availability, worker
exposure, regulatory permitting, and overall economics. The above factors will guide the selection process
for purchasing a specific type of recycling equipment and potentially the type of cleaner employed based on
its recyclability. Three common types of recycling technologies; gravity separation, filtration, and
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 133
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Industrial Operations: Cleaning & Degreasing
JT , distillation; are available in a wide range of sizes, material construction, and performance requirements. The
following further describes each basic type of recycling technology.
Gravity Separation
Gravity separation involves the removal of particles suspended in a liquid and is often referred to as
sedimentation. The contaminated liquid is introduced into a settling tank, and after a sufficient settling time,
the clarified liquid is drawn off from the solids resting of the bottom of the vessel. The solids are removed
and disposed. This process is widely employed as a preliminary purification or prefiltration step. Capital,
operating, and maintenance costs for a sedimentation system are low. Disadvantages of the method include
poor removal of fine colloidal particles and potential for excessive air emissions if conducted in a large open
holding tank or basin. Sedimentation is typically employed in the recycling of dirty cleanup solvents and
thinners from painting operations.
Decantation is a gravity separation technique used to separate immiscible liquids of different
densities. The mixture is slowly introduced into a decant tank where continuous-phase separation occurs.
Dust and dirt particles can interfere with the separation so they are often removed by filtration beforehand.
Decantation is often used to remove insoluble oils from spent solvents in the dry cleaning industry and to
recover semi-aqueous solvents that enter the emulsion rinse stage. The main factors in designing a decant
tank are the droplet size of the discontinuous phase and its volume fraction.
To achieve a greater degree of solid or immiscible liquid separation, the acting forces may be
increased by pumping the contaminated liquid through a hydrocyclone or centrifuge. These devices spin the
liquid and create a very large centrifugal force that acts on the suspended matter in a way similar to gravity,
except much greater. Solids are removed in the under flow of the device while clean liquid is discharged in
the overflow. As expected, capital and operating costs for these devices are greater, but so is the
effectiveness of separation. Use of a hydrocyclone to remove suspended dirt and oil from an aqueous
cleaning bath can sometime double solution life. Centrifuges are sometimes used to remove water from oils,
but they are not commonly encountered in parts cleaning operations.
Filtration
The process of filtration removes insoluble particulate matter from a fluid be means of entrapment in
a porous medium. It is often used to extend the life of a cold-cleaning bath or to continuously remove metal
fines and sludge from a vapor degreaser sump. Some of the process related factors important in the selection
of a filter system include particle size distributions, solution viscosity, production throughput, process
conditions, performance requirements, and permissible materials of construction. Common styles include bag
and disposable cartridge, although a wide array of equipment is available.
While standard filtration does not remove soluble contaminants such as dissolved oils from a
solvent, it can be used to remove solid dirt and grease particles. Passing the dirty solvent through a fine metal
screen may remove these contaminants before they have a chance to dissolve and load the solvent bath.
Routing, screening and removal of undissolved contaminants can be an effective way to extend the life of a
cold-cleaning bath.
Microfiltration systems are filtration technologies that can remove soils to a much finer degree than
standard filtration. In the field of precision cleaning, their use is essential. Typically, vapor degreasers are
equipped with a 5 or 10-|_im filter for removal of particulates. The smaller particles that are not removed
accumulate in the sump and eventually contaminate the solvent vapor and hence the assemblies being
cleaned. The use of a microfiltration system can remove particulates down to less than 0.1 |_im in size. This
minimizes the potential for particulate contamination of the solvent vapor. Because of the fine filtration
capability of the filter, removal of water, organic acids, and other soils from the solvent is feasible.
Moving beyond microfiltration, membrane filtration (which includes ultrafiltration) is capable of
removing emulsified oil and grease from aqueous cleaning solutions. Membrane filtration is sometimes so
effective that it will also remove surfactants and other special additives from the cleaner. Particles as fine as
0.01 to 0.003 |jm and organic molecules with molecular weights exceeding 500 can be removed by
ultrafiltration. Therefore, selection of a suitable aqueous cleaner and the ability to recycle that cleaner often
involves optimizing ingredients used in the formulation to removal efficiency of the system.
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Distillation
Distillation is the process of separating two miscible liquids based on the difference in their vapor
pressures. The process of distillation is commonly used to recover a clean volatile solvent (halogenated) from
a less volatile contaminant. Operation may be conducted in batch or continuous modes.
Distillation for halogenated solvents falls into one of three categories; process stills, batch stills, and
semi-portable mini-stills. Process stills are used in conjunction with vapor degreasers to provide continuous
cleaning of the solvent. Dirty solvent from the sump of the degreaser is pumped to the still for processing and
then returned to the degreaser's clean solvent storage tank. Solvent recovery with a process still typically
ranges from 60 to 80 percent. An advantage to process stills over batch stills is that the degreaser does not
have to be shut down while the solvent is being processed. Another advantage is that the level of
contamination in the degreaser stays at a steady low level. Process stills may also be used for recycling
solvent from cold -cleaning operations.
Batch distillation is performed whenever the degreaser requires cleaning; anywhere from once per
week to once per month or longer. Batch distillation is also commonly used to recycle solvent from cold-
cleaning operations. To be recycled, dirty solvent is pumped into the still, heated and condensed, and then
put back into drums or storage tanks for return to its point of use. Batch stills are typically capable of much
higher solvent recovery rates than are process stills, usually around 70 to 95 percent. The reason for this is
that waste from a process still must often be pumped out into drums while batch stills are often equipped with
lining bags that are then used to lift the waste out of the unit. Since the waste does not have to be pumped
out, the viscosity of the waste is less of an issue and higher solvent recovery can be practiced. The uses of
batch mini-stills is not common with vapor degreasing, but are widely used in maintenance parts cleaning.
If the boiling point of the solvent is high (greater than 200 °F as with perchloroethylene), distillation
can be performed under vacuum to minimize thermal decomposition of the solvent or impurities. Vacuum
distillation can also be used to recover d-limonene at low temperatures so as to avoid auto-oxidation and
polymerization. Another technique is to inject live steam into the solvent, which allows the solvent to boil at
a lower temperature. The condensate of water and solvent is then phase-separated by gravity in a decanter.
Steam injection should not be used when the solvent contains water-soluble inhibitors. The use of steam
sparging can also result in increased air emissions if the sparging and condensing equipment are not designed
and operated properly.
Benefits of On-Site Recycling
• Less waste leaves the facility.
• Tighter control of recovered cleaner purity .
• Reduced cost of liability associated with waste transport.
Limitations of On-Site Recycling
• Capital expenditure required for purchasing and installing recycling equipment.
• Additional operating costs for periodic maintenance, operation, and worker training.
• Increased liability associated with worker health, fires, leaks, and spills.
Off-Site Recycling
The second option off -site recycling of the spent cleaning solution through an outside vendor or
contractor. Most commercial recyclers readily accept halogenated or nonhalogenated solvents and recycle
them be means of distillation. The off-site recycler, under a contractual agreement, picks up the generator's
contaminated solvent, recycles it, and delivers the purified solvent back to the generator. If the generator
does not want the recycled solvent back, then he receives a lesser credit for the solvent and the recycler sells
the solvent to another user. The sludges that result from the off-site reclamation operation contain
halogentated solvent and are usually blended with nonhalogenated solvent waste and sent as fuel supplement
to cement kilns. The production of cement requires a source of chlorine, and the use of halogentated solvent
suits this need well.
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Industrial Operations: Cleaning & Degreasing
JT , Generators should be careful to maintain spent solvents in as pure a form as possible (i.e., keep all
solvents segregated) so as to maximize their recyclability. Failure to keep solvents segregated may lead to
rejection of the solvent by the recycler. Depending on the waste volumes handled, off-site recycling may be
economically favorable over on-site recycling. Off-site commercial recycling services are well suited to
small-quantity generators. The recycler may charge the generator by volume of waste accepted and later
credit the generator for the value of recoverable solvent received. Other recyclers charge a straight fee or
accept waste at no charge depending on its market value.
In selecting an off-site recycler, one should remember that the waste generator can be held liable for
the mishandling of waste by the hauler or recycler. In choosing a commercial recycling service, one should
investigate and verify the following:
• Types of wastes typically managed;
• Permits held by the facility;
• State compliance records and site inspection reports;
• Type and extent of insurance held;
• Type of record keeping and reporting practices followed:
• Availability of registered trucks and licensed haulers to transport the waste solvents;
• Distance to the recycling facility and associated transportation costs;
• Expertise of in-plant waste management personnel and process controls;
• Disposal procedures for still bottoms and solvents that cannot be recycled;
• Laboratory facilities and analytical procedures employed to ensure solvent purity;
• Availability of custom recycling services (e.g., vendor-owned recycling units that are operated at the
generators property); and
• Customer comments.
Benefits of Off-Site Recycling
• No capital cost for equipment.
• Potential for increased profit from the cost of off-site recycling in comparison to purchasing virgin
cleaning solvent.
• Reduction in raw material purchases.
Limitations of Off-Site Recycling
• Off-site recycling is not considered pollution prevention.
• Increased liability associated with off-site transfer of waste.
• Commercial recyclers generally except only petroleum based products.
Exchange Services
A third recycling option is to list the spent cleaning solution either on an information exchange or
material exchange. An information exchange acts as a clearinghouse for information on waste availability
and demand. The following information is required to list a spent cleaning solution with an exchange service:
type of waste, composition, quantity, method of delivery (i.e., drums or bulk), frequency of generation (i.e.,
one time or continuous), and regional location. Once this information is listed, the clearing-house will
provide a list of facility names that inquire about the generator's waste. All arrangements for transferring and
delivering the waste are between the generator and purchaser.
A material exchange differs from an information exchange in that it takes temporary physical
possession of the waste and may initiate or actively participate in the transfer of the waste to the user.
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Industrial Operations: Cleaning & Degreasing
Advantages of this arrangement include less involvement of the generator and receiving facility in deciding on
equitable terms and conditions (these may already be dictated by the material exchange) and the ability to
participate in an exchange without the facilities having to identify themselves with one another. A disadvantage
of a material exchange is that the generator will pay more for this service; many information exchanges are free.
Information regarding available exchanges can be obtained from state and local regulatory agencies involved in
pollution prevention or recycling activities.
Benefits of Exchange Services
• No capital cost for equipment.
• Potential for increased profit from the sale of spent cleaning solutions.
• Reduces facility hazardous waste generation (assuming the spent solution is used by the purchaser as a
raw material).
Limitations of Exchange Services
• Increased liability associated with off-site transfer of waste.
• Market demand fluctuates based on supply and demand.
• Sale price may fluctuate greatly over time.
5.6 Chemical Etching
The following section provides a process description, waste description and a broad range of pollution
prevention opportunities that can be implemented to improve chemical etching operations.
5.6.1 Process Description
Chemical etching is the process of depositing a conversion coat onto a metal substrate to enhance the
corrosion and adhesion properties of the metal prior to applying a paint coating. The two most common types of
chemical etching are Phosphating on steel or zinc, and Chromate Conversion Coating (CCC) on aluminum.
5.6.1.1 Phosphating
Phosphating (i.e., iron and zinc phosphating) is the process of depositing a conversion coating onto steel or
galvanized steel to enhance the paint coating's adhesion to the metal surface. This strengthened bond enhances the
coatings' ability to resist corrosion. Typically, iron phosphating is conducted using a three-step process that includes
two rinse steps. To achieve a primer - topcoat system with enhanced corrosion resistance, a five-step process that
comprises three rinse steps is used. (See Exhibit 5.4.) Depending on their size and the volume throughput
requirements, workpieces undergo phosphating either in batches by immersion or as individual pieces that are sprayed
as they are moved through the process by conveyor. For most pretreatment processes, the phosphating stage is
followed immediately by a dry -off oven, at a temperature that will evaporate water as quickly as possible to prevent
flash rusting. For ovens used to dry particularly bulky pieces, the temperature may be as high as 400 °F.
Exhibit 5.4: Five-stage Iron or Zinc Phosphating Process
5.6.1.2 Chromate Conversion Coating
Degrease
(Hot)
Water Rinse
(Ambient)
Iron or Zinc
Phosphate
(Hot)
Water Rinse
(Ambient)
Seal Rinse
(Ambient)
Stepl
Step:
Step:
Step 4
Step 5
Chromate Conversion Coating, a chromate oxide formulation, is the process of depositing a conversion
coating onto aluminum. For low-value end products, aluminum work pieces are often pretreated using an
aqueous (i.e., nonchromate) formulation. Common trade names for chromate conversion coating solutions
Notes
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Notes
Industrial Operations: Chemical Etching
include Alodine® 1200 and Accelagold®. The active ingredient in these solutions is hexavalent chromium in
chromate (CrO4~2) and dichromate (Cr2O7"2) chemical forms.
Conversion coatings are widely used in the manufacture and maintenance of aluminum prior to
painting or as a final finish. In most cases, the conversion coating imparts corrosion protection and provides
an excellent base for paint adhesion. In a smaller number of cases the conductive properties of the coating
allow it to be used for electrical bonding applications. Recent developments in conversion coating
formulations have lead to the development of nonchromate conversion coatings for limited applications.
A typical process for applying a conversion coating to aluminum with either a chromate or
nonchromate formulation, consists of a seven-step process that includes two rinse steps. (See Exhibit 5.5.)
Exhibit 5.5: Typical Conversion Coating Process for Aluminum
Degrease
(Hot)
Water Rinse
(Ambient)
Deoxidize
(120 F)
Water Rinse
(Ambient)
Chromate or
Nonchromate
Conversion
Coating
Water Rinse
(Ambient)
Seal Rinse
(Ambient)
Step 1 Step 2
5.6.2 Waste Description
StepS
Step 4
StepS
Step 6
Step 7
Chemical etching, either phosphating or chromate conversion coating regardless of complexity
requires four basic steps; Degrease, Pre- Rinse, Chemical Etch, and Post- Rinse. Each phase of the chemical
etching process generates air emissions and solid waste. This section of the document deals with the waste
streams generated from the pre-rinse, chemical etching, and post-rinse process steps. Detailed information on
Degreasing is contained in Section 5.5, Cleaning & Degreasing.
Pre-rinsing, after degreasing and before chemical etching, is essential to prevent contamination and
to maintain the pH of the phosphate bath, but rinsing can generate high volumes of wastewater. A more
efficient process, cost savings and wastewater minimization can be attained through process modifications.
Exhibit 5.6 describes the basic waste streams generated from a typical chemical etching operation.
Exhibit 5.6: Simplified Material Balance of a Chemical Etching Process Step
Metal ^
Substrate
Degrease
(Not covered under
this section)
Pre -Rinse
Wastewater
Ei
D
VOC Heavy Metal
nissons Emissions
f t
Chemical
Etching
Post-Rinse
^ Chemically Etched
Metal Substrate
4 + + +
rag-out Spent Heavy Metal Wastewater
Loss Solution Sludge
For certain types of operations, a post-rinse stage is included to remove drag-out of unreacted acids,
sludge deposits, corrosive salts, and other contaminants that remain on the work piece following chemical
etching. Because more rinse cycles are required with post-rinsing than pre-rinsing, the post-rinse can also
generate high volumes of wastewater. However, efficient process modifications can reduce overall costs and
wastewater.
5.6.3 Pollution Prevention Opportunities
Pollution prevention opportunities for the chemical etching industry exist in both the source
reduction and recycling categories. These opportunities are discussed in further detail below.
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Industrial Operations: Chemical Etching
5.6.3.1 Source Reduction
The chemical etching industry has many opportunities for pollution prevention through source
reduction. The source reduction possibilities are typically separated into (1) process efficiency and (2)
alternative sealing processes.
Process Efficiency
A key method to waste minimization in the chemical etching stage of metal finishing is source
reduction via process efficiency. Applying conversion coatings to work pieces with chemicals that are
appropriate for the particular metal substrate can minimize the generation of heavy metal sludge in immersion
baths or from conversion coating spray operations. If the color of a deposited coating varies from the
coloration associated with the particular formulations, the process operator should check for problems such as
exhaustion of the solution. Both the monitoring of operations and the replenishing of chemicals can be
automated to ensure maximum process efficiency.
In general, some amount of heavy metal sludge is generated in all chemical-etching processes. In
the worst case, the use of chemicals that are not well suited to a work piece's metal substrate will iail to
deposit a coating and will generate an excess of heavy metal sludge. For example, iron phosphate cannot be
used to apply a conversion coating to galvanized steel because the acid will react with the zinc in the substrate
but not the iron, resulting in an excess of zinc sludge. Instead, a zinc phosphate formulation should be used to
apply a conversion coating on galvanized steel. Similarly, an aluminum substrate will not receive a
conversion coating from iron phosphate and will generate an excess of aluminum sludge. Aluminum
phosphate should be used to apply conversion coatings to aluminum work pieces.
Decreasing Before Chemical Etching
The removal of grease is an important step before chemical etching. Detailed information on the
degreasing process is contained in Section 5.5, Cleaning & Degreasing.
If the degreasing formulation is properly selected for an immersion process, contaminants from work
pieces will either sink to the bottom of the tank or float to the top (i.e., the oils will float rather than emulsify).
The line operator can then easily filter out the insoluble sludges or separate off the oils. Sludge material can
be dried and then disposed of as hazardous waste, whereas the oils can be sent off site for fuels blending.
Benefits of Degreasing before Chemical Etching
• Remove trace contaminants from the work piece.
• Minimize the likelihood of alkaline salts and grime contaminating the phosphate bath.
• Prevent the alkaline salts from raising the pH of the phosphate bath
• Increase bath life.
Limitations of Degreasing before Chemical Etching
• Degreasing operation may generate a hazardous waste stream or require the use of toxic chemicals to
remove the trace contaminants.
Rinsing after Degreasing
Before chemical etching, a metal work piece should be thoroughly rinsed to remove any surface
residue. While the surfactants in degreasing formulations are essential for removing contaminants from a
work piece, their typically low surface tension makes them extremely difficult to remove without a thorough
rinse. Surfactants and other contaminants that remain on the surface of the work piece following degreasing
can undermine the integrity of the metal deposition and ultimately the quality of the finished piece. An
additional reason for including a rinsing step at this point of the processes is to minimize the amount of drag-
in from high alkaline degreasing baths to the near-neutral chemical etching bath. Drag-in from a degreasing
bath or from an exhausted post-degreasing rinse will gradually neutralize the chemical etching bath until little
or no metal will deposit on the work piece. Thus, eliminating this rinsing step can dramatically shorten the
useful life of the chemical etchant bath, which in turn creates higher raw chemical costs and increased waste
stream volumes. The following describes three rinsing systems that can be effectively used in chemical
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 139
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Notes
Industrial Operations: Chemical Etching
etching operations to extend bath life and improve finished product quality; rinsing by immersion, spray rinse
system, and counter-flow rinsing.
Rinsing by immersion is ideal for situations in which the production flow through the process is
relatively slow (i.e., less than 2 ft/min on a continuous basis) and production is intermittent. A facility
operator considering the installation of an immersion system should consult with a specialized contractor about
design and layout.
Exhibit 5.7 illustrates two typical immersion system layouts. Exhibit 5.7(a) shows the more
common layout for a typical batch operation; Exhibit 5.7(b) shows a less-common layout that would rely on a
conveyor to carry work pieces in and out of the tanks in a continuous process.
A spray rinse system is often recommended for a paint and coatings operation that has a conveyor
line with a speed greater than 2 ft/min. Facility operators considering the installation of a spray washer line
would be well advised to consult with a specialized contracting company. In general, when planning for a
spray washer, the facility operator needs to consider how the layout will affect process flow. The spray
washer system must be designed so that work pieces easily pass through the pretreatment process, allowing
adequate time for the solutions to drain between each tank.
A spray washer system cannot be properly designed unless the conveyor line speed and the part sizes
are known. The dimensions of the spray tunnel must be based on the silhouette of the maximum part size.
The spray nozzles inside the tunnel must be located on risers so that they are only a few inches away from the
largest part.
Exhibit 5.7: Immersion Rinse System Schematic
H
H
H
(a) Immersion tanks laid out for batch operation
Tank#l
Tank #2
Tank #3
Tank #4
(b) Immersion tanks laid out for continuous conveyorized operation
When possible, a system should be designed so that spray rinses precede every process tank.
Although the rinses are at low pressures, they enhance pretreatment by preventing the contamination of tanks
with chemicals from a preceding tank. Operation of such spray washers is relatively inexpensive because low
volumes of water are used.
Given the vast number of work pieces and parts of varying size that can pass through a spray system
each day for certain operations, nozzles can often be misdirected. Thus, a maintenance engineer should
routinely check to see that spray nozzles are pointing in the correct direction.
A design feature often overlooked regards conveyors that pass work pieces through the tunnel, dry-
off oven, and spray booths, as shown in Exhibit 5.8. The advantage of such design is that line workers are
only needed for hanging and offloading work pieces.
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Industrial Operations: Chemical Etching
Exhibit 5.8: Schematic of a Conveyorized Paints and Coatings Operation
Priming Spray
Booth
Curing Oven
Curing or
Baking Oven
Top Coat
Spray Booth
Prepping Area
Counter-flow rinsing is an effective method for thoroughly washing contaminants from the work
pieces after degreasing or phosphating, in addition, it is an effective method for minimizing water usage.
Fundamentally, a counter-flow rinsing system is a sequence of baths in which replenished rinse water moves
in opposite direction of the process flow. Thus, the work piece progresses from dirtier to cleaner rinse water.
The system maximizes water use by replenishing the rinse water in the processing bath. Rinse water effluent
is ultimately released to the wastewater treatment system as overflow from the first (dirtiest) bath in the
sequence.
Benefits of Rinsing after Degreasing
• Removes surfactants and other contaminants that can undermine the integrity of the metal deposition
and the quality of the finished piece.
• Minimizes the amount of drag-in from high alkaline degreasing baths to the near-neutral chemical
etching bath.
• Reduces the need for raw chemicals therefore decreasing the cost.
• Increases the useful life of the chemical etchant.
• Longer bath life reduces wastewater.
• Thorough cleaning promotes proper adhesion.
Limitations of Rinsing after Degreasing
• Often requires large amounts of floor space.
• Capital and maintenance costs may be high.
Check for Cleanliness Prior to Etching
The cleanliness of the substrate as the work piece enters the phosphating step or as it leaves the final
rinse tank should pass the water break-free or the towel-wipe test. In the water break-free test, a squirt bottle
is used to pour deionized water over a cleaned substrate. The water should run off in a sheet rather than bead
up. While the test may demonstrate that oils and greases have been removed from the work piece, it will not
confirm that the surfactants from the degreaser have also been removed. To do this, one needs to rinse the
Notes
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Industrial Operations: Chemical Etching
JT , part with a small quantity of deionized water and then determine the pH of the water. This can easily be done
using pH papers.
To determine that metal fines, smut, and other contaminants have been removed, a clean paper towel
should be wiped across the wet surface of the work piece. Whereas the test may not always result in a
perfectly clean towel, relative changes in cleanliness can be assessed.
Benefits of Checking for Cleanliness
• Demonstrates that oils and greases have been removed.
• Minimizes contamination of the chemical etching bath.
• Minimizes the amount of drag-in from high alkaline degreasing baths to the near-neutral chemical
etching bath.
• Insures longer bath life that reduces wastewater and raw chemical usage.
• Indicates the effectiveness of the utilized rinses
Limitations of Checking for Cleanliness
• Does not confirm that surfactants from the degreaser have been removed.
• A combination of both the water break-free and the towel-wipe test must be used to ensure
cleanliness.
Choosing a Phosphate Formulation and Qualifying the Phosphate Coating
Paints and coatings facility operators typically confer with chemical vendors in the selection of a
phosphate formulation. Indeed, one vendor may be able to offer a better formulation than another vendor,
especially if the performance requirements are unique.
The choice of formulation can be significant in terms of achieving optimum coating properties. It is
especially prudent for the operator to discuss special requirements with a chemical vendor, particularly if the
finished work piece will be subjected to aggressive environments. In some situations, laboratory tests may
need to be conducted to verify that the selected coating will be able to provide the required finish. In general,
choosing a formulation on the basis of price is inadvisable.
Benefits of Choosing the Proper Phosphate Formulation
• The proper etchant formulation will achieve optimum coating properties.
• Proper formulas will reduce waste stream of ruined pieces.
Limitations of Choosing the Proper Phosphate Formulation
• Lab tests may be required to determine the optimum formula.
• The cost of the optimum formula may be prohibitive.
• The optimum formulation may be more environmentally hazardous than a substitute.
Alternative Sealing Processes
Some operations subject work pieces to a final rinse bath after chemical etching to harden the
deposited coating, providing an enhanced long-term corrosion resistance. This process step is included in
operations for a wide range of industries, most of which pertain to high value work pieces. Sealing is
accomplished with both a chromate and a nonchromate process. Typically, work pieces are sealed using a
rinse of deionized water mixed with a small concentration of chromate or nonchromate additive.
• Chromate Sealers - seek out areas of the coating where the phosphate failed to convert the base
metal. The chemicals in the chromate sealer then react with the exposed substrate, in much the same
way as the phosphating process itself, to form a corrosive resistant film. Operators have used
chromate-based rinses for many years as an effective means of sealing the phosphate coating on the
work piece. Chromate rinse additives are based on either a hexavalent or trivalent chromium. While
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Industrial Operations: Chemical Etching
both form pollutants of concern, hexavalent chromium is particularly toxic and is a suspected
carcinogen; thus, residuals must be disposed of as hazardous waste, which can add significant costs
to the process.
• Nonchromate Sealers - also form a protective film over exposed areas of the substrate, although not
through a chemical reaction with the base metal. Several nonchromate sealant formulations have
been developed, but their effectiveness for enhancing the durability of a work piece as compared
with chromate-based sealers has yet to be fully established. Nonetheless, when the finished work
piece will be used in applications requiring less-demanding corrosion resistance, nonchromate
sealers can present an attractive alternative. The great advantage that nonchromate sealers hold over
chromate based formulations is that they are non-toxic. Thus, an operator can realize significant
benefits by reducing or eliminating the need to dispose of hazardous residuals.
Benefits of Alternative Sealing Processes
• Sealers harden the deposited coating, providing an enhanced long-term corrosion resistance.
• Nonchromate based sealers are non-toxic, therefore they reduce the cost of disposal.
• Nonchromate sealers can work in applications requiring less-demanding corrosion resistance.
Limitations of Alternative Sealing Processes
• Chromate sealers are toxic, therefore increasing the disposal cost.
• Chromate based sealers are suspected carcinogens.
• Non-toxic nonchromate based sealers cannot enhance the durability of a work piece as well as toxic
chromate based sealers.
• Chromate sealers contain environmentally detrimental hexavalent or trivalent chromium.
5.6.3.2 Recycling
In process recycling phosphate baths and rinses can be used to extend bath life and reduce waste
volumes. The recycling process is accomplished by raising the pH of an exhausted phosphate bath or
collected spray drainage, which will precipitate out any heavy metal sludge. The wastewater can then be run
through a centrifuge to collect the sludge into a cake, which must be disposed of as hazardous waste. For
more information on recycling technologies to remove heavy metals and suspended solids, see Section 5.5,
Cleaning and Degreasing.
A growing trend in phosphate waste recycling is to use ultrafiltration to separate and reuse rinse
water and concentrates. This additional step maximizes water use and reduces the amount of wastewater
discharged to local treatment works.
Benefits of In-Process Recycling
• Reduces the mass of materials being disposed.
• Reduces amount of chemicals used, thereby reducing raw chemical costs.
• Maximizes water use.
• The process takes place on-site, therefore reducing transportation costs.
Limitations of In-Process Recycling
• The hazardous sludge cake has to be disposed of.
5.7 Plating Operations
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve plating operations.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 143
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Industrial Operations: Plating Operations
Notes 5.7.1 Process Description
Metal finishing comprises a broad range of processes that are practiced by most industries engaged
in manufacturing operations using metal parts. Typically, metal finishing is performed on manufactured parts
after they have been shaped, formed, forged, drilled, turned, wrought, cast, etc. A "finish" can be defined as
any final operation applied to the surface of a metal article in order to alter its surface properties to achieve
various goals. Metal finishing operations are intended to increase corrosion or abrasion resistance, alter
appearances, serve as ai improved base for the adhesion of other materials (e.g., other metals, paints,
lacquers, oils), enhance frictional characteristics, add hardness, improve solderability, add specific electrical
properties, and/or improve the utility of the product in some other way.
Plating processes are typically batch operations, in which metal objects are dipped into and then
removed from baths containing various reagents to achieve the desired surface condition. The processes
involve moving the object being coated through a series of baths designed to produce the desired end product.
These processes can be manual or highly automated operations, depending on the level of sophistication and
modernization of the facility and the application. Most metal plating operations have three basic steps: (1)
surface cleaning and preparation, (2) surface modification, and (3) rinsing or other work piece finishing
operations to produce the final product.
5.7.1.1 Surface Cleaning and Preparation
Preparation cycles vary depending on the particular substrate being electroplated. Often only slight
variations in substrate composition significantly influence the preparation process. Heat treating variations
also contribute to the complications of preparation. Determining an optimum preparation process for a given
material often becomes a matter of trial and error. Poor preparation of a substrate can result in loss of
adhesion, pitting, roughened coating, lower corrosion resistance, smears, and stains. Because plating takes
place at the exact molecular surface of a work, it is important that the substrate be clean and receptive to the
plating. The soils encountered in electroplating processes can be organic, (e.g., oil greases, and other
cleaning compounds) or inorganic, such as oxides and heat-treat scales. Some plating baths can clean
surfaces and thus tolerate minimally cleaned surfaces, but the majority needs surfaces cleaned to near
perfection. No simple, universal cleaning cycle exists for electroplating. Several methods and cleaning
solutions may be used in a single-plating process.
5.7.1.2 Surface Modification
Surface modification is typically achieved through electroplating, which passes an electrical current
through a solution containing dissolved metal ions and the metal object to be plated. The metal substrate
serves as the cathode in an electrochemical cell, attracting metal ions from the solution. Ferrous and non-
ferrous metal objects are plated with a variety of metals, including aluminum, brass, bronze, cadmium,
copper, chromium, iron, lead, nickel, tin, and zinc, as well as precious metals, such as gold, platinum, and
silver. Controlling a variety of parameters, including the voltage, amperage, temperature, residence times,
and the purity of bath solutions regulates the process. Plating baths are almost always aqueous solutions;
therefore, only those metals that can be reduced from aqueous solutions of their salts can be electrodeposited.
The only major exception is aluminum, which can be plated from organic electrolytes. If the production
allows, electroless plating is also used. Electroless plating follows similar steps to electroplating but involves
the deposition of metal on a substrate without the use of external electrical energy.
5.7.1.3 Rinse
A final rinse typically follows the bath process, and is important in the removal of a thin film of
plating solution from the surface of the substrate. Good rinsing requires good water, not too cold, vigorous
agitation, and time. Water at S7°C is a poor rinse; water 30-35°C gives a good rinse. Time and agitation
allows the rinse water to penetrate, to dilute, and to remove the substantive films. A two-minute dip in each
agitated rinse has often produced good work having good adhesion, when one-minute dips have failed.
5.7.2 Waste Description
The plating industry is somewhat unusual among manufacturing industries at present because the
vast majority of the chemicals used end up as waste. The current inefficiency of material use is due to the
inherent characteristics of the processes employed where parts are immersed into concentrated tanks of
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Industrial Operations: Plating Operations
chemicals and subsequently rinsed with fresh water. The resultant wastewater makes up the greatest volume
of waste material from plating operations.
Wastewater is generated during rinsing operations. Rinsing is necessary to remove the thin film of
concentrated chemicals (i.e., drag-out) that adheres to parts after their removal from process baths (e.g.,
plating solution). Wastewaters are usually treated on-site. This treatment generates a hazardous sludge that
must be disposed of in an approved landfill or sent to a recovery site for metals reclamation.
Residual metals in wastewaters discharged by plating shops to municipal sewer systems, as
permitted, where it will be treated further. Process baths are discharged periodically when they lose their
effectiveness due to chemical depletion or contamination. Accidental discharges of these chemicals also
occur sometimes (e.g., when a tank is overfilled). These concentrated wastes are typically treated on-site or
hauled to an off-site treatment or recovery facility.
With respect to air emissions, the greatest concerns with plating shops are solvents and chromium.
Solvents are partly evaporated during degreasing operations. Contaminated liquid solvents are either
recovered by distillation (on-site or off-site) or sent for disposal (incineration). Chromium is released to the
air by plating and anodizing processes. Most shops do not have controls for organics; however, some larger
plants use carbon adsorption units to remove hydrocarbons. Chromium emissions and other heavy metals are
frequently controlled by the use of wet scrubbers. The discharge of these systems is sent to the wastewater
treatment system and combined with other wastewaters for processing.
Plating also generates other miscellaneous sources of wastes, including floor wash waters, storm
water, and chemical packaging wastes.
Exhibit 5.9 identifies the major waste streams from typical metal plating operations, as well as the
major waste constituents of concern from both regulatory and environmental risk perspectives.
5.7.3 Pollution Prevention Opportunities
During the past 10 to 15 years, innovative members of the plating industry have made significant
strides in developing and implementing preventative methods of pollution control. In some cases, waste
minimization methods and technologies have been responsible for reducing waste volumes by up to 90
percent. Associated with the decrease in waste generation are reductions in end-of-pipe equipment purchases,
improvements in effluent compliance, improvements in product quality, and significant cost savings in raw
materials.
Exhibit 5.10 presents waste minimization opportunities applicable to the metal plating industry. It
should be noted that many lower technology waste minimization options, including process recovery and
reuse, improved operating procedures, and use of waste exchanges and off-site recovery options, represent
significant opportunities for waste reduction often with relatively low investment requirements.
Exhibit 5.11 presents a more detailed identification of the specific waste reduction techniques that
have documented applicability to metal plating processes and briefly describes the applications and
limitations of each. All of these methods are described in detail in the body of the paper with discussions of
the current use and applicability, limitations, and costs associated with purchasing, installing, and operating
the various technologies.
Notes
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Industrial Operations: Plating Operations
Notes
Exhibit 5.9 Major Metal Plating Wastes and Constituents
Air Emissions
Solvent releases from degreasing operations
Chromium
Waste Waters
Rinse Water
Spent Baths
Scrubber Slowdown
Cooling Water
Solid and Hazardous Wastes
Solvent Wastes
-spent contaminated solvents
-still bottoms from solvent recovery
Spent Process Solutions
-alkaline cleaners
-acid etching solutions
-plating solutions
Waste Treatment Sludges
Key Constituents
Solvents
-1,1,1 -Trichlorethane
-Triclorethylene
-Perchloroethylene
-Chloroflurocarbons
-Methylene chloride
-Acetone
-Toluene
-Methyl Ethyl Ketone
-Methyl Isobutyl Ketone
Metals
-Cyanide
-Chromium
-Cadmium
-Nickel
-Aluminium
-Copper
-Iron
-Lead
-Tin
-Zinc
5.7.3.1 S ource Reduction
Pollution from conventional plating methods is typically high because the vast majority of the
chemicals used end up as waste. The current inefficiency of material use is due to the inherent characteristics
of the processes employed. The main focuses in cleaner technologies for plating are:
• Product Replacements -could be used in place of the metal plating therefore eliminating the need for
the conventional plating process in particular situations.
• Alternative Processes - replace the conventional plating process. They may perform as well as
plating done by conventional methods, and reduce waste.
• Process Efficiency - reduces the amount of waste created during the traditional plating process.
• Materials Management - reduces the material usage through improved management practices.
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Product Replacements
Product replacements may be utilized for decorative coatings, but for technical purposes metal
coatings are essential. Hard coated metals are expected to resist acidic attack, combat high temperatures, and
reduce friction. While paint and plastics have limited replacement values as decorative coatings, they cannot
withstand the abuse that hard coated metals stand up to. Paint and plastics have been used as product
replacements for hard coated metals successfully in very selective decorative coating applications. The act of
eliminating the plating operation from a product design is best achieved during product design.
Exhibit 5.10 Waste Minimization/Pollution Prevention Methods and Technologies
= LEAST PREFERRED OPTION
Product Changes
and Process ' ^
Substitution
»
»>
»>
»
»>
>
Alternative
Products/
Processes
Reduce/Eliminate
use of Chlorinated
Solvents
Reduce/Eliminate
use of Cyanide
Reduce/Eliminate
use of Cadmium
Reduce/Eliminate
use of Chromium
Reduce/Eliminate
use of other
Hazardous
Materials
Operatioon
Process
Process
Solution
Maintance
Chemical
Recovery
Treatment/
Off-site Recycle
Alternative Processes
Recently, alternative processes to the conventional plating process have been developed. Viable
replacements may be able to reduce or eliminate the wastes associated with the bath process. The alternative
processes are separated into the following categories.
• Chemical Vapor Deposition
• Physical Vapor Deposition
• Thermal Spray Technologies
Notes
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Industrial Operations: Plating Operations
Exhibit 5.11 Waste Minimization Opportunities Available to the Metal Plating Industry
Category
Examples
Applications
Limitations
General Waste
Reduction Practices
Improved operating procedures
Drag-out reduction
Rinse-water use reduction
Air emissions reductions
Applicable to all conventional plating
operations
Should be considered standard operating
procedures and/or good design
Cost benefits typically outweigh any
necessary expenditures
• Existing facilities may be able to
accommodate changes due to process
configuration, space constraints, etc.
Alternative
Processes
Thermal Spray Coatings
Vapor Deposition
Chemical Vapor Deposition
Primarily repair operations although they
are now being incorporated into original
manufacturing
Primarily high-technology applications
than can bear additional costs
Expected to improve product quality and
life
Technologies in varying states of
development; commercial availability may be
limited in certain areas
Expense often limits application to expensive
parts (e.g., aerospace, electronics, military)
May require improved process controls,
employee training, and automation
Process Solution
Maintenance
Convention Maintenance
Methods
Advanced Maintenance Methods
Process Monitoring and Control
Conventional methods applicable to all
plating operations
Advanced methods may require significant
changes in process design, operation, and
chemistry
Application limited for some plating
process/technology combinations (e.g.,
microfiltration not applicable to copper or
aluminum)
Chemical Recovery
Technologies
Evaporation
Ion exchange
Electrowinning
Electrodialysis
Reverse osmosis
• Requires significant engineering,
planning, and characterization of process
chemistry
Costs are highly variable for advanced
methods
Applications must be carefully tailored to
process chemistry
Off-Site Metals
Recovery
Filtration
Ion exchange
Electrowinning
Electrolytic Recovery
• Metal-bearing wastewater treatment
sludge
• Waste materials must be acceptable to
recyclers
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Chemical Vapor Deposition
In Chemical Vapor Deposition (CVD) processes, a reactant gas mixture impinges on the substrate
upon which a deposit is made. The different variations of CVD are distinguished by the manner in which the
precursor gases are converted into the reactive gas mixture. Typically in CVD, gas precursors are heated to
form a reactive gas mixture. A precursor material, otherwise known as a reactive vapor delivers the coating
species. It is usually in the form of a metal halide, metal carbonyl, a hybrid, or an organmetallic compound.
The precursor may be in either gas, liquid or solid form. Gases are delivered to the chamber under normal
temperatures and pressures, while solids and liquids require high temperatures and/or low pressure in
conjunction with a carrier gas. Once in the chamber, energy is applied to the substrate to facilitate the
reaction of the precursor material upon impact. The ligand species is liberated from the metal species to be
deposited upon the substrate to form the coating. Since most CVD reactions are endothermic, regulating the
amount of energy input may control the reaction. The most useful CVD coatings are nickel, tungsten,
chromium, and titanium carbide.
The steps in a generic CVD process are:
1. Formation of the reactive gas mixture;
2. Mass transport of the reactive gases through a boundary layer to the substrate;
3. Absorption of the reacts on the substrate;
4. Reaction of the absorbents to form the deposit; and
5. Description of the gaseous decomposition products of the decomposition process.
Benefits of Chemical Vapor Deposition
• Controls the microstructure and/or chemistry of deposited material.
• Evenly coats corners, holes, and irregularities.
• The CVD coating process does not involve a bath operation, therefore eliminating the
environmentally hazardous waste released due to drag-out.
Limitations of Chemical Vapor Deposition
• The substrate must be thoroughly cleaned prior to deposition.
• Reacted and unreacted chemical vapors may be released to the environment if a proper exhaust
system is not in place.
• The deposition chamber must be clean, leak-tight, and free from dust and moisture.
• Toxic, corrosive, and flammable materials are produced and must be recovered and disposed of.
• Very expensive start-up cost.
• Hazardous or toxic chemicals may be produced due to improper precursor chemical selection.
Physical Vapor Deposition
Physical Vapor Deposition (PVD) methods are clean, dry vacuum deposition methods in which the
coating is deposited over the entire object simultaneously, rather than in localized areas. PVD technologies
are generally classified into the following categories.
• Sputtering - is an etching process for altering the physical properties of the surface in which the
substrate is eroded by the bombardment of energetic particles. The sputtering process has an in-situ
cleaning effect, therefore does not require the substrate to be spotlessly clean. Sputtering deposits
are typically thin, ranging from 0.00005 mm to 0.01 mm. Compared to other deposition processes,
sputtering is relatively inexpensive.
• Ion Plating - is separated into either plasma based or ion beam enhanced deposition. In plasma-
based ion plating the substrate is in the proximity to the plasma and ions are accelerated from the
plasma by a negative bias on the substrate, while ion beam enhanced deposition the ions are
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 149
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Industrial Operations: Plating Operations
JT , accelerated from an ion gun or other source. Titanium, aluminum, copper, gold, and palladium are
typically coated with the ion plating method. A benefit of both ion plating methods is that the
substrate does not have to be extremely clean before plating. Capitol costs for this technology are
typically high; therefore it is used in applications where high value-added equipment is being coated.
• Ion Implantation - does not produce a discrete coating; the process alters the elemental chemical
composition of the surface substrate by forming an alloy with energetic ions. All surface
contaminants must be removed prior to plating using ion implantation.
All three PVD methods allow coatings to be deposited as thin as 0.00005mm and as thick as
0.025mm. Most commonly chromium, titanium, gold, silver, and tantalum are coated.
All reactive PVD hard coating processes combine:
1. A method for depositing the metal;
2. Combining with an active gas, such as nitrogen, oxygen, or methane; and
3. Plasma bombardment of the substrate to ensure a dense, hard coating.
Benefits of Physical Vapor Deposition
• Even deposition rates.
• The PVD coating process does not involve a bath operation, therefore eliminating the
environmentally hazardous waste released due to drag-out.
• High resistance to friction.
• PVD typically requires less substrate cleaning than conventional plating therefore reducing the
amount of cleaning solvents entering the waste stream.
• PVD does not add any new toxic waste streams.
• Good adhesion to the substrate.
Limitations of Physical Vapor Deposition
• High start up costs.
• The coating may be contaminated with other molecules if the work area is not properly prepared.
• PVD produces waste streams from blasting media and solvents, bounce and over spray particles, and
grinding particles.
Thermal Spray Technologies
Thermal Spray coatings can be sprayed from rod or wire stock or from powdered materials. The
material (e.g. wire) is fed into a flame where it is melted. The molten stock is then stripped from the end of
the wire and atomized by a high velocity stream of compressed air or other gas, which propels the materials
onto a prepared substrate or work piece. Depending on the substrate, bonding occurs either due to
mechanical interlock with a roughened surface, due to localized diffusion and alloying, and/or by means of
Van de Waals force (i.e., mutual attraction and cohesion between the surfaces). Thermal spray technologies
can be categorized into the following five methods.
• Combustion Torch/High Velocity Oxy-Fuel - has a very high velocity impact, and coatings exhibit
little or no porosity. Deposition rates are relatively high, and the coatings have acceptable bond
strength. Coating thickness ranges from 0.000013 to 3.0 mm. Some oxidation of metallics or
reduction of some oxides may occur, altering the coating's properties.
• Combustion Torch/Detonation Gun - produces some of the densest of the thermal coatings. Almost
any metallic, ceramic, or cement materials that melt without decomposing can be used to produce a
coating. Typical coating thickness ranges from 0.05 to 0.5 mm, but both thinner and thicker coatings
can be used.
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• Combustion Torch/Flame Spraying - is noted for its relatively high deposited porosity, significant
oxidation of the metallic components, low resistance to impact or point loading, and limited
thickness (typically 0.5 to 3.5 mm). Advantages include the low capital cost of the equipment, its
simplicity, and the relative ease of training the operators. In addition, the technique uses materials
efficiently and has a low associated maintenance cost.
• Electric Arc Spraying- produces coatings with high porosity and low bond strengths. Coatings can
range from a few hundredths of a mm to almost unlimited thickness, depending on the end use. It
can be used for simple metallic coatings, such as copper and zinc, and for some ferrous alloys.
Industrial applications include coating paper, plastics, and other heat sensitive materials for the
production of electromagnetic shielding devices and mold making.
• Plasma Spraying - is a variable technique, which can produce coatings a wide range of selected
physical properties, such as coating with porosities ranging from essentially zero to high porosity.
The spraying can achieve thickness from 0.3 to 0.6 mm, depending on the coating and the substrate
material. Sprayed materials include aluminum, zinc, copper alloys, tin, molybdenum, some steels,
and numerous ceramic materials.
Of the thermal spraying techniques, flame spraying and high velocity oxy -fuel are relatively
inexpensive in comparison to the detonating gun, electric arc furnace, and plasma spray. The five techniques
all follow the same basic steps summarized below.
1. Substrate preparation - usually involves scale, oil, and grease removal as well as surface
roughening. Roughening is necessary for most of the thermal spray process to ensure adequate
bonding of the coating material.
2. Masking and fixturing - limits the amount of coating applied to the work piece in order to remove
over spray through time consuming grinding and stripping after deposition.
3. Coating - is affected by particle temperature, velocity, angle of impact, and extent of reaction with
gases during the deposition process. The geometry of the substrate also effects the coating since the
special properties vary from point to point on each piece.
4. Finishing - is necessary in many applications. Typically after the deposition process, grinding and
lapping techniques are utilized.
5. Inspecting - involves the verification of dimensions and a visual examination for pits, cracks, etc.
6. Stripping - when necessary, is done chemically in acids or bases, electrolytically, or in fused salts. If
none of these techniques are possible, mechanical removal by grinding or grit blasting is necessary.
Benefits of Thermal Spray Technologies
• Thermal spray technologies do not involve a bath operation, therefore eliminating the
environmentally hazardous waste released due to drag-out.
• Efficiently uses materials consequently reducing the amount of waste generated, and the cost
associated with raw materials.
• Variability in the process allows for a wide range of thickness and porosities.
• Can normally be stripped chemically, electro lytically, or in fused salts.
Limitations of Thermal Spray Technologies
• High noise generation (between 80 db to more than 140 db).
• Environmental concerns including the generation of dust, fumes, over spray, and intense light.
• Nondestructive testing of the coating has largely proven unsuccessful.
• Water curtains designed to capture over spray and fumes discharge contaminated wastewater.
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JT , Process Efficiency
Through process efficiency the waste streams involved with conventional plating systems can be
reduced. Small changes in processes can often net large results in preventing pollution and cost reduction.
The following procedures can be used to maximize process efficiency.
• Drag-out reduction.
• Rinse water reduction.
• Conventional maintenance methods.
• Advanced Maintenance technologies.
Drag-Out Reduction
Drag-out of process fluid into rinse water is a major source of pollution in any plating shop. The
volume of drag-out discharged from a process is determined by some factors that cannot be altered easily,
such as part shapes and process fluid concentrations. The effects of many other contributing factors,
however, are readily reduced by common techniques. Reduction of drag-out not only reduces the mass of
pollutants reaching the wastewater stream but also reduces the amount of chemical loss suffered by the
process. Because most drag-out reduction methods require only operator training or small process changes,
the cost savings and other benefits realized quickly offset any implementation expenses incurred. Drag-out
reduction techniques include the following.
• Plating Solution Control - minimizes drag-out by reducing bath viscosity with the lowest
concentration or highest temperature possible, reducing surface tension with wetting agents,
preventing the build-up of contaminants in process tanks by monitoring carbonate accumulation,
and using high purity electrodes to reduce impurities from falling out and contaminating the
solution.
• Withdrawal Rates and Drainage - are critical to minimizing drag-out. Maximizing the drip time,
using drip shields or boards to capture and return drag-out as a rack or barrel is transported away
from the process, using tanks to collect drag-out, and utilizing air knives to enhance drainage will
return the maximum drag-out volume.
• Positioning of Parts on the Rack - is important both for quality as well as drag-out reduction
considerations. The best position is typically determined by experimentation. Parts should not be
racked over one another, but they should be positioned to consolidate runoff streams, and oriented
so that the lowest profile emerges from the fluid as the rack is removed.
• Rinsing Over Process Tanks - with fog or sprayers can be utilized in heated processes, which
provide enough evaporation headroom to accept additional fluid. The process can cause
complications with ventilation systems by possibly increasing the airborne pollutant load.
• Drag-Out Tank - is a rinse tank that is filled with water but is stagnant and drag-out accumulates in
the tank. The contents of the tank are used to replenish drag-out and evaporation losses occurring in
the process tank. Water is added to the drag-out tank to maintain the operating level.
• Drag-In Drag-Out Rinse- is positioned before and after the plating tank to ensure that the drag-out is
returned at the same rate at which it is removed. The procedure is most effective in low-temperature
processes, but requires an extra processing step and builds up contaminants faster than typical
processes.
Benefits of Drag-Out Reduction
• Up to 50% reduction in drag-out loss of chemicals.
• Start-up costs are quickly recovered.
• Lower viscosity reduces the mass of the constituents in the drag-out.
• Higher quality coating can be achieved.
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Limitations of Drag-Out Reduction
• May cause ventilation problems.
• Time loss due to process.
• Increased drying time can accelerate oxidation and passivation.
• Staining can occur if parts dry completely.
Rinse Water Reduction
Water usage cannot be reduced indiscriminately without risking process problems. Rinse tanks must
not exceed maximum concentration of contamination, or part quality will suffer. However, several
inexpensive methods can significantly reduce water consumption without affecting rinse contaminant
concentrations. They are as follows.
• Tank Design - should allow for rinsing of the largest parts, and all tanks (rinse and process) should
be the same size. Inlet and outlet points should be at opposite sides of the tank and the flow into the
tank should be distributed. Agitation may be achieved through air spraying or other methods.
• Flow Controls - will reduce waste by closely monitoring the flow. Timer release controls regulate
flow by opening and closing valves at set times, while conductivity controllers regulate flow based
on rinse water conductivity. When the conductivity reaches a set point, the valve is opened and
water flows through the tank. When the conductivity falls below a set point, the valve is shut-off.
• Rinse Configuration - effects the amount of drag-out that is recovered. A simple overflow rinse is
very inefficient. A drag-out rinse or counterflowing rinse series inserted between the overflow rinse
and the process is much more efficient. A counterflowing rinse series consists of a series of tanks
where fresh water enters the tank farthest from the process tank and overflows into the next tank
closer to the process tank, in the opposite direction of the work flow. As work runs through a
counterflowing series, the first tank becomes more concentrated than the next. The flow rate is
calibrated to achieve the desired concentration in the last, or cleanest tank.
Benefits of Rinse Water Reduction
• Reduced water consumption and corresponding water costs.
• Increased waste treatment efficiency from decreased throughput.
• Size reduction of future waste treatment and pollution control technologies.
• Reduction in use of treatment chemicals.
• Allows for shorter dwell times.
Limitations of Rinse Water Reduction
• Flow controls have to be automated; manual valves are difficult to control.
• Set-up often requires large floor space.
Conventional Maintenance Methods
Maintaining the bath plating solutions can prolong their use. By removing the contaminants in a
bath solution, fewer chemicals enter the waste stream and fewer chemicals are also required. The most
common conventional bath maintenance method is filtration. Nearly all plating baths require filtration to
remove suspended solids that would otherwise adhere to the surface of the parts and cause rough plating.
Small tanks can be filtered efficiently by in-tank designs, while larger tanks require external pump and filter
assemblies. The disposable cartridge filters are typically fabricated wound or woven plastics, or sand and
diatomaceous earth.
Notes
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JT , Plating bath contaminants can also be removed through the following techniques to extend the bath
life.
• "Dummy Platting" - or electrolysis is a method of reducing the mass of contaminant metals in a
plating bath by plating them onto a dummy panel. During dummy plating, a current density much
lower that that used for normal plating is applied.
• Carbonate Freezing - is applicable to sodium-based cyanide plating baths. When cooled to a
temperature of approximately 3°C, sodium carbonate crystals form and can be removed easily.
• Carbon Treatment - is a common method of reducing organic contamination in plating baths.
Carbon treatment may only consist of occasionally substituting carbon for normal cartridges in the
existing filtration equipment.
Advanced Maintenance Technologies
Advanced maintenance technologies are relatively new, but they are employed to treat specifically
difficult to maintain bath solutions. The following four treatments typically utilized are:
• Microfiltration - is a membrane-based technology applied primarily to aqueous and semi-aqueous
cleaning solutions. This technology separates emulsified oils and other colloids from the cleaner
chemistry, thereby extending the life of the process bath.
• Ion Exchange - is applied to chromic acid solutions to remove cations, such as copper, zinc, or iron
that are introduced into plating baths from racks and parts. For chromic acid purification, ion
exchange competes with ion transfer and membrane electrolysis.
• Acid Sorption - is applied to acid solutions, such as pickling or sulfuric acid anodizing baths, to
remove dissolved metals.
• Ion Transfer - is a common technology with applications generally restricted to chromic acid plating
baths, etched, and anodizing baths. The goal of this technology is to selectively remove cations from
chromic acid process fluids.
Benefits of Process Bath Maintenance
• Extends bath solution life.
• Reduces chemical use.
• Reduces waste disposal.
Limitations of Process Bath Maintenance
• Start-up costs can be expensive.
• Expensive start-up and maintenance costs for certain processes.
• Can cause time delays in the plating process.
5.7.3.2 Recycling
Chemical recovery technologies either recover drag-out and return it to the process or recover a
constituent of the drag-out chemistry, usually a dissolved metal, and recycle it in another process.
Recovering drag-out reduces raw material costs by returning otherwise lost components to the process and
reduces the mass of regulated ions reaching the waste treatment system, which lowers costs and aids in
complying with discharge limits. Recycling takes places both on-site and off-site.
On-Site Recycling
On-site recycling technologies typically recover plating solution lost from drag-out in the rinse
tanks; usually a dissolved metal. The following briefly summarizes the types of technology commonly used.
• Evaporation - with atmospheric and vacuum systems are the most common chemical technology
used in the plating industry. Atmospheric evaporators are most common, and relatively inexpensive
to purchase, and easy to operate. Vacuum evaporators are mechanically more sophisticated and
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more energy efficient. Additionally, with vacuum evaporators, water lost as vapor can be recovered
as a condensate and re-used in the plant.
• Ion exchange - is a versatile technology that can be a major component of a low- or zero-discharge
configuration or it can be employed to selectively remove certain cations from a rinse stream. In
either case, ion exchange can only be applied to relatively dilute streams, and is often used to recycle
rinse water.
• Electrowinning - is a well-known and common recovery technology. It is limited, however, because
only the metal portion of the process chemistry is recovered, making direct return of metal-depleted
drag-out usually impossible. The technology is generally inexpensive both to purchase and operate.
Electrowinning is applied to drag-out fluids, process baths, or ion exchange regenerate, all of which
are relatively concentrated with metal ions.
• Electrodialysis - is employed with much less frequency for metal recovery than some other
technologies, such as ion exchange or evaporation. The most common application of electrodialysis
is the recovery of nickel from rinse water. One advantage unique to this technology is that the
organic molecules are prevented from entering the concentrate flow and therefore are not returned to
the process tank, making electrodialysis particularly suitable for recovery of process fluids in which
an undesirable build-up of organics occurs.
• Reverse osmosis - is a membrane filtration technology that has been applied to a single rinse stream
from a process or to a mixed stream from several processes. The portion of the flow that passes
through the membrane is usually recycled as rinse water. The portion of the flow rejected by the
membrane and containing most of the dissolved solids is often suitable for direct return to the
process tank. Reverse osmosis is a good component of low- or zero-discharge configuration.
Benefits ofOn-site Recycling
• Reduces raw material costs.
• Can remove both organic and non-organic materials.
• Reduces mass of regulated ions reaching the waste treatment system.
• Removes liability associated with land disposal from generator.
Limitations ofOn-site Recycling
• Can require expensive engineering and planning stages.
• Equipment must be customized to each system.
• Capitol and operational costs can be high.
Off-Site Recycling
Approximately one-third of U.S. plating shops send their metal bearing wastewater treatment
sludges to off-site metals recycling companies, rather than to land disposal. The recycling companies
separate the metals from the sludges and convert them to usable materials. Off-site metals recycling services
in the United States were previously limited to spent solvents, precious metal wastes, and high purity
common metal wastes. Since 1985, there has been a steady increase in the use of off-site recycling, primarily
because of the availability of recycling services for wastewater treatment sludges, rising costs for land
disposal, and increased generator concern over liability associated with land disposal.
Benefits of Off-site Recycling
• Reduces liability associated with land disposal from generator.
• The amount of waste going to land disposal is reduced.
• Organic and non-organic materials can be removed from baths.
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JT , Limitations of Off-site Recycling
• Slightly more expensive than land disposal.
• Limited to spent solvents, precious metal wastes, and high purity common metal wastes.
5.8 Paint Application
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve paint application operations.
5.8.1 Process Description
Paint application is the process of applying an organic coating to a substrate. The purpose of
applying a paint coating is to provide a protective barrier against corrosion and damage to the part surface, as
well as, enhance the aesthetic appeal of the part being manufactured.
The complete process of applying paint to a part generally consists of (1) cleaning and degreasing,
(2) chemical etching (optional), and then (3) applying the paint. This section deals only with the third step,
application of the paint. Pollution prevention information for reducing the wastes generated from the first
two steps is contained in the following parts of this document: Section 5.5, Cleaning & Degreasing; and
Section 5.6, Chemical Etching.
5.8.2 Waste Description
Wastes generated from paint application may include air emissions of volatile organic compounds
(VOCs), hazardous air pollutants (HAPs), and heavy metal particulates; excess paints and coatings, empty
containers, disposable brushes and rollers, dirty solvents and thinners used for equipment cleanup, dirty filters
from dry filter paint booths, and paint sludge from water wash paint booths. The toxicity and hazard of the
wastes generated is dependent on the concentration of solvent remaining in the waste and the presence of
heavy metals such as lead and chromium compounds used in paint formulations.
The largest source of air emissions is from the actual step of applying the paint in the form of
overspray. The greater the overspray, or lower transfer efficiency, the more waste is generated over-all in the
form of air-emissions, clean-up materials, and paint booth filters or sludge.
5.8.3 Pollution Prevention Opportunities
Pollution prevention opportunities for paint application processes are classified according to the
waste management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-
process) recycling options.
5.8.3.1 Source Reduction
The preferred method of pollution prevention is source reduction. In the case of paint application
processes the keys to source reduction are:
• Eliminating the need to paint the part through product re -engineering;
• Using environmentally friendly coating material; and
• Improving transfer efficiency through improved equipment and operator training.
Each of the three source reduction methods is described below with associated benefits and
limitations. The information contained below is not to be considered completely inclusive of all
environmentally preferred paint application methods or formulations, nor is its intent to be exhaustive of all
considerations. Prior to implementing an environmentally preferred paint application method or formulation
a thorough investigation of process requirements (material compatibility) and an appropriate financial review
(i.e., payback period, etc.) should be conducted.
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Eliminate the Need to Paint
Eliminating the need to paint a part due to better process engineering and design would be the
highest form of source reduction. Although one should be cautious that the environmental impacts associated
with the alternative design are not worse over-all.
The need for painting can sometimes be avoided by selecting materials that combine both function
and aesthetics. Use of injection-molded plastic shells in place of painted metal cabinets is widely practiced in
the electronics industry. Building construction employing the use of vinyl siding, PVC and FRP plastics,
precolored concrete, and metal trim materials such as stainless steel, copper, bronze, and aluminum are
known.
The area of surface-coating-free materials is not as widely explored nor marketed as non-, low-VOC
coatings as a means to reduce the environmental impacts from painting operations. In addition, to implement
this form of pollution prevention requires forethought during the design of the product, and typically is cost
prohibited to implement after the product design stage.
Benefits of Eliminating the Need to Paint
• Eliminates the need to apply paint, in turn, eliminating all environmental impacts associated with
paint application and paint removal over the life span of the product.
Limitations of Eliminating the Need to Paint
• Generally, can only be implemented during product design.
Use Environmentally Friendly Coating Material
Traditional solvent-based coatings contain high levels of volatile organic compounds (VOCs) that
are emitted into the air during paint operations. VOCs contribute to ground level smog formation and other
forms of air pollution. Under the Clean Air Act, limitations have been set as to the amount of VOCs that are
allowed in paints and coatings. While limits are based on specific industry group and application, the VOC
limit of 3.5 Ibs/gal is considered reasonably available control technology (RACT) in most states. Coatings
with VOC contents of less than 3.5 Ibs/gal are generally marketed as low-VOC coatings.
Low-VOC or environmentally friendly paint coatings are currently available in a wide variety of
formulations. The following list identifies the most common types of formulations available.
• Powder Coatings
• Water-Borne Coatings
• Solvent-Borne Coatings
• Specialized Coatings
Each formulation has its own unique performance qualities and application requirements. Prior to
performing a material substitution it is necessary to match the appropriate environmentally substitute to your
operational needs. A basic overview of each type of formulation and its associated benefits and limitations
are provided below to facilitate in the material substitution selection process.
Powder Coatings
Powder coatings are particularly popular for their low VOC content. For many applications, powder
coatings offer cost advantages over either solvent- or water-borne liquid technologies. The act of applying
powder coatings does not contribute to air, water, or hazardous waste pollution.
A powder coating facility does, however, generate some pollution, primarily from two associated
processes. The first and most important involves surface preparation. Powders are applied over well-
degreased surfaces, which have been phosphated. The second important pollution-generating process is the
stripping of powder coating from hooks and rejected parts.
The two basic steps in the powder coating process are described on the next page.
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• Applying the Coating - can be done through three primary methods including electrostatic attraction
by corona charge, elecrostatic attraction using turbo-charging guns, and fluidized beds. None of the
coating methods involve solvents or generate hazardous wastes. Also clean-up efforts are minimal,
benefiting both pollution prevention and time and materials resources.
• Curing the Coated Part - entails heating the powder-coated part in a convection or infrared oven at
temperatures between 325 °F and 400 °F for approximately 8 to 20 minutes. When the powder
coating is cured, some vapors, approximately 0.5 to 5 percent by weight of powder coating, are
emitted into the atmosphere. These are comprised mainly of water and some organics. The organics
are not solvents, but rather plasticizers or resins emitted at the high baking temperature. It is
questionable whether the air emissions are truly VOCs. In fact, most air pollution regulatory
agencies assume that the emissions from powder coating operations are essentially zero; therefore,
operators are usually not required to measure or record their emissions. Facility personnel should
consult the regulations for their area for applicable regulations
Benefits of Powder Coatings
• The act of applying powder coatings does not contribute to air, water, or hazardous waste pollution.
• VOC emissions are essential zero.
• Clean-up efforts are minimal, benefiting both pollution prevention and time and materials resources.
Limitations of Powder Coatings
• The substrate has to be completely clean before powder coating, therefore introducing the wastes
associated with degreasing, cleaning, and etching.
• The stripping of powder coating from hooks and rejected parts produces pollution.
• The curing process emits vapors, at 0.5 to 5.0 percent by weight, of the powder coating.
Water-Borne Coatings
The term "water-borne" describes coatings in which the predominant solvent is water. Organic
solvents (VOCs) are also used but, for the most part, their concentration is small. In many formulations the
ratio between the amount of water and organic solvent is 80:20.
The organic solvents, often referred to as co-solvents, enhance the formulation of the coating film,
especially during the drying process when the water is evaporating from the deposited coating. As resin
manufacturers develop new resin technologies, they are reducing the amount of co-solvent required to form
the film. Currently, new formulations exist that contain no co-solvents, and consequently have zero VOCs.
Manufacturers do not yet have a long-term performance history; therefore, most end-users generally consider
the more conventional water-borne coatings.
When dealing with water-borne coatings, the end-users must thoroughly understand the terminology
most regulations use. For instance, 1.0 gallon of a water-borne coating contains many ingredients: the resin
(or binder), pigments, extender pigments, coalescing agents, a small quantity of co-solvents, and usually a
fairly substantial amount of water. The volatile portion of the coating comprises the co-solvents and water.
In a gallon can, the co-solvents, which are considered to be the VOCs, may account for less than 1.0 pound.
In other words, the VOC content of the coating may only be 1.0 pound/gallon. The VOC regulations,
however, require that the VOC content of the coating be calculated as if no water were in the coating.
Depending on the coating formulation, the VOC content, less water, may be considerably higher, such as 2.0
pounds/gallon or more.
The classification of water-borne coatings is further sub-divided into the following categories.
• Water-Borne Air/Force Dry Alkyds, Acrylics, Acrylic-Epoxy Hybrids - are the most common type of
water-borne coatings for metals, which air- or force-dry at temperatures below 194°F. Water-
reducible, or water thinnable, alkyds and modified alkyds are modified polyesters that have high acid
values and employ special chemical blocking agents such as carboxylic acid functionalities.
Although alkyds and modified alkyds may take longer to dry, the resulting coatings have gloss, flow,
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and leveling properties similar to their solvent-borne counterparts. The acrylic latexes include other
polymers such as vinyl acrylic and styrene acrylic. The resins are high molecular weight polymers
dispersed as discrete particles in water. Acrylic latexes are known for their good exterior durability
and excellent resistance to ultraviolet (UV) degradation. In outdoor exposure, they retain their
original gloss and color over long periods. Acrylic epoxy hybrids, another type of water-borne
air/force dry alkyd, comprise two-or three-package systems in which emulsified epoxies cross-link
with aqueous acrylics. Most acrylic epoxy hybrid formulations are corrosion resistant and can
produce finishes that have very good gloss, hardness, flexibility, alkali, and abrasion resistance.
Unlike conventional solvent-based epoxies, some mixed water-borne coatings have pot-lives of up to
36 hours at reasonable ambient temperatures.
Water-Borne Epoxy Water Reducible Air/Force Dried Coatings - can be cured at room temperature,
or below 194 °F. Manufacturers supply these coatings as two- or three- package systems. The most
commonly available water-reducible epoxies are formulated as primers complying with military
specifications MIL-P-53030 (lead- and chromate-free) and MIL-P-85582 (containing chromates).
As primers, they are commonly specified for steel weldments, such as automotive chassis, cabs,
truck bodies, military hardware, steel and aluminum frames, cold rolled steel panels and cabinets,
aerospace components, and electronic components.
Polyurethane Dispersions - are water-borne systems that can air/force dry at temperatures below
194°F. Essentially, they are polyurethane lacquers dispersed in water; therefore, as the water
evaporates, the coating film forms. No other curing mechanisms take place. Polyurethane
dispersions can be useful on metal parts, much like the conventional two-component polyurethanes,
the primary focus at the present time is in the wood finishing industry.
Water-Borne Baking Finishes: Alkyd, Alkyd-Modified, Acrylic Polyester — cure at elevated
temperatures, usually well above 250 °F. Cross-linking occurs by formulating the basic resin with
aminoplast resins such as melamine formaldehyde. Because of the high temperature-curing
requirement, these coatings are generally not appropriate for heat-sensitive substrates, such as
plastics. Formulations are available that satisfy 3.0 Ib./gal (360 g/L), less water, with some below
the 2.3 Ib./gal (275 g/L) levels. The VOCs including water are in the 1.5 to 2.0 Ib./gal (180 to 240
g/L) range. Compared with their air-forced dried counterparts, they have higher VOCs on both a
"less water" and "including water" basis. These products exhibit properties such as hardness, mar
and abrasion resistance, and excellent color and gloss retention, even when exposed to sunlight,
chemicals, detergents, and solvents.
Benefits of Water-Borne Coatings
Low VOC, RACT compliant, coating.
Can be spray applied with standard equipment.
Low fire hazard due to high water content.
Generally, have a low toxicity due to reduced concentrations of organic solvents.
Can clean spray equipment and ancillary equipment with tap water.
Suitable for coating steel, aluminum, galvanizing, plastic, wood, and architectural substrates.
Available in a wide range of colors and gloss levels.
Limitations of Water-Borne Coatings
Compared with 2-part polyurethanes or baking water-reducibles, they have poorer exterior durability
and poorer resistance to salt spray, humidity, chemicals, and solvents.
Although the lower concentrations of solvents in their formulations benefit pollution prevention, this
also causes water-borne coatings to be more sensitive to substrate cleanliness than most solvent-
borne coatings.
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• Some water-borne epoxy water-reducible air/force dried coatings contain chromates, and therefore
require disposal as hazardous waste.
Solvent-Borne Coatings
Although air pollution agencies actively promote water-borne coatings, all solvent-borne coating
cannot yet be replaced. Some companies will require solvent-borne coatings into the 21st century.
Fortunately, VOC contents are gradually decreasing, viscosities are becoming manageable, and paint
chemists continue work on developing new solvents that are not VOCs, hazardous air pollutants (HAPs), or
ozone depleting compounds (ODCs). These new solvents may offer a wide range of new opportunities.
The classification of solvent-borne coatings is further sub-divided into the following categories.
• Solvent-Borne Alkyds and Modified Alkyds That Air or Force Dry - are basically oil-modified
polyesters that form from a reaction between an alcohol and an organic acid. Each combination has
its own distinctive chemical and physical properties. In addition, properties of alkyds such as
hardness, gloss retention, color retention, sunlight resistance, etc.; can be improved by modifying
alkyds with other resins. Typical modifications add styrene, vinyl toluene, acrylics, silicone, or
other polymers. Any of these modified products are more commonly known as modified alkyds.
• Alkyd Derivative Combinations That Cure By Baking- include high sold alkyds, acrylics, polyesters
oil-free, melamine- and urea-formaldehyde, and phenolics. Unlike the air/force dry alkyds, this
group of coatings provides excellent physical and chemical properties. The primary difference is
that cross-linking of the resins takes place when the coating reaches a certain minimum temperature.
For most such coatings, curing takes place at temperatures above 250 °F, but the curing time may be
too long (over 30 minutes) for most production painting facilities. These coatings have properties
similar to water-borne alkyd-type baked coatings. As with the water-borne coatings, these solvent-
borne counterparts are commonly applied to steel shelving, steel racks used in stored and
warehouses, metal office furniture and equipment, and large appliances (e.g., dishwashers,
refrigerators, etc.).
• Catalyzed Epoxy Coatings - constitute the counterparts to the water-borne epoxy coating that can
achieve heavier film builds for many applications. Most commonly, these coatings are air- or force-
dried, two -component materials compromising two separate packages. Component A being the
epoxy resin and component B being a polyamine, or some other resin. Catalyzed epoxies are
beneficial when requiring resistance to many chemicals, solvents, and alkalies, such as soaps and
detergents. In addition, these coatings have excellent resistance to fresh water, salt water, and hot
water. For these reasons they are a popular choice for protecting structures such as offshore drilling
platforms, ships, and bridges, where resistance to marine environments is critical. Facilities also use
them to coat industrial and potable water tanks and pipelines. Compliant epoxies are available that
meet military specifications such as MIL-P-23377 (primer), ML-P-53022 (primer), MTL-C-22750
(topcoat), and MIL-P-2444 1 (primer and topcoat systems).
• Catalyzed Two-Component Polyurethanes - are formed by the reactions of a polyisocyanate with a
polymer that contains hydroxyl functionality. Two -component polyurethanes are supplied in two
separate containers, of which the first is component A and the second is component B. Component
A can either be clear or pigmented and offers a wide range of colors and gloss levels. The second
container, component B, is the curing agent. When end-users mix components A and B according to
the manufactures' prescribed ratios, the polymers react to form a highly cross-linked polyurethane.
Facilities select polyurethanes for applications requiring a superior finish including aircraft skins,
missiles, machine tools, tractors, etc.
• Moisture Curing Polyurethanes - have an interesting mechanism. When a polyhydroxy resin pre-
reacts with a polyisocyante, but not completely, some unreacted isocyanate groups remain. The
coating then cures in the presence of moisture from the air. Although many would prefer these
single -component polyurethanes to two -component products, few companies currently sell moisture -
curing polyurethanes because they are difficult to manufacture. The complicating issue is that
moisture must be eliminated from all ingredients.
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Benefits of Solvent-Borne Coatings
• Through research, VOC contents are gradually decreasing.
• New products have more manageable viscosities.
• High solid coatings can perform well below RACT levels.
• Solvent-borne coatings are the least expensive of the RACT compliant systems.
• Coatings are available in a wide range of colors and gloss levels.
• Coatings often exhibit excellent performance properties such as good chemical and solvent
resistance, hardness, mar resistance, gloss, and ultraviolet resistance.
• Good adhesion is offered on a number of different substrates including most metals, plastics, wood,
ceramics, masonry, glass, etc.
Limitations of Solvent Borne Coatings
• Solvent-borne coating often barely meet the RACT limits.
• Solvents contain VOCs, hazardous air pollutants (HAPs), and ozone depleting compounds (ODCs).
• Typically have higher VOCs than alternative methods.
• Solvents pose a fire risk.
• There are potential health risks inherent to working with solvents.
• The high viscosity of the coating can affect product quality.
• Most solvent-borne coatings can not meet the strict Californian RACT limits.
• Epoxy coatings have relatively poor resistance to ultraviolet light, and improper application can
cause severe health problems in operators.
• Few companies currently sell moisture-curing polyurethanes because they are difficult to
manufacture.
Specialized Coatings
Specialized coatings have a narrow window of application. For some end-users, one of these
technologies will be the ideal choice. However, they are unlikely to make a significant penetration into the
total coatings market.
The range of specialized coatings is explained below.
• Autodeposition - is cost-effective for large coating users, whose annual throughput of metal is at
least 1,000,000 square feet, but is generally not a viable option for small or medium-sized coating
user. During the autodeposition process, a resin in the form of latex is electrochemically deposited
on steel surfaces. The process is currently limited to steel, but the steel does not require pretreatment
with a phosphate coating. While the process can eliminate phosphating, it still requires superior
cleaning that may comprise several stages including (1) a 1 minute alkaline spray clean, (2) a 2
minute alkaline immersion, (3) a spray or dip plant water rinse, and (4) a 5 to 10 second deionized
water spray rinse. The end products consist of a pigmented water-dispersible (latex) resin,
hydrofluoric acid, hydrogen peroxide, and deionized water. No solvents are used in the coating
process.
• Electrodeposition - is predominantly utilized by large coating users whose annual throughput of
metal is at least 2,000,000 square feet. This process deposits the coating electrochemically onto the
metal surface with the aid of a DC current. Prior to coating, the metal parts pass through a
multistage cleaning and treating process. Thorough cleaning precedes a phosphate process, which
might include chromate or chromic acid seal rinse and at least one deionized water rinse.
Electrodeposited coating have approximately the same VOC content as conventional baking water-
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JT , borne coatings. Hazardous waste disposal and the discharge of contaminated water, however, are
considerably less.
• Radiation Cured Coatings - cure when they are exposed to specific wavelengths of ultraviolet (UV)
or electron beam (EB) radiation. VOC emissions are very low, even approaching zero for some
formulations because curing takes place without the need for solvents to evaporate. While EB
coatings receive energy from an electric heated filament or cathode, low-pressure mercury arc lamps
generate the energy to cure the UV curable coatings. In order to ensure a consistent film cure, the
mercury arc lamps must be positioned within a few inched of the coated substrate. This is why the
substrate must have a very simple geometry, such as a flat or uniformly round shape. Adding
colored pigments to the formulation retards curing and extends curing times; therefore, most of the
coatings being used are clear.
• Unicarb System - is designed to use liquid carbon dioxide (CC>2) as a solvent for coatings. Because
of the excellent solubility characteristics of CC>2 (non VOC), additional solvents can be added to the
conventional or high solids coating resins. The Unicarb System is a two component delivery system,
where the coating resin and CC>2 are feed to and mixed at the spray gun. The coating viscosity drops
to a manageable level and excellent atomization takes place.
Benefits of Specialized Coatings
• Radiation cured coatings and autodeposited coatings can have VOC contents that approach zero.
• Autodeposition and electrodeposition generate minimal water pollution.
• Autodeposition and electrodeposition pose little or no fire hazard.
• Autodeposition coatings are non-toxic.
• Autodeposition and electrodeposition have high transfer efficiencies, therefore minimizing waste.
• Electrodeposition can be applied to steel, galvanized steel, and aluminum, to provide a hard, flexible,
corrosion resistant coating.
• Vapors for radiation-cured coatings are easily exhausted with no measurable air quality damage.
• Extremely short curing times are possible with radiation curing.
• The Unicarb System can reportedly reduce VOC emissions by as much as 50 to 80 percent, and
increase transfer efficiency by up to 30 percent.
Limitations of Specialized Coatings
• Specialized coatings are not applicable in most situations.
• Autodeposition and electrodeposition are only cost-effective for large production shops with high
throughput.
• Autodeposition is only applicable for steel substrates.
• Radiation cured coatings are limited to substrates with simple geometries, such as flat or uniformly
round shapes.
• Health concerns have been raised in the radiation curing industry over operator exposure to
hazardous vapors.
• The capital expense associated with switching from a conventional system to Unicarb is relatively
high.
Improve Transfer Efficiency
Transfer efficiency is defined as the ratio of the mass (or volume) of solid coating deposited on a
substrate to the mass (or volume) of solid used during the application. Improving the transfer efficiency of
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the equipment used to apply the paint directly reduces the amount of waste and air emission generated from
the application through source reduction.
The most important equipment to affect transfer efficiency, and thus pollution prevention, in a paint
and coating facility is the spray gun. The conventional air atomizing spray gun described in the process
description section is considered to have a low transfer efficiency, therefore, creating excessive air emissions
and clean-up wastes than necessary to apply paint to a typical part. Currently, there are four basic types of
high transfer paint application (spray guns) technology available on the market. They are:
• High volume low pressure (HVLP) spray guns,
• Airless spray guns,
• Air-assisted airless spray guns, and
• Electrostatic spray guns.
Each improved type of spray guns is further described below with associated benefits and
limitations.
High Volume Low Pressure (HVLP) Spray Guns
The high volume, low pressure (HVLP) spray gun was introduced to the United States market in the
mid-1980s. It is very similar to the conventional air atomizing gun. While the conventional gun atomizes the
coating at pressures of 40 to 80 psi, HVLP guns use higher volumes of air at pressures less than 10 psi to
perform the same function.
Several methods are available for generating the high volume, low pressure air. During the mid-
1980s the most common method was using a high speed turbine that draws large volumes of air directly from
the surrounding space. The turbine pushes this high volume of air through a large diameter hose to the spray
gun, but the air pressure can range from as low as 0.5 to 10 psi. The key to atomizing the coating with this
method is the high volume of air that mixes with the coating inside the gun. In addition, the turbine tends to
heat the air to a temperature of approximately 110 °F, which appears to benefit the application of the coating.
More recently, spray gun vendors have introduced versions that do not require a turbine to generate
the high volume air. Instead, they directly convert high pressure shop air to high volume, low pressure by
means of venturies or regulators. Typically, the incoming shop air is at 80 to 100 psi, while the air emerging
from the cap of the spray gun is less than 10 psi. The volume of air for this gun is considerably less than that
emerging from the turbine gun.
Generally, HVLP guns have been successful in atomizing a wide range of coatings, although some
rheologies (viscosity additives) do not atomize well. Although the turbine-operated HVLP guns are more
expensive than the pressure-conversion HVLP guns, the turbine types are generally more efficient at
atomizing a wider range of coatings; therefore, in some cases, they are the most cost-effective option.
Transfer efficiency trials have demonstrated that the HVLP guns are generally more efficient than
other gun types, and in some instances even more efficient than electrostatic spray guns. Each operating
scenario determines how efficient one gun type will be relative to the other types. One should not be misled
by advertisements which claim that HVLP guns are always more efficient than other gun types. Only on-line
testing can provide the answer.
Benefits of HVLP Spray Guns
• Higher transfer efficiency than traditional conventional air atomizing spray guns, which directly
translates to reduced air emissions and waste generation.
• Can immediately replace conventional air atomizing spray guns without requiring any other major
capital purchases.
• Operators can use the guns to apply coatings to small, medium, and large targets.
Notes
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N Limitations of HVLP Spray Guns
• HVLP spray guns require greater operator skill, therefore, additional training will be required.
• An optional heater may be required to properly heat the incoming air to atomize the paint (dependant
on climate and specific gun design).
Airless Spray Guns
The airless spray system works much like a home water system. When turning on the faucet at
home to take a shower, high pressure from the city's pumping station forces water through small orifices in
the showerhead. Depending on the size of the orifices, the spray is either fine or coarse.
With an airless spray system, a hydraulic pump siphons the coating out of a reservoir such as a 55-
gallon drum, and then pumps the coating, usually under pressures of 1,000 to 3,000 psi, to the spray gun. The
coating atomizes as it passes through the small orifice (0.011 to 0.074 inches) in the cap of the gun. The size
and shape of the orifice determine the degree of atomization and the shape and width of the fan pattern.
Moreover, a large orifice permits a higher fluid flow rate than a small orifice.
Unlike the conventional air atomizing spray gun, the airless spray gun does not permit the operator
the same flexibility in setting spraying parameters. Further, because of the high fluid pressure, operators can
apply large quantities of the coating relatively quickly. For this reason, operators often use the airless spray
gun to apply coatings to large surfaces such as buildings, the sides of vessels in petroleum refineries,
structures such as bridges, etc. In addition, operators often use this gun in coating facilities where the coating
application must keep up with fast moving conveyors.
EPA has traditionally associated this gun with transfer efficiency values of approximately 40 percent
but considerably higher values are obtainable. For instance, airless spray guns that coat large surfaces, such
as large electrical control panels, railcars, ships, buildings, etc., are usually associated with much higher
transfer efficiency values. Alternately, operators usually do not use this gun to coat small targets because the
high fluid pressure tends to deflect small targets suspended on conveyor lines, and the generally high fluid
delivery rates make it difficult to achieve acceptable-looking finishes. When using an airless spray gun to
coat small targets, therefore, the operator can expect low transfer efficiencies, sometimes even lower than
those which a conventional spray gun could achieve.
Benefits of Airless Spray Guns
• Reduces air emissions and waste generation from overspray.
• Effective in coating large surface areas quickly.
• Transfer efficiencies of 40 percent and greater can be obtained.
Limitations of Airless Spray Guns
• Provides less operator flexibility in setting spraying parameters.
• Difficult to obtain a high quality finish on small parts due to the high fluid pressure.
Air-Assisted Airless Spray Guns
The principle of this spray gun is very similar to that of the airless gun in that high fluid pressures
force the coating through a small orifice in the spray gun cap.
The gun differs from the airless spray gun in that the fluid pressures are only 300 to 1,000 psi. These
pressures, however, poorly atomize the top and bottom of the fan. Moreover, streaks or "tails" appear at the
-pressure air emerges from separate orifices in the horns of the cap
to force the "tails" back into the main portion of the pattern. The low-pressure air, 10 to 20 psi, does not
atomize the coating particles, and therefore the gun differs considerably from the conventional air atomizing
spray gun. The air-assisted airless gun is currently among the most popular types used in a wide range of
industries. While it can handle relatively high fluid flow rates and therefore keep up with fast moving
conveyor lines, it can also be adjusted for slow moving lines. Operators commonly use this gun to coat
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medium- and large-size targets, and in some cases to coat small parts, providing surprisingly appealing
finishes.
EPA transfer efficiency table values which appear in various EPA documents, such as Control
Technique Guidelines, New Source Performance Standards (NSPS), National Emission Standards for
Hazardous Air Pollutants, are approximately 40 percent for the air-assisted airless spray gun.
Benefits of Air-Assisted Airless Spray Guns
• Reduces air emissions and waste generation from overspray.
• Effective in coating large surface areas quickly.
• Can be adjusted to coat small and medium sized parts with a quality finish.
• Transfer efficiencies of 40 percent and greater can be obtained.
Limitations of Air-Assisted Airless Spray Guns
• Poorly atomizes the top and bottom of the fan.
Electrostatic Spray Guns
This category of spray guns embraces a wide range of technologies; electrostatic guns can use
conventional air, airless, air-assisted airless, and HVLP atomizing technologies. The paint operator has a
wide range of spray gun designs from which to choose.
All of the electrostatic technologies have one thing in common: the gun imparts an electrostatic
charge to the coating particles as they emerge from the spray gun nozzle. The operator must be sure to
ground the target well so that the charged coating particles will be attracted to the grounded part and deposit
themselves on the substrate.
Operators and others commonly believe that when applying a coating electrostatically, the coating
wraps around the target to coat not only the facing surface, but also the reverse side of the target.
Advertisements and vendors' literature reinforce this point. Unfortunately, this is a misconception. Some
wrap of course takes place; the extent of the wrap, however, is often overstated. If coating round or square
tubing electrostatically, the operator can expect almost total wrap around the entire tube because of the
relatively small area that the coating must wrap. Alternately, when coating a medium or large flat target, the
wrap only extends for approximately 1/8 to 1/4 inches around the reverse side. The wrap rapidly diminishes
toward the center of the reverse surface.
Many parameters determine the efficiency with which the coating can wrap around the surface.
These include:
• Polarity of the coating;
• Voltage potential of the spray gun;
• Air velocity in the spray booth; and
• Efficiency of the ground.
The operator cannot assume that the target is always well grounded even if it is attached to a ground
strap or suspended from a conveyor hook. In fact, significant electrical resistance can exist between the target
and the ground. Poor wrap leads to lower transfer efficiency. The mere fact that the spray pattern tends to
bend toward the target when the paint particles follow the electrostatic field is already advantageous.
Benefits of Electrostatic Spray Guns
• Reduces air emissions and waste generation from overspray.
• Transfer efficiencies of 65 percent and higher are obtainable.
• Effective in coating edges.
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N Limitations of Electrostatic Spray Guns
• An electric hazard is introduced into the paint application process.
• Poor grounding can result in lower transfer efficiency rates.
• Application specifications and operating procedures are more stringent than other spray gun
application technology.
• Extensive operator training is required.
Improved Spray Application Techniques
In addition to purchasing new spray application equipment, improving your facilities current spray
techniques will also reduce waste volumes with little to no capital expense. The following list provides some
suggested improved application techniques.
• Move Closer to the Part - A typical gun to target distance should be 8 to 12 inches. In general, as
the distance increases, transfer efficiency diminishes.
• Reduce The Fluid Flow Rate - If the fluid pressure and corresponding fluid flow rate are high, the
stream of paint emerging from the spray gun travels a relatively long distance before bending and
falling to the ground. Such a flow rate has a very short residence time within the spray gun and
requires a large amount of energy for proper atomization.
• Optimize The Fan Width - Properly adjust the fan width of the spray gun to match the size of the
part; especially, when changing part size and geometry frequently to reduce overspray.
• Optimize The Painting Pattern (Gun-Stroke) - Reduce the size of the leading and trailing edges of
the spray stroke while eliminating overlap in painting strokes.
Benefits of Improved Spray Application Techniques
• Reduced air emissions.
• Reduced wastes from clean-up operations.
• Lower raw material costs.
• Increased air filter life span.
Limitations of Improved Spray Application Techniques
There are no limitations associated with improving spray application techniques.
5.8.3.2 Recycling
There are no recycling options available for the paint application process due to the nature of the
process.
5.9 Paint Removal
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve paint removal operations.
5.9.1 Process Description
Paint stripping is a process stage common to paints and coatings operations. Although efficiently
run operations attempt to minimize the need for paint stripping, the need can still arise for work pieces either
because the applied coating is defective, the job specifications have changed, or the original coating has aged.
Occasionally, process equipment (e.g., racks, vessels, booths, and grates) als o must undergo paint stripping to
remove the buildup of overspray.
The conventional approach to paint stripping involves the application of a chemical solvent.
Traditional formulations are based on methylene chloride, which penetrates the coating causing it to swell and
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separate from the substrate. This approach, however, generates organic vapors, which raise concerns about
threats to worker health and about damage to the ozone layer of the atmosphere, as well as considerable
sludge and wastewater laden with solvent.
Common methods for applying chemical paint strippers include immersion in dip tanks and spray,
brush, or roller application. Other conventional paint stripping methods consist of propelling a dry media
(sand, aluminum oxide) at the surface to remove the coating though impaction or abrasion. Although dry
media, such as sand, is considered environmentally better than traditional chemical solvents, such as
methylene chloride, a large solid waste stream is generated because the recyclability rate of the media is
generally low, or none at all. In addition, airborne particulates are created from the blasting process that may
or may not contain heavy metals (dependent on the media and type of coating being removed) which also
raises worker health concerns.
5.9.2 Waste Description
The types of wastes generated from paint stripping depend on the method of removal being
employed. Chemical paint strippers typically generate air emissions (VOCs or HAPs), spent stripping baths,
sludge (containing both solvent and removed paint), and contaminated rinsewaters. While, dry media paint
strippers typically only generate spent abrasives commingled with the removed coating and air emissions in
the form of dust particulates). With dry media stripping techniques, the major concern is dust emissions and
potential lead and chromium compounds in the stripped paint. The major concern with chemical stripping
techniques is the methylene chloride and phenolic compounds used in cold strippers and the difficulty in
handling and treating contaminated rinsewater.
In general, most paint stripping operations are proceeded by, and followed by a cleaning and
degreasing stage to increase the efficiency of the paint stripper and prep the part for the next manufacturing or
rework stage. Pre- and post-cleaning processes are covered in Section 5.5, Cleaning & Degreasing, and
therefore are not discussed in this section.
5.9.3 Pollution Prevention Opportunities
Pollution prevention opportunities for paint removal operations are classified according to the waste
management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-process)
recycling options.
5.9.3.1 Source Reduction
The preferred method of pollution prevention is source reduction. In the case of paint removal
operations the key to source reduction is; (1) eliminating the use of chemical paint strippers that contain
hazardous substances, and (2) improving process efficiency through increased stripping rates with less media
uses per square foot of surface area.
Over the past several years, industry and government have developed several alternative paint
removal techniques in an effort to improve worker health and safely, eliminate the use of phenolic methylene
chloride based chemical strippers, and reduce the environmental impacts associated with the operation. The
advancements in paint removal techniques are grouped into the following five categories;
• "Environmentally friendly" chemical depainting (solvent and aqueous based),
• Dry media blasting,
• Wet media blasting,
• Thermal stripping, and
• Cryogenic stripping.
Each of the five paint removal technology areas are described below with associated benefits and
limitations. The information contained below is not to be considered completely inclusive of all
environmentally preferred paint removal methods, nor is its intent to be exhaustive of all considerations.
Prior to implementing an environmentally friendly paint removal technology a thorough investigation of
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JT , process requirements (material compatibility) and an appropriate financial review (i.e., payback period, etc.)
should be conducted.
"Environmentally Friendly" Chemical Depainting
Environmentally friendly chemical paint strippers are classified as solvent based and aqueous based.
Both forms differ in chemical composition and offer different benefits and limitations for selected
applications.
Solvent Based
Solvent-based paint stripping is conducted by immersing or spraying the work pieces with an
organic solvent-based formulation. The solvent penetrates the coating and undermines its bond with the
substrate, as indicated by wrinkling, bubbling, and blistering on the surface of the piece. The softened
coating and solvent sludge are then wiped, scraped, or flushed away from the substrate. Often a work piece
must undergo this process step several times before the coating is completely removed. After coating
removal, the piece usually undergoes a water rinse.
In general, solvent is only sprayed on work pieces if they are too large for immersion or if they are
assemblies with sophisticated components that could be damaged by extensive contact with the solvent. If
only very specific areas of an assembly need to be reworked, then the solvent may be wiped or brushed onto
the appropriate surfaces. Additionally, if only a small number of pieces need to be reworked, spraying might
present a more cost-effective approach than installing an immersion stripping line.
Environmentally friendly nonchlorinated paint stripping products are based on such diverse
chemicals as N-methyl pyrollidone, various glycol or glycol esters, and dimethyl sulfoxide. These are used in
both immersion and spray-on application paint stripping operations. Although these solvents reduce concerns
about hazardous air pollutants and minimize the generation of sludge with toxic constituents, nonhalogenated
products tend to be considerably more expensive than traditional methylene chloride formulations.
Additionally, immersion baths of nonhalogenated solvents must be heated (from 140° to 250°F) to speed up
their performance capabilities, which adds to operational costs. Even when heated, however, nonhalogenated
solvents have a somewhat selective chemical action and thus tend to be used in a narrower range of
applications than methylene chloride solvents.
Additionally, solvent-based paint stripping methods generate sludge and wastewater that contain
toxic chemicals. Disposal procedures required under the Resource Conservation and Recovery Act (RCRA)
and record keeping requirements under Section 313 of Title III can increase the cost of managing such
wastes. Three commercially available solutions can reduce the amount of hazardous waste sludge generated
while increasing the amount of methylene chloride reclaimed from the decanting process. These are sludge
dewatering presses, solvent distillation units, and/or dip tank filters. The following is a brief explanation of
each type of alternative technology.
• Sludge Dewatering Press. This process involves putting the sludge in a belt or filter press and using
the press filters to separate the paint chips, metal filings, etc. from the paint stripper. Removing
excess paint stripper from the sludge reduces the over all volume of sludge and increases the amount
of paint stripper which can be recycled.
• Solvent Distillation Unit. This process is aimed at recycling the paint stripper as an alternative to
disposal when the immersion bath must be replaced in its entirety. Current practices are to dispose
of the spent solution as hazardous waste. Distillation technology has been in use for many years in
the solvent recovery industry. Industry experts estimate that only 60 to 80 percent of the original
solution can generally be reclaimed. Following distillation of the alternative paint stripper additional
additives may be needed to return the solution to its original performance specifications.
• Dip Tank Filters. This process would enable the user to continuously remove the sludge from the
tank by feeding the used paint stripper through an in-line filter to separate the paint stripper from the
paint stripping wastes.
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Benefits of Solvent Based Paint Removers
• Minimizes hazardous waste disposal.
• Reduces HAP emissions from immersion tank paint stripping operations.
• Eliminates exposure to solvents.
• Meets environmental regulations regarding the use of ozone depleting substances (ODSs).
Limitations of Solvent Based Paint Removers
• Slower paint removal rates than methylene chloride.
• Increased cost for nonhalogenated solvents per gallon.
• Reduced lifespan of solvent.
Aqueous Based
Parts can be stripped of paint using aqueous based chemicals at elevated temperatures. These
chemicals are biodegradable and can be discharged into the sewer system, virtually eliminating hazardous
waste disposal costs. However, certain hazardous constituents in the paint may contaminate the solution.
Local discharge regulations will need to be evaluated prior to discharging or disposing the contaminated
solutions.
Unlike the traditional practices of using a cold tank in conjunction with chlorinated solvents, no
chlorinated solvent waste streams are generated with a heated tank using aqueous/biodegradable cleaners.
Effluent streams associated with the use of heated immersion tank aqueous strippers would be the aqueous
solution and sludge products composed of paint, grease, oil, and dirt. The parts requiring stripping are
immersed into the solution and then agitated to speed up the stripping process. In conjunction with optional
equipment such as filtration systems and skimmers, the chemical solution may be recycled and used again.
Most of the aqueous strippers are alkaline in nature. These are different from acid strippers in that
acid strippers may attack the metal parts, causing structural weakening (hydrogen embrittlement). In addition,
acid strippers normally require a neutralization process after stripping.
Benefits of Aqueous Based Paint Removers
• Minimizes hazardous waste disposal.
• Eliminates exposure to hazardous solvents.
• Meets environmental regulations regarding the use of ozone depleting substances (ODSs).
• Spent wash solutions may be discharged into sewer systems if they meet the local discharge limits.
Limitations of Aqueous Based Paint Removers
• Not compatible with all metals.
• May require additional ventilation.
• May increase paint stripping time.
Dry Media Blasting
Dry media blasting options that have proven reductions in environmental impacts and economic
feasibility are:
• Plastic media blasting,
• Wheat starch blasting, and
• Sponge j et blasting.
A brief description of each type of technology is provided below with associated benefits and limitations.
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Nofes Plastic Media Blasting (PMB)
Plastic Media Blasting (PMB) is a dry abrasive blasting process designed to replace chemical paint
stripping operations and conventional sand blasting. This process uses soft, angular plastic particles as the
blasting medium.
PMB is performed in a ventilated enclosure such as a small cabinet (glove box), a walk-in booth, a
large room, or airplane hanger. The PMB process blasts the plastic media at a much lower pressure (less than
40 psi) than conventional sand blasting. PMB is well suited for stripping paints, since the low pressure and
relatively soft plastic medium have minimal effect on the surfaces beneath the paint.
Plastic media are manufactured in 6 types and a variety of sizes and hardness. The plastic blasting
media types are:
• Type I Polyester (Thermoset),
• Type II Urea formaldehyde (Thermoset),
• Type III Melamine formaldehyde (Thermoset),
• Type IV Phenol formaldehyde (Thermoset),
• Type V Acrylic (Thermoplastic), and
• Type VI Polyallyl diglycol carbonate) (Thermoset).
PMB facilities typically use a single type of plastic media for all PMB work. For example, the
majority of Department of Defense (Air Force, Army, Navy) PMB facilities use either Type II or Type V
media. Type V media is not as hard as Type II media and is more gentle on substrates. Type V media is more
commonly used on aircraft. Type II is better for steel surfaces.
After blasting, the media is passed through a reclamation system that consists of a cyclone
centrifuge, a dual adjustable air wash, multiple vibrating classifier screen decks, and a magnetic separator. In
addition, some manufacturers provide dense particle separators as a reclamation system. The denser particles,
such as paint chips, are separated from the reusable blast media, and the reusable media is returned to the
blast pot. Typically, media can be recycled ten to twelve times before it becomes too small to remove paint
effectively. Waste material consists of blasting media and paint chips. The waste material may be classified
as a RCRA hazardous waste because of the presence of heavy metals. An alternative solution to handling this
hazardous waste is to locate a vendor that will "lease" blast media to an installation and then recycle the
media to recapture the metals. This option eliminates media waste from the PMB facility waste stream.
Benefits of Plastic Media Blasting
• Media can be recycled for use approximately 10-12 times.
• Wastewater disposal costs (typical in chemical paint stripping operations) are virtually eliminated
with PMB.
• Eliminates the production of waste solvents when compared to chemical paint stripping.
Limitations of Plastic Media Blasting
• Substantial capital equipment investment is required.
• Solid wastes may have to be disposed as a hazardous waste.
• Operator time, maintenance requirements, handling and disposal of waste varies with material to be
stripped.
• Quality of stripping is dependent on skill and experience level of the operator.
• Military specifications do not allow PMB for depainting certain types of materials.
• May not remove corrosion.
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Wheat Starch Blasting
Wheat starch blasting is a user-friendly blasting process wherein wheat starch can be used in systems
designed for plastic media blasting (PMB), as well as systems specifically designed for wheat starch blasting.
The wheat starch abrasive media is a crystallized form that is non-toxic, biodegradable, and made from
renewable resources. The media is similar in appearance to plastic media, except that it is softer.
The wheat starch blasting process propels the media at less than a 35-psi nozzle pressure for most
applications. The low pressure and relatively soft media have minimal effect on the surfaces beneath the
paint. For this reason, wheat starch is well suited for stripping paints without risking damage to the substrate.
Examples include removing paint from aluminum alloys and composites like graphite, fiberglass, and aramid
(Kevlar™).
The wheat starch blasting process can remove a variety of coatings. Coating types range from
resilient rain-erosion resistant coatings found on radomes and radar absorbing materials to the tough
polyurethane and epoxy paint systems. The wheat starch system has been shown to be effective in removing
bonding adhesive flash (leaving the metal to metal bond primer intact), vinyl coatings, and sealants. It has
also been found effective in removing paint from cadmium parts, while leaving the cadmium plating intact.
There are several important components required for wheat starch systems. First, a moisture control
system is needed to control the storage conditions of the medium. This is important when the system is shut
down for extended periods of time. Second, to remove contaminants from the wheat starch media, the spent
wheat starch residue is dissolved in water and then either filtered or separated in a dense particle
separator/centrifuge. The wheat starch media is recycled in the system and may be used for up to 15 to 20
cycles. Low levels of dense particle contamination in the media may result in a rough surface finish on
delicate substrates. The waste stream produced from this process is sludge generated from the wheat starch
recycling system. This system produces approximately 85% less waste sludge compared to chemical
stripping.
Benefits of Wheat Starch Blasting
• Wheat starch is a natural resource that is biodegradable.
• Waste can be treated in a bioreactor.
• Waste volume requiring disposal is estimated to be only five percent of the original volume.
• Can be used for removing coatings from both metallic and composite materials.
• Process is very controllable; it can be used to selectively remove from one to all coating layers.
• Does not cause fatigue to the substrate surface.
• Moderate stripping rates can be achieved while maintaining a gentle stripping action.
• Safe on soft-clad aluminum.
• Media is inexpensive and non-toxic.
• No size limitations on parts.
Limitations of Wheat Starch Blasting
• High capital investment cost.
• Requires complex subsystems for media recovery and recycling and dust collection and control.
• Operator training required.
• Low levels of dense particle contamination in the media may result in a rough surface finish on
delicate substrates.
• Waste material may be hazardous and require disposal that may be costly.
• Typically slow to moderate stripping rate.
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*T . Sponge Jet Blasting
Sponge jet blasting is a form of abrasive blasting which uses grit-impregnated foam and foam
without grit as the blasting media. The sponge blasting system incorporates these various grades of the
water-based urethane-foam for use as a cleaning media to prepare the surfaces, and the abrasive media grades
to remove surface contaminants, paints, protective coatings, and rust. In addition, the abrasive grades can be
used to roughen concrete and metallic surfaces, if desired. The abrasive media contains a variety of grit,
depending upon application, including aluminum oxide, steel, plastic, and garnet.
Sponge jet blasting equipment consists of two transportable modules, which include the feed unit
and the classifier unit. The feed unit is pneumatically powered for propelling the foam media. The unit is
portable and produced in several sizes (depending on capacity required). A hopper, mounted at the top of the
unit, holds the foam media. The medium is fed into a metering chamber that mixes the foam with
compressed air. By varying the feed unit air pressure and types of abrasive foam media used, sponge blasting
can remove a range of coatings from soot on wallpaper to high-performance protective coatings on steel and
concrete surfaces.
The classifier unit is used to remove large debris and powdery residues from the foam medium after
each use. The used media is collected and placed into an electrically powered sifter. The vibrating sifter
classifies the used medium with a stack of progressively finer screens. Coarse contaminants, such as paint
flakes, rust particles, etc. are collected on the coarsest screens. The reusable foam media are collected on the
corresponding screen size. The dust and finer particles fall through the sifter and are collected for disposal.
After classifying, the reclaimed foam media can be reused immediately in the feed unit. The abrasive
medium can be recycled approximately six times and the non-abrasive medium can be recycled
approximately 12 times.
Benefits of Sponge Jet Blasting
• Safer for operators compared to other blasting media and chemical stripper systems.
• Easily transportable.
• Waste minimization is achieved by recycling the sponge media an average of six to twelve times.
• Absorbs and removes contaminants.
• Reduces dust generation.
Limitations of Sponge Jet Blasting
• Foam media costs are greater than sand blasting media.
• Reasonably large capital investment cost.
Wet Media Blasting
Proven pollution prevention wet media blasting technologies are divided into two categories:
• High pressure water j et blasting, and
• Sodium bicarbonate blasting.
A brief description of each type of technology is provided below with associated benefits and limitations.
High Pressure Water Jet Blasting
High-pressure water blast systems are used for removing paint with low-volume water streams at
pressures ranging from 15,000 to 55,000 psi. High-pressure systems typically use pure water streams
(deionized) and specialized nozzles to achieve effects ranging from a relatively gentle, layer-by-layer removal
of organic paints to removal of metal flame spray coating and other tough, tightly adherent coatings. The
process water, paint, and residue are collected by the effluent-recovery system for filtering the paint and
residue, removing leached ions (copper, cadmium, lead, etc.), microparticulates, chlorides, sulfates, nitrates,
and other contaminants. The water passes through a coalescing tank for removing oils and film, then through
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a charcoal filter, microfilters and, finally, a deionization system to ensure that the water is Grade A deionized
water. The recovered deionized water is recycled back into the process.
Benefits of High Pressure Water Jet Blasting
• Reduces hazardous waste by 90%.
• Selectively removes individual coating-layers.
• Pre-washing and masking is not needed in most applications.
• No size limitations for parts being stripped.
• Wastewater stream is compatible with conventional industrial wastewater plants.
• Reduces the process material costs significantly.
• Reduces labor hours for the stripping process by 50%.
• No dust or airborne contaminants generated.
• Requires no cleanup after stripping.
Limitations of High Pressure Water Jet Blasting
• High capital costs.
• Removes one layer at a time.
• May not remove corrosion.
• The substrates to be removed will impact personal protection and waste collection/disposal
considerations.
• Coating debris sludge is a potential hazardous waste.
Sodium Bicarbonate Blasting
Sodium bicarbonate stripping processes are used as alternatives to traditional chemical paint
stripping. Bicarbonate of soda (or sodium bicarbonate) is a soft blast media with a heavier specific gravity
and less hardness than most plastic abrasives. The bicarbonate of soda stripping process can be used with or
without water. It is most frequently used with water, which acts as a dust suppressant. In this form,
compressed air delivers the sodium bicarbonate medium from a pressure pot to a nozzle, where the medium
mixes with a stream of water. The soda/water mixture impacts the coated surface and removes old coatings
from the substrate. The water used dissipates the heat generated by the abrasive process, reduces the amount
of dust in the air, and assists in the paint removal by hydraulic action. Workers do not need to prewash or
mask the surface of the material being stripped. Settling or filtration can separate the solid residue from the
wastewater generated from this process.
The effectiveness of bicarbonate of soda stripping depends on optimizing a number of operating
parameters, including nozzle pressure, standoff distance, angle of impingement, flow rate, water pressure, and
traverse speed. In general, bicarbonate of soda stripping systems remove paint slower than mo st methods
(other than chemical paint stripping) currently used. The type of equipment used in this stripping process
may also have significantly different results.
Use of sodium bicarbonate in its dry form (or when not fully mixed with water) can create a cloud of
dust that will require monitoring and may require containment to meet air standards and worker exposure
limitations. The dust generated is not an explosive hazard, nor is sodium bicarbonate toxic in this form.
However, the airborne particulates generated from the stripping operation can contain toxic elements from the
paint being removed. This stripping process should be performed in areas where exhaust particulates can be
contained and/or exhaust ventilation system controls are present to remove hazardous airborne metals. If
bicarbonate of soda stripping is operated outdoors, air monitoring of dust (e.g. for metals) may be necessary
to ensure that air standards are met. However, tests have shown that lead will adhere to the sodium
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JT , bicarbonate, thus reducing the risk. Be sure to have a local Industrial Health Specialist check the air for any
resident metals.
The waste generated from bicarbonate of soda stripping systems in the wet form is wet slurry
consisting of sodium bicarbonate medium, water, paint chips, and miscellaneous residues such as dirt and
grease. Some installations are employing centrifuges to separate the water from the contaminated waste
stream, thus reducing the amount of hazardous waste being disposed. Filtered wastewater containing
dissolved sodium bicarbonate may be treated at an industrial wastewater treatment plant. In its dry form,
waste generated includes nuisance dust, paint chips, and miscellaneous residues such as dust and grease. The
solid waste may be suitable for disposal in a sanitary landfill. Analysis of wastewater and waste solids is
required prior to disposal. Wastewater and bicarbonate residue disposal requirements will depend on the
toxicity of the coatings and pigments to be removed. The sodium bicarbonate medium can not be recycled.
The paint chip and miscellaneous residue wastes may be considered a hazardous waste.
Benefits of Sodium Bicarbonate Blasting
• Significant reduction in the amount of hazardous waste generated compared to chemical stripping.
• Reduces the number of hours required for paint stripping in comparison to chemical stripping.
• Selectively removes individual coating layers.
• Prewashing and masking is not required in most applications.
• No size limitations for parts being stripped.
• Wastewater stream may be centrifuged to reduce its volume or treated (if required) at industrial
wastewater treatment plants available to many installations.
• Blast media is usually less expensive than PMB, wheat starch, and CC>2 pellets.
Limitations of Sodium Bicarbonate Blasting
• Requires subsequent washing of the item; thus, electrical components cannot be exposed to this
stripping process.
• The sodium bicarbonate solution can not be recycled for stripping, although the water can be
separated for disposal.
• May require monitoring.
• Containment may be required.
Thermal Stripping
Recent advancements in paint removal technologies has led to the following types of thermal stripping:
• Flashlamp, and
• Laser.
A brief description of each type of technology is provided below with associated benefits and limitations.
Flashlamp
Flashlamp systems consist of a tubular quartz flashlamp filled with xenon gas at low pressure. A
light pulse is absorbed by the surface material, which may sublime, pylori or chemically dissociate. The
residue left on the surface is a fine, black dust, which is then wiped off.
The xenon flashlamp, or the FLASHJET™ system, uses a carbon dioxide pellet stream to sweep
away the coatings residue and cool and clean the surface. The system also includes effluent capture, process
control and robotic manipulator subsystems. The primary coating removal mechanism for the process is the
irradiation of the coated surface with high intensity light that breaks the molecular bonds within the paint
film, reducing the surface coating to fine particles and gases. The fine particles are then removed by the low
pressure carbon dioxide (dry ice) pellet blast.
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The FLASHJET™ stripping system is currently utilized on the AH-64A Apache aircraft pre-mod
program and AH-64D Longbow Apache aircraft modifications program. The stripping system is comprised
of a 6-axis gantry robot system capable of stripping the Apache fuselage and various components parts
including main/tail rotor blades, access doors, and other aluminum and Kevlar/epoxy parts. The most recent
development for application of the process embraces the design integration of the FLASHJET™ system on a
large mobile robotic manipulator capable of positioning the stripping head over all moldline surfaces of large
transport aircraft.
Benefits ofFlashlamp
• Reduced the labor required to strip an airframe from 200 to 20 man-hours.
• Can selectively remove one layer at a time without damaging the substrate.
• No hazardous waste generated.
Limitations ofFlashlamp
• High capital cost (over 2 million).
• Poor stripping over complex geometry's.
Laser
Although laser paint strippers are being used in limited applications, laser stripping is still
considered an emerging technology. All key technologies needed to build laser stripping systems are
available and have been demonstrated. The systems in use are designed to control the laser and eliminate the
need for precision robotics.
In general, laser paint stripping is a non-intrusive and low kinetic energy ablating process that
requires a minimum of surface preparation and post process activities. Laser systems use short pulses of high
peak power laser radiation to break the chemical bonds in the paint resin, which causes an instantaneous
increase in the volume of the resin. The increase causes the inorganic solids to be blown away from the
surface. The waste generated from laser stripping is the coating vaporized from the substrate.
Over the past 25 years, numerous industry and Department of Defense research and development
efforts have investigated the use of lasers for removing paint coatings from aerospace components, including
both metal and composite substrates.
For example, the Air Force has contracted with BDM Federal Inc., which has developed a high-
energy CO2 pulsed laser known as, the Laser Automated Decorating System (LADS), to remove rain erosion
coatings from composite aircraft radomes and flight control surfaces. The principal objective of the project
was to improve the quality of production that can be achieved compared to the chemical stripping process in
removing the fluoroelastomer, rain erosion coatings from radomes. Chemical stripping required considerable
scrapping and sanding, and then the radomes had to be passed to a subsequent process. Many radomes could
not be cleaned to a usable level and were subsequently scrapped. During the first month of LADS operation
seven radomes that had been scrapped were reclaimed.
The Army contracted with Silicon ALPS to procure an automated laser paint stripping (ALPS) cell.
Corpus Christi Army Depot procured model LS4000, which uses a high-energy CO2 pulsed laser with real-
time vision feedback control to remove coatings from medium to large components, employing both robotic
arm and rotational parts positioners. The system was procured specifically for stripping helicopter rotor
blades.
Laser paint stripping is still in its infancy; however, the technology is proven to be easily adaptable
to different paint systems and substrates. It is the only known efficient method of stripping that generates less
disposable waste than the initial volume of paint applied.
Benefits of Laser Stripping
• Specific organic contaminants may be removed while minimizing damage to the substrate.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 175
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Industrial Operations: Paper and Pulp Manufacturing
N Limitations of Laser Stripping
• Characteristics of both the contaminant and substrate must be known so that the optimal absorption
frequency can be used.
• The system is time and equipment intensive.
Cryogenic Stripping
Cryogenic paint stripping can be classified into the following two categories:
• Carbon dioxide pellet blasting, and
• Liquid nitrogen blasting.
A brief description of each type of technology is provided below with associated benefits and limitations.
Carbon Dioxide Pellet Blasting
Carbon dioxide (CC>2) blasting is an alternative process to chemical cleaning and paint stripping.
The obvious advantage of CC>2 blasting over chemical stripping is the introduction of the inert CC>2 medium
that dissipates.
CC>2 pellets are uniform in shape and the effectiveness of the pellets as a blast medium is similar to
abrasive blasting media. However, the pellets do not affect the substrate; therefore, CC>2 pellet blasting is
technically not an abrasive operation. This process can be used for cleaning, degreasing, some de-painting
applications, surface preparation, and de-flashing (flashing is the excess material formed on the edges of
molded parts).
The process starts with liquid CO2 stored under pressure (-850 psig). The liquid CO2 is fed to a
pelletizer, which converts the liquid into solid CO2 snow (dry ice flakes), and then compresses the dry ice
flakes into pellets at about -110 °F. The pellets are metered into a compressed air stream and applied to a
surface by manual or automated equipment with specially designed blasting nozzles. The CO2 pellets are
projected onto the target surface at high speed. As the dry ice pellets strike the surface, they induce an
extreme difference in temperature (thermal shock) between the coating and the underlying substrate,
weakening the chemical and physical bonds between the surface materials and the substrate. Immediately
after impact, the pellets begin to vaporize, releasing CC>2 gas at a very high velocity along the surface to be
cleaned. The high velocity is caused by the extreme density difference between the gas and solid phases. This
kinetic energy dislodges the contaminants (coating systems, contaminants, flash, etc.), resulting in a clean
surface. Variables that allow process optimization include the following: pellet density, mass flow, pellet
velocity, and propellant stream temperature.
CC>2 pellet blasting is effective in removing some paints, sealants, carbon and corrosion deposits,
grease, oil, and adhesives, as well as solder and flux from printed circuit board assemblies. Furthermore,
since CO2 pellet blasting is not an abrasive operation, it is excellent for components with tight tolerances.
This process also provides excellent surface preparation prior to application of coatings or adhesive and is
suitable for most metals and some composite materials. However, thin materials may be adversely affected.
Blasting efficiency is approximately equal to that of other blasting operations and can approach 1 ft /minute
after optimization. CC>2 blasting can be done at various velocities: subsonic, sonic, and even supersonic.
Therefore, equipment noise levels are high (between 95 and 130 dB). This operation always requires hearing
protection.
Waste cleanup and disposal are minimized because only the coating remains after blasting. There is
no liquid waste because CC>2 pellets disintegrate. They pass from liquid to gaseous state, leaving no spent
medium residue. With regard to toxic air control, small quantities of coating particles are emitted to the air.
A standard air filtration system should be provided.
Benefits of Carbon Dioxide Pellet Blasting
• Significant reduction in the amount of hazardous waste and hazardous air emissions generated
compared to chemical stripping.
• Time required for cleaning/stripping processes is reduced by 80-90%.
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Industrial Operations: Paper and Pulp Manufacturing
• Leaves no residue on the component surface.
• Effective in precision cleaning.
• Introduces no new contaminants.
Limitations of Carbon Dioxide Pellet Blasting
• CC>2 blasting is not always a one-pass operation; an effective blasting operation usually requires
multiple passes to achieve the desired effect.
• Can have high capital costs.
• Fixed position blasting operation can damage the component's surface.
• Generates solid waste containing coating chips that are potentially hazardous; medium does not add
to the volume of solid waste.
• Rebounding pellets may carry coating debris and contaminate workers and work area.
• Some coating debris may redeposit on substrate.
• Nonautomated system fatigues workers quickly because of cold temperature, weight, and thrust of
the blast nozzle.
Liquid Nitrogen Blasting
Liquid nitrogen cryogenic blasting is a variation of the PMB method that involves chilling the work
piece to embrittle the coating before subjecting it to impaction with a plastic media. The piece is sprayed
with liquid nitrogen as it rotates on a spindle within a cabinet, and then is blasted with the impaction media,
which are projected into the cabinet by throw wheels.
After chilling the coating to about -320 °F, the liquid nitrogen warms to ambient temperatures and
evaporates into a gaseous form. This harmless gas can be vented to the atmosphere, leaving the medium to be
collected, separated from coating debris, and recycled.
The liquid nitrogen cryogenic blasting approach is used primarily to remove coating build-up from
certain types of process equipment used in paints and coatings operations (e.g., paint hangers, coating racks,
floor gratings). Operations in the automotive and appliance industries have used this method with success.
Benefits of Liquid Nitrogen Blasting
• Minimizes pollution generation. Avoids generation of wastewater and VOCs; because the process is
dry, no water is used.
• Recyclability. If the correct plastic medium is selected, they can be recycled numerous times.
• High throughput. Can be effective at a relatively high coating removal rate.
• Low operating costs. Compressed air and electricity requirements are low.
Limitations of Liquid Nitrogen Blasting
• Capital and startup costs can be high.
• Not appropriate for thin coatings and less effective on epoxies and urethanes.
• The stripping cabinet restricts the size of parts that can be processed.
5.9.3.2 Recycling
In-process recycling is another method of reducing the environmental impacts from paint removal
operations. In relation to paint removal operations, recycling generally consists of removing the paint coating
particles from either the solvent or blast media through filtration, distillation, or gravity separation to extend
the useful life of the solvent or media. For chemical or petroleum hydrocarbon based paint removers, in-
process distillation can be used to extend the bath life of a dip tank indefinitely if conducted properly
(selective additives may be necessary to add to the original solution to maintain all performance
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 177
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Industrial Operations: Paper and Pulp Manufacturing
JT , characteristics). A complete process description for the distillation of petroleum hydrocarbon based solvents
is provided in Section 5.5, Cleaning & Degreasing.
The required technique for in-process recycling of blast media is dependent on the media type
(sponge, PMB, water, etc.). Recycling methods for each type of alternative blast media described under the
source reduction options is contained with in the process description and operating requirements of each.
5.10 Printing
The following section provides a process description, waste description and a broad range of
pollution prevention opportunities that can be implemented to improve commercial printing operations.
5.10.1 Process Description
The printing industry consists of establishments engaged in printing by lithography, gravure,
flexography, letterpress, and screen printing. Presses are also categorized by the forms of paper or other
substances used. Web presses, which are used for larger printing runs, print the image onto a continuous roll
(web) of paper. After printing, the paper is slit (cut) and trimmed to the preferred size. Sheet-fed presses
print on individual sheets of paper or the substrate. The following provides a brief overview of each type of
printing process.
• Letterpress - is the oldest and the most versatile of the printing methods. Printing, accomplished
with a relief method, utilizes cast metal types or plates on which the image or printing areas are
raised above the nonprinting areas. Ink rollers touch only the top surface of the raised areas. The
nonprinting areas are lower and do not receive ink. Printing is done on sheets of paper on sheet-fed
presses or rolls of paper on web-fed presses. Sheet-fed presses are used for general printing, books,
catalogues, and packaging. Web-presses are used for news papers and magazines.
• Flexography - is a form of rotary web letterpress that uses flexible runner plates and fast drying
solvent or water-based inks. The rubber plates are mounted to the printing cylinder. Products
printed by the flexographic process range from decorated toilet tissue to polyethylene and other
plastic films.
• Gravure - is a type of intaglio printing that uses a depressed (or sunken) surface for the image. The
image area consists of cells or wells etched into a copper cylinder or wraparound plate. The printing
area is the cylinder or plate surface. The plate cylinder is rotated in an ink bath, and the excess ink is
wiped off the surface by a flexible steel "doctor blade." The remaining ink in the thousands of
sunken cells form the images as the paper passes between the plate cylinder and the impression
cylinder. Gravure presses are manufactured to print sheets of paper (sheet fed gravure) or rolls of
paper (web-fed gravure); however, the web-fed gravure is more popular.
• Lithography - is the most common printing process, and a printing method known as planographic.
The image and the nonprinting areas are on the same plane as a thin metal plate, and the areas are
distinguished by chemicals. Lithography is based on the principal that grease and water do not mix.
The ink is offset first from the plate to a rubber blanket and then from the blanket to the paper. The
printing areas in the plate are made ink receptive and water repellent, and the nonprinting areas are
made ink repellent and water receptive. The plate is mounted on the plate cylinder, which rotates
and comes in contact with rollers that are wet by a dampening solution (or water) and rollers that are
wet by ink in succession. The ink wets the image areas, which are then transferred to the
intermediate blanket cylinder. The image is printed to the paper as the paper passes the blanket
cylinder and the impression cylinder. The major advantage of transferring the image from the plate
to a blanket before transferring to the paper (offsetting) is that the soft rubber surface of the blanket
creates a clearer impression on a wide variety of paper surfaces and other substrate materials. The
process of lithography is applied to individual sheets, known as sheet-fed lithography, and onto a
continuous roll (web) of paper, known as web-offset lithography. Sheet-fed lithography is used for
printing books, posters, greeting cards, labels, packaging, advertising flyers and brochures,
periodicals, and reproducing artwork. Web-offset lithography is used for periodicals, newspapers,
advertising, books, catalogues, and business forms.
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Industrial Operations: Printing
• Screen Printing - employs a porous screen of fine silk, nylon, or stainless steel mounted on a frame.
Printing is done on the paper by applying ink to the screen, then spreading and forcing ink through
the fine openings with a rubber squeegee. Versatility is the major advantage of screen printing since
any surface (e.g., wood, glass, metal, plastic, fabric, etc.) can be printed.
The principle raw materials used by the commercial printing industry are inks and substrates. A
substrate is any material upon which ink is impressed, such as paper, plastic, wood, or metal.
Other raw materials used by the industry include gravure cylinders, photographic films,
photoprocessing chemicals developers, fixers, wash baths, reducers, intensifiers, printing plates, plate
processing chemicals, fountain solutions, cleaning solvents, and rags. Exhibit 5.12 illustrates a typical
commercial offset lithographic printing operation. Printing begins with the preparation of artwork or copy,
which is photographed to produce an image. A proof is made which will be used to compare with the printed
product and make adjustments to the press. The photographic image is transferred to a plate. In the
platemaking step, the image areas of the plate are made receptive to the ink. In the printing step, ink is
applied to the plate, then transferred to rubber blanket and then to the substrate.
The substrate accepts the ink, reproducing the image. The substrate is then cut, folded, and bound to
produce the final product. Printing can be divided into six separate steps: (1) image processing, (2) proofing,
(3) platemaking, (4) makeready, (5) printing, (6) finishing. The operations involved in these steps are
summarized below.
5.10.1.1 Image Processing
Most printing operations begin with art and copy (or text) preparation. Once the material is properly
arranged, it is photographed to produce transparencies. If an image is to be printed as a full color
reproduction, then color separations are made to provide a single-color image or record which can then be
used to produce this single -color printing plate for lithography or the cylinder for gravure. Once the film has
been developed, checked, and re-photographed (if necessary), it is sent on to the plate- or cylinder-making
operation.
The printing industry employs graphic arts photography in the reproduction of both artwork and
copy, using materials similar to those in other fields of photography. The materials include a paper, plastic
film, or glass base cover with a light-sensitive coating called a photographic emulsion. This emulsion is
usually composed of silver halide salts in gelatin. Silver halides include silver chloride, silver bromide and
silver iodide.
Some processes such as letterpress or lithography use a photographic negative to transfer an image
to the plate. Gravure, screen printing, and other lithographic processes require positives. These are produced
by printing negatives onto paper or film. The resulting images have tone values similar to the object or copy
that was photographed.
5.10.1.2 Proof
A proof is produced after the image processing step as part of internal job control, and it may also
serve as a communication tool between printer and client. It is used for both single-color and multi-color
printing.
5.10.1.3 Plate Processing
The type of printing process depends on the intermediate image carrier, a plate or cylinder that
accepts ink off a roller and transfers the image to a rubber blanket. The blanket, in turn, transfers it to the
paper. The type of ink and press used, number of impressions that can be printed, the speed with which they
are printed, and the characteristics of the image are all determined by the type of image carrier.
The four different types of image carriers generally used are manual, mechanical, electrostatic, and
photomechanical.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 179
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Industrial Operations: Printing
Notes
Exhibit 5.12: Process Flow Diagram for a Typical Commercial Printing Operation
( Start J
~^
Film-
Photoprocessing Chemicals_
(concentrate & water)
Image Processing
HJsedFilm
Image on Film ^Silver Recovery
Proof
Plates from Storage or
Plate Manufacturing
Plate Processing Chemicals"
Ink-
Paper-
Fountain Solution"
Platemaking
Image on Paper
Makeready
'Trash
^Wastewater
^Trash
^Paper to Recycling
^Air Emissions
Ink
Paper
Fountain Solutioi
Cleaning Solvent
Rags
Printing and Drying
Untrimmed, Unbound Product
Paper Wrap to Trash
'Paper to Recycling
'Air Emissions/Emission Controls
'Waste Ink
Dirty Rags and Used Plates
Finishing
> Trash (Paper Trimmings)
Final Product
E"d
• Manual Image Carriers - consist of hand-set composition, wood cuts, linoleum blocks, copperplate or
steel-die engravings. Manually made images are seldom used now except for commercial use in screen
printing.
• Mechanical Image Carriers - are produced mainly for relief printing. There are two categories: (1) hot
metal machine composition and (2) duplicate printing plates. Intaglio printing also uses mechanically
made plates. These include pantograph engravings, used for steel-die engraving, and engraving made
with geometric lathes, which produce scrolls for stock and bond certificates and paper currency.
Mechanically made gravure cylinders are also used for printing textiles, wrapping papers, wallpapers,
and plastics.
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Industrial Operations: Printing
• Electrostatic Plates - are popular in reprography (offset duplicating) where electroplating cameras
convert original images or paste-ups to lithographic plates used on copier/duplicators. Electrostatically
produced plates are also used for imaging from paste-ups and for laser platemaking used in newspaper
printing.
• Photomechanical Platemaking - is the common method of plate making. These image carriers use light
sensitive coatings on which images are produces photographically. Photomechanics is capable of
reproducing photographs and other pictorial subjects. This overcomes the limitations of manually and
mechanically produced plates.
5.10.1.4 Makeready
Makeready is the procedure in which all the adjustments are made on the press, including proper
registration and ink density, to achieve a reproduction equivalent to or comparable to the proof of acceptable
quality to the pressman or customer's representative. This step may be the major source of waste from the
printer's point of view. Makeready times can last from a few minutes to many hours. Makeready can be
conducted at low speeds or at press production speeds. The printer's objective is to minimize both the time
involved in makeready and the number of waste sheets or signatures coming off the press.
5.10.1.5 Printing
Once the plates are prepared, the actual printing can begin. The printing operations are generally the
same for each of the major processes, with the exception of screen printing. The two common types of
presses can print up to 3 impressions per second. Web presses typically print at a rate of 1,000 to 1,600 feet
per minute.
Preparation for printing begins by attaching the plate to the plate cylinder of the press. Virtually all
presses print from a plate cylinder, as opposed to a flat plate. Each unit of printing press prints a single color.
To print a full color illustration, four separate units are typically required, one unit each for magenta, cyan,
yellow, and black.
After printing, the substrate may pass through a drying operation depending on the type of ink used.
For example, lithography can use heat-set and non-heat-set inks. In heat-set lithography, the substrate is
passed through a tunnel or float dryer which utilizes hot air or direct flame or combination. With non-heat-set
lithography, the ink normally dries by absorption. Where as gravure printing utilizes inks that dry by solvent
evaporation.
5.10.1.6 Finishing
The term "finishing" refers to final trimming, folding, collating, binding, laminating, and/or
embossing operations. A variety of binding methods are used for books, periodicals, and pamphlets. These
include stitching (stapling), gluing, and mechanical binding. These finishing operations are frequently
accomplished by an outside service organization.
5.10.2 Waste Description
The principal wastes associated with commercial printing operations are off-spec paper (printed and
unprinted), spent printing solutions, cleaning solvents, air emissions (from printing operations) and
miscellaneous secondary wastes.
By volume, paper is the largest waste stream associated with the printing industry; almost 98% of
the total waste generated is spoiled paper and paper wrap. Waste paper comes from rejected print runs, scraps
from the starts and ends of runs, and overruns (excess number of copies made to ensure that there are enough
acceptable copies). Most paper is recycled, incinerated, or disposed of as solid waste (trash).
Spent photoprocessing chemicals are generally biodegradable with high BOD (biochemical oxygen
demand), therefore, it is generally necessary to treat the waste before discharging to sanitary sewers. For
larger printing companies, it may be economical and necessary to recover silver from the spent solution.
Exhibit 5.13 summarizes the process origin and composition of each waste stream. In addition, the
wastes generated from each step of the printing process are also included.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 181
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Industrial Operations: Printing
Notes
By volume, paper is the largest waste stream associated with the printing industry; almost 98% of
the total waste generated is spoiled paper and paper wrap. Waste paper comes from rejected print runs, scraps
from the starts and ends of runs, and overruns (excess number of copies made to ensure that there are enough
acceptable copies). Most paper is recycled, incinerated, or disposed of as solid waste (trash).
Spent photoprocessing chemicals are generally biodegradable with high BOD (biochemical oxygen
demand), therefore, it is generally necessary to treat the waste before discharging to sanitary sewers. For
larger printing companies, it may be economical and necessary to recover silver from the spent solution.
Exhibit 5.13: Wastes from Printing
Waste
Description
Paper
Printing
Solutions
Cleaning
Solvents
Air Emissions
Miscellaneous
Process Origin
Makeready
Printing
Image Processing
Platemaking
Printing & Proof
Makeready & Printing
Image Processing & Proofing
Platemaking
Composition
Inked and clean sheets.
Inked sheets.
Photographic chemicals, silver (if not
recovered).
Acids, alkali, solvents, plate coatings (may
contain dyes, photopolymers , binders, resins,
pigments, organic acids), developers (may
contain isopropanol, gum arabic, lacquers,
caustics), and rinse water.
Lubricating oils, waste ink, cleanup solvents
(halogenated and non-halogenated), and rags.
Solvent from heat-set inks, isopropyl alcohol
(fountain solution), and cleaning solution.
Empty containers, packages, used film, and
outdated materials.
Damaged plates, developed film, and outdated
materials.
Platemaking wastes (e.g., acids and bases used to clean or develop the plates) must be either sent to a
wastewater treatment facility or drummed for disposal. Platemaking wastes are minimal for those facilities
that use presensitized plates. Fountain solutions used in lithography contain gum arabic, phosphoric acid,
defoamers, and fungicides. Isopropyl alcohol (IPA) is usually added to reduce the surface tension of the
solution, making it adhere better to the nonimage areas of the plate cylinder. Most of the IPA evaporates with
water and the other chemicals remaining on the paper. Some chemical manufactures offer low volatility
fountain solutions that do not use IPA or other volatile compounds. Equipment-cleaning wastes include spent
lubricants, waste inks, cleanup solvents, and rags. Waste ink is the ink removed form the ink fountain at the
end of a run, or contaminated ink. Although most of the ink used by a printing company ends up on the paper
(or other substrate), other ink losses include spills and ink printed on waste paper. Most waste inks are either
incinerated (if considered hazardous) or discarded as solid waste.
Cleanup solvents are used to clean the press. The rubber blankets are cleaned once or twice per 8-
hour shift to minimize the imperfections resulting from dirt or dried inks. When lower quality paper is used,
cleaning is required more frequently. The cleaning solvents include methanol, toluene, naphtha,
trichloroethane, methylene chloride, and specially formulated blanket washes.
Inks may contain solvents (e.g., xylene, ketones, alcoholc, etc.), depending on the type of printing
process and substrate. For example, gravure printing inks contain solvents. The inks used for offset
lithography are explained below.
• Sheet-fed inks that dry by oxidative polymerization.
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Industrial Operations: Printing
• Heat-set inks that dry by evaporation of aliphatic ink oils.
• Non-heat-set web inks that dry by absorption of the ink on the substrate.
No significant amount of VOCs (volatile organic compounds) are emitted from sheet-fed inks or
non-heat-set web inks. For heat-set inks, the printed web passes through a dryer where ink oils are
evaporated. The resulting VOC emissions can be controlled by catalytic or thermal incineration, or by
condenser systems. For VOC emissions from gravure printing, carbon absorption is the most commonly
applied control method.
Commercial printing operations also generate secondary wastes, such as, packaging material,
damaged plates, paper wrapping, etc. This waste stream is classified as miscellaneous wastes due to its broad
nature.
5.10.3 Pollution Prevention Opportunities
Pollution prevention opportunities for printing operations are classified according to the waste
management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-process)
recycling options.
5.10.3.1 Source Reduction
Source reduction efforts are centralized around process modifications for the printing industry.
Identified opportunities are grouped according to the four main processing steps; image processing, plate
processing, makeready, and printing/finishing. The following describes the benefits and limitations of
potential source reduction opportunities for each step.
Image Processing
The major waste stream associated with image processing is wastewater, which contains
photographic chemicals and silver removed from film. The use of computerized electronic prepress systems
for typesetting and copy preparation is a recent advance in image-processing steps. The electronic scanner
scans the image fed by text, photos, and graphics, and the copy is edited on a computer display monitor rather
than paper. This reduces the number of films and the amount of developing chemicals and paper used.
The wastes from photoprocessing that use silver films may be considered hazardous, depending on
the silver concentration. Photographic materials that do not contain silver are available, but they are slower to
develop than silver halide films. Diazo and vesicular films have been used for many years. Vesicular films
have a honeycomb -like cross section and are coated with a thermoplastic resin and light sensitive diazonium
salt. Recently, photopolymer and electrostatic films have been used. Photopolymer films contain carbon
black as a substitute for silver, and the films are processed in a weak basic solution that needs to be
neutralized before disposal. Electrostatic films are nonsilver films that can be developed at a speed
comparable to that of silver films. An electrostatic charge makes the film light sensitive, and a liquid toner
brings out the image after the film is exposed to light. Electrostatic films also have high resolution.
Extending the life of fixing baths can reduce waste from photographic processing. Techniques for
extending bath life are explained below.
• Addition of ammonium thiosulfate, which increases the maximum allowable concentration of silver
in the bath.
• Use of an acid stop bath prior to fixing bath.
• Addition of acetic acid to keep the pH low.
Close monitoring of the process bath and optimizing the bath conditions will minimize the use of bath
chemicals.
Squeegees can be used to wipe excess liquid from the film and paper in a nonautomated processing
system. This can reduce the chemical carryover from one process bath to the next by as much as 50 percent.
Minimizing chemical contamination of the process baths increases recyclability and bath life, and reduces the
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 183
Notes
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Industrial Operations: Printing
JT , amount of replenisher chemical required. However, squeegees must be used only after the film image has
hardened, because they can damage the image if it has not fully hardened.
During photographic processing, films are commonly washed with water, using parallel tanks
systems to remove hypo from the emulsion. In a parallel system, fresh water enters each wash tank and
effluent leaves each wash tank. Employing a countercurrent washing system can increase the removal
efficiency of hypo.
Benefits of Image Processing Changes
• Computerized prepress systems for typesetting and copy preparation reduce the number of films and
the amount of developing chemicals and paper used.
• Nonhazardous films may be utilized instead of hazardous silver halide films.
• Electrostatic films are nonsilver films that can be developed at a speed comparable to that of silver
films.
• Squeegees used to wipe excess liquid from film and paper can reduce chemical carry over by 50%,
therefore increasing recyclability and bath life, and reducing the amount of replenisher chemicals
required.
Limitations of Image Processing Changes
• High initial costs may prohibit smaller printing operations from using computerized prepress
systems.
• Nonsilver films are typically slower to develop than the silver halide films.
• Squeegees can damage film if the image has not fully hardened.
Plate Processing
Recent advances in plate-processing techniques have reduced the quantity and/or toxicity of
hazardous wastes and improved worker safety. In gravure printing, metal etching and metal plating
operations involve chemical compounds that are generally considered hazardous. Waste solutions from metal
etching or metal plating usually require treatment before discharge to a municipal sewer. The same is true for
all wastewater used in plate rinsing operations. The use of multiple countercurrent rinse tanks can reduce the
amount of wastewater generated. Minimizing drag-out from the plating tanks can reduce the toxicity of
wastewater from plating. Drag-out can be reduced by the following process changes.
• Installing a drainage rack.
• Using draining boards to collect the drag-out and returning it to the plating tank.
• Raising the plate tank temperature to reduce the viscosity and surface tension of the solution.
The printer should consider replacing metal etching or plating processes with presensitized
lithographic plates, plastic or photopolymer plates, or hot metal plates, which do not generate hazardous
wastes. The wastes generated by presensitized lithographic plates are wastewater from developing and
finishing baths and used plates. Consumption of chemicals can be reduced by frequently monitoring the bath
pH, temperature, and solution strength, thereby extending the bath life. Automatic plate processors may also
be used since they are designed to maintain the optimum bath conditions.
Nonhazardous developers and fnishers are also available. For example, some developers and
finishers have a flash point of 213 °F and are therefore considered nonflammable. Presensitized plates that
are processed only with water are also available.
Benefits of Plate Processing Changes
• Nonhazardous and nonflammable developers and finishers can replace hazardous and flammable
developers and finishers.
184 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Industrial Operations: Printing
• Counter current rinse tanks can decrease the amount of wastewater generated, and increase
efficiency.
• Presensitized lithographic plates, plastic plates, or hot metal plates can replace hazardous waste
generating metal etching or plating processes.
Limitations of Plate Processing Changes
• Counter current rinse systems require a large amount of floor space and a high initial equipment cost.
• Modifying the type of plates used can be expensive.
Makeready
Paper is the largest raw material item and is the most expensive component of the printing operation.
The printed paper produced in a makeready is frequently the largest waste a printer generates, but it is
nonhazardous. The amount of paper waste is determined by the efficiency of the press adjustments needed to
achieve the desired print quality (e.g., proper ink density and accurate registration).
With proper use, automated press adjustment devices can speed up the makeready step and save
paper and ink. Examples of these devices are automated plate benders, automated plate scanners, automatic
ink density setting systems, computerized registration and ink/water ratio sensors. It is important, however,
that the cost of these items be considered against the degree of quality improvement and the extent of waste
reduction.
Benefits ofMakereadv Changes
• Automated equipment can speed up the makeready stage.
• Ink and paper cost savings may be realized with efficient adjustments.
Limitations ofMakereadv Changes
• Improvements in quality and waste reduction may not warrant cost of technology.
• The capital costs of automated equipment are high.
Printing and Finishing
The major waste associated with printing and finishing are scrap paper, waste ink, and cleaning
solvents. The solvent waste stream consists of waste ink, ink solvents, lubricating oil, and cleaning solvents.
Wastes generated by the printing and finishing operations can be reduced by the following equipment and
techniques.
• Adopting a standard ink sequence - can reduce the amount of waste ink and waste cleaning solvents.
If a standard ink sequence is employed, ink rotation is not changed with a job and it is not necessary
to clean out fountains in order to change ink rotation.
• A web break detector - can note tears in the web. If tears are not detected, the broken web begins to
wrap around the rollers and force them out of the bearing. Although web break detectors are
primarily used to avoid severe damage to the presses, they also reduce paper and ink wastes by
preventing press damage.
• An automatic ink level controller - can be used to maintain the desired ink level in the fountain and
to optimize process conditions.
• Water-based inks - may be used in place of inks that contain oils. Applications for water-based inks
are flexographic printing on paper and gravure. Although water-based ink reduces emissions that
result from evaporation of ink oils, it is more difficult to dry and makes equipment cleaning more
difficult.
• UV inks - consist of one or more monomers and a photosynthesizer that selectively absorbs energy.
UV inks do not contain solvents, and the inks are not "cured" until they are exposed to UV light.
Therefore, UV inks can remain in the ink fountains (and plates) for longer periods of time, reducing
cleanup frequency. UV inks are particularly recommended for letterpress and lithography.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 185
Notes
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Industrial Operations: Printing
JT , Although UV inks reduce the amount of waste generated, they cost 75 to 100 percent more than
conventional heat-set inks and some of the chemicals in these inks are toxic. In addition,
conventional commercial paper recycling procedures cannot de-ink papers printed by UV inks.
• Automatic blanket cleaners - can also be used to increase efficiency, thereby reducing the amount of
waste generated. An automatic blanket cleaner consists of a controller box, a solvent metering box
for each processing unit, and a cloth handling unit. Less toxic and less flammable blanket washers
are now available, replacing cleaning solvents that contain benzene, carbon tetrachloride, and
trichlorethylene. However, these new blanket washers have a lower cleaning efficiency.
• Reduce the amount of cleaning solvents - by cleaning ink fountains only when different color ink is
used or when the ink may dry out between runs. Aerosol sprays are available to spray onto the ink
fountains to prevent overnight drying and to eliminate the need for cleaning the fountains at the end
of the day. This reduces the amount of waste ink generated and the amount of cleaning solvents
used.
• Alternative printing technologies - such as electrostatic screen printing, also know as pressure-less
printing should be considered. In electrostatic screen printing, a thin flexible printing element with a
finely screened opening is used to define the image to be printed. An electric field is established
between the image element and the surface to be printed. Finely divided "electroscopic" ink
particles, metered through the image openings, are attracted to the printing surface and held by
electrostatic force until they are fixed by heat or chemicals.
Benefits of Printing and Finishing Changes
• UV inks reduce the amount of waste generated.
• Web break detectors reduce paper and ink wastes, and prevent press damage.
• Water-based inks reduce emissions that result from evaporation of ink oils.
Limitations of Printing and Finishing Changes
• UV inks cost 75 to 100% more than conventional inks.
• UV inks contain toxic chemicals.
• Conventional commercial paper recycling procedures cannot de-ink papers printed by UV inks.
• Water-based inks are more difficult to dry and make equipment harder to clean.
• Less toxic and less flammable blanket washers are generally less efficient.
5.10.3.2 Recycling
Many of the materials essential to the commercial printing industry can be recycled or reused.
Fortunately, this recycling has both economic and environmental benefits. The main recyclable materials and
their common method of recycling are listed below.
Waste Inks
The main recycling technique for waste inks relies on the blending of different colors together to
make black ink. Small amounts of certain colors or black toner may be needed to obtain an acceptable black
color. Recycling to get black ink is generally more practical than recycling to get the original color. This
reformulated black ink is comparable to some lower quality new black inks, such as newspaper ink. For this
reason, much of the black ink for newspaper printing contains recycled ink.
Labor time necessary to fill, operate, and empty foe ink recycler is about the same as the labor
required to pack waste ink into drums and to manifest it. Therefore, the labor savings is not significant. The
major operating cost savings are reductions in raw materials costs and waste disposal costs.
Benefits of Waste Ink Recycling
• Raw material and waste disposal costs decrease.
186 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Industrial Operations: Printing
• Labor time to operate ink recycler is about equal to the time required to pack waste ink for disposal.
• Most waste ink can be recycled.
• Reduces the mass of waste ink entering the waste stream.
Limitations of Waste Ink Recycling
• Recycling to get colored ink is unpractical.
• Reformulated ink is lower quality, mainly usable only for newspaper printing.
Empty Containers
Most ink containers are scraped once empty and discarded as solid waste. Since the degree of
cleanliness is a function of operator effort, the amount of ink discarded can vary widely. By purchasing ink
in recyclable bulk containers, the container can be returned to the ink supplier for refilling instead of being
thrown away. Additionally, the use of bulk containers cuts down on the amount of cleaning required since
the surface area of the container per unit volume of ink stored is reduced.
Benefits of Empty Container Recycling
• Bulk containers require less cleaning time p er volume of ink.
• Disposal costs are reduced.
• Amount of containers entering the waste stream is reduced.
Limitations of Empty Container Recycling.
• Higher costs may be encountered for reusable versus disposable containers.
Waste Paper
Paper is the largest supply item a printer buys and it may be the most expensive component of his
work, therefore, paper use and the disposition of waste paper are critical concerns. Many printers segregate
and recycle paper according to grade: unprinted white paper is sent separately to recycling; inked paper is one
grade and is recycled separately; and wrappers for paper, which are a lower grade, are also recycled
separately.
Benefits of Waste Paper Recycling
• Reduces mass of paper entering the waste stream.
• Reduces raw material costs.
Limitations of Waste P aper Recycling
• It is not economical to recycle lower grade paper.
• Separating the paper by grade requires extra time.
Lube Oils
When the printing presses are lubricated with oil, the used oil should be collected and turned over to
a recycler. The recycler can re-refine the oil into new lubricating oil, create fuel grade oil, or use it for
blending into asphalt.
Benefits of Lube Oil Recycling
• Saves potentially hazardous materials from land disposal.
• Reduces disposal costs.
Limitations of Lube Oil Recycling
• The lubricating oils can be difficult to recover.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 187
Notes
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Industrial Operations: Printing
JT , Silver and Other Photoprocessing Chemicals
Basically, photoprocessing chemicals consist of developer, fixer, and rinse water. Keeping the
individual process baths as uncontaminated as possible is a prerequisite to the successful recycling of these
chemicals. Silver is a component in most photographic films and paper and is present in the wastewater
produced. Various economical methods of recovering silver are available (e.g. metallic replacement,
chemical precipitation, electrolytic recovery), and a number of companies market equipment that will suit the
needs of even the smallest printing shop.
A common method of silver recovery is electrolytic deposition. In an electrolytic recovery unit, a
low voltage direct current is created between a carbon anode and a stainless steel cathode. Metallic silver
plates onto the cathode. Once the silver is removed, the fixing bath may be able to be reused in the
photographic development process by mixing the de-silvered solution with fresh solution. Recovered silver is
worth about 80% of its commodity price.
Another method of silver recovery is metallic replacement. The spent fixing bath is pumped into a
cartridge containing steel wool. An oxidation-reduction reaction occurs and the iron in the wool replaces the
silver in the solution. The silver settles to the bottom of the cartridge as sludge.
To recycle used film, it may be worthwhile to sort the film into "largely black" versus "lar
segments, since the rate of payment for mostly black film may be twice that for mostly clear.
Technologies for reuse of developer and fixer are available and include ozone oxidation, electrolysis,
and ion exchange.
Benefits of Silver Recycling
• Equipment that will suit the needs of even the smallest printing shop is available.
• Reduces the mass of waste entering the wastesteam.
• Allows the fixing bath to be reused.
• The recovered silver is worth approximately 80% of the commodity price.
Limitations of Silver Recycling
• For economic reasons, film should be separated into "mostly black" versus "mostly clear."
5.11 Waste Water Treatment
Water is an indispensable part of almost all industrial activities and in most cases becomes
contaminated during the process. Many industrial plants have pre-treatment processes for wastewater to
reduce the quantities or toxicity of pollutants in the wastewater. In most cases this is required when the
publicly-owned treatment works (POTW) is not equipped to hand the contaminants in a particular facilities
wastewater.
The POTW must process wastewater from a variety of sources including communities, industrial
processes, commercial usage (office buildings and small businesses) and storm and ground water.
Wastewater is 99.94 percent water with the remainder being contaminates in the form of dissolved or
suspended solids. The suspended matter is often referred to as "suspended solids" to differentiate it from
pollutants in solution. "Sewage" usually connotes human waste, but the term also includes everything else
that makes its way from homes to sewers, coming from drains, bathtubs, sinks, and washing machines. There
are basically three types of sewage systems that convey wastewater:
• Sanitary Sewer System - A system that carries liquid and water carried wastes from residences,
commercial buildings, industrial plants, and institutions, together with minor quantities of ground,
storm, and surface wastes that are not admitted intentionally.
• Storm Sewer System - A system that carries stormwater and surface water, street wash and other
wash waters, or drainage, but exclude domestic wastewater and industrial wastes.
188 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Industrial Operations: Waste Water Treatment
• Combined Sewer System - A system intended to receive both sanitary wastewater and storm or
surface water.
This section briefly discusses wastewater pretreatment.
5.11.1 Process Description
Wastewater is generated in many of the operations discussed earlier in this chapter. Many of these
facilities will be required to pretreat their wastewater prior to discharge to the sanitary sewer. Pretreatment
of wastewater usually involves flocculation, pH adjustment, settling to remove solids. Sometimes
flocculation can be achieved through pH adjustment or other chemicals may be added to facilitate
precipitation of dissolved contaminants. Other types of treatment systems are available depending on the
contaminants and contamination level. The extent to which a facility may have to treat wastewater depends
on the contamination levels in the water.
The wastewater components of major concern are those which will: 1) deplete the oxygen
resources of the stream or reservoir to which they are discharged, 2) support undesirable growth of
organisms or fauna in receiving waters, or 3) those with health adverse effects, or even just esthetic impact
(foul odor, discoloration etc.). The major pollutants are made up of both organic and inorganic matter.
The organic compounds are normally composed of a combination of carbon, hydrogen, oxygen
and, in some cases, nitrogen. There could be other elements as well, such as sulfur, phosphorus and iron.
The principal groups found in wastewater are proteins (40-60%), carbohydrates (25-50%) and fats and oils
(about 10%). Inorganic compounds are sulfates, chlorides, phosphorus and heavy metals. Some elements
of both groups are present as suspended matter. A substantial portion of organic matter is biodegradable,
those which serve as food sources for bacteria and other microorganisms. The biological breakdown of
these materials consumes oxygen. The amount of oxy gen required to stabilize the biodegradable organics is
measured in biochemical oxygen demand (BOD). This parameter is used to size treatment facilities and in
predicting the effects of treated wastewater discharges on receiving waters. The chemical oxygen demand
(COD) test is used to measure quantities of nonbiodegradable organics, such as pesticides. Inorganic salts
containing calcium, magnesium, sodium, potassium, chlorides, sulfates and phosphates are other pollutants
which may be contained in the waste streams. These dissolved organic and inorganic pollutants are referred
to as total dissolved solids (TDS).
There are three major categories for wastewater treatment:
• Primary treatment
• Secondary treatment
• Advanced wastewater treatment
Primary treatment removes from the wastewater those pollutants that will either settle out or float.
First the water flows through a screen that removes large floating objects. After screening the water passes
into a grit chamber, where sand, grit, cinders, and small stones are allowed to settle to the bottom. The grit
or gravel is then removed. At that point the water still contains suspended solids that can be removed in
settling tanks. Floating material is skimmed from the surface.
Some of the types of the secondary treatments are discussed below.
5.11.1.1 Trickling Filters
A trickling filter consists of a bed of coarse material, such as stones, plastic grids or slats, over
which the wastewater is sprinkled. As the wastewater trickles through the bed, microbial growth occurs on
the surface of the filter. This method provides the necessary contact between the wastewater and the
microbial population. This process is illustrated in Exhibit 5.14 below.
5.11.1.2 Oxidation
Oxidation ponds are large shallow ponds (lagoons) designed to treat wastewater through the
interaction of sunlight, wind, algae, and oxygen. The lagoons (ponds) are one of the most used secondary
treatment systems. The raw wastewater enters the pond at a single point in the middle of the lagoon or at
one edge. The water is between 2-4 feet deep; deep enough to prevent weed growths but not deep enough to
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 189
Notes
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Industrial Operations: Waste Water Treatment
Notes
prevent mixing by the wind. Shallow ponds are usually aerobic; meaning that oxygen is present, throughout;
only a layer of sludge on the bottom being anaerobic. Algae grow by taking energy from the sunlight and
consuming the carbon dioxide and inorganic compounds released by the action of the bacteria in the pond.
The algae, in turn, release oxygen needed by the bacteria to supplement the oxygen introduced into the lagoon
by the wind action. The most critical factor is to insure that enough oxygen will be present to maintain
aerobic conditions. Otherwise odor problems can be bothersome. The sludge from the bottom has to be
periodically removed by dredging. Advantages of oxidation ponds are easy construction, simple operation
and maintenance. Among disadvantages are large space requirements and frequent removal of algae from the
effluent.
Exhibit 5.14: One and Two Stage Trickling Filter Systems
Influent-
Primary
clarifier
1
'*
Filter
h.
Clarifier
^Effluent
Influent-
Primary
clarifier
'*.
First stage
filter
^
r
Second stage
filter
h.
Clarifier
<• Effluent
5.11.1.3 Activated Sludge
The activated sludge process is a biological wastewater treatment technique in which a mixture of
wastewater and biological sludge (microorganisms) is agitated and aerated. The biological solids are
separated from the treated wastewater and returned to the aeration process as needed. The activated sludge
derives from the biological mass formed when air is continuously injected into the wastewater. Under such
conditions, microorganisms are mixed thoroughly with the organics under conditions that stimulate their
growth through use of the organics as food. As the microorganisms grow and are mixed by the agitation of
the air, the individual organisms clump together (flocculate) to form an active mass of microbes called
"activated sludge." In practice, the wastewater flows continuously into an aeration tank where air is injected
to mix the activated sludge with the wastewater and to supply the oxygen needed for the microbes to break
down the organics. Advantages include the fact that the process is versatile because the design can be
tailored to handle a wide variety of raw wastewater compositions and to meet a variety of effluent standards.
The process is capable of producing a higher quality effluent than the trickling filter process. The
disadvantage is a necessity of a careful operation.
5.11.1.4 Chlorination and Other Disinfection Techniques
Disinfection is the killing of pathogenic bacteria and viruses found in the wastewater. Disinfection
is the last step of the secondary treatment. The most commonly used method is some form of chlorination
during which the chlorine is injected into the wastewater by automated feeding systems. The wastewater then
flows into a basin, where it is held for approximately thirty minutes to allow the chlorine to react with the
pathogens.
An alternative to chlorine is ozone or usage of UV light. These methods are not as widely used as
chlorine because they do not have the residual effect of chlorine.
190
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Industrial Operations: Waste Water Treatment
5.11.2 Waste Description
There are two wastes produced from wastewater treatment operations: water and sludge. The
water is discharged to the sanitary sewer if it meets discharge permit limits. The sludge is disposed of as
either hazardous or non-hazardous waste depending on the plant operations and constituents in the sludge.
5.11.3 Pollution Prevention Opportunities
Pollution prevention opportunities for wastewater treatment processes are classified according to
the waste management hierarchy in order of relevance; first, source reduction techniques, then secondly, (in-
process) recycling options.
5.11.3.1 Source Reduction
There are many source reduction opportunities for wastewater as discussed in earlier sections of
this chapter.
5.11.3.2 Recycling
Recycling and reuse opportunities exist both on and off-site for facilities. Recycling and reuse
have innumerable benefits both financially and environmentally.
In some cases it is possible to recycle water before it reaches the wastewater treatment process the
assessment team should review sources of wastewater carefully to evaluate possible opportunities for reuse
of water in process. Other times it may be possible to reuse a portion of treated wastewater in less critical
plant operations or to reclaim contaminants from the wastewater. For example, it may be possible to
process waters containing high concentrations of metal through an electrolytic recovery unit (or other
equipment of similar function) to reclaim the metals in the water for later reuse or recycling.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 191
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Industrial Operations: Waste Water Treatment
,r REFERENCES
Notes
1. Guide to Cleaner Technologies, Cleaning and Degreasing Process Changes'. 1994; U.S.
Environmental Protection Agency. Office of Research and Development, Washington DC 20460.
EPA/625/R-93/017
2. Guide to Cleaner Technologies, Alternatives to Chlorinated Solvents for Cleaning and Degreasing:
1994; U.S. Environmental Protection Agency. Office of Research and Development, Washington DC
20460. EPA/625/R-93/016.
3. Callahan and Green; Hazardous Solvent Source Reduction: 1995; McGraw-Hill, New York, 10020;
ISBN 0-07-009749-6.
4. Manual: Pollution Prevention in the Paints and Coatings Industry. 1996; U.S. Environmental
Protection Agency. Office of Research and Development, Washington, DC 20460. EPA/625/R-
96/003.
5. International Waste Minimization Approaches and Policies to Metal Plating. 1996;U.S. Environmental
Protection Agency. Office of Solid Waste, Waste Minimization Branch, Washington, DC 20406.
EPA/530/R-96/008
6. Guide to Cleaner Technologies, Alternative Finishes: 1994; U.S. Environmental Protection Agency.
Office of Research and Development, Washington, DC 20406. EPA/625/R-94/007.
7. Freeman, Harry M., Industrial Pollution Prevention Handbook, 1995; McGraw-Hill, New York,
NY 10020; ISBN 0-07-022148-0.
8. Joint Services Pollution Prevention Handbook, "Paint Stripper, Hot Tank," Revision: 8/96; Internet
address: Http://enviro.nfesc.namy .mil/p21ibrary/8-27_896.html
9. Joint Services Pollution Prevention Handbook, "Paint Stripping Using Wheat Starch Blasting,"
Revision: 8/96; Internet address: Http://enviro.nfesc.namy .mil/p21ibrary/5-07_896.html
10. Joint Services Pollution Prevention Handbook, 'Degreasing and Paint Stripping Using Sponge
Blasting," Revision: 7/96; Internet address: Http://enviro.nfesc.namy .mil/p21ibrary/5-06_796.html
11. Joint Services Pollution Prevention Handbook, "High and Medium Pressure Water Paint Stripping
8/96; Internet address: Http://enviro.nfesc.namy.mil/p21ibrary/5-02_896.html
12. Joint Services Pollution Prevention Handbook, "Paint Stripping Using Sodium Bicarbonate Medium,"
Revision: 8/96; Internet address: Http://enviro.nfesc.namy .mil/p21ibrary/5-02_896.html
13. 12th Annual Aerospace Industry, Hazardous Materials Management Conference, "FLASHJET Paint
Stripping Effects on Material Properties", Conference Proceedings from August 1997, Technology
Group 2.
14. Joint Depot Maintenance Analysis Group Technology Assessment Division, Joint Paint Removal
Study: Final Report Laser, October 1996
15. Joint Services Pollution Prevention Handbook, "Carbon Dioxide Blasting Operations," Revision:
9/96; Internet address: Http://enviro.nfesc.namy.mil/p21ibrary/5-02_896.html
16. USEPA Office of Research and Development, "Manual: Pollution Prevention in the Paints and
Coatings Industry," September 1996, pg. 146.
17. McGuinn, Young, and Louis Theodore. Pollution Prevention. Van Nostrand Reinhold Press, NY,
NY; 1992.
18. Guides to Pollution Prevention: The Commercial Printing Industry: 1990; U.S. Environmental
Protection Agency. Office of Research and Development, Washington, DC 204060. EPA/625/7-
90/008.
19. Guides to Pollution Prevention: The Fabricated Metal Products Industry: 1990; U.S. Environmental
Protection Agency. Office of Research and Development, Washington, DC 20460. EPA/625/7-90/006.
192 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Electric Equipment: Motors
CHAPTER 6. ELECTRIC EQUIPMENT
This chapter discusses the electric motors, lighting and associate equipment. A description of each
type of equipment, its general uses, operation, and common opportunities for energy conservation are
presented.
6.1 Motors
Motors represent the largest single use of electricity in most industrial facilities. The function of an
electric motor is to convert electrical energy into mechanical energy. In a typical three-phase AC motor,
current passes through the motor windings and creates a rotating magnetic field. The magnetic field in turn
causes the motor shaft to turn. Motors are designed to perform this function efficiently; the opportunity for
savings with motors rests primarily in their selection and use.
6.1.1 Idle Running
The most direct power savings can be obtained by shutting off idling motors, thereby eliminating
no-load losses. While the approach is simple, in practice it calls for constant supervision or automatic
control. Often, no-load power consumption is considered unimportant. However, the idle no-load current is
frequently about the same as the full-load current.
An example of this type of loss in textile mills occurs with sewing machine motors that are
generally operated for only brief periods. Although these motors are relatively small (1/3 horsepower),
several hundred may be in use at a plant. If we assume 200 motors of 1/3 horsepower are idling 90 percent
of the time at 80 percent of full-load ratings:
Cost of idling per year = 200 motors x 1/3 hp x 80% of load x 6,000 hrs/yr. x 90% idling x $0.041/hp-hr
= $11,800
A switch connected to the pedal can provide automatic shutoff.
6.1.2 Efficiency at Low Load
When a motor has a greater rating than the unit it is driving requires, the motor operates at only
partial load. In this state, the efficiency of the motor is reduced as illustrated in Exhibit 6.1. The use of
oversized motors is fairly common because of the following conditions:
• Personnel may not know the actual load; and, to be conservative, select a motor larger than
necessary.
• The designer or supplier wants to ensure his unit will have ample power; so he suggests a driver
that is substantially larger than the real requirements. The maximum load is rarely developed in
real service. Furthermore, most integral horsepower motors can be safely operated above the full-
load rating for short periods. (This problem may be magnified if there are several intermediaries.)
• When a replacement is needed and a motor with the correct rating is not available, personnel install
the next larger motor. Rather than replace the motor when one with the correct rating becomes
available, the oversized unit continues in use.
• A larger motor is selected for some unexpected increase in driven equipment load that has not
materialized.
• Process requirements have been reduced.
• For some loads, the starting or breakaway torque requirement is substantially greater than the
running torque; thus, oversizing of the motor is a frequent consequence, with penalties in the
running operation.
Plant personnel should be sure none of the above procedures are contributing to the use of
oversized motors and resulting in inefficient operation.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 193
Notes
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Notes
Electric Equipment: Motors
Replacement of underloaded motors with smaller motors will allow a fully loaded smaller motor to
operate at a higher efficiency. This arrangement is generally most economical for larger motors, and only
when they are operating at less than one-third to one-half capacity, depending on their size.
The identification of oversized motors will require taking electric measurements for particular pieces
of equipment. The recording wattmeter is the most useful instrument for this purpose to analyze the load over
a representative period of time.
Another approach that provides an instantaneous reading is to measure the actual speed and compare
it with the nameplate speed. The fractional load, as a percent of full nameplate load, can be determined by
dividing the operating slip by the full-load slip. The relationship between load and slip is nearly linear. Other
motors at the facility can often be used as replacements, reducing or eliminating the investment required for
new motors. Adapter plates and couplings to accommodate the smaller motors would be the major expense.
Scheduling the changes to coincide with maintenance of the motors minimizes the installation costs.
Exhibit 6.1: Motor Efficiency
(Typical T-Frame, NEMA Design B Squirrel Cage Induction Motor -1,800 rpm)
For example, the annual savings for replacing a 50-horsepower motor operating at 25 percent of
rated load with a 15-horsepower motor that will operate near full load is:
LFL=0.746(hp)
1
EffFL-l
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Electric Equipment: Motors
LPL= 0.746 (hp)(PL)\ .
^M PL ~-
where
L = losses - kW
Eff = motor efficiency
subscripts
FL = at full load
PL = at partial load
LFL =0.746(15}— l\ = l.24kW
FL V \0.90 J
LPL =0.746 (50 Yo.25)[— U = l.S2
PL V A \0.837 J
Reduction in Losses = 0.58 kW
Annual Savings = 0.58 kW x 6,000 hrs/yr x $0.05/kWh = $174
6.1.3 High-Efficiency Motors
Whenever possible, all new motor purchases should be high efficiency motors. Payback of the
premium expense of high-efficiency motors is usually less than two years for motors operated for at least
4,000 hours and at 75 percent load. An exception may exist when the motor is only lightly loaded or
operating hours are low, as with intermittent loads. The greatest potential occurs in the 1 to 20 horsepower
range. Above 20 horsepower the efficiency gains become smaller, and existing motors over 200 horsepower
are already relatively efficient.
When an equipment manufacturer supplies motors, high-efficiency motors should be specified at
the time of purchase. Otherwise, manufacturers normally supply motors of standard design because of their
lower cost. Because of competitive pressure, these types of motors are likely to be less efficient. They have
a lower power factor, not possible to spare, and they are more difficult to rewind.
Higher-motor efficiency is obtained in the high efficiency motors through the:
• Use of thinner steel laminations in the stators and rotors;
• Use of steel with better electromagnetic properties;
• Addition of more steel; increase of the wire volume in the stator;
• Improved rotor slot design; and
• The use of smaller more efficient fans.
Many of these approaches involve the use of more material, increased material costs, or higher
manufacturing costs, which accounts for the higher first cost. However, the 25 to 30 percent higher initial
cost is offset by lower operating costs. Other benefits of high-efficiency motors include less effect on
performance from variations in voltage phase imbalance, and partial loading.
The calculation of the simple payback for energy-efficient motors can be complex because of the
variables involved. Determination of the operating cost of the motor requires multiplying the amount of
electricity the motor uses by the number of hours the motor is operated and by the user's electrical cost.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 195
Notes
-------
Electric Equipment: Motors
Notes
Each of these factors has its own variables, including changes in production schedules, variations in motor
load, and demand charges. Some of these figures may be difficult to pinpoint.
Even when savings calculations are attempted, they can be subject to error because the actual
efficiency of the particular motor is generally not known. All manufacturers do not use the same test
technique to measure efficiency; as a result, ratings stamped on nameplates may not be comparable. Most
manufacturers in the United States use a "nominal" efficiency that refers to a range of efficiencies into which
a particular motor's efficiency must fall. Statistical techniques are used to determine t
efficiency of a motor with any given nominal efficiency. For example, a nominal efficiency of 90.2 percent
has a minimum efficiency of 88.5 percent.
Many users report adopting high-efficiency motors as standard practice without attempting to justify
the premium except in the case of larger-sized motors. In general, paybacks of approximately one year have
been experienced.
Published ratings vary for specific motors. For instance, a 100-hp, 1,800-rpm, totally enclosed, fan-
cooled motor from one manufacturer has a guaranteed minimum efficiency of 90.2 percent at full load in the
standard line and 94.3 percent in the high-efficiency line. The equivalent size motor of another manufacturer
has the same 90.2 efficiency rating for the standard model, but the high-efficiency model has a guaranteed
minimum efficiency of 91.0 percent. Verification of actual efficiency of a particular motor requires the use of
sophisticated testing equipment.
Because of this variation, the use of the guaranteed minimum efficiency is more conservative in
evaluating savings because all motors should be equal to or higher than the value specified. Exhibit 6.2 and
Exhibit 6.3 compare standard T-frame TEFC motors with high-efficiency motors.
Exhibit 6.2: Typical Efficiency Comparison for 1 800 rpm Motors: General Electric
Horse
power
10
15
20
25
30
40
50
75
100
125
150
200
Standard T-Frame TEFC
Nominal Average
Expected Efficiency
Full
Load
83.0
84.0
86.0
86.0
88.0
88.0
89.0
91.5
92.0
91.5
93.0
93.0
75%
Load
82.0
84.0
87.0
87.0
88.0
88.0
89.0
91.5
92.0
91.5
93.0
93.5
50%
Load
81.0
83.0
87.0
87.0
88.0
87.0
89.0
91.0
91.0
90.0
91.5
93.0
Guaranteed
Minimum
Full-Load Eff
Not
Available
High Efficiency TEFC
Nominal Average
Expected Efficiency
Full
Load
90.2
91.7
93.0
93.0
93.0
93.6
94.1
95.0
95.0
95.0
95.8
95.8
75%
Load
91.0
92.4
93.6
93.6
93.6
94.1
94.1
95.0
95.0
95.0
95.8
95.8
50%
Load
91.0
92.4
93.6
93.0
93.6
93.6
94.1
94.5
95.0
94.1
95.4
95.8
Guaranteed
Minimum
Full-Load Eff
88.9
90.6
92.0
92.0
92.0
92.7
93.3
94.3
94.3
94.3
95.2
95.2
196
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Electric Equipment: Motors
Exhibit 6.3: Typical Efficiency Comparison for 1,800 rpm Motors: Westinghouse
Horse
power
10
15
20
25
30
40
50
75
100
125
Standard T-Frame TEFC
Nominal Average
Expected Efficiency
Full
Load
88.5
88.5
88.5
90.2
90.2
90.2
91.7
91.7
93.0
93.0
75%
Load
87.8
88.2
88.6
89.2
89.9
89.7
91.2
90.8
92.6
92.5
50%
Load
85.2
86.1
87.2
86.7
88.0
87.9
89.5
88.4
91.0
91.0
Guaranteed
Minimum
Full-Load Eff
86.5
86.5
88.5
88.5
88.5
88.5
90.2
90.2
90.7
90.7
High Efficiency TEFC
Nominal Average
Expected Efficiency
Full
Load
90.2
91.7
91.7
93.0
93.0
93.0
94.1
94.1
95.0
95.0
75%
Load
90.4
91.9
91.9
93.3
93.3
92.6
93.7
93.8
94.8
94.6
50%
Load
89.3
91.0
90.9
92.8
92.8
91.0
92.4
92.6
93.8
93.5
Guaranteed
Minimum
Full-Load Eff
88.5
90.2
90.2
91.7
91.7
91.7
93.0
93.0
94.1
94.1
6.1.4 Reduce Speed/Variable Drives
When equipment can be operated at reduced speeds, a number of options are available. The
examples discussed below are representative for all industries.
6.1.4.1 Variable Frequency AC Motors
When centrifugal pumps, compressors, fans, and blowers are operated at constant speed and output
is controlled with throttled valves or dampers, the motor operates at close to full load all the time-regardless
of the delivered output. These closed dampers and valves dissipate substantial energy. Significant energy
savings can be realized if the driven unit is operated at only the speed necessary to satisfy the demand.
Variable speed drives permit optimum operation of equipment by closely matching the desired system
requirements.
Variable-frequency AC controllers are complex devices, and until recently have been expensive.
However, they work with standard AC induction motors, that allows them to be easily added to an existing
drive. With lower equipment cost and increased electric costs, they become cost effective in many
applications. Many types of pumps (centrifugal, positive displacement, screw, etc.) and fans (air cooler,
cooling-tower, heating and ventilating, etc.), as well as mixers, conveyors, dryers, colanders, crushers,
grinders, certain types of compressors and blowers, agitators, and extruders, are driven at varying speeds by
adjustable-speed drives.
This example illustrates the energy savings for an adjustable-speed drive on a fan. Exhibit 6.4
shows a fan curve for pressure versus flow characteristics. The intersection of the fan and system curve at
point A shows the natural operating point for the system without flow control.
If a damper is used to control the flow, the new operating point becomes point. However, if flow
control is done by fan speed, the new operating point at reduced speed becomes point C. The respective
horsepowers are shown on the horsepower curves as points B' and C'.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
197
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Electric Equipment: Motors
Notes
Exhibit 6.4: Fan Drive: Variable Speed vs. Valve Control
Determination of the energy savings requires calculating the horsepower based on the fan curve and
the duty cycle at which the fan is operating. As shown in Exhibit 6.5, the results for a fan controlled by
damper are assumed to be as follows:
Exhibit 6.5: Results for a Fan Controlled by Damper
CFM% Fanhp Duty Cycle Weighted hp
100
80
60
40
35
35
31
27
10
40
40
10
3.5
14.0
12.4
2.7
Total
32.6
For machines that have a free discharge, the fan affinity formula below is used to calculate the
reduced horsepower for a variable speed drive.
For example, the horsepower for a fan operated at one half speed is:
hpl -' "" ' =12.5%offuUload
198
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Electric Equipment: Motors
Consequently, significant savings are possible when speeds can be reduced. The new fan
horsepower with variable speed is show in Exhibit 6.6.
Exhibit 6.6: Fan Horsepower with Variable Speed Motor
CDM% Fanhp Duty Cycle Weighted hp
100
80
60
40
35
18
7.56
2.24
10
40
40
10
3.5
7.5
3.024
0.224
Total 13.948
The variable speed drive requires less than half the energy of the outlet damper for this particular
duty cycle.
The annual savings (AS) is:
AS = (32.6 hp -13.948 hp) x 6,000 hrs x $0.041/hp-hr = $4,590/yr
The installed cost of variable drive for a 35-hp motor is approximately $10,000. Equipment costs
per hp decrease significantly with size, starting at about $250/hp for a 75-hp motor.
In actual practice, the efficiency of the motor should be factored in for a more accurate saving
calculation based on kW input. The efficiency of the motor begins to drop significantly below 50 percent of
rated capacity.
The above calculations assume a free discharge. If a static head is present, as in the case of a
pump, the static head changes the system curve so that the affinity laws cannot be used directly to calculate
the horsepower at reduced speed. In this case, precise knowledge of the pump and the system curves is
required. Then detailed analysis with the aid of a computer is advisable.
6.1.4.2 Solid State DC Drives
Similar energy savings can be realized by varying drive speeds of DC motors. Initial cost is greater
than for a variable frequency AC motor drive, particularly in a retrofit situation where the existing AC motor
can be used directly with the electric controller. Brush and commutator maintenance is also a major cost
with DC drives. DC systems are also more sensitive to corrosive and particle-laden atmospheres that are
common in an industrial environment.
Accordingly, AC drives are preferred unless process conditions requires some of the special
characteristics of a DC system such as very accurate speed control, rapid reversal of direction, or constant
torque over rated speed range. Applications include driving of extruders, drawing machines, coalers,
laminators, winders, and other equipment.
Other established techniques for varying the speed of a motor are electromechanical slip devices,
fluid drives, and the wound-rotor motor. These devices control speed by varying the degree of slip between
the drive and the driven element. Because the portion of mechanical energy that does not drive the load is
converted to heat, these devices are less efficient and are used primarily because of special characteristics in
a given application. For example, fluid drives might be used for a crusher because they are characterized by
generally high power capacities, smooth torque transmission, tolerance for shock loads, ability to withstand
periods of stall conditions, inherent safety (totally enclosed with no moving contact), and a tolerance of
abrasive atmospheres.
Because variable frequency and solid state drives alter the operating speed of the prime mover, they
are preferred for energy conservation reasons.
6.1.4.3 Mechanical Drives
Mechanical variable-speed drives are the simplest and least expensive means of varying speed.
This type of adjustable sheaves can be opened or closed axially, thus changing the effective pitch at which
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 199
Notes
-------
Electric Equipment: Motors
JT , the belt contacts the sheaves. The chief advantages of mechanical drives are simplicity, ease of maintenance,
and low cost. Their chief disadvantage is a moderate degree of maintenance and less accurate speed control
(normally 5 percent).
Belt drives are available for low to moderate torque applications over a power range to 100 hp.
Efficiencies of belt drives are 95 percent, and the reduction ratio can be as much as 10:1. Metal chain drives
for high torque applications are also available. These are similar in principle to belt drives, but use metal
belts instead of rubber-fabric belts.
6.1.4.4 Single-Speed Reduction
When a single speed will satisfy the need for speed reduction, less expensive options are available.
Although variable speed offers the advantage of using optimum speed in all situations, if the speed range is
narrow and the portion of time operated at the lower speeds is small, a slower single speed is probably the
most cost-effective approach. These inexpensive options include changes in belt drives, installation of gear
reducers, and installation of slower speed motors.
With a belt drive, a speed reduction can be accomplished at minimum expense by simply changing
belt sheaves. Since the change can be conveniently reversed by reinstalling the old sheaves, this method has
application when a reduced output is needed only for an extended period, such as seasonally. Another
opportunity may exist when production levels are reduced for an indefinite time, but the original capacity
may be required again in the future. A similar approach may be taken with a gear change where gear
reducers are used.
When a one-time speed reduction is needed, a slower-speed motor can be substituted. This is a more
long term option as it requires a complete equipment substitute.
6.1.4.5 Two-Speed Motors
A two-speed motor is an economical compromise between a fixed single-speed and a variable drive.
As illustrated in the previous example, energy savings are agnificant because the power required is
proportional to the cube of the speed (rpm). In practice, a slight increase may result from friction losses.
This approach can be used in combination with some throttling to control output within a narrower range.
Two speeds can be obtained with a single winding, but the slower speed must be one-half of the
higher. For example, motor speeds might be 1,800/900, 1,200/600, or 3,600/1,800. When a motor at other
ratios is required, two sets of stator windings are necessary. Multi-speed squirrel-cage motors can also be
obtained which have three or four synchronous speeds.
The cost of two-speed motors is approximately twice the cost of a single-speed motor. If a motor
needs to be operated at the slower speed for any appreciable time, the savings will easily justify the added
investment. Multi-speed motors also need more expensive starters because the overload protectors must be
sized differently at each speed.
6.1.5 Load Reduction
A reduction in motor load is one of the best means of reducing electricity costs. Proper maintenance
of equipment will also reduce motor load by eliminating friction losses from such sources as the
misalignment of equipment, frozen bearings, and belt drag. Proper lubrication of all moving parts such as
bearings and chain drives will minimize friction losses. The substitution of ball or roller bearings for plain
bearings, particularly on line shafts, is another good power saver.
6.1.6 High-Starting Torque
Loads requiring "normal" starting torque can be satisfied by a National Electrical Manufacturers
Association (NEMA) B motor (the general-purpose motor most commonly used in trial plants) or a NEMA A
motor. Where high-inertia loads are involved, selection of a motor specifically designed for high-torque
capability can permit use of a smaller motor. A NEMA B motor sized to handle high-starting loads will
operate at less-than-rated capacity once the load has been accelerated to full speed. On the other hand,
selection of a smaller motor of NEMA C or D design can provide the same starting torque as a NEMA B
motor but will operate closer to the full-rated load under normal running conditions.
200 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Electric Equipment: Motors
6.1.7 Rewound Motors
Rewinding can reduce motor efficiency, depending on the capability of the rewinding shop. Shops
do not necessarily use the best rewind procedure to maintain initial performance. In some cases the lost
inefficiency, particularly with smaller-sized motors, may not justify rewinding.
Ideally, a comparison should be made of the efficiency before and after a rewinding. A relatively
simple procedure for evaluating rewind quality is to keep a log of no-load input current for each motor in the
population. This figure will increase with poor quality rewinds. A review of the rewind shop's procedure
should also provide some indication of the quality of work. Some of the precautions that must be taken
when selecting a facility to rewind motors are as follows.
• When stripping to rewind a motor, unless the insulation burnout is performed in temperature-
controlled ovens or inorganic lamination insulation has been used, the insulation between
laminations may break down and increase the eddy current losses.
• Roasting the old winding at an uncontrolled temperature or using a hand-held torch to soften
varnish for easier coil removal should signal the need to go elsewhere.
• If the core loss is increased as a result of improper burnout, the motor will operate at a higher
temperature and possible fail prematurely.
• If the stator turns are reduced, the stator core loss will increase. These losses are a result of leakage
(harmonic) flux induced by load current and vary as the square of the load current.
• When rewinding a motor, if smaller diameter wire is used, the resistance and the I 2 R losses will
increase.
A rewinding method developed by Wanlass Motor Corporation claims to increase efficiencies as
much as 10 percent. The firm's technique involves replacing the winding in the core with two windings
designed to vary motor speed according to load. Claims of improved efficiency have been disputed and
tradeoffs have been determined to exist in other features of motor design (cost, starting torque, service life,
etc.). While the Wanlass motor has been in existence for over a decade, potential users should recognize
that the design remains controversial and has been generally regarded in the motor industry as offering no
improvement over that which can be achieved through conventional winding and motor design techniques.
6.1.8 Motor Generator Sets
Solid-state rectifiers are a preferred source of direct current for DC motors or other DC uses.
Motor-generator sets, which have been commonly used for direct current, are decidedly less efficient than
solid-state rectifiers. Motor-generator sets have efficiencies of about 70 percent at full load, as opposed to
around 96 percent for a solid-state rectifier at full load. When the sets are underloaded, the efficiency is
considerably lower because efficiency is the product of the generator and motor efficiencies.
6.1.9 Belts
Closely associated with motor efficiency is the energy efficiency of V-belt drives. Several factors
affecting V-belt efficiency are:
• Overbelting: A drive designed years ago should be reexamined to determine belt ratings. Higher-
rated belts can result in an increase in efficiency.
• Tension: Improper tension can cause efficiency losses of up to 10 percent. The best tension for a
V-belt is the lowest tension at which the belt will not slip under a full load.
• Friction: Unnecessary frictional losses will result from misalignment, worn sheaves, poor
ventilation, or rubbing of belts against the guard.
• Sheave diameter: While a sheave change may not be possible, in general, the larger the sheave, the
greater the drive efficiency.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 201
Notes
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Electric Equipment: Motors
Notes
Substitution of the notched Vbelt (cog belt) for the conventional V-belt offers attractive energy
savings. The V-belt is subjected to large compression stresses when conforming to the sheave diameter. The
notched V-belt has less material in the compression section of the belt, thereby minimizing rubber
deformation and compression stresses. The result is higher operating efficiency for the notched V-belt.
Given a 60-hp motor, annual operating cost (6,000 hrs) is $18,000. A conservative 1 percent
improvement in efficiency results in annual savings of $180. The premium cost for six, size 128 belts is $78.
6.2 Lighting
Many lighting systems that represented good practice several years ago are inefficient in view of
today's higher electrical costs and new technologies. A lighting conservation program not only saves energy
but is also a highly visible indication of management's interest in conserving energy in general. The
importance of lighting conservation, therefore, should be considered not only for its dollar savings but also
for its psychological effect on the facility's entire conservation program.
6.2.1 Lighting Standards
The first step in any lighting conservation program is to adopt a lighting standard. A new standard
issued by the Illuminating Engineering Society provides for a range of illuminance instead of a single value.
Within the recommended range, the level of illuminance can vary depending on the age of the workers, the
importance of speed and accuracy, and the reflectance of the task background. DuPont's recommended
illumination levels for various working conditions are shown in Exhibits 6.7 - 6.9. The illumination level
specified is to be provided on the work surface, whether this be horizontal, vertical, or oblique. When there is
no definite work area, it is assumed that the illumination is measured on a horizontal plane, 30 inches above
the floor.
Management should adopt these or similar lighting standards to ensure uniform application
of lighting levels. Without a standard, reductions in lighting are often inconsistent and may result in
insufficient illumination in some areas.
Exhibit 6.7: Dupont Recommended Light Levels for Service Building Interiors
Area
Offices
Private
Small
General
General
Stenographic
Drafting rooms
Files
Active
Inactive
Mail room
Sorting
General
Conference rooms
Corridors and stairways
Footcandles*
in Service
70
70
70
70
100
125
30
10
50
30
70
20
Area
Machine and millwright shops
Rough bench and machine
work
Medium bench and machine
work and tool maker's shop
Fine bench and machine work
Extra fine bench and machine
work
Paint shops
Ordinary hand painting,
rubbing, and finishing
Fine finishing
Spray painting booth
Sheet metal shops
Ordinary bench work
Layout bench
Machines — presses, shears,
stamping, etc.
Footcandles*
in Service
50
100
200**
500**
30
70
30
30
70
50
202
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Electric Equipment: Lighting
Exhibit 6.7: Dupont Recommended Light Levels for Service Building Interiors (Cont.)
Area
Toilets and washrooms
Restrooms
Janitor's closets
Lunch areas
Main entrances
Patios
Doorways and foyers
Lobbies
Interview rooms
Exits, at floor
Medical and first aid
Reception
First aid rooms
Doctor's offices
Nurse's off ices
Dressing rooms
Cot rooms
Telephone equipment
Switchboards
Terminal and rack equipment
Blue print room
Locker and shower and wash
rooms
Mechanical equipment operating
areas (fan rooms, etc.)
Electrical equipment operating
areas (motors, etc.)
Inactive storage
Loading docks and ramps
Store and stock rooms
General — live storage
Rough bulky material
Bin area used for dispensing
Small stock items
Footcandles*
in Service
20
10
10
30
5
20
30
50
5
50
125
70
70
20
20
50
50
50
20
20
20
5
10
20
10
50
Area
Welding shops
General illumination
Precision manual arc welding
Carpenter and wood working
Rough sawing and bench
work
Medium machine and bench
work
Fine bench and machine work
Electrical shops (maintenance)
General
Bench work — general
Insulating coil winding
Testing
Instrument shops (maintenance)
General
Bench work
Pipe shops
General (bending, etc.)
Cutting and threading
Laboratories — hoods, benches,
and desks
Research
Control
Power and steam plants —
General
Front of panels (vertical at 66
inches above floor)
Centralized control room
Ordinary and boiler control
boards
Bench boards (horizontal)
Boiler room — main floor and
basement
Gauge boards — front of panel
(vertical)
Crusher house
Coal conveyors and ash
handling equipment
Condensers, deaerators, and
evaporators
Footcandles*
in Service
50
1,000**
30
50
100
30
70
100
70
50
100
20
30
70
50
50
40
30
50
20
30
10
5
10
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
203
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Electric Equipment: Lighting
Notes
Exhibit 6.7: Dupont Recommended Light Levels for Service Building Interiors (Cont.)
Area
Tool cribs
Gate houses
Pedestrian entrance
Car entrance
Solvent storage and dispensing
Storage in drums
Dispensing
Cylinder sheds
Footcandles*
in Service
30
20
5
5
10
10
Area
Auxiliaries, boiler feed pumps,
tanks, compressors, power
switchgear, battery rooms,
screen house, intake well,
transformer rooms, etc.
Catwalks
Water-treating area
Refrigeration compressors, air
compressors, etc.
Pump houses
Warehouses— general traffic area
Warehouses (in storage aisle at
floor level)
Footcandles*
in Service
20
3
20
20
20
5
15
* The illumination level in any area should be increased so that it is not less than 1/5 the level in any
adjacent area.
** Obtained with a combination of general lighting and specialized supplementary lighting.
Exhibit 6.8: Dupont Recommended Illumination Levels for General Manufacturing
Area
Hand furnaces, boiling tanks,
stationary dryers, stationary and
gravity crystallizers, etc.
Mechanical furnaces, generators
and stills, mechanical dryers,
evaporators, filtration
mechanical crystallizers
Tanks for extractors, cooking
nitrators, percolators, electrolytic
cells
Tank and vat porthole lights, etc.
Light interiors
Dark interiors
Beaters, ball mills, grinders
Mechanical operating equipment
(compressors, fans, pumps, etc.)
Footcandles
in Service
20
30
30
20
70
30
20
Area
Electric operating equipment
(motors, general controls, etc.
Electrical control rooms where
equipment requires frequent
checking, adjustment, etc.
Weight scales, gauges,
thermometers, rotamers, etc.
(Vertical on face of dials, etc.)
Control laboratories
Outdoor platform and tank farms
Active areas
Inactive areas
Stairs, ladders, and steps
Footcandles
in Service
20
30
30
50
5
0.5
3
* Operating personnel do not perform exacting visual tasks except at process control panels, scales, gauges,
etc. Necessary lighting is obtained with combination of general lighting plus supplementary lighting.
204
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Electric Equipment: Lighting
Exhibit 6.9: Dupont Recommended Illumination Levels for Outdoor Areas*
Area
Bulletin and poster boards
Flood lighting-building exteriors
Entrances
Active (pedestrian or
conveyance or both)
Inactive (normally locked,
infrequently used)
Loading and unloading
platforms
Protective lighting
Boundaries and fence
Vital locations or structures
Building surroundings
General inactive area
Footcandles*
in Service
10-V
15-V(max)
5
0.5
o
J
0.2
5
1
0.1
Area
Railroad yards
Roadways
Curves and intersections
Platforms, catwalks, stairs,
ladders, etc.
Platform operating decks
Catwalks, stairs, and ladders
Plant parking lots
General parking areas
Entrances, exits, and
walkways
Gasoline dispensing pumps
Outdoor work areas
Footcandles*
in Service
0.2
0.5
5
3
0.3
2
3
3
* As a matter of reference in comparing outdoor lighting values, the intensity of full moonlight a the
earth's surface is approximately 0.025 footcandles.
6.2.2 Light Meter Audit
After standards have been adopted, a light meter audit to determine the existing lighting levels
should be conducted for the entire facility. The condition of the lamps and fixtures should be taken into
account when the audit is made. The cleanliness of the fixtures has an important effect on the light output.
Also, some depreciation of light intensity occurs over the life of most lamps. If group relamping has been
used, the lighting level will depend on the age of the lamps. Light loss of 10 to 15 percent is normal for
standard 40 W fluorescent lamps that are approaching end of life.
6.2.3 Methods to Reduce Costs
Examples of energy conservation are given in the sections below. Some of them are rather simple
and the implementation requires only the will to overcome some old entrenched habits of the people in the
work place.
6.2.3.1 Turn off Lights
The most obvious and beneficial step to conserve energy is to turn off lights when they are not
needed. This approach often requires an extensive publicity program to enlist the support of all employees.
First-line supervisors must understand that conserving light is as much a part of their job responsibility as
improving productivity. An effective way for members of management to show support for energy
conservation is to turn off lights in their own offices when unoccupied.
Frequently, lights can be turned off in storage or operating areas that are not in use or are seldom
occupied during periods of reduced production on the evening or the midnight shift. For example, it is
common practice to leave office lights on until the cleaning crew has completed its work instead of turning
them off as soon as the offices are vacated.
The lighting circuitry may not provide the flexibility needed for a partial curtailment. In this case,
the cost to modify the wiring must be compared with the potential energy savings to determine whether
rewiring is justified.
Fluorescent lamps are commonly left on over noon hours or other short periods because of the
belief that frequent starts will shorten tube life. This problem is substantially reduced now with tubes that
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
205
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Electric Equipment: Lighting
JT , are more tolerant of starts and the increased cost of energy compared with the tube cost. The break-even
point for fluorescent lighting is usually 5 to 15 minutes, depending on the electric rate, lamp cost, and lamp
replacement labor rate. With incandescent lights, however, energy will be saved each time they are turned
off. For high-intensity discharge (HID) lamps, it is usually not practical to turn lights off for brief periods
(less than 30 minutes) because of the long lamp restart time.
6.2.3.2 Automatic Controllers
A technique for ensuring that lights are turned off when the room is unoccupied is to use presence
detectors (infrared, capacitance, or ultrasonic) that detect when the room is unoccupied and will automatically
turn off the lights. One lighting control product uses an ultra-sonic sensor that can handle up to four 20 amp
circuits. This allows control of electrical devices as well as lights. The unit costs about $150 uninstalled.
The presence of people in a room is determined by a sensor that detects interruptions in the ultrasonic sound
waves transmitted by the unit. The sensor then sends a signal to a controller to turn lights on or off. The
sensor has a time-delay knob that can be manually set anywhere from 1 to 12 minutes to ensure that
equipment stays on for a certain period of time after a room is occupied.
For example, annual savings for a unit controlling 5,000 watts of lighting that reduces lighting by
two hours per day, five days per week at $0.05/kWh would be $125.
Another device that is used to avoid leaving lights on needlessly is a microprocessor-based
automatic lighting control. These relatively inexpensive devices can be programmed to turn off lights when
not needed. For example, one programmable controller being offered for about $500 can control up to 50
switches. The user can override the off function by turning on lights at his particular area. This is done with
individual wall switches that cost about $30 per unit installed. When a lighting circuit turns off according to
schedule, the toggle switches are moved to the off position. Switches can also be used alone or with an
existing energy management system. The traditional approach has been to install lighting control systems
separately, but firms are attempting to incorporate lighting systems with an energy management system
because it is more cost effective.
6.2.3.3 Remove Lamps
Another direct method to reduce lighting is simply to remove lamps from service where less light is
needed. This approach frequently applies to offices or areas in which uniform lighting has been provided.
For example, if the fixture is located over an office doorway, lamps can often be removed without reducing
the illumination level at the desktop. In four-lamp fixtures, two of the four lamps can be removed if only a
partial reduction in illumination is possible. Office lighting loads can frequently be reduced 25 percent by
this arrangement.
Excess lighting is also frequently provided in aisles, particularly when natural daylight may be
sufficient. Lighting levels in storage areas are often higher than needed. This situation can develop when
former operating areas are utilized for storage. Removal of lamps from these less-critical areas does not
affect production.
Ballasts in fluorescent fixtures continue to consume current (approximately 10 percent of total load)
after the lamps have been removed. The entire fixture should, therefore, be disconnected if lamps are
removed (except for some lamp systems that have circuit interrupting lamp holders).
6.2.3.4 Maintain Lamps
Dirt and dust accumulations on the fixtures greatly affect lamp efficiencies. Light intensity can
depreciate up to 30 percent by the time lamps are replaced; in extremely dirty conditions, depreciation can be
higher. A minimal cleaning schedule for an average industrial environment is to clean fixtures when the
lamps are replaced. The number of lamps required to provide the desired illumination level will depend on
the plant's maintenance program. Initially, additional lighting to offset the gradual depreciation of light
caused by dirt must be provided. If clean luminaires will improve lighting levels enough to permit the
removal of some lamps, more frequent lamp maintenance may be justified. Cleaning costs must be balanced
with energy costs to determine the optimum cleaning schedule.
In addition, dirty or discolored luminaire diffusers can also reduce light output considerably.
Replacement or complete removal may allow the lighting requirements to be satisfied with fewer lamps.
206 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Electric Equipment: Lighting
6.2.3.5 Lower-Wattage Fluorescent Lamps and Ballasts
A reduction in fluorescent light level by removing lamps from service can result in a spotty effect
that is unattractive or provides an unacceptably low or non-uniform level of illumination. An alternate
approach to energy saving is substitution of lower-wattage fluorescent lamps and ballasts. The substitution
may or may not reduce the lighting level, depending on the type of lamp used. Because the variety of
fluorescent lamps is so extensive, the following discussion refers to the general purpose 4-foot rapid start
lamp, but reduced-wattage lamps are also available in other sizes and types.
a) Standard Lamp: The standard lamp for many years has been the 40-watt cool white, CW (or warm
white, WW) lamp. This is the least expensive lamp, but also the least energy efficient. Several
more cost-effective fluorescent lamp systems are available which use less wattage.
b) Energy Saver (ES) Lamp: A first-generation reduced wattage or energy-saving lamp was
introduced in 1974 in 35-watt ratings (now typically rated at 34 watts). These lamps can be used as
direct replacements for 40-watt lamps in existing luminaires. They emit the same color white light
as the lamps they replace. Energy consumption is reduced by 13 to 15 percent with a comparable
reduction in light output. The conversion to the lower illumination level need not cause personnel
problems because the level of illumination will temporarily increase if the existing system is
relamped as a group and the luminaires are cleaned. The ES lamps cost approximately 40 percent
more than the standard lamps. If the lower lumen output is acceptable, the energy savings results
in an attractive payback.
c) White Lamps: A second generation of reduced-wattage lamps, generically designated as "lite
white", is available when more lumen output is needed than the ES lamp provides. The lite white
lamps consume about the same energy as the ES lamps (34 watts) but with only about 6 percent
reduction in light output. The color of light, however, has a somewhat lower color-rendering index
than that of the cool white lamps. Although lite white color differs from cool white, the lamps are
considered compatible in the same system. These lamps cost about 50 percent more than the
standard lamps.
d) Lite White Deluxe Lamps: If color rendition is important, a third generation of ES lamp, designated
as "lite white deluxe", can be used. This lamp combines the high efficiency of the lite white lamp
with even better color discrimination than the standard lamp. The lite white deluxe costs
approximately three times as much as the standard lamp, but it can still be justified on the basis of
energy saving. For example, a lite white deluxe costs $2.30 more than the standard lamp. Annual
energy savings would be $1.80 (6,000 hrs. @ $0.05/kWh) for a payback of 1.3 years. If conditions
permit use of the lower cost ED or lite white lamp, payback is about four mo nths.
e) Ballasts: Several options are available in the ballasts that can be used with any of the lamps
described above. The standard electromagnetic ballast is the least efficient but also least expensive
type ballast. The luminaire manufacturer normally provides it unless another type is specified. The
standard electromagnetic ballast is not economical in sizes of 34 watts and above.
f) ES Ballasts: A more efficient low-loss or energy-saving electromagnetic ballast is also available.
In evaluating the ballasts, the savings must be considered as a unit with the lamps since the more
efficient ballasts permit the lamps to operate at lower wattage as well. A two 34-watt lamp system
with an ES ballast saves 8 to 10 watts over the same system with a standard ballast. The premium
for the high-efficiency ballast is approximately $6. Annual savings would be about $2.70 (6,000
hrs. @$0.05/kWh).
g) Electronic Ballasts: More energy-saving electronic ballasts can also be used. Electronic ballasts
operate at a frequency of 25 kilohertz (25,000 Hz) compared to the 60 hertz for standard ballasts.
The higher frequency allows the lamps to operate at lower wattage. ES lamps must be used with
rapid start ballasts. Good quality fluorescent luminaires manufactured in recent years are normally
equipped with such ballasts.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 207
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Electric Equipment: Lighting
JT , Initial problems of reliability with the electronic ballasts appear to have been overcome. Electronic
ballasts, however, have many small components and a relatively short product history compared
with the simple construction and long-established high reliability of the magnetic ballasts.
With electronic ballasts, approximately 10 less watts per two 34-watt lamp system are saved over the
same system with an energy efficient ballast. The premium for the electronic ballast over an ES
ballast is about $13. Annual savings would be $3.00 (6,000 hrs @ $0.05/kWh). The payback for the
electronic ballast is about twice as long as that of the energy-saving ballast. Comparative prices for
standard ballast, energy-saving magnetic ballast, and electronic ballast are approximately $16, $22,
and $35, respectively.
h) Performance-Matched Systems: For minimum wattage systems it is necessary to use performance-
matched fluorescent systems in which the lamp and ballast are specifically tailored to each other for
optimum efficiency. Such systems might not operate satisfactorily if other than their designated
companion ballasts and lamps are used. However, performance- matched systems use considerably
less energy (28 watts per lamp) than the conventional 40-watt systems.
The premium necessary for the electronic ballasts with these systems may reduce the payback to
unacceptable levels. However, when four lamps can be operated from one ballast, the economics are more
attractive. Plants should evaluate the high-performance systems based on their electrical rates, conditions,
and payback standards.
Energy-saving lamps are designed to operate closer to the optimum operating temperatures than
conventional lamps and are not suitable for use in ambient temperatures below 60°F. At the lower
temperatures ES lamps may be difficult to start or show sign of instability in operation by flickering.
Accordingly, some low-temperature applications, such as warehouses, may not be suitable for ES lamps.
Below 60°F, standard fluorescent lamps will have a lower light output depending on the draft and
lamp enclosure. Plastic sleeves or other jacketing that can retain heat can improve output when the light
output has been noticeably reduced. However, light output will also start to decrease if above-bulb-wall
temperatures exceed 100°F.
Users of ES lamps have reported some problems with ballast failure. ES lamps cause a slight
increase in voltage across the capacitor, which in turn can cause premature iailure in older ballasts. The
problem, therefore, should be considered temporary until overage ballasts have been replaced.
A general problem to provide a more energy-efficient lighting system in a retrofit situation would be
to replace any 40-watt lamps with one of the 34-watt lamps most suitable to the facility's conditions. This
substitution can be done as individual lamps burn out, or they can be replaced on a group basis. The rapid
payback usually justifies group replacement. More energy-efficient ballasts should also be substituted, but
only as replacements are needed.
When a lower illumination level is acceptable but removal of a lamp would cause a problem of
uneven illumination, a more uniform reduction in light level can be achieved by substituting special lamps.
For example, Sylvania markets two versions of an ES lamp called Thrift/Mate. These lamps are intended to
replace only one of a pair of lamps on the same ballast. When so installed, both the Thrift/Mate and the
conventional lamp operate at reduced wattage. The two versions, designated TM33 and TM50, reduce energy
consumption by 33 and 50 percent, respectively. The reduction in light output of the luminaire is equivalent
to the reduction in power consumption.
Another method is to replace one of the two fluorescent lamps in a two-lamp fixture with a phantom
tube. The phantom tube produces no light itself and the remaining real lamp in the fixture produces only
about 70 percent of its normal illumination. The net result is a saving of two-thirds in the power used, with
an illumination level of about one-third of that normally derived from a two-lamp fixture.
6.2.3.6 Fluorescent Retrofit Reflectors
Specular retrofit reflectors for fluorescent fixtures are available in two basic types: semi-rigid
reflectors, which are secured in the fixtures by mechanical means, and adhesive films, which are applied
directly to the interior surfaces of the fixture. Film applied directly to the existing fixtures is generally less
efficient than the semi-rigid reflectors since it conforms to the fixture contours and cannot be formed to direct
208 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Electric Equipment: Lighting
light in any specific manner. Either silver or aluminum may be used as the reflecting media. On the
average, silver film reflectors have a reflective film index between 94 and 96 percent; the index for
aluminum is 85 to 86 percent.
In regard to the energy aspects of the reflectors, manufacturers claim the reflectors permit the
removal of two lamps from a four-lamp dirty fixture. The illumination directly underneath the fixture is
essentially the same. But at angles to either side of the fixture, the decrease is much more significant. The
fixture has been changed from a diffuse fixture to a sharp cut-off fixture. The additional illumination level
with the reflectors is due in part from enabling the remaining two lamps to operate at a lower temperature,
which increases their light output 6 to 12 percent.
While removal of two lamps reduces energy 50 percent, the comparison is not on an equal basis
and several tradeoffs should be recognized.
• The light pattern is more limited in area. The result can be non-uniform lighting on the work plane,
dark spots between the fixtures, and darkened walls.
• The above claim of equivalent illumination is based on a comparison with a dirty fixture. The
footcandles with two lamps and reflector is only 65 percent as much as four lamps with a clean
conventional fixture.
• Lamp failure in a de-lamped fixture will not have the partial illumination provided by the second
pair of lamps. Consequently, prompt replacement of burned-out lamps becomes more critical.
• The efficiency of any reflector depends on how well it is maintained. Even in a clean office
environment the loss of light output due to dirt buildup in an unmaintained fixture can be as much
as 35 percent. The reflectors may be more difficult to clean than normal fixture surfaces.
• Silver films are relatively new and their durability is somewhat unknown.
• The cost of a reflector often approaches the price paid for a new fixture. Approximate installation
costs for the reflectors range from $35 to $65.
If the above tradeoffs are acceptable, then the energy savings would justify their use. However, if a
one-third reduction in light output is acceptable, a more cost-effective option would be to use the
Thrift/Mate lamps and possibly upgrade the cleaning schedule. The illumination from a clean two-lamp
fixture will be equivalent to the illumination from a dirty two-lamp fixture with the retrofit reflector. Also,
if unequal lighting is acceptable, possibly one-third of the existing fixtures could be removed instead.
6.2.3.7 Lamp Relocation
Poorly arranged light wastes energy. Traditionally, light systems have been designed to provide a
uniform level of light throughout an entire area. However, with the increased cost of electric energy, the
emphasis today is on designing illumination for the type of task and the location where it will be performed.
Non-uniform light is actually more visually pleasing as well as less energy consuming. When the
actual work area is properly lighted, the remaining area requires only a moderate level of general lighting to
provide reasonable visibility and to prevent an excessive brightness imbalance, which can cause visual
discomfort.
Task lighting has a number of advantages:
• High light levels are concentrated only where needed and are matched specifically to the task.
Overall lighting energy usage is thereby reduced.
• Less heat is generated by the lighting system.
• Lighting is usually more easily relocated as operations change.
• Luminaire maintenance and lamp replacement expenses are usually less because they are more
readily accessible.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 209
Notes
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Electric Equipment: Lighting
Notes
• Units are individually controlled, permitting them to be shut off when not needed.
• Lighting effectiveness is improved by permitting the most advantageous positioning. Reflection and
shadows can be avoided.
6.2.3.8 Lighting System Replacement
Existing incandescent or mercury lighting systems are usually candidates for replacement.
Incandescent lighting is suitable for certain applications, but its low efficiency makes it uneconomical for
general illumination. A rapid payback can almost always be shown for replacing mercury with more efficient
light sources, especially with high-pressure sodium.
If a lighting system must be designed to fit a new or modified installation, the alternative systems,
listed with their relative outputs in Exhibit 6.10 should be considered.
High-pressure sodium (HPS) lamps provide the most light per energy input and are the most
economical when their color characteristics are suitable (the decided yellow color of low-pressure sodium
lamps is usually unsatisfactory for most industrial areas). This lamp is offered in a wide choice of wattages,
ranging from a nominal 70 watts to 1,000 watts. Luminaire manufacturers also offer a broad variety of
luminaires suitable for various applications in outdoor lighting, manufacturing, and office lighting.
Exhibit 6.10: Alternative Lighting Systems Approximate
Initial Lumens per Watt Including Ballast
Type of Light
Low Pressure Sodium
High Pressure Sodium
Metal Halide
Fluorescent
Mercury
Incandescent
Smaller
Sizes
90
84
67
66
44
17
Middle
Sizes
120
105
75
74
51
22
Larger
Sizes
150
126
93
70
57
24
HPS lighting has found wide acceptance as warehouse lighting, where color rendition is usually not
critical. The high ceiling height common in warehouses is well suited to HPS lighting. To meet the
challenge of illuminating warehouse aisles, asymmetrical luminaires specifically designed for aisle lighting
are available. Overlap of light between fixtures will be adequate even if the luminaires are as much as three
times as far apart as their mounting height from the floor. HPS luminaires are also available for low
mounting heights. The flexibility of HPS lighting has permitted significant inroads into areas that were
formerly reserved for fluorescent lighting.
For comparable wattage, HPS lamps deliver about 50 percent more lumens than mercury lamps, and
500 percent more than incandescent light sources. Efficiency of most sources increases at higher wattages, so
for maximum economy, the HPS lighting system should be designed to use the largest sized lamps that are
consistent with good lighting practice and controlled brightness.
6.2.4 Summary of Different Lighting Technologies
The potential for energy savings in lighting is twofold: the industry has produced some money (but
not many) and energy saving products primarily because design engineers have specified excessive lighting
levels over the years, and secondly some technological advances have occurred.
210
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Electric Equipment: Lighting
6.2.4.1 Incandescent
The following features can describe incandescent lighting (light produced by heating an element
until it glows).
• Main reason for use is color rendition and dimming, although recently dimming has been made
available for other types of light.
• Reduced wattage / reduced output replacements are now available although no more efficient.
• One type of PAR lamp is now being offered which has an infrared reflective film that makes the
filament hotter and brighter.
6.2.4.2 Fluorescent
Fluorescent lighting can be summed as follows:
• Light is produced by emitting an electronic field, causing the phosphorous to glow (fluoresce).
• More energy efficient.
• Varying levels of color rendering are available depending on the quality of the rare earth
phosphors, and the cost. Color rendering is arbitrary way to compare the color of the light using
sunlight as 100 percent.
• New T8 (one inch diameter) lamps produce light more efficiently than previous lamps, but must be
used with electronic ballasts.
• Compact fluorescent - twin tube, exit signs.
6.2.4.3 High Energy Discharge
The following types of lamps fall under the high energy discharge category:
• Mercury Vapor,
• Metal Halide,
• High Pressure Sodium, and
• Low Pressure Sodium.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 211
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Electric Equipment: Lighting
Notes REFERENCES
1. Coombs, V.T., The Possibility of Energy Saving by the Correct Sizing of Electric Motors,
Electrical Review, pp 744-746, December 1975
2. Levers, W.D., The Electrical Engineer's Challenge in Energy Conservation., IEEE Trans, on
Industrial Applications, 1A-11,4, 1975
3. Cotton, H., Principles of Electrical Technology, Pitman, 1967
4. Henderson, S.T., and Marsden, A.M., Lamps and Lighting, Arnold, 1972
5. Windett, A.S., Reducing the Cost of Electricity Supply, Gower Press, 1973
6. Zackrison, H.B., Energy Conservation Techniques for Engineers, Van Nostrand Reinhold
Company, 1984
7. Lyons, S.L., Management Guide to Modern Industrial Lighting, Applied Science Publishers,
1972
8. Illuminating Engineering Society, IES Lighting Handbook, 1972
212 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Heat: Boilers
CHAPTER 7. HEAT
This chapter discusses sources of heat in industrial operations and associated equipment. A
description of each heat source, its general uses, operation, and common opportunities for energy
conservation are presented. There will be case studies referenced throughout the chapter that can be found in
Appendix E.
7.1 Boilers
A boiler is a device where energy extracted from some type of fuel is converted into heat that is
distributed to needed places to do useful work. In the process, the carrying media (water or steam) gives up
the heat and is cyclically reheated again and again. There are examples where the media (steam) is not
returned, such as locomotives, but in industrial processes covered in this manual it would constitute an
exception. For the most part, boilers take advantage of the phase changes that occur in some substances (for
example water). The phase change is associated with large amount of energy that can be harnessed to our
benefit.
There are four principal boiler categories: (1) natural draft, (2) forced draft, (3) hot water or steam,
and (4) fire tube or water tube. In a natural draft boiler, the combustion air is drawn in by natural convection
and there is no control of the air/fuel ratio. For forced draft boilers, a blower controls the quantities of
combustion air and the air/fuel mixture. Some boilers produce hot water, typically in the 160° to 190°F
range, while others produce steam. Steam boilers may be low pressure (approximately 15 psi), medium
pressure (15 to 150 psi), or high pressure (150 to 500 psi). Finally, boilers may be fire-tube or water-tube
boilers. In a fire-tube boiler, the hot gas flows through tubes immersed in water, whereas in a water-tube
boiler, the water flows through tubes heated by the hot combustion gases. There are also some very high
temperature and superheat boilers but these are seldom encountered in typical manufacturing operations. The
typical boiler used in small to medium sized industrial operations is a forced draft steam boiler at 120-150 psi
and approximately 150 hp. The following measures are also applicable to utility boilers. Other than the
major differences of not being natural draft boilers and producing steam at greater than 150 psi, utility boilers
are similar to boilers commonly used by industry.
This section includes energy conservation strategies for boiler systems. Combustion air blower
variable frequency drives, air/fuel ratio reset, turbulators, high-pressure condensate return systems, steam trap
repair, and steam leak repair are discussed in this section.
7.1.1 Boiler Operation and Efficiency
An ideal model of a boiler operation is based on the Carnot cycle. The Carnot cycle is defined as
two reversible isothermal and two reversible adiabatic processes. Heat is added to the cycle during the
isothermal process at high temperature (Tn ), then follows an adiabatic process producing work as the
working fluid is expanded to a lower pressure. During the next isothermal stage, heat is rejected to the low
temperature reservoir at TL. During the last phase the working fluid is adiabatically compressed to finish the
cycle. The Carnot cycle is the most efficient cycle for the given low and high temperatures and its efficiency
is given by:
The efficiency of a real boiler is always lower. A model Carnot cycle using the phase changing
medium, would be a boiler that operates at constant temperature while adding heat to the working medium,
then an expansion device (turbine) that operates adiabatically, a condenser that operates at constant
temperature while rejecting heat from the medium and a compressor or a pump that adiabatically brings the
medium to the starting point. The boilers are designed to operate at near constant pressure but in reality the
temperature and pressure vary. If the devices are operated near the saturation region, they will operate at
constant temperature as well as constant pressure. The quality of the medium is quite low at the end of
expansion and the fluid before compression is a mixture of liquid and vapor instead of just liquid.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 213
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Heat: Boilers
Notes
7.1.1.1 Boiler Efficiency Tips
Boiler efficiency can be improved and maintained through proper maintenance and monitoring of
operation. The eight tips presented here are guidelines for improving boiler efficiency but are not all
inclusive.
1. Conduct a flue gas analysis on the boiler every two months to test for fuel/air ratio settings and
adjust air/fuel ratio to optimize efficiency. Optimal percentages of Q CC>2, and excess air in the
exhaust gases are shown in Exhibit 7.1.
Exhibit 7.1: Optimal Flue Gas Composition
Fuel
Natural Gas
Liquid Petroleum Fuel
Coal
Wood
02
(%)
2.2
4.0
4.5
5.0
C02
(%)
10.5
12.5
14.5
15.5
Excess Air
(%)
10
20
25
30
The air fuel ratio should be adjusted to the recommended optimum values if possible; however, a
boiler with a wide operating range may require a control system to constantly adjust the air-fuel
ratio.
2. A high flue gas temperature often reflects the existence of deposits and fouling on the fire and/ or
water side(s) of the boiler. The resulting loss in boiler efficiency can be closely estimated on the
basis that a 1% efficiency loss occurs with every 40°F increase in stack temperature.
It is suggested that the stack gas temperature be recorded immediately after boiler servicing
(including tube cleaning) and that this value be used as the optimum reading. Stack gas
temperature readings should be taken on a regular basis and compared with the established
optimum reading at the same firing rate. A major variation in the stack gas temperature indicates a
drop in efficiency and the need for either air-fuel ratio adjustment or boiler tube cleaning. Exhibit
7.2 illustrates how the stack temperature rises with maladjusted air fuel ratios. In the absence of
any reference temperature, it is normally expected that the stack temperature be less than 100°F
above the saturated steam temperature at a high firing rate in a saturated steam boiler (this doesn't
apply to boilers with economizers and air pre-heaters).
3. After an overhaul of the boiler, run the boiler and reexamine the tubes for cleanliness after thirty
days of operation. The accumulated amount of soot will establish the criterion as to the necessary
frequency of boiler tube cleaning.
4. Check the burner head and orifice once a week and clean if necessary.
5. Check all controls frequently and keep them clean and dry.
6. For water tube boilers burning coal or oil, blow the soot out once a day. The National Bureau of
Standards indicates that 8 days of operation can result in an efficiency reduction of as much as 8%,
caused solely by sooting of the boiler tubes.
7. Purity of water used for steam generation is extremely important. It is not usually possible to use
untreated waters found in nature as boiler feed water as there are many impurities. Water must be
treated to remove the impurities or convert them into some harmless form. Other means to remove
impurities and buildup from boilers is a systematic removal by blowdown. This way an excessive
accumulation of solids is prevented. Water treatment prevents the formation of scale and sludge
deposits on the internal surfaces of boilers. Scale formations severely retard the heat flow and
cause overheating of metal parts. The scale build-up and heat transfer relationship is demonstrated
in Exhibit 7.3.
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Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Heat: Boilers
The frequency and amount of blowdown depend upon the amount and condition of the feed-water.
Check the operation of the blowdown system and make sure that excessive blowdown does not
occur. Normally, blowdown should be no more than 1% to 3% of steam output.
Exhibit 7.2: Boiler Efficiency (Natural Gas)
Notes
Excess
Air
0.0
2.2
4.5
6.9
9.5
12.1
15.0
18.0
21.1
24.5
28.1
31.9
35.9
40.3
44.9
49.9
55.3
61.1
67.3
74.2
81.6
89.8
98.7
108.7
119.7
02
%
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
C02%
11.8
11.5
11.2
11.0
10.7
10.4
10.1
9.8
9.6
9.3
9.0
8.7
8.4
8.2
7.9
7.6
7.3
7.0
6.7
6.5
6.2
5.9
5.6
5.3
5.1
Net Stack Temperature
220
85.3
85.2
85.1
85.0
84.9
84.8
84.7
84.6
84.5
84.3
84.2
84.1
83.9
83.7
83.5
83.4
83.1
82.9
82.7
82.4
82.1
81.8
81.5
81.1
80.6
230
85.1
85.0
84.9
84.8
84.7
84.6
84.5
84.4
84.2
84.1
83.9
83.8
83.6
83.4
83.3
83.1
82.8
82.6
82.3
82.1
81.8
81.4
81.1
80.7
80.2
240
84.9
84.8
84.7
84.6
84.5
84.4
84.2
84.1
84.0
83.8
83.7
83.5
83.3
83.2
83.0
82.8
82.5
82.3
82.0
81.7
81.4
81.1
80.7
80.3
79.8
246
84.8
84.7
84.6
84.5
84.3
84.2
84.1
84.0
83.8
83.7
83.5
83.4
83.2
83.0
82.8
82.6
82.3
82.1
81.8
81.5
81.2
80.9
80.5
80.1
79.4
250
84.7
84.6
84.5
84.4
84.2
84.1
84.0
83.9
83.7
83.6
83.4
83.3
83.1
82.9
82.7
82.5
82.2
82.0
81.7
81.4
81.1
80.7
80.3
79.7
79.4
260
84.5
84.4
84.2
84.1
84.0
83.9
83.8
83.6
83.5
83.3
83.2
83.0
82.8
82.6
82.4
82.2
81.9
81.6
81.4
81.0
80.7
80.3
79.9
79.4
78.9
270
84.2
84.1
84.0
83.9
83.8
83.7
83.5
83.4
83.2
83.1
82.9
82.7
82.5
82.3
82.1
81.9
81.6
81.3
81.0
80.7
80.3
79.9
79.5
79.0
78.5
Economizers use heat from moderately low temperature combustion gases after the gases leave the
steam generating section (or in many cases also after going through a superheating segment) to preheat feed
water. Economizers are heating the feed water after it is received from the water feed pumps, so the water
arrives at a higher temperature into a steam generating area. A typical design uses steel tubes where the water
is fed at pressures higher than the pressure in the steam generation part. The feed rate has to correspond to
the steam output of the boiler. Exhibit 7.4 shows the effect of pre-heating of the feed water on the efficiency
of a boiler unit.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
215
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Heat: Boilers
Notes
Exhibit 7.3: Effect of Scale Thickness in Boilers on Heat Transfer
a
o
13
18
TO
a
-------
Heat: Boilers
Although blowdowns are an absolute necessity for the operation of a boiler, it is important that one
realizes that, depending on the pressure, each blowdown decreases the efficiency of the boiler. Exhibit 7.5
illustrates the decrease in efficiency where the percent blowdown is calculated as follows:
M
Blowdown
M
•xlOO
Steam Produced
Note how sharply the efficiency loss increases with higher pressures.
Exhibit 7.5: Efficiency Loss Due to Blowdown
10
9
8
7
6
5
4
3
2
1
(A
I
>»
Q
9
'
™
ULJ
I
0>
ft.
5%
10%
15%
20%
7.1.1.2 Combustion in Boilers
Heat is released through a process called "combustion" (burning). Combustion is a release of heat
energy through the process of oxidation. The methods used to extract heat are comb ustion of carbon based
fuels or heat generated by electric current.
To make the combustion happen a mixture of fuel, oxygen and heat is necessary. During the process
of combustion, elements of fuel mix with oxygen and reconfigure to form new combinations of the same
elements. The result is heat, light and new element combinations. The goal is to maximize heat and that can
happen when the combustion process is tightly controlled.
Complete Combustion:
Carbon
4
Hydrogen
Oxygen
Nitrogen
Water
C02
Nitrogen
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
217
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Heat: Boilers
Notes
Incomplete Combustion:
Carbon
Hydrogen
Oxygen
Nitrogen
Soot + Aldehydes
Water
CO,
CO
Nitrogen
Perfect combustion (referred to as stoichiometric combustion) is the process of burning the fuel
without an excess of combustion air. This process should develop the "ULTIMATE CO2»" (see Exhibit 7.6).
Exhibit 7.6: Ultimate CO2 Values
Fuel
Natural Gas (can vary)
Propane
No.2 Oil
No.4 Oil
C02 %
11.7-12.1%
13.7%
15.2%
16.0%
While these values can be sometimes achieved, Exhibit 7.7: Boiler Combustion Mixtures shows
more realistic desired values.
Exhibit 7.7: Boiler Combustion Mixtures
Fuel
Natural Gas
Propane
C02_
10.5%
115-12.0%
No.2 Oil 115-12.0%
No.4 Oil : 125-13.0%
°^
3.5-4.0%
3.5-4.0%
3.5-4.0%
3.5-4.0%
Excess Air
20%
20%
20%
20%
Carbon, in burning to carbon monoxide, gives off only about one third of the available heat. A one
eighth inch coating of soot on the heat exchanger increases fuel consumption by over 8% as a rule of thumb.
Incomplete combustion that results in the formation of CO is dangerous because it is odorless, colorless,
tasteless, and contrary to popular belief, it is non-irritating. The gas is also lighter than air and consequently,
if it is escaping from a plugged or leaking boiler fireside, can rise to occupied areas. CO can only be
detected with special test or monitoring equipment.
Causes of Incomplete Combustion
1. Insufficient or too much oxygen
• Air problems (rule of thumb -1 cubic foot of air for every 100 Btus of gross heating value).
• Minimum air intake openings for a given input.
Oil - unconfined = 28 square inches per gallon
Confined =140 square inches per gallon
Gas - draft hood = 1 square inch per 5,000 Btu
Barometric = 1 square inch per 14,000 Btu
Direct = 1 square inch per 17,500 Btu
2. Insufficient or too much fuel
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Heat: Boilers
• Fuel is not vaporized - possible reasons
Worn nozzle
Clogged nozzle
Pump pressure is incorrect
Pump, lines, filter or tank lines are clogged
Cold fuel
• Water in fuel - possible causes
Supplier doesn't supply quality fuel
Tank is located outside
Cover the fill opening and vent to protect from rain
3. Insufficient or inconsistent heat
• The ignition system is used to provide the proper temperature (called kindling point) for the
light off of the vaporized fuel under design conditions. When design conditions are not met,
light off will not occur.
• An established flame is usually sufficient to maintain the kindling point. However, anytime the
combustion temperature falls below the kindling point, the combustion triangle is broken and
combustion stops. A safety device will shut the fuel off within 3 seconds of flame failure.
Calculating Combustion Efficiency
The calculation of combustion efficiency is based upon three factors.
1. Chemistry of the fuel
2. Net temperature of the stack gases
3. The percentage of oxygen or carbon dioxide by volume in the stack gases
Eyeballing the flame for color, shape and stability is not enough for maximizing efficiency.
Commercial analyzers are available to accurately gauge combustion efficiency. The simplest units measure
only C>2 or CC>2. Exhibit 7.8 lists efficiencies for common heat generation devices.
Exhibit 7.8: Combustion Efficiencies
Notes
Process Type
Fireplace
Space Heater
Commercial Atmospheric Gas Boiler
Oil Power Burner
Gas Power Burner
Condensing Furnace (Gas or Oil)
Efficiency [%]
10-30
50-82
70-82
73-85
75-83
85-93
There are no standard performance efficiency levels that commercial boiler manufacturers must
adhere to. Efficiency is reported in different terms:
• Thermal Efficiency - A measure of effectiveness of the heat exchanger that does not account for
radiation and convection losses.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
219
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Heat: Boilers
Notes
• Fuel to Steam Efficiency - A measure of the overall efficiency of the boiler accounting for radiation
and convection losses.
• Boiler Efficiency - Refers to either thermal efficiency or Fuel to Steam Efficiency.
Installation of controllers such as a temperature setback device can result in savings of up to 18% of
annual heating costs. A controller can sense the inside or outside temperature, or both. Controllers manage
the boiler cycling and/or control valves based upon the ratio of the two temperatures and the rate of change of
each. Burner controls maximize the burner's efficiency. One way this can be done is by using two-stage
(high-low) burners. Another possibility is the utilization of higher voltage electronic ignition that improves
light off and consequently reduces associated soot accumulation. Employment of interrupted ignition reduces
the run time of ignition components by approximately 98% during heating season increasing ignition
component life.
7.1.2 Typical Performance Improvements
Some performance improvements are easily achieved and many of which are proper maintenance or
operation procedures. This section covers a few of the more common ones.
7.1.2.1 Adjustment of Fuel and Air Ratio
For each fuel type, there is an optimum value for the air/fuel ratio. The air/fuel ratio is the ratio of
combustion air to fuel supplied to the burner. For natural gas boilers, this is 10% excess air, which
corresponds to 2.2% oxygen in the flue gas. For coal-fired boilers, the values are 20% excess air and 4%
oxygen. Because it is difficult to reach and maintain these values in most boilers, it is recommended that the
boiler air/fuel ratio be adjusted to give a reading of 3% oxygen in the flue gas (about 15% excess air) for
gas-fired boilers and 4.5% (25% excess air) for coal-fired boilers. For natural gas boilers, the efficiency is a
function of excess/deficient air and stack temperature. The curves for oil and coal-fired boilers are similar.
Because the efficiency decreases rapidly with deficient air, it is better to have a slight amount of excess air.
Also, the efficiency decreases as the stack gas temperature increases. As a rule of thumb, the stack
temperature should be 50° to 100°F above the temperature of the heated fluid for maximum boiler efficiency
and to prevent condensation from occurring in the stack gases. It is not uncommon that as loads on the
boiler change and as the boiler ages, the air/fuel ratio will need readjusting. It is recommended that the
air/fuel ratio be checked as often as monthly. Combustion analyzers are available for less than $1,000, and it
is often recommended that these be purchased. Case studies illustrating this opportunity can be found in
Appendix E.
Exhibit 7.9 illustrates the average cost savings from implementation of this opportunity.
Exhibit 7.9: Air/Fuel Ratio Reset: Costs and Benefits
Options 1
Air/Fuel
Ratio Reset
Installed Costs
(S)2
1,673
Energy Savings
(MMBtu/yr)
2,339
Cost Savings
($/yr)3
5,691
Simple Payback
(yr)
0.3
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 70%.
2. One example from the IAC database to further clarify the costs is as follows: Adjusting the air/fuel
ratio on a 6.3 MMBtu/hr boiler at a concrete plant resulted in energy and cost savings of 1,814
MMBtu/yr and $4,760/yr. The implementation cost was $1,500, which was the cost for flue gas
analysis equipment and labor.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
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Heat: Boilers
7.1.2.2 Elimination of Steam Leaks
Significant savings can be realized by locating and repairing leaks in live steam lines and in
condensate return lines. Leaks in the steam lines allow steam to be wasted, resulting in higher steam
production requirements from the boiler to meet the system needs. Condensate return lines that are leaky
return less condensate to the boiler, increasing the quantity of required make-up water. Because make-up
water is cooler than condensate return water, more energy would be required to heat the boiler feed water.
Water treatment would also increase as the make-up water quantity increased. Leaks most often occur at the
fittings in the steam and condensate pipe systems. Savings for this measure depend on the boiler efficiency,
the annual hours during which the leaks occur, the boiler operating pressure, and the enthalpies of the steam
and boiler feed water where enthalpy is a measure of the energy content the steam and feed water.
Exhibit 7.10 lists average cost savings and energy conservation from implementation of this
opportunity.
Exhibit 7.10: Steam Leak Repair: Costs and Benefits
Notes
Options1
Steam Leak
Repair
Installed Costs
($)2
873
Energy Savings
(MMBtu/yr)
1,628
Cost Savings
($/yr)3
5,548
Simple
Payback (yr)
0.2
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data.
2. The implementation rate for this measure was 81%.One example from the IAC database to further
clarify the costs is as follows: Repairing steam leaks on a 600 hp boiler system at a rendering plant
resulted in energy and cost savings of 986 MMBtu/yr and $4,535/yr. The implementation cost was
$350.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
7.1.2.3 Variable Frequency Drives for Combustion Air Blowers
The load on a boiler typically varies with time, and, consequently, the boiler firing-rate varies
between low and high fire. The amount of combustion air required changes accordingly. Common practice
has been to control a damper or vary the positions of the inlet vanes in order to control the airflow; that is,
when inlet air is required the damper is essentially closed and opened as more air is required. This is an
inefficient method of airflow control because air is drawn against a partially closed damper whenever the
maximum amount of combustion air is not required. It is much more efficient to vary the speed of the blower
by installing a variable-frequency drive on a blower motor (note that it is sometimes expensive to install a
variable-frequency drive if inlet vanes exist). Because the power required to move the air is approximately
proportional to the cube of the airflow rate, decreasing the flow rate by a factor of two will result in a
reduction of power by a factor of eight. This measure is particularly significant on boilers of 3.3 MMBtu/h or
greater.
Combustion air blower variable-frequency drives are available from boiler manufacturers for new
boiler installation. They also may be retrofitted to an existing boiler with few changes to the boiler. Exhibit
7.11 presents average cost savings and energy conservation from implementation of this opportunity.
Exhibit 7.11: (ASD) - Variable-Frequency Drives: Costs and Benefits
Options1
Combustion Air
Blower Variable -
Frequency Drives
Installed
Costs ($)2
23,967
Energy
Savings
(MMBtu/yr)
1,115
Cost Savings
($/yr)3
13,789
Simple
Payback (yr)
1.7
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Heat: Boilers
Notes
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 33%.
2. One example from the IAC database to further clarify the costs is as follows: Installing variable speed
drives and corresponding controls on two 250 hp combustion air fans at a food processing plant resulted
in energy and cost savings of 488,445 MMBtu/yr and $28,000/yr. The implementation cost was
$80,000.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center, which
are usually almost identical to actual savings reported from the facility.
7.1.2.4 Maintenance of Steam Traps
A steam trap holds steam in the steam coil until the steam gives up its latent heat and condenses. In
a flash tank system without a steam trap (or a malfunctioning trap), the steam in the process heating coil
would have a shorter residence time and not completely condense. The uncondensed high-quality steam
would be then lost out of the steam discharge pipe on the flash tank. Steam trap operation can be easily
checked by comparing the temperature on each side of the trap. If the trap is working properly, there will be
a large temperature difference between the two sides of the trap. A clear sign that a trap is not working is the
presence of steam downstream of the trap. Non-working steam traps allow steam to be wasted, resulting in
higher steam production requirement from the boiler to meet the system needs. It is not uncommon that,
over time, steam traps wear and no longer function properly. Exhibit 7.12 lists average cost savings and
energy conservation from implementation of this opportunity.
Exhibit 7.12: Steam Trap Repair: Costs and Benefits
Options1
Steam Trap Repair
Installed
Costs ($)2
2,560
Energy
Savings
(MMBtu/yr)
5,431
Cost Savings
($/yr)3
14,885
Simple
Payback (yr)
0.17
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 79%.
2. One example from the IAC database to further clarify the costs is as follows: Repairing one steam trap
resulted in energy and cost savings of 105 MMBtu/yr and $483/yr on a 600 hp boiler at a rendering
plant. The implementation cost was $220.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center, which
are usually almost identical to actual savings reported from the facility.
7.1.2.5 High Pressure Condensate Return Systems
As steam looses it's heat content is condenses into hot water called condensate. A sudden reduction
in the pressure of a pressurized condensate will cause the condensate to change phase into steam, more
commonly called flashing. Flash tanks are often designed into a pressurized return system to allow flashing
and to remove non-condensable gases from the steam. The resulting low-pressure steam in the flash tank
can often be used as a heat source.
A more efficient alternative is to return the pressurized condensate directly to the boiler through a
high-pressure condensate return system. Heat losses due to flashing are significant, especially for high-
pressure steam systems. Steam lost due to flashing must be replaced by water from the city mains (at
approximately 55°F). This causes the feed water mixture to the boiler to be significantly below its boiling
point, resulting in higher fuel consumption by the boiler. Water treatment costs are also greater with
increased flash losses. In a retrofit application, a closed, high-pressure condensate return system would
prevent the flashing that occurs in the existing system by returning the condensate to the boiler at a higher
pressure and temperature, thereby reducing boiler energy requirements and water treatment costs.
Non-condensable gases (such as air and those formed from the decomposition of carbonates in the
boiler feed water treatment chemicals) can be removed from a closed condensate return system through the
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Heat: Boilers
use of variable orifice discharge modules (VODMs). VODMs are similar to steam traps in that they return
condensate but also can remove non-condensable gases. In a system that does not contain VODMS, these
gases can remain in the steam coil of the equipment being heated and can form pockets of gas that have the
effect of insulating the heat transfer surfaces, thus reducing heat transfer and decreasing boiler efficiency.
Exhibit 7.13 lists average cost savings from installation of a condensate return system.
Exhibit 7.13: Condensate Return Systems: Costs and Benefits
Notes
Options1
High Pressure
Condensate Return
Installed
Costs ($)2
6,931
Energy
Savings
(MMBtu/yr)
9,688
Cost Savings
($/yr)3
12,738
Simple
Payback (yr)
0.5
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 59%.
2. One example from the IAC database to further clarify the costs is as follows: Installing of high-pressure
condensate return system equipment at food processing plant resulted in energy and cost savings of 4,727
MMBtu/yr and $ 14,100/yr. The implementation cost was $37,000.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center, which
are usually almost identical to actual savings reported from the facility.
7.2 Heat Recovery Systems
Heat recovery systems are installed to make use of some of the energy which otherwise would be
lost into the surroundings. The systems use a hot media leaving the process to preheat other, or sometimes
the same, media entering the process. Thus energy otherwise lost does useful work.
7.2.1 General Considerations
The first step in heat recovery analysis is to survey the plant and take readings of all recoverable
energy that is being discharged into the atmosphere. The survey should include analysis of the following
conditions:
• Exhaust stack temperatures
• Flow rates through equipment
• Particulates and corrosives of condensable vapors in the air stream
Ventilation, process exhaust and combustion equipment exhaust are the major sources of
recoverable energy. Exhibit 7.14 illustrates typical energy savings achieved by preheating combustion air
with hot exhaust gases from process or furnaces.
Regardless of the amount or temperature of the energy discharged, recovery is impractical unless the
heat can be effectively used somewhere else. Also, the recovered heat must be available when it is needed.
Waste heat recovery systems can be adapted to several applications including:
• Space heating • Combustion air preheating
• Make-up air heating • Boiler feed water preheating
• Water heating • Process cooling or absorption air
conditioning
• Process heating
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
223
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Heat: Heat Recovery Systems
Notes
Exhibit 7.14: Fuel Savings Realized by Preheating Combustion Air
Furnace
Outlet
Temp. °F
2600
2500
2400
2300
2200
2100
2000
1900
1800
1700
1600
1500
1400
Combustion air preheat temperature, °F
400
22
20
18
17
21
16
15
14
13
13
12
11
10
500
26
24
22
21
20
18
17
16
16
15
14
14
13
600
30
28
26
24
23
22
20
19
19
18
17
16
16
700
34
32
30
28
26
25
23
22
21
20
19
19
18
800
37
35
33
31
29
28
26
25
24
23
22
21
20
900
40
38
36
34
32
30
29
27
26
25
24
23
22
1000
43
41
38
36
34
33
31
30
29
27
26
25
25
1100
46
43
41
39
37
35
33
32
31
30
28
27
27
1200
48
45
43
41
39
37
36
34
33
32
30
29
28
1300
50
48
45
43
41
39
38
36
35
33
32
31
30
Note: 1. Numbers represent fuel savings in percent.
2. Natural gas with 10% excess air. Other charts are available for different fuels and
various amount of excess air
7.2.2 Types of Heat Recovery Equipment
Choosing the type of heat recovery device for a particular application depends on a number of
factors. For example air-to-air equipment is the most practical choice if the point of recovery and use are
closely coupled. Air-to-liquid equipment is the logical choice if longer distances between the heat source
and heat requirements are involved. Included in this section are five types of heat recovery systems:
• Regenerative units
• Recuperators
• Economizers
• Heat pipes
• Shell and tube heat exchangers
7.2.2.1 Economizers
Economizers are air-to-liquid heat exchangers. Their primary application is to preheat boiler feed
water. They may also be used to heat process or domestic water, or to provide hot liquids for space heating
or make-up air heating equipment. The basic operation is as follows: Sensible heat is transferred from the
flue gases to the de-aerated feed water as the liquid flows through a series of tubes in the economizer located
in the exhaust stack.
Most economizers have finned tube heat exchangers constructed of stainless steel while the inlet
and outlet ducts are carbon steel lined with suitable insulation. The maximum recommended waste gas
temperature for standard units is around 1,800°F. According to economizer manufacturers, fuel
consumption is reduced approximately 1% for each 40°F reduction in flue gas temperature. The higher the
flue gas temperature is, the greater potential for energy savings.
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Heat: Heat Recovery Systems
7.2.2.2 Heat Pipes
The heat pipe thermal recovery unit is a counterflow air-to-air heat exchanger. Hot air is passed
through one side of the heat exchanger and cold air is passed through the other side in the opposite direction.
Heat pipes are usually applied to process equipment in which discharge temperatures are between 150 and
850 °F. There are three general classes of application for heat pipes:
1. Recycling heat from a process back into a process (process-to-process)
2. Recycling heat from a process for comfort and make-up air heating (process-to-comfort)
3. Conditioning make-up air to a building (comfort-to-comfort)
Heat pipes recover between 60 to 80% of the sensible heat between the two air streams. A wide
range of sizes is available, capable of handling 500 to 20,000 cubic feet of air per minute. The main
advantages of the heat pipe are:
• No cross-contamination
• Operates without external power
• Operates without moving parts
• Occupies a minimum of space
7.2.2.3 Shell and Tube Heat Exchangers
Shell and tube heat exchangers are liquid -to -liquid heat transfer devices. Their primary application
is to preheat domestic water for toilets and showers or to provide heated water for space heating or process
purposes.
The shell and tube heat exchanger is usually applied to a furnace process cooling water system, and is
capable of producing hot water approaching 5 to 10°F of the water temperature off the furnace. To
determine the heat transfer capacity of the heat exchanger the following conditions of the operation must be
known:
1 . The amount of water to be heated in gallons per hour
2. The amount of hot process water available in gallons per hour
3. Inlet water temperature and final water temperature desired
4. Inlet process water temperature
7.2.2.4 Regenerative Unit (Heat Wheel)
The heat wheel is a rotary air-to-air energy exchanger which is installed between the exhaust and
supply air duct work in a make-up or air heating system. It recovers 70 to 90% of the total heat from the
exhaust air stream. Glass fiber ceramic heat recovery wheels can be utilized for preheating combustion air
with exhaust flue gas as high as 2,000°F. Heat wheels consist of a rotating wheel, drive mechanism,
partitions, frames, air seals and purge section. Regeneration is continuous as the wheel rotates through the
hot section picking up energy that is then stored and transferred to the cooler air in the supply section.
7.2.2.5 Recuperators
Recuperators are air-to-air heat exchangers built to provide efficient transfer of heat from hot
exhaust gases to cooler air stream. Recuperators are generally used in the following processes:
• Preheating combustion air
• Preheating material that has to be heated in the process
• Recovery heat from hot gas to supplement or replace the primary heat source in process or comfort
heating applications
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 225
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Heat: Heat Recovery Systems
Notes
There are many different types of recuperator designs available today. The recuperator described
below is primarily used for combustion air preheating.
It consists of three basic cylinders, the hot gases flow up through the inner cylinder, cold
combustion air enters at the bottom of the outer cylinder, flows upward and down through the middle
cylinder, exiting from the bottom of the middle cylinder. Heat energy from exhaust gases is transferred
through the inner cylinder wall to the combustion air by a combination of conduction and radiation heat
transfer. The net effect is preheated air temperature as high as 1,000°F with inlet exhaust gases entering at
7.3 HEATING SYSTEMS
Heating systems are an integral part of industry today. They are used for process heating, drying,
and comfort/space heating. The main purpose of industrial space heating is to provide comfortable
conditions for the people working in these areas but also for purposes such as storage of goods or providing
a controlled environment for sensitive equipment.
The objective of heating is to produce a steady, balanced environment regardless of the outside
conditions. The type of clothing worn and the additional heat sources such as process waste heat must also
be considered when implementing a system. Conservation of energy in heating means getting the most
efficient use from energy while consuming as little as possible. Energy can be conserved by filling gaps and
properly insulating, thus reducing building heat loss. Avoiding overheating practices such as heating a
building when it is unoccupied can also save in energy costs.
The existing industrial heating systems are for the most part inefficient, dated and are often the
principal consumers of energy. The most widely used system is the conventional convection heater that is
highly inefficient and consumes large amounts of energy. Convection heaters use the circulation of steam or
high-pressure hot water in order to generate space heat. Inefficiencies can be attributed to the fact that much
energy is lost in heating the space, or the medium, surrounding the object. It then relies on convection
between the medium and the surface of the object to increase the temperature, or create warmth.
Another dilemma associated with space heating involves the loss of heat due to stratification. Most
systems are designed to heat an area in order to maintain a desired temperature. Energy is wasted because a
majority of the heat is either lost to infiltration and ventilation or eventually rises to the ceiling level
requiring more energy to keep the working level heated. There are several energy conservation
opportunities that can be applied to these operations to reduce the use of energy. This section describes
these measures, namely destratification fans and radiant heating systems, and how they can be applied in
industry.
7.3.1 Destratification Fans
Destratification fans are used to destratify air in buildings. Stratification is a result of an increasing
air temperature gradient between the floor and the ceiling in an enclosed area, usually due to stagnant air.
When there is insufficient air movement, the hot air will rise to the ceiling, resulting in warmer temperatures
in the upper portion of the area and cooler air temperatures at the working level near the floor. An example
of stratification is shown in Exhibit 7.15(a). If stratification is present, the heating requirements of the
facility are increased because the heating system is continually working to maintain the thermostat setpoint
temperature. The thermostat setpoint operates according to the temperature at the working level. Much
effort is required to make up for the heat the working level loses due to this physical occurrence. The
destratification process initiates the movement of the air, creating a more uniform temperature distribution
within the enclosed space. The air temperature at the floor level becomes nearly equal to the air temperature
at the ceiling thus reducing the amount of energy needed to heat the facility. The amount of heat lost to
ventilation and infiltration is also reduced due to the overall reduction in heat being generated.
7.3.1.1 Ceiling Fans
The basic function in destratification is to pull the air from the ceiling level down to the floor level
and allow it to mix with the cooler air and increase the temperature at the working level. This benefits the
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Heat: Heating Systems
comfort of the workers and also reduces the energy use of the facility. This process can be accomplished by
two different means. The first and most common device used is the ceiling fan. The fan draws the air from
above the fan and forces it downward by the power of the specific motor and blade combination. The
resulting motion is an air plume, with the warm air moving downward and outward and essentially creating
a mixture like the one shown in Exhibit 7.15(b). The total air volume and coverage is dependent on the
motor size, height of the fan and the specifications of the fan blade (design, size, rpm). Ceiling fans are also
applicable in cooling conditions. It creates motion in the air and this can assist with evaporative cooling of
the skin surface.
The total number of fans needed in a facility can be determined by the following equation.
Total Plant Area
Notes
Fan Coverage Area
= Number Fans Needed
The fan coverage area depends on the type and size of fan used and this information can usually be obtained
from the fan manufacturer. Placement of the fans is also important. The simplest method of determining
placement is to calculate the distance between each fan. This can be accomplished by using the following
equation.
Distance = ^Fan Coverage Area
Corner fans should be placed half this distance from each wall and consecutive fans should be
placed this distance apart to obtain maximum coverage. Obstacles such as stacked merchandise or office
partitions should be taken into consideration when choosing and placing fans.
7.3.1.2 Ducting
Another option for destratifying the air is to install a hanging device that uses a fan to pull the warm
air from the ceiling, sends it downward through a duct/tube and redistributes the air at the floor level as
shown in Exhibit 7.15(c). This device has advantages and disadvantages. It aids in the destratification
process and creates a more uniform temperature distribution without creating disturbing drafts. It is also
simple to install and can easily be relocated throughout the building. On the other hand, these devices may
be a bit cumbersome and unsightly. They extend from the ceiling down to the floor and create additional
obstacles for the workers and may not be appropriate for some areas of the plant. These devices also do not
possess the cooling applications of the ceiling fans.
Exhibit 7.15: Stratification and Destratification of Air
a) Stratification air pattern, (b) Destratification air pattern using a ceiling fan,
(c) Destratification air pattern using ducting
,.M
••'
7.3.2 Electric Heating
Electrical resistance heating is often inexpensive and convenient to install. However, electric
energy costs at least twice as much as other sources of heat, such as steam or natural gas, although greater
efficiency in use may partially offset this difference. Before a decision is made to heat with electricity, the
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Heat: Heating Systems
Notes
savings these alternative sources can produce should be evaluated in relation to the cost to install them. For
example, consider the replacement of a 500,000-Btu-per hour electric heater with a 500,00-Btu-per-hour
natural gas heater.
Annual Cost of Electric Heater
= 500,000 Btu/hr x S14.65/106 Btu x 80% Eff. - 6,000 hrs/yr = $35,200
Annual Cost of Natural Gas Heater
= 500,000 Btu/hr x S3.00/106 Btu x 50% Eff. x 6,000 hrs/yr = $4,500
The energy cost saving is = $35,200 - $4,500 = $30,700/yr
7.3.2.1 Radiant Heaters
Radiant heaters are used for heating spaces by converting electric or gas energy to heat. It is
important to think thoroughly about the whole picture before recommending radiant heaters because
considered in isolation they probably would not be economically viable.
When dealing with the use of energy for the purpose of heating sometimes it is better to deal
directly with the source of the problem. Convection heaters are inefficient heating devices in that energy is
wasted in heating the space and using that heated air to convectively warm the people and/or objects within
that space. Radiant heaters take a different approach. Radiant heaters operate similar to the sun. Radiant
energy is transferred at the speed of light as electromagnetic waves. The heaters emit infrared radiation that
is absorbed by the people/objects that it strikes, which elevates the temperature of the body, but does not
heat the air through which it travels.
7.3.2.2 Types of Radiant Systems
Radiant heating systems can be gas-fired or electric. The type of radiant heating system used is
determined by the sources available. For example, electric radiant heating systems may be installed in an
area of the building where gas is unavailable even though natural gas is more cost effective than electricity.
The efficiencies for both electric and gas systems are approximately the same but natural gas infrared
systems have a longer lifetime. A radiant heating system is often a relatively easy retrofit measure but may
also be integrated into new construction. Radiant heaters come in different sizes, styles and shapes
according to their application. Exhibit 7.16 shows a typical example of a radiant heater.
In relation to equipment performance, radiant sources can be categorized into three groups. A low
temperature system has source temperatures up to 300°F and would typically be used as a floor or ceiling
heater. A low-intensity system has sources up to 1200°F. A medium-intensity system has temperatures up
to 1800°F and would typically include a porous matrix unit. High-intensity systems have source
temperatures up to 5000°F and usually consist of an electrical reflector lamp and high temperature resistors.
Low-temperature heating systems are usually used in residential and perimeter heating applications such as
schools, offices, and airports. These systems are often incorporated directly into the building structure.
Low-, medium-, and high-intensity systems have more industrial and commercial uses and are usually
assembled units that are installed into existing structures.
7.3.2.3 Applications
Use of radiant systems is ideal for comfort heating. Since the infrared radiation elevates body
temperature without heating the air through which it travels, the same degree of comfort provided by the
convection heaters can be maintained at lower indoor air temperatures with radiant heaters. This measure
also eliminates the problem of stratification. It is beneficial to use these heaters in spaces where the ceilings
are high and stratification is prominent. It is also very practical for areas that are frequently exposed to the
outside air such as loading dock areas. Radiant spot heating helps workers to maintain a comfortable
working temperature even though the space air may be cold. Radiant heat, unlike convection, does not
require a medium to travel through and thus has a much higher heat transfer rate. An advantage of this is its
short response time. The person or object will feel the effects of the system shortly after it is engaged. The
rate of energy transfer is dependent upon many different factors including temperature, emissivity,
reflectivity, absorptivity and transmissivity. Emissivity is a radiative properly that indicates how efficiently
the surface emits compared to an ideal radiator and its value ranges between 0 and 1. Reflectivity,
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Heat: Heating Systems
absorptivity, and transmissivity are the fractions of incidental radiation reflected, absorbed, and transmitted,
respectively.
Exhibit 7.16: Infrared Radiant Heater
Radiant systems can also replace conventional heating methods in process heating. Since radiation
does not need to travel through a medium, more heating work can be accomplished in less space. The
response time when compared with convection heaters can prove to be an advantage in these industrial
applications. The shutdown time for an infrared burner varies from one to 30 seconds. Gas or electric
radiant heaters may be used for different heating applications. Applications include cooking, broiling,
melting and curing metals, curing and drying rubber and plastics, and preshrinking and finishing of textiles.
Notes
7.4 FURNACES AND BURNERS
Furnaces and burners are devices designed to release energy of one form (hydrocarbon bonds) and
convert it into heat. The energy is typically released from gas or oil fuels through a combustion process.
What type of burner or furnace to use and what is the most efficient way of operation highly depends on the
process where it is used. There is always more than one way of solving an engineering problem, however:
in some industries years of research and study of the processes involved might lean toward one recognized
approach and therefore define quite narrowly the equipment best suited. It is obvious that one has to be
careful not to recommend a change of a furnace without knowing the reason why the old seemingly
inefficient one is used.
7.4.1 Burner Combustion Efficiency
Conserving fuel in heating operations such as melting or heat treating is a complex operation. It
requires careful attention to the following:
• Refractories and insulation
• Scheduling and operating procedures
• Preventative maintenance
Burners
• Temperature controls
• Combustion controls
Providing the correct combustion controls will increase combustion efficiency measurably.
Complete combustion of natural gas yields carbon dioxide and water vapor. If gas is burned with out the
correct amount of air, an analysis of the products of combustion will show it contains about 11-12% CC>2
and 20-22% water vapor. The remainder is nitrogen, which was present in the air and passed through the
combustion reaction essentially unchanged.
If the same sample of natural gas is burned with less than the correct amount of air ("rich" or
"reducing fire"), flue gas analysis will show the presence of hydrogen and carbon monoxide, products of
incomplete combustion. Both of these gases have fuel value, so exhausting them from furnaces is a waste of
fuel (see Exhibit 7.17).
If more than the required amount of air is used (lean or oxidizing flame), all the gas will be burnt
but the products of combustion will contain excess oxygen. This excess oxygen is an added burden on the
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Heat: Furnaces and Burners
Notes
combustion system - it is heated and then thrown away thereby wasting fuel. The following steps should be
taken to upgrade burner and combustion controls to prevent these situations:
1. Use sealed burners. Make all combustion air go through the burner - open cage type burners are
very inefficient.
2. Use power burners. Inspirator or atmosphere burners have very poor mixing efficiency at low
inputs, especially for low pressure natural gas.
3. Install a fuel/air ratio control system.
Exhibit 7.17: Percent Excess Air From C(>2 Reading
Percent CO
7.4.2 Premix Burner Systems
Premix burner systems commonly use a venturi mixer known as an aspirator or proportional mixer.
Air from the blower passes through the venturi, creating suction on the gas line, and the amount of gas
drawn into the mixer drops in proportion to airflow. Aspirator systems are fairly simple to adjust and
maintain accurate air/fuel ratios over wide turndown ranges, but their use is limited to premix burners.
7.4.3 Nozzle Mix Burners
Nozzle mix burners used with a Ratio Regular system is widely used for industrial furnace
applications. Orifices are installed in the gas and air lines to a burner and then adjusted so that air and gas
are in correct burning proportions when pressure drops across the orifices are equal. Once the orifices are
set, they will hold the correct air/gas ratio as long as the pressure drop remains the same, no matter what
firing rate. Ratio Regular systems have good accuracy and are fairly easy to adjust.
On large furnaces where fuel consumption is extremely high, or on furnaces where very close
control of the atmosphere is required, extremely accurate air/fuel ratio control is vital, both for fuel economy
and product quality. On these installations hydraulic or electronic flow controls are often used.
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Heat: Furnaces and Burners
Notes
These systems feature fixed orifices in both gas and air streams, and these orifices are sized to pass
proportional amounts of gas and air at equal pressure drops, pressure drop signals are fed to a ratio controller
which compares them. One of the outstanding features of this system is that the air/fuel ratio can be
adjusted by turning a dial. Since a burner can be thrown off correct gas ratios by changes in ambient air
temperature and humidity, this ratio adjustment feature permits the operator to set the burner back to peak
operating efficiency with very little effort.
On multiple burner furnaces, the combustion products of all burners mix together before they reach
the flue gas sampling point. Furnaces should have manifolded flue gas outlets to obtain a common sampling
point for flue gas analysis. If, for example, some of the burners are unintentionally set lean, and others rich,
the excess air from the lean burners could consume the excess fuel from the rich burners, producing flue gas
with optimum CO2 and practically no free oxygen or combustibles. Samples of these gases could be
misleading and show correct air/gas ratio, when in fact they are not. Also, if a burner is set rich and the
excess combustibles in the flue gases find air in the stack and burn there, flue gas analysis will again suggest
that the burner is properly adjusted.
To overcome the problem of misleading flue gas analysis in multi-burner furnaces, metering
orifices should be installed on the gas lines to each burner. If pressure drops across all orifices are identical,
gas flow to each burner will be the same.
7.4.4 Furnace Pressure Controls
Furnace Pressure Controls afford additional energy savings, particularly on topflued furnaces. If a
furnace operates under negative pressure, cold air is drawn into it through badly fitted doors and cracks.
This cold air has to be heated, adding to the burden on the combustion system and wasting fuel. If the
furnace operates at high positive pressure, flames will sting out through doors, site ports and other openings,
damaging refractories and buckling shells. Ideally a neutral furnace pressure overcomes both these
problems. Automatic furnace pressure controls maintain a predetermined pressure at hearth level by
opening or closing dampers in response to furnace pressure fluctuations.
In summation, good air/fuel ratio control equipment and automatic furnace pressure controls are
two useful weapons for combating energy waste in heating operations. Properly applied, they also offer the
side benefits of improved product quality and shortest possible heating cycles.
7.4.5 Furnace Efficiency
Conventional refractory linings in heating furnaces can have poor insulating abilities and high heat
storage characteristics. Basic methods available for reducing the heat storage effect and radiation losses in
melt and heat treat furnaces are:
1. Replace standard refractory linings with vacuum-formed refractory fiber insulation material.
2. Install fiber liner between standard refractory lining and shell wall.
3. Install ceramic fiber linings over present refractory liner.
Refractory fiber materials offer exceptional low thermal conductivity and heat storage. These two
factors combine to offer very substantial energy savings in crucible, reverberatory and heat-treat furnaces.
With bulk densities of 12-22 Ibs/cu ft, refractory fiber linings weigh 8% as much as equivalent volumes of
conventional brick or castables. In addition, refractory fibers are resistive to damage from extreme and rapid
changes in temperature. These fiber materials are simple and fast to install. The density of fiber refractory
is low, therefore much less heat is required to bring the lining to operating temperature. This results in rapid
heating on the start-up. Conversely, cooling is also rapid, since there is less heat stored in the lining.
The basic design criteria for fiber lined crucible furnaces are the same as used for furnaces lined
with dense refractories. Two rules should be followed.
1. The midpoint of the burner should be at the same level as the bottom of the crucible, and the burner
should fire tangentially into the space between the crucible and lining.
2. The space between the outside of the crucible, and the furnace lining near the top should be about
10% of the crucible diameter.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 231
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Heat: Furnaces and Burners
Notes
Crucible furnaces can be constructed using a combination of fiber with dense refractory or almost
entirely out of fiber. Increasing the proportion of fiber will increase the energy savings and maximize the
other benefits previously listed.
Fiber materials are available in varying thicknesses, suitable for a complete monolithic installation,
and composition to handle 2400°F, 2600°F, and 2800°F. The higher temperature compositions contain high
aluminum fiber, which lowers the amount of shrinkage at elevated operating temperatures.
7.4.6 Furnace Covers
Installation of furnace covers is necessary to reduce preheating of combustion air. Thermal shock
and spalling have caused problems in the fabrication and use of furnace covers. Materials available today,
such as refractory fiber, have eliminated these problems.
In addition to technological advantages of fiber insulation, industry has also developed the
capability of vacuum forming these materials over a variety of metallic support structures. Fiber insulation
can be formed over either expanded metal or angle iron frames, or both, with V-type anchors attached. The
anchors are made from high temperature alloys, holding the fiber to the metallic support structures to
provide an integral, fully secured assembly. No part of the anchor system is exposed to excessive
temperatures. This eliminates attachment problems for ladle pre-heaters, crucible furnace covers, and
induction furnace covers. Installation of furnace covers improves the thermal efficiency of the process by
approximately 50%.
7.5 Cogeneration
Cogeneration is the simultaneous production of electric power and use of thermal energy from a
common fuel source. Interest in Cogeneration stems from its inherent thermodynamic efficiency. Fossil
fuel-fired central stations convert only about one-third of their energy input to electricity and reject two-
thirds in the form of thermal discharges to the atmosphere. Industrial plants with Cogeneration facilities can
use the rejected heat in their plant process and thereby achieve a thermal efficiency as high as 80 percent.
7.5.1 The Economics of Cogeneration
In-plant generation of electricity alone is not usually economical; a variable use must be made of
the by-product waste heat. For this reason the demand for both types of energy must then be in balance,
typically 100 kW versus 600,000 Btuh, for a gas turbine installation.
In most potential applications of industrial Cogeneration, more electric power would be produced in
meeting the plant's thermal requirement than could be used internally. However, the enactment of PURPA
(Public Utility Regulatory and Policies Act of 1978) greatly expanded the application for Cogeneration by
granting qualified cogenerators the right to:
• Interconnect with a utility' s grid
• Contract for backup power with the utility at nondiscriminatory rates
• Sell the power to the utility at the utility's avoided cost.
There are several reasons for considering Cogeneration besides energy savings.
• Energy independence
• Replacement of aging equipment
• Expansion of facilities
• Environmental considerations
• PURPA franchise to sell electricity
• Power factor improvement
However, plant conditions must fit certain requirements for a successful Cogeneration application.
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Some factors are:
Heat: Cogeneration
Notes
• The nature of the process must be suitable for cogeneration. Certain processes lend themselves
more readily to cogeneration, such as refining, petrochemical, and pulp and paper industries, which
have accounted for many of the larger cogeneration installations to date.
• The rate differential between electricity and fossil fuels should be relatively high on an equivalent
Btu basis.
• Plant operation of 6,000 hours per year is usually the minimum needed to justify installation and
continuous operation thus improving reliability by minimizing dependence on the starting system.
• A source of waste fuel in suitable quantity provides an attractive incentive for cogeneration.
Although plant conditions may appear favorable for cogeneration, the long-term situation should
also be considered before proceeding with a project. Factors that should be considered for long-term
evaluation of cogeneration are:
1. The long-range cost of fuel for gas- and oil-fired units must be considered
2. Excess coal-fired generating facilities and abundant coal supplies can result in increased
competition from utilities and lower avoided costs.
3. Utilities may press for repeal of PURPA or at least the ability to discount the avoided cost purchase
rate.
4. Long-term continuity of operations. Facilities that are expecting significant changes in operation or
ownership should determine the viability of the initially large investment.
5. Reliability requirements of the cogeneration facility will be important. Maintenance and reliability
of equipment is very important as the cost of penalty for additional utility charges for any outage
can be significant where demand charges are high.
Aside from long-term effects, other alternatives to cogeneration may negate some of its benefits.
These alternatives include renegotiation of electrical rates, load management, technology improvements,
process changes, and energy conservation.
1. Renegotiating rates may enable an industrial plant to duplicate the potential economic benefits of
cogeneration without the risk of building and operating a power plant.
2. Load management techniques may be able to modify peak demands.
3. Major technological improvements or process changes can occur and significantly alter the present
energy requirements.
4. Where available capital is limited, energy conservation may be able to reduce electrical
consumption significantly by using projects with more attractive returns.
7.5.2 Cogeneration Cycles
There are many possible types of cogeneration cycles but most can be considered variations of the
two basic cycles gas turbine and steam/turbine as shown in Exhibit 7.18.
In the case of the gas turbine cogeneration cycle, air is compressed and injected into the combustor
along with the fuel, generally natural gas. The combustion gases at high temperature and pressures expand
rapidly in the turbine, doing work in the process. The turbine drives an electrical generator and air
compressor. The exhaust gas from the turbine, which is still at a high temperature, is then used to generate
steam in a waste heat boiler.
The cost of a gas turbine with heat recovery equipment ranges between $600 to $1,000 per kW,
depending on the specific design conditions. Gas turbine systems costs are reduced by over 50 percent with
larger units.
There are several advantages of the gas turbine system in comparison with the steam/turbine
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 233
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Heat: Cogeneration
Notes
system.
• Lower capital cost (normally 50 to 70 percent of steam/turbine cost)
• Lower operating and maintenance cost.
• Higher power-to-heat ratio that is generally more desirable in industrial applications.
A reciprocating engine, generally a diesel, can be used in lieu of the turbine to supply the motive power.
Since the exhaust from the engine is at a much lower temperature, only low pressure steam (maximum of 50
psig) or hot water can be generated without supplemental heating.
Exhibit 7.18: Cogeneration Cycles
. Gas TuftJine Cogeneration Cycis
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7.5.2.1 Cogeneration High-Spot Evaluation
A quick evaluation of potential cost savings from installation of a Cogeneration system can be
performed to determine if a more detailed analy sis is warranted. Example calculations are presented in this
section to illustrate a high-spot evaluation. These calculations are illustrated in Exhibit 7.19 and Exhibit
7.20.
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Heat: Cogeneration
Exhibit 7.19: Gas-Turbine Cycle
Notes
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Given process steam demand = 30,000 Ibs/hr equivalent to 30 MMBtu/hr
Heat Input to Boiler = (30 MMBtu/hr) / (70% Waste heat eff.) = 43 MMBtu/hr
Exhaust = 43-30 = 13 MMBtu/hr
Electrical output (based on typical 100 kW/600,000 Btu):
= {(30 MMBtu/hr) / (0.6 MMBtu/hr)} x 100 kW = 5,000 kW
Equivalent Btus = 5,000 kW x 3413 Btu/kW = 17 MMBtu/hr
Total Energy Input = 17 + 30 + 13 = 60 MMBtu/hr
Annual cost of operation:
= 60 MMBtu/hr x 8,000 hrs x $3.00/MMBtu/hr = $ 1,440,000/yr
Avoided cost of purchased electricity:
= 5,000 kW x 8,000 hr x$0.05/kWh = $2,000,000/yr
Avoided cost of steam:
= {[(30 MMBtu/hr) x (80,000 hr)] / [80% Steam boiler eff]} x $3.00 /MMBtu = $900,000 per year
Annual Saving = $2,000,000 + $900,000 - $140,000 = $l,460,000/yr
Investment = $l,000/kW x 5,000 kW = $5,000,000/yr
Payback = $5,000,000 / 1,460,000 = 3.4 years
Given - process steam demand = 30,000 Ibs/hr, equiv. to 30 MMBtu/hr
- boiler steam = 600 psig, 750 F
- turbine steam rate = 12.2 Ibs/kWh @ 70% eff. = 17.4 act. Ibs/kWh
(Refer to Steam Turbine Tables for other conditions)
kWh = (30,000 Ibs/hr) / (17.4 Ibs/kWh) = 1720 kW
Equivalent Btu/hr = 1720 x 3413 x 10 -6 = 7.4 MMBtu/hr
Total energy input = (7.4 + 30) / (80% boiler eff.) = 44 MMBtu/hr
Annual cost of operation:
= 44 MMBtu/hr x 8,000 hrs x $3.00/MMBtu = $l,056,000/yr
Avoided cost of electricity:
= 1720 kW x 8,000 hrs x $0.05/kWh = $688,000/yr
Avoided cost of process steam:
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Heat: Cogeneration
Notes
= [(30 MMBtu/hr) / (80% boiler eff.)] x (80,000 hrs) x ($3,00/MMBtu/hr) = $900,000/yr
Annual Saving = $688,000 + $900,000 - $1,056,000 = $532,000/yr
Investment = $l,500/kW x $1,720 kW = $2,580,000/yr
Payback = ($2580,000) / ($532,000) = 4.8 years
Exhibit 7.20: Steam-Turbine Cycle
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Oil and gas-fired engine cogeneration systems are most suitable for smaller installations (under 1
MW). Packaged units are available from a few kilowatts to over a megawatt. The systems include a prime
mover, generator switchgear, heat recovery, and controls. Equipment costs range from $500 to $l,000/kW.
Installation costs for plumbing, electrical, and other facilities typically add 50 to 150 percent to the
equipment cost. Total turnkey costs range from $700 to $2,000/kW.
Experience with the smaller size units (under 100 kW) has been relatively short. In the
steam/turbine system, fuel is burned in a boiler to generate steam. The steam is passed through a topping
turbine that drives the electric generator. The exhaust steam is then used for process heating.
The greatest advantage of these systems is their ability to use practically any kind of fuel including
lower-cost solid or waste fuels, either alone or in combination. The capital cost of steam turbine systems is
higher, typically 50 to 100 percent greater than a gas turbine system using natural gas or oil.
7.5.2.2 Estimate of Savings
A high-spot estimate of savings should be made as early in the investigation as possible to confirm
that cogeneration is merited; a detailed energy-load analysis should be made. This involves preparing a
profile on the plant's steam and electric usage, taking into account daily, weekly, monthly, and seasonal
variations. Using actual loads instead of average loads is important to determine whether periods of low-
load factor are a problem. System performance will be best where output is steady instead of fluctuating
with load.
With this data, plant personnel can select the most advantageous cogeneration cycle, taking into
account various possible operating conditions and equipment options. A computer model analysis is very
useful for this purpose. Equipment vendors can be utilized if outside assistance is needed to make the
computer analysis.
The options that can be considered are as follows:
• Combined cycle - permits the use of a flexible instead of fixed ratio of electrical to thermal energy
to adjust for variations in the steam demand
• Steam pressure - the higher the pressure the more efficient the turbine steam rate. When high-
pressure steam or gas must be reduced in pressure through a pressure-reducing valve, a simpler
system known as "induction generation" can be used to generate electricity.
• Steam injection - adds to turbine efficiency
• Extraction turbine - provides process steam for use at different pressures
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Heat: Cogeneration
Notes
• Water treatment method - high-pressure steam turbines require more sophisticated boiler feed water
treatment
• Dual burners - burners capable of burning more than one fuel add flexibility to use lowest cost fuel
• Degree of automation - fully automatic systems increase price significantly
• Duct burner in exhaust stream - increases output and permits generation of higher pressure steam
• Steam condenser - permits additional electrical generation from steam turbine at some loss in
efficiency
• Generator type - power factor is improved with higher cost synchronous generator
• Parallel or independent operation will affect switchgear selection.
After the operating conditions and cogeneration facilities have been fully defined, the savings and
investment estimates should be revised to complete the initial evaluation of the cogeneration facility.
7.6 Thermoenergy Storage Systems
The application of thermal storage is based on savings from using lower cost electrical rates with
night-time operation to provide daytime thermal needs. Two conditions must be present to make thermal
storage attractive.
First, there must be a significant difference between night and daytime electrical costs. The
difference can be increased by higher summertime rates and inclusion of a ratchet provision for the next 11
months. Utilities generally encourage thermal storage because it permits them to transfer a portion of their
daytime load from expensive peaking facilities to nighttime base-loaded, higher efficiency coal and nuclear
plants.
Accordingly, the electric rate structure will encourage customers to shift their electrical load from
daytime peak hours to nights and weekends by any or all of the following provisions in the rate structure.
• Time-of-day energy charge
• Demand charges (per kW peak power consumed during peak hours each month)
• Winter/summer rates for energy and/or demand charges
• A ratchet clause (monthly demand is the same or same percentage of the highest demand in
previous 11 months).
Second, the daytime refrigeration load must result in high daytime cost, generally from peak
demands, which have the potential to be reduced with thermal storage. Plants with one-shift operation or
high solar load can be good candidates. Thermal storage has found application, for example, in office air
conditioning. On the other hand, industrial plants with three-shift operation are normally not good
candidates because of their higher content load.
Before considering thermal storage as a means of reducing electrical cost, alternate methods should
be evaluated, as in most energy conservation approaches. Some possible alternate methods are absorption
refrigeration, demand control, load scheduling, and using an emergency generator for peak shaving.
7.6.1 High Spot Evaluation
Where thermal storage appears to be a viable option, a high spot evaluation should be made to
determine if further investigation is justified (see Exhibit 7.21). The incremental electrical cost must be
broken down into its separate components for this evaluation. In this example, it is assumed there is no off-
peak demand charge and the off-peak electrical energy rate is less than the on-peak rate. For simplicity it is
also assumed that the daytime refrigeration load increases the peak demand directly by 1 kW for each kW of
load. In practice, the peak demand may be caused in part by other operations, therefore, the actual potential
reduction in peak demand from thermal storage would depend on its interrelationship with other loads.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 237
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Heat: Thermoenergy Storage Systems
Notes
7.6.2 Electric Load Analysis
A detailed electrical load analysis is necessary to determine the impact thermal storage will have on
the existing peak demand because of this interrelationship with other loads. Use of average loads will not be
satisfactory for this purpose.
The operating cost per ton for a thermal storage system is also higher than for a conventional
system. The refrigeration machine must operate at a lower temperature, which requires more energy per ton.
There is also some inherent loss in storage. One system reported that power consumption increased by 17
percent when the system was producing ice.
Exhibit 7.21 shows that incremental investment for thermal storage results in an attractive payback.
However, it should be emphasized that the example attributes maximize demand saving over the full year of
operation and for the full capacity of the unit. A well-documented analysis of all energy flows and costs is
needed for a more in-depth evaluation. A number of questions will also have to be answered as part of the
evaluation, such as:
• Should the thermal storage be for heating storage, cooling storage, or both?
• Should the system handle 100 percent of the cooling load or only the portion needed for load
leveling?
• Should the storage system be water or ice?
• Should the storage system be for a daily or weekly cycle?
Generally, systems have been for daily cycles and load levelers only.
Exhibit 7.21: Thermal Storage High Spot Evaluation
Electrial Rate:
Demand kW
Energy kWh
On-Peak
$9.40
$0.03
Off-Peak
NC
$0.025
Conventional Refrigeration System
Demand Cost/ton-yr = $/kW x 12 months
$9.40 x 12 months =
Energy Cost/ton-yr = 1 kWh/ton x $/kWh x hrs/yr
Total Cost/ton-yr
= $0.03 x 8,000 =
= $113 + $240 =
$113/yr
$240
$353
Thermal Storage System
Cost/ton-yr = 1 kWh/ton x % increase x $/kWh x hrs/yr
Savings
= 1x1. 20 x $0.025x8,000
= $353 - $240 =
$240
$113
Investment
Investment/ton - Conventional Refrigeration System
Investment/ton - Thermal Storage System
Additional Investment/ton
$400
$550
$150
238
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Heat: Thermoenergy Storage Systems
REFERENCES
1. "Testing & Measurement" Bulletin 4011 Bacharch Inc.
2. "Boiler Efficiency" Bulletin CB 7767 Cleaver Brooks Co.
3. "Heat-Timer Model HWR" File No. 30-E-l Heat Timer Co.
4. "Digi-Span" File No. 980MHeat Timer Co.
6. "Auto. Vent Damper" Form No. 60-2523 Honeywell Inc.
7. "Chronotherm 3" Form No. 68-0056-1 Honeywell Inc.
8. "Perfect Climate" Products Form 70-2317/8-92 Honeywell
9. "Flame Safeguard Manual" No. 708107 Honeywell
10. "Principles of Steam Heating" Dan Holohan
11. Maine Oil & Solid Fuel Board Rules
12. NFPA Code #31 Installation of Oil Burning Equipment
13. "Boiler Efficiency Improvement" Dyer/Maples
14. "Application Data for Burners" Form No. 30-60004A Iron Fireman Div. Dunham Bush Co.
15. Grainger, Inc., Air Circulators, Dayton Fans, p. 2318.
16. McMaster-Carr Supply Company, Net Prices Catalog.
17. Rutgers University, Industrial Assessment Report No. RU-00146, ECO No. 03, pp. 28-30.
18. Chase Industries, Bulletin No. 8102,1981.
19. Colorado State University, Allied Signal Energy Conservation Training Program, 1994.
20. Buckley, Norman A., "Application of Radiant Heating Saves Energy," ASHRAE Journal, V 31, No. 9,
September 1991, p. 18.
21. Incropera, Frank P. and DeWitt, David P., Fundamentals of Heat and Mass Transfer, 3rd Ed., John
Wiley & Sons, 1990.
22. University of Tennessee, Industrial Assessment Report No. TN-0535, ECO No. 01, pp. 32-33.
23. Georgia Institute of Technology, Industrial Assessment Report No. GT-0541. ECO No. 02, pp. 8-11.
24. Marks' Standard Handbook for Mechanical Engineers, McGraw-Hill Book Company, 1987.
25. Dyer, D. P., G. Maples, etc., Boiler Efficiency Improvement, Boiler Efficiency Institute, Auburn, AL,
1981,pp.4-31.
26. Witte, L.C., P. S. Schmidt, D.R. Brown, Industrial Energy Management and Utilization, Hemisphere
Publishing Corp., Washington, D.C., 1988, pp. 530-532.
27. Kennedy, W.J., W.C. Turner, Energy Management, Prentice-Hall, Englewood Cliffs, NJ, 1984.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 239
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Heat: Thermoenergy Storage Systems
Notes
THIS PAGE INTENTIONALLY LEFT BLANK
240 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Prime Movers of Energy: Pumps
CHAPTER 8. PRIME MOVERS OF ENERGY
This chapter discusses equipment used to move liquids and gases from place-to-place in a facility or
used to pressurize liquids or gases in industrial facilities. A description of each piece of equipment, its general
uses, operation, and common opportunities for energy conservation are presented. There will be case studies
referenced throughout the chapter that can be found in Appendix E.
8.1 Pumps
Pumps are widely used for transfer of liquids from one place to another. Pumps are usually driven by
electric motors; thus some of the considerations about pumps and electric motors might overlap. For some
specific applications, pumps can be driven by compressed air or hydraulically.
There are many types of pumps used in industry depending on the including: centrifugal pumps
(used predominantly for transfer of large volumes), metering pumps (used for precise delivery of liquids to a
point of application and ensuring the constant discharge regardless of backpressure in the lines), and
progressive cavity pumps or peristaltic pumps (used for delivery of very viscous materials and others).
Pump manufacturer generally provide pump curves at the time of the sale. They are essential for
establishing the operation range and if any changes for pumping systems are considered the curves have to be
considered.
8.1.1 Operation
Opportunities for savings in pump operation are often overlooked because pump inefficiency is not
readily apparent. Pumps can run inefficiently for several reasons:
1. Present operating conditions differ from the design conditions. This change often occurs after a plant
has undertaken a water conservation program.
2. Oversized pumps were specified and installed to allow for future increases in capacity.
3. Conservative design factors were used to ensure the pump would meet the required conditions.
4. Other design factors were chosen at the expense of pump efficiency when energy costs were lower.
8.1.1.1 Pump Survey
A survey of pumps should concentrate on the following conditions associated with inefficient pump
operation. These are discussed in order of decreasing potential for energy savings in existing installations.
For the survey to produce worthwhile savings, only pumps above a certain size, such as 25 horsepower, need
to be checked:
1. Excessive pump maintenance. This problem is often associated with:
a. Oversized pumps that are heavily throttled.
b. Pumps in cavitation.
c. Badly worn pumps.
d. Pumps that are misapplied for the present operation.
2. Any pump system with large flow or pressure variations. When normal flows or pressures are less
than 75 percent of their maximum, energy is probably being wasted from excessive throttling, large
bypassed flows, or operation of unneeded pumps.
3. Bypassed flow. Bypassed flow, either from a control system or deadhead protection orifices, is
wasted energy.
4. Throttled control valves. The pressure drop across a control valve represents wasted energy, which is
proportional to the pressure drop and flow.
5. Fixed throttle operation. Pumps throttled at a constant head and flow indicates excess capacity.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 241
Notes
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Prime Movers of Energy: Pumps
JT , 6. Noisy pumps or valves. A noisy pump generally indicates cavitation from heavy throttling or excess
flow. Noisy control valves or bypass valves usually mean a high pressure drop with a corresponding
high energy loss.
7. A multiple pump system. Energy is commonly lost from bypassing excess capacity, running
unneeded pumps, maintaining excess pressure, or having a large flow increment between pumps.
8. Changes from design conditions. Changes in plant operating conditions (expansbns, shutdowns,
etc.) can cause pumps that were previously well applied to operate at reduced efficiency.
9. A low-flow, high-pressure user. Such users may require operation of the entire system at higher
pressure.
10. Pumps with known overcapacity. Overcapacity wastes energy because more flow is pumped at a
higher pressure than required.
Once the inefficient pumps have been identified, the potential savings and the cost of implementing
the changes should be analyzed. Comparison of the actual operating point with the pump performance curve
will facilitate the analysis. Actual performance may differ from the original design because of process
changes, faulty basic data, conservative safety margins, or planned expansions never realized.
8.1.1.2 Energy Conservation Measures
Energy may be saved in pump operation in a number of ways, including the following techniques
arranged in approximate increasing order of investment cost:
1. Shut Down Unnecessary Pumps-
This obvious but frequently overlooked energy-saving measure can often be carried out after a
significant reduction in the plant's water usage. If excess capacity is used because flow
requirements vary, the number of pumps in service can be automatically controlled by installing
pressure switches on one or more pumps.
2. Restore Internal Clearances-
This measure should be taken if performance changes significantly. Pump capacity and efficiency
are reduced as internal leakage increases from excessive backplate and impeller clearances and worn
throat bushings, impeller wear rings, sleeve bearings, and impellers.
3. Trim or Change Impellers-
If head is excessive, this approach can be used when throttling is not sufficient to permit the
complete shutdown of a pump. Trimming centrifugal pump impellers is the lowest cost method to
correct oversized pumps. Head can be reduced 10 to 50 percent by trimming or changing the pump
impeller diameter within the vendor's recommended size limits for the pump casing.
4. Control by Throttling-
Controlling a centrifugal pump by throttling the pump discharge wastes energy. Throttle control is,
however, generally less energy wasteful than two other widely used alternatives: no control and
bypass control. Throttles can, therefore, represent a means to save pump energy.
5. Replace Oversized Pumps-
Oversized pumps represent the largest single source of wasted pump energy. Their replacement
must be evaluated in relation to other possible methods to reduce capacity, such as trimming or
changing impellers and using variable speed control.
6. Use Multiple Pumps-
Multiple pumps offer an alternative to variable speed, bypass, or throttle control. The savings result
because one or more pumps can be shut down at low system flow while the other pumps operate at
high efficiency. Multiple small pumps should be considered when the pumping load is less than half
the maximum single capacity.
242 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Prime Movers of Energy: Pumps
1. Use a Small Booster Pump - -^ .
The energy requirements of the overall system can be reduced by the use of a booster pump to
provide the high-pressure flow to a selected user and allow the remainder of the system to operate at a
lower pressure and reduced power.
8. Change Pump Speed-
Variable-speed drives yield the maximum savings in matching pump output to varying system
requirements. However, variable speed drives generally have a higher investment cost than other
methods of capacity control. Several types of variable-speed drives can be considered:
• Variable-speed motors, either variable frequency or DC
• Variable-speed drives such as traction drives, for constant-speed motors
• Two-speed motors when low speed can satisfy the requirements for significant portion of the
time
As an example of the savings from the use of a smaller pump, assume 300 tons of refrigeration are
required during the summer months but only 75 tons for the remaining nine months. One of two 700-gpm
chilled-water pumps, equipped with 40-horsepower motors, is operated during the winter, with two thirds of
the flow bypassed. A new 250-gpm pump designed for the same discharge head as the original two units
consumes only 10 horsepower. The electric savings from operating the small pump during the winter is:
Annual Savings = (40 hp -10 hp) x 6,000 hrs/yr. x 9 months/12 months x $0.041/hp-hr = $5,540
The installation cost of a new pump is about $5,000.
The following example illustrates the possible savings from trimming an impeller. A double suction
centrifugal pump with a 13.75-inch diameter impeller pumps process water. The demand is constant (2,750
gpm) and the pump is controlled by a manual throttle valve. The pump operates at 164 feet head, 2,750 gpm
and 135.6 brake horsepower (point A in Exhibit 8.1). A 16 psig (37-foot) pressure drop occurs across the
partially closed throttle valve, with only a 6-foot drop across the completely open valve.
If the pump were exactly matched to the system requirements, only 127 feet of head would be
required without the valve. Because even the fully open valve has a 6-foot pressure drop, the minimum head
required becomes 133 feet. To this, a 5 percent allowance should be added as a tolerance for the accuracy of
the field measurements and impeller trimming. The minimum total head required is 140 feet. Based on the
pump affinity laws, the trimmed impeller diameter should be 13 inches, as shown in step 1 below.
With a trimmed 13-inch impeller, the pump will operate slightly throttled at 140-feet head, 2,750 gpm
and 115.7-brake horsepower, as shown by point B in Exhibit 8.1. The trimmed impeller reduces power
consumption by 19.9-brake horsepower and saves $5,440 per year (see steps 2-4). Trimming and balancing an
impeller usually cost less than $1,000, and payback, therefore, is less than three months.
1. Determine the impeller diameter needed to reduce the head from 164 feet to 140 feet and maintain
2,750-gpm flow. Apply the affinity laws noting that both the head and flow are reduced as the
impeller is trimmed
a. H1/H2=D12/D22andQ1/Q2=D1/D2 Hj Qj /H2 Q2 =Di3 /D23
b. Holding Q constant = Dj /D2 = (Hi /H2 )1/3 = (164 / 140)1/3 = 1.054
c. D! = (D2 / 1.054) = 13.0 inches
where,
H = head in feet; HI , before the reduction, and H2 , after the reduction
D = diameter of the impeller in inches
Q = flow in gpm
E = pump efficiency
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 243
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Prime Movers of Energy: Pumps
Notes
Exhibit 8.1: Typical Centrifugal Pump Characteristics
2. Point A: Oversized pump (13.75-inch impeller) throttle back to 2,750 gpm.
3. Point B: Trimmed impeller (13 inches) throttled back to 2,750 gpm.
bhp = (140 x 2,750) / (3,960 x 0.84) = 115.7
4. Annual Savings = 135.6 -115.7 = 19.9 bhp
$/yr = 19.9 x (1/0.90) motoreff. ' 6,000 hrs/yr ' $0.041/hp-hr = $5,440
As with other equipment, energy conservation for pumps should begin when the pump is designed.
Nevertheless, the savings from modification of an existing system often justify the cost.
The following example illustrates the application of affinity laws for variable frequency drive pump
savings. With fans the affinity laws can be applied directly because the system resistance is purely flow-
related. With pumps or fans having a static head offset, the system resistance curve also changes with pump
speed.
A typical centrifugal pump curve in Exhibit 8.2 shows that by throttling the 1,750 rpm motor the
pump delivers 2,500 gpm at 236 ft. head. Given a system analysis showing that 150 ft. of head is required to
deliver 2,500 gpm with no throttling, the savings for operating the pump at reduced speed without throttling
can be determined by the following trial-and-error method.
The affinity laws are:
Si / S2 = Qi / Q2 = (Hi /H2)1/3 = (BHP /BHP )1/3
where,
Si = original pump speed, rpm
S2 = new pump speed, rpm
Qi = flow on original pump curve, gpm
Q2 = system flow required, gpm
HI = head on original pump curve, ft.
H2 = head required by system for Q2, ft.
244
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Prime Movers of Energy: Pumps
BHPi = pump horsepower at Qi and HI
BHPi = pump horsepower required for operation at Q2, H2
1. Assume a new pump speed, try 1,500 rpm.
2. Calculate the speed ratio
Si/S2 = 1,500/1,700 = 0.8824
3. Calculate Qi from the affinity laws.
Qi = Q2 / (Si / S2) = 2,500/0.8824= 2,833 gpm
4. Determine HI from the original curve at Qi
HI =233 ft.
5. Calculate H2 from the affinity laws:
H2 = (S2/Si)3xHl
= 0.8824x233
= 205.6 ft.
6. Compare H2 from step 5 with the desired H2. Since H2 at 205.6 ft. is greater than the desired HI at
150 ft., the calculation must be repeated using a lower rpm. Several iterations of this procedure give:
Si = 1,405 rpm, Qi = 3,114 gpm, and HI = 232.5 ft.
From Q and HI above a new operating point 1 is determined. The important concept here is that
point 1 is not the original system operating point (2,500 gpm, 236 ft.). Rather it is the one and only
point on the original pump curve that satisfies the affinity law equations at the new operating point 2
(2,500 gpm, 150 ft.). It must be determined before BHP2 can be calculated from the affinity laws.
Exhibit 8.2: Centrifugal Pump Curve
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
245
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Notes
Prime Movers of Energy: Pumps
1. From the pump curve determine BHPi for Qj at 3,114 gpm.
BHP!=258
8. Calculate BHP2 using affinity law
BHP2=BHP! (S2/SO3
= 258 (1,405/1,750)3 = 258 x 0.5175
= 133.5 BHP
9. From the pump curve determine the actual BHP (BHPA) for the original operating point at 2,500
gpm.
BHPA = 230 BHP
10. Determine reduction in horsepower:
BHP savings = 230 -133.5 = 98.5 BHP
Note the savings are not found from BH?! -BHP2, BHPA-BHP2
These calculations can be performed for other types of pumps using the curves presented in Exhibits
8.3 - 8.5. Manual calculation of savings for variable speed drives will be tedious if they must be determined
for a number of conditions. Computer programs can simplify the task.
Exhibit 8.3: Typical Pump and System Curves, Driven by Adjustable Speed Drive
Curve. 1
Pump Curve, 2
246
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Prime Movers of Energy: Pumps
Exhibit 8.4: Typical Pump and System Curves for Pump with Throttling Valve
Sy&tem Curve
Throttled
Notes
Exhibit 8.5: Pump Power Requirements for Throttling and Adjustable Speed Motors
Q.
JC
Q.
CL
20
15
10
X
/
/
Adjustable
jSpeeet j
Method
! I
V
40%
1
1
1
©0%
Row
I
I
1
80% 1
(%)
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
247
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Prime Movers of Energy: Pumps
Notes
8.1.2 Considerations for Installation Design
The position of the pump with respect to the reservoir from which the liquid is to be taken is of
utmost importance. If the pump is higher than the tank from which the fluid is being pumped the boiling of
the fluid at local temperature can occur. The formation of the bubbles is called cavitation. The bubble
collapse can happen at the higher pressure region (tips of the impeller), thus causing "cavitation erosion."
This results in a very low pump and damage of the impeller will follow soon. In order to avoid cavitation in
the pump, the installation has to satisfy a condition of net positive suction head (NPSH). The manufacturer of
the pump supplies the net positive suction head required and that is the minimum pressure head at the inlet for
the type and model of the pump that has to be maintained in order to avoid cavitation inside the pump. The
net positive suction head required accounts for pressure drop inside the pump. The pressure head at the inlet
has to be calculated for each installation. Conventional tools for pressure losses in pipes are commonly used
and adequate. Since the occurrence of bubbles forming inside the housing of the pump is absolutely
forbidden, the backpressure of the system is of the same importance as NPSH. Adequate backpressure will
prevent the formation of bubbles and can be achieved, if not currently available, by installation of
backpressure valve.
Exhibit 8.6: Comparative Energy Usage with Various Methods of Control
Operating
Situation
Constant Operation
at Full Capacity
Single Speed Fan
Cycling
Two Speed Fan
Cycling
Variable Control at
Constant Speed
Variable Speed
Control
Hours of
Operation
1202.2
P = 765.3 (*)
B = 852.7
P=1132(*)
B=1146
1202.2
1202.2
Average kW
Usage
P=16.2
B = 32.4
P=16.2
B = 32.4
P = 4.3
B = 8.55
P = 2.72
B = 5.44
P=1.99
B = 3.98
Propeller Fan
Energy [kWh]
19475.6
12.397.9
4867.6
3270
2392.4
Blower Fan
Energy [kWh]
38951.2
27627.5
9798.3
6540
4704.8
*The propeller fan will operate slightly fewer hours in these modes because of the cross tower's cooling
effect with the fan off.
8.2 Fans
Fans provide the necessary energy input to pump air from one location to another while they
overcome the various resistances created by the equipment and the duct distribution system. Fans are
generally classified as either centrifugal fans or axial-flow fans, according to the manner of airflow through
the impeller. There are a number of subdivisions of each general type. The subdivisions consist of different
styles of impellers and the strength and arrangement of construction. Because the type of impeller dictates
fan characteristics, it influences the amount of energy (horsepower) the fan needs to transport the required
volume of air. The centrifugal fan has four basic types of impellers-airfoil, backward curved, radial, and
forward-curved. Exhibit 8.7 shows the nominal efficiency of the various types of fans at normal operating
conditions
248
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Prime Movers of Energy: Fans
Exhibit 8.7: Nominal Efficiency of Fans at Normal Operating Conditions
Notes
Type of Fan
Axial Fan
Centrifugal Fans
Airfoil Impellers
Backward -Curved Impeller
Radial Impeller
Forward -Curved Impeller
Efficiency %
85-90
75-80
70-75
60-65
55-60
Reductions in exhaust airflow are usually obtained by adjustment of dampers in the duct. Damper
control is a simple and low-cost means of controlling airflow, but it adds resistance, which causes an increase
in fan horsepower. Accordingly, if fan output is heavily throttled or dampered, the savings opportunity of
alternate methods of volume control should be investigated.
More efficient methods of volume control are to:
1. Install inlet vane control.
2. Reduce the speed of the fan.
3. Provide variable-speed control.
Exhibit 8.8 shows the reduction in horsepower realized by reducing fan speed.
Exhibit 8.8: Effect of Volume Control on Fan Horsepower
too
M
g
0 40
20
»
40 eo
Percent Volume
eo
100
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
249
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Prime Movers of Energy: Fans
Notes
Before alternate methods of volume control are considered, the condition of the existing fan and duct
system should be checked. Some factors that can reduce fan efficiency are:
1. Excessive static -pressure losses through poor duct configuration or plugging.
2. Duct leakage from poor joints or flange connections, access doors left open, damage or
corrosion, etc.
3. An improperly installed inlet cone, which inadequately seals the fan inlet area and allows
excessive air recirculation.
4. Excessive fan horsepower caused by poor fan maintenance, such as bad bearings, shaft
misalignment, worn impeller blades, or corroded fan housing.
5. Dirt and dust accumulations on fan blades or housing.
6. Buildup of negative pressure.
Once the existing system operates as efficiently as possible, alternate methods to control flow can be
evaluated.
8.2.1 Inlet Vane Control
Inlet vane control is the most commonly used device for automatic control of centrifugal or in-line
fan output after damper control. Prespinning as well as throttling the air prior to its entry into the wheel
reduces output and saves power. Fans must be of sufficient size to permit retrofitting; the wheel diameter
should be larger than 20 inches.
8.2.2 Reduced Speed
When fan output can be reduced permanently, an economical method is to change belt sheaves. A
slower-speed motor can also be used if the first approach is not suitable. A two-speed motor is another
alternative if the fan operates at low volume for a significant portion of the time but full capacity is still
required part-time.
As an example of the savings to be realized from a reduction in fan speed, assume the exhaust airflow
requirements have been reduced 50 percent on a 20-horsepower centrifugal fan. Reducing fan rpm 50 percent
by changing belt sheaves will halve fan output. Exhibit 8.8 shows a horsepower comparison of various
methods of centrifugal fan control for typical fans. A 50 percent reduction with an outlet damper requires 80
percent of rated power; with a slower-speed motor, only 25 percent of rated power is required. (Refer to the
variable speed control curve on the Exhibit.) Therefore:
Annual Savings = (20 hp x 80% - 20 hp x 25%) x 6,000 hrs/yr x $0.041/hp-hr = $2,700
The reduction in fan output will result in operation of the electric motor at less than rated capacity. If
the horsepower required at the reduced flow is less than about one third of rated horsepower, the potential
savings for substitution of a smaller motor should also be investigated.
8.2.3 Variable Speed
If fan output must be varied but operates at reduced capacity much of the time, a variable drive
should be evaluated. (See separate discussion on variable-speed drives.) Automatic variation of fan speed
through fluid or magnetic couplings or variable-speed motors has limited application because of the high
initial cost.
8.3 Air Compressors
Air compressors in manufacturing facilities are often large consumers of electricity. There are two
types of air compressors: reciprocating and screw compressors. Reciprocating compressors operate in manner
similar to that of an automobile engine. That is, a piston moves back and forth in a cylinder to compress the
air. Screw compressors work by entraining the air between two rotating augers. The space between the
augers becomes smaller as the air moves toward the outlet, thereby compressing the air.
250
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Prime Movers of Energy: Air Compressors
Screw compressors have fewer moving parts than reciprocating compressors have and are less prone
to maintenance problems. However, especially for older types of screw compressors, screw compressors tend
to use more energy than reciprocating compressors do, particularly if they are oversized for the load. This is
because many screw compressors continue to rotate, whereas reciprocating compressors require no power
during the unloaded state.
This section includes energy conservation measures for increasing outside air usage, reducing air
leakage around valves and fittings in compressor air lines, recovering air compressor cooling water, recovering
air compressor waste heat, pressure reduction, adding screw compressor, controls, compressor replacement,
and adding low-pressure blowers.
8.3.1 Waste Heat Recovery
For both screw and reciprocating compressors, approximately 60% to 90% of the energy of
compression is available as heat, and only the remaining 10% to 40% is contained in the compressed air. This
waste heat may be used to offset space heating requirements in the facility or to supply heat to a process. The
heat energy recovered from the compressor can be used for space heating during the heating season. The
amount of heat energy that can be recovered is dependent on the size of the compressor and the use factor.
The use factor is the fraction of the yearly hours that the compressor is used. For this measure to be
economically viable, the compressor should be located near the heat that is to be used.
Exhibit 8.9: Compressor Waste Heat Recovery: Costs and Benefits
Notes
Options1
Waste Heat
Recovery
Installed Costs
($)2
2,098
Energy Savings
(MMBtu/yr)
676
Cost Savings
($/yr)3
2,786
Simple Payback
(yr)
0.8
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 34%.
2. One example from the IAC database to further clarify the costs is as follows: The waste heat from a
75 hp screw compressor was used to heat the plant. The energy savings were 417 MMBtu/yr, the
cost savings were $2,594/yr, and the implementation cost was $1,530 - giving a simple payback of
seven months.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
8.3.2 Operating Pressure Reduction
Demand and energy savings can be realized by reducing the air pressure control setting on an air
compressor. In many cases, the air is compressed to a higher pressure than the air-driven process equipment
actually requires. By determining the minimum required pressure, one may find that the pressure control
setting on the compressor can be lowered. This is done by a simple adjustment of the pressure setting and
applies to both screw and reciprocating compressors. The resulting demand and energy savings depend on the
power rating of the compressor, the load factor, the use factor, the horsepower reduction factor, the current and
proposed discharge pressures, the inlet pressure, and the type of compressor. The power reduction factor is the
ratio of the proposed power consumption to the current power consumption base on operating pressure. The
inlet pressure is the air pressure at the air intake to the compressor, usually local atmospheric pressure. This
measure should only be considered when the operating pressure is greater than or equal to 10 psi higher than
what is required for the equipment (with exception to situations with extremely long delivery lines or high
pressure drops).
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
251
-------
Prime Movers of Energy: Air Compressors
Notes
Exhibit 8.10: Pressure Reduction: Costs and Benefits
Options1
Pressure
Reduction
Installed Costs
(S)2
864
Energy Savings
(MMBtu/yr)
187
Cost Savings
($/yr)3
2,730
Simple Payback
(yr)
1.0
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 48%.
2. One example from the IAC database to further clarify the costs is as follows: Reducing the air
pressure control setting on a 75 hp air compressor from 115 psig to 100 psig resulted in energy
savings of 22,500 kWh and cost savings of $l,180/yr. The implementation cost was $270, resulting
in a simple payback of three months.
3. The energy cost savings is based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
8.3.3 Elimination of Air Leaks
Air leaks around valves and fittings in compressor air lines may represent a significant energy cost in
manufacturing facilities. Sometimes up to 20% of the work done by the compressor is to make up for air
leaks. The energy loss as a function of the hole diameter at an operating pressure of 100 psi is shown in
Exhibit 8.11. When determining the energy savings from elimination of air leaks, the gage and the absolute
pressures are used in calculating the amount of air lost due to air leaks. The gage pressure is the system
pressure supplied by the compressor and the absolute pressure is the sum of the gage pressure and the
atmospheric pressure. A case study of this opportunity is presented in Appendix E.
Exhibit 8.11: Fuel and Air Losses Due to Compressed Air Leaks
Hole Diameter
[in]
3/8
1/4
1/8
1/16
1/32
Free Air Wasted
[ft3/yr] by a Leak of
Air at 100 psi
90,400,000
40,300,000
10,020,000
2,580,000
625,000
Energy Wasted
Per Leak
[kWh/h]
29.9
14.2
3.4
0.9
0.2
Source: National Bureau of Standards
Rule of Thumb—=5%-10% of total energy consumption
Exhibit 8.12: Leakage Reduction: Costs and Benefits1
Options1
Leak
Reduction
Installed Costs
($)2
934
Energy Savings
(MMBtu/yr)
230
Cost Savings
($/yr)3
3,540
Simple Payback
(yr)
0.3
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 79%.
2. One example from the IAC database to further clarify the costs is as follows: Repairing air leaks in a
compressed air system having air compressors of 150 hp, 60 hp and 25 hp-all operating at 110 psig-
252
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Prime Movers of Energy: Air Compressors
resulted in energy savings of 35,750 kWh and cost savings of $2,760/yr. The implementation cost
was $500.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
Equations for Air Flow, Power Loss, and Energy Savings
The volumetric flow rate of free air exiting the hole is dependent upon whether the flow is choked.
When the ratio of atmospheric pressure to line pressure is less than 0.5283, the flow is said to be choked (i.e.,
traveling at the speed of sound). The ratio of 14.7 psia atmospheric pressure to 129.7 psia line pressure is
0.11. Thus, the flow is choked. The volumetric flow rate of free air, \£ exiting the leak under choked flow
conditions is calculated as follows:
-^ .
Vf=
where
Vf = volumetric flow rate of free air, cubic feet per minute
NL = number of air leaks, no units
Tj = temperature of the air at the compressor inlet, °F
PI = line pressure at leak in question, psia
P! = inlet (atmospheric) pressure, 14.7 psia
64 = isentropic sonic volumetric flow constant, 28.37 ft/sec-°R0.5
Cs= conversion constant, 60 sec/min
Q = coefficient of discharge for square edged orifice , 0.8 no units
7i = Pythagorean constant, 3.1416
D = leak diameter, inches (estimated from observations)
C6 = conversion constant, 144 in2 /ft2
TI = average line temperature, °F
The power loss from leaks is estimated as the power required to compress the volume of air lost from
atmospheric pressure, P;, to the compressor discharge pressure, P0, as follows :
Pt x C6 x V x
k
x NxC7 x
L=
where
F x F
^a A '-'m
L = power loss due to air leak, hp
k = specific heat ratio of air, 1 .4, no units
N = number of stages, no units
Cv = conversion constant, 3.03 x 10-5 hp-min/ft-lb
P0 = compressor operating pressure, psia
Ea = air compressor isentropic (adiabatic) efficiency, no units
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
253
-------
Prime Movers of Energy: Air Compressors
JT , Eg = 0.88 for single stage reciprocating compressors
Eg = 0.75 for multi-stage reciprocating compressors
Ea = 0.82 for rotary screw compressors
Eg = 0.72 for sliding vane compressors
Eg = 0.80 for single stage centrifugal compressors
Eg = 0.70 for multi-stage centrifugal compressors
Ea = 0.70 for turbo blowers
Eg = 0.62 for Roots blowers 3
£„, = compressor motor efficiency, no units
The annual energy savings, ES, are estimated as follows:
ES = L x H x C8
where
H = annual time during which leaks occurs, h/yr
C8 = conservation factor, 0.002545 MMBtu/hp-h
The annual cost savings, CS, can be calculated as follows:
CS = ESx unit costof eletricity
Quantifying air leaks is relatively simple if the system can be shut down for 10 to 15 minutes and if
there is an operating pressure gage in the system.
It is a good idea to ask plant personnel to shut down their compressors briefly (and close a valve near
the compressor if the compressor begins to relieve the system pressure through and automatic bleed). It is
important to assure that there are no plant processes taking air from the system at the time of this test—the
only thing relieving the pressure should be leaks. If there is not an operating plant pressure gage in the
system, a cheap one and a collection of bayonet fittings should be at hand so the gage can be attached to the
end of one of the plant's supply hoses.
One should monitor the pressure decay as a function of time for about a 10 psi drop and then
measure the sizes of the major receivers/accumulators and major air headers. The pressure drop test never
takes more than 15 minutes, and usually less. Measuring the size of major receivers and air lines is a short
job for an experienced student. Small lines (1.5 inch or less) can be ignored an leaving them out makes the
result conservative.
Application of the perfect gas law will yield the leak rate in scfm. Then one can turn to a reference
like the DOE/C/40520-TZ by Varigas Research to get compressor hp required per scfm. It is possible to
correct the 100 psig data there to other pressures.
This is a much better procedure than listening for leaks and 'quantifying' them by ear as to such
things as 'roar', 'gush', 'whisper', etc. because the leak rate is reasonably quantified in a conservative way. It
has the disadvantage of leaving the Assessment Team clueless about the cost of repair, which must then be
estimated. It is a good practice to listen for the big leaks and to try to see what is causing them to aid in
eliminating costs.
This procedure, along with a couple of other common projects is covered in two recent publications:
"Five Common Energy Conservation Projects in Small- and Medium-Sized Industrial Plants," 15th
National Industrial Energy Technology Conference," Houston, TX, March, 1993, by Darin W. Nutter,
Angela!. Britton, and WarrenM. Heffington, pp. 112-120.
254 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Prime Movers of Energy: Air Compressors
The same article was rewritten for Chemical Engineering. The reference is:
"Conserve Energy to Cut Operating Costs," Chemical Engineering, September, 1993, pp. 126- 137,
same authors.
8.3.4 Cooling Water Heat Recovery
Air compressors, 100 hp and larger, are often cooled by water from a cooling tower. The temperature
of the water after leaving the cooling coils of the compressor may be sufficiently high that heat can be
extracted from the water and used in a process. For example, boiler feed water could be preheated by using
waste heat from water used to cool the compressor. Preheating make-up water displaces boiler fuel that would
ordinarily be used to heat the make-up water.
Exhibit 8.13: Waste Water Heat Recovery: Costs and Benefits
Notes
Options1
Water Waste
Heat
Recovery
Installed Costs
($)2
16,171
Energy Savings
(MMBtu/yr)
3,306
Cost Savings
($/yr)3
14,676
Simple Payback
(yr)
1.1
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database and represent HOT
waste water rate for this measure was 41%.
2. One example from the IAC database to further clarify the costs is as follows: Installing a heat
exchanger to recover heat from waste water to heat-incoming city water resulted in energy savings of
145 MMBtu/yr, cost savings of $777/yr, and an implementation cost of $2,600, giving a simple
payback of 3.4 years.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
8.3.5 Compressor Controls
Screw compressors may consume up to 80% of their rated power output when they are running at less
than full capacity. This is because many screw compressors are controlled by closing throttling valves. The
inlet throttling valve on a typical throttled-inlet, screw-type compressor is partially closed in response to a
reduced air system demand. The pressure rise across the compression portion of the unit does not decrease to
zero, and thus power is still required by the unit. Accordingly, an older unit will continue to operate at 80% to
90% and a new unit at 40% to 60% of its full load capacity horsepower. When several screw-type air
compressors are being used, it is more efficient to shut off the units based on decreasing load than to allow the
units to idle, being careful not to exceed the maximum recommended starts/hour for the compressor. Modular
systems that conserve energy by operating several small compressors that are brought on-line as needed
instead of operating one large compressor continuously are often found in retrofit and new installations.
Exhibit 8.14: Screw Compressor Controls: Costs and Benefits
Options 1
Modify
Screw
Compressor
Controls
Installed Costs
($)2
3,463
Energy Savings
(MMBtu/yr)
342
Cost Savings
($/yr)3
5,074
Simple Payback
(yr)
0.7
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 48%.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
255
-------
Prime Movers of Energy: Air Compressors
Notes
2. One example from the IAC database to further clarify the costs is as follows: Installing controls on a
100 hp compressor resulted in energy savings of 128,600 kWh and a cost savings of $6,750/yr, at an
implementation cost of $1,500.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
8.3.6 Outside Air Usage
The amount of work done by an air compressor is proportional to the temperature of the intake air.
Less energy is needed to compress cool air than to compress warm air. On average, outside air is cooler than
in inside a compressor room. This is often the case even on very hot days. Piping can often be installed so
that cooler outside air can be supplied to the intake on the compressor. This is particularly simple and cost-
effective if the compressor is located adjacent to an exterior wall.
The energy and cost savings are dependent on the size of the compressor, the load factor, and the
number of hours during which the compressor is used. The load factor is the average fraction of the rated
load at which the compressor operates. The payback period is nearly always less than two years. The load
factor is fairly constant for compressors that operate only when they are actually compressing air. Most
reciprocating compressors are operated in this manner. When on, they operate with fairly constant power
consumption, usually nearly equal to their rated power consumption; when they are cycled off, the power
consumption is zero. Screw compressors are often operated in a different manner. When loaded (i.e.,
actually compressing air), they operate near their rated power, but when compressed air requirements are met,
they are not cycled off but continue to rotate and are "unloaded." Older screw compressors may consume as
much as 85% of their rated power during this unloaded state. Therefore, if a screw compressor is to be
operated continuously, it should be matched closely to the compressed air load that it supplies. Often, plant
personnel purchase compressors having several times the required power rating. This may be done for a
variety of reasons, but often in anticipation of expansion of the facility and a commensurate increase in the
compressed air requirements.
Exhibit 8.15: Outside Air Usage: Costs and Benefits
Options1
Outside Air
Usage
Installed Costs
($)2
593
Energy Savings
(MMBtu/yr)
82
Cost Savings
($/yr)3
1,246
Simple Payback
(yr)
0.5
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 52%.
2. One example from the IAC database to further clarify the costs is as follows: Supplying outside air
to the intakes of three air compressors (100 hp, 75 hp, and 50 hp) resulted in energy and cost savings
of 10,050 kWh and $4907 yr. The implementation cost was $780.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
8.3.7 Compressor Replacement
It is often advantageous to install a smaller compressor to more closely match the compressed air
requirements normally met by oversized or large compressors, for processes that have periods of low
compressed air usage. A smaller compressor will reduce energy usage and associated costs because the
smaller compressor will operate at a better efficiency than the larger compressor when air requirements are
low. Generally pre-1975 stationary screw-type compressors, if oversized for the load, will run unloaded
much of the time when the load is low. They are unloaded by closing the inlet valve and hence are referred to
as modulating inlet type compressors. Based on manufacturers' data, these compressors can consume as
much as 85% of the full load horsepower when running unloaded. Some pre- and post-1975 compressor
manufacturers have developed systems that close the inlet valve but also release the oil reservoir pressure and
256
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Prime Movers of Energy: Air Compressors
reduce oil flow to the compressor. Other strategies have also been developed but are not usually found on
older (pre-1975) screw-type compressors. The unloaded horsepower for screw compressors operating with
these types of systems typically ranges from 80% to 90% of the full load horsepower for older compressors
and from 40% to 60% for newer compressors, depending on the particular design and conditions. In any event,
if the compressed air requirements are reduced during particular periods (such as a third shift), but are not
eliminated entirely, then installing a smaller compressor to provide the air requirements during these periods
can be cost-effective.
Exhibit 8.16: Optimum Sized Equipment: Costs and Benefits
Options1
Compressor
Replacement
Installed Costs
($)2
11,826
Energy Savings
(MMBtu/yr)
975
Cost Savings
($/yr)3
9,828
Simple Payback
(yr)
1.2
Notes
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 39%.
2. One example from the IAC database to further clarify the costs is as follows: A manufacturer of
computer peripheral equipment replaced a 200 hp air compressor with a 75 hp air compressor. The
energy savings were $61,850 kWh and the cost savings were $2,725. The implementation costs were
$4,000.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
8.3.8 Low-Pressure Blowers
Compressed air is sometimes used to provide agitation of liquids, to control vibration units for
material handling (as air lances), and for other low-pressure pneumatic mechanisms. For such purposes, it is
more efficient to use a blower to provide the required low-pressure air stream. Use of low-pressure air from
the blower would reduce energy consumption by eliminating the practice of compressing air and then
expanding it back to low pressure for use.
Exhibit 8.17: Reduce Compressed Air Usage: Costs and Benefits1
Options1
Low
Pressure
Blowers
Installed Costs
($)2
3,023
Energy Savings
(MMBtu/yr)
404
Cost Savings
($/yr)3
5,677
Simple Payback
(yr)
0.5
1.
2.
Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 54%.
One example from the IAC database to further clarify the costs is as follows: A plating facility added
a low pressure blower. The energy savings were $41,000 kWh/yr and the cost savings were
$3,200/yr. The implementation cost was $5,000.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
8.3.9 General Notes on Air Compressors
1. Screw units use 40-100% of rated power unloaded.
2. Reciprocating units are more efficient, more expensive.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
257
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Prime Movers of Energy: Air Compressors
JT , 3. About 90% of energy consumption becomes heat (10%).
4. RULE OF THUMB: Roughly 20 hp per 100 cfm @ 100 psi.
5. Synchronous belts generally are not appropriate (cooling fins, pulley size).
6. Use low pressure blowers vs. compressed air whenever possible (agitation, heat guns, pneumatic
transfer, etc.).
7. Cost of air leaks surprisingly high.
8. Second, third, weekend shifts may have low air needs that could be served by smaller compressor.
9. Outside air is cooler, denser, easier to compress than warm inside air.
10. Using synthetic lubricants can reduce friction.
11. Older compressors are driven by older, less efficient motors.
12. Compressors may be cooled with chilled water or have reduced condenser capacity.
REFERENCES
1. Compressed Gas Association, Handbook of Compressed Gases, Reinhold, 1966
2. White, F.G, Industrial Air Compressors, Foulis, 1967
3. Janna, W.S., Introduction to Fluid Mechanics, PWS Publishing Company, 1993
4. Wolanski, W., Negoshian, J., and Henke, R., Fundamentals of Fluid Power, Houghton Miffin, 1977
5. Anderson B., The Analysis and Design of Pneumatic Systems, John Wiley and Sons, 1967
7. Fluid Power Handbook and Directory, Hydraulics And Pneumatics, 1994
8. Marks' Standard Handbook for Mechanical Engineers, McGraw-Hill, 1987
9. Vacuum and Pressure Systems Handbook, Gast Manufacturing Corporation, 1986
10. A.H. Shapiro, The Dynamics and Thermodynamics of Compressible Fluid Flow, Vol 1, Ronald Press,
NY, 1953, p. 100.
11. Chapters 10 and 11, Compressed Air and Gas Handbook, Fifth Edition, Compressed Air and Gas
Institute, New Jersey, 1989.
12. Varigas Research, Inc., Compressed Air Systems, A Guidebook on Energy and Cost Savings, Timonium,
MD, 1984.
13. National Technical Information Service, Compressed Air Systems, A Guidebook on Energy and Cost
Savings, #DOE/CS/40520-T2, March 1984.
14. American Consulting Engineers' Council, Industrial Market and Energy Management Guide, SIC 32,
Stone, Clay and Glass Products Industry, Washington, D.C. 1987, P. 111-30.
15. Turner, et. al, Energy Management Handbook, John Wiley and Sons, New York, NY, 1982, pp. 424-
425.
16. Witte, L.C., P.S. Schmidt, D.R. Braun, Industrial Energy Management and Utilization, Hemisphere
Publishing Corp., Washington, D.C., 1988, pp. 433 - 437.
17. Baumeister, T., L.S. Marks, eds., Standard Handbook for Mechanical Engineers, 7th Edition, McGraw-
Hill Book Co., New York, NY, 1967, pp. 14.42 - 14.61.
258 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Thermal Applications: Cooling Systems
CHAPTER 9. THERMAL APPLICATIONS
This chapter discusses thermal applications and equipment such as cooling towers, adsorption refrigeration,
mechanical refrigeration, and insulation. A description of each application and equipment, its general uses,
operation, and common opportunities for energy conservation are presented.
9.1 Cooling Systems
For process cooling it is always best from the standpoint of energy conservation to use the lowest
form of energy first. That is, for a piece of equipment or a process that is air cooled, first use outside air (an
economizer) if the outside air temperature is low enough. The next step, in appropriate climates, would be to
use direct evaporative cooling. This is a process in which air passing through water droplets (a swamp
cooler) is cooled, as energy from the air is released through evaporation of the water. Evaporative cooling is
somewhat more energy intensive than the economizer but still provides some relatively inexpensive cooling.
The increase in energy use is due to the need to pump water. Indirect evaporative cooling is the next step up
in energy use. Air in a heat exchanger is cooled by a second stream of air or water that has been
evaporatively cooled, such as by a cooling tower and coil. Indirect evaporative cooling may be effective if
the wet-bulb temperature is fairly low. The wet-bulb temperature is the temperature indicated by a
thermometer for which the bulb is covered by a film of water. As the film of water evaporates, the bulb is
cooled. High wet-bulb temperatures correspond to higher air saturation conditions. For example, dry air has
the ability to absorb more moisture than humid air, resulting in a lower, wet-bulb temperature.
Indirect evaporative cooling involves both a cooling tower and swamp cooler, so more energy will
be used than for the economizer and evaporative cooling systems because of the pumps and fans associated
with the cooling tower. However, indirect cooling systems are still less energy intensive than systems that
use a chiller. The final step would be to bring a chiller on line.
Many plants have chillers that provide cooling for various plant processes. Chillers consist of a
compressor, an evaporator, an expansion valve, and a condenser. Chillers are classified as reciprocating
chillers, screw chillers, or centrifugal chillers, depending on the type of compressor used. Reciprocating
chillers are usually used in smaller systems (up to 25 tons [88 kW]) but can be used in systems as large as 800
tons (2800 kW). Screw chillers are available for the 80 tons to 800 tons range (280 kW to 2800 kW) but are
normally used in the 200 tons to 800 tons range (700 kW to 2800 kW). Centrifugal chillers are available in
the 200 tons to 800 tons range and are also used for very large systems (greater than 800 tons [2800 kW]).
The evaporator is a tube-and-shell heat exchanger used to transfer heat to evaporate the refrigerant. The
expansion valve is usually some form of regulating valve (such as a pressure, temperature, or liquid-level
regulator), according to the type of control used. The condenser is most often a tube-and-shell heat exchanger
that transfers heat from the system to the atmosphere or to cooling water.
This section contains information pertaining to cooling systems, particularly chiller systems. Refer to
Brief #4 "Outside Air Economizers," Brief #5, "Evaporative Cooling," Brief #6, "Cool Storage," and Bnef #7,
"Heat Recovery from Chillers" in DSM Pocket Guidebook, Volume 2: Commercial Technologies for
information relating to cooling systems that may be found in industry. Topics discussed in this section
include condenser water and chilled water temperature reset at the chiller, hot-gas defrost of chiller
evaporator coils, and two-speed motors for cooling tower fans.
9.1.1 Cooling Towers
The most common types of cooling towers dissipate heat by evaporation of water that is trickling
from different levels of the tower. Usually the water is sprayed into the air, so the evaporation is easier.
Cooling towers conserve water, prevent discharge of heated water into natural streams and also avoid treating
large amount of make-up water. The wet-bulb temperature should not exceed the maximum expected
temperature, which occurs in the summer. In the past, most cooling towers were atmospheric. They relied on
natural air circulation, making them not very efficient in their cooling capacity. In addition, high pumping
heads were required to force the water to a certain height and let it run down on the system of platforms after
spraying. The spray losses were substantial and make-up water was required in significant amounts. Exhibit
9.1 gives an example of two types of towers and their energy requirements.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 259
Notes
-------
Thermal Applications: Cooling Systems
Notes
Three types of towers are widely used today. Mechanical forced-draft towers (see Exhibit 9.2),
induced draft towers (see Exhibit 9.3) and hyperbolic. Mechanical forced-draft is designed to provide an air
supply at ground level and at amounts that are easily controlled by fans. Unfortunately, there are some
problems with this design as well. Firstly, it is a non-uniform distribution of air over the area.
Exhibit 9.1: Comparison of F.D. Blower Tower vs. Propeller Tower for 400 Tons
Cooling
Tower Type
Counter flow
with Blower
Crossflow
w/Propeller
Operating
Fan Motor
(hp)
40
20
Fan Motor
kW1
32.4
16.2
Tower Pump
Head
ft2
23
10
Additional
Pump Motor
kW3
6.9
3.0
Total
Operating
kW
39.3
19.2
1. Fan and pump motor efficiencies assumed to be 92%.
2. That portion of total pump attributable to the cooling tower; sum of static lift plus losses in
tower's internal water distribution system.
3. Pump efficiency assumed to be 82%.
Exhibit 9.2: Mechanical Forced-Draft Cooling Tower
Water
Sprays
Water
Out
Secondly, the vapor is recirculated from the discharge into the inlet causing ice formation on the
blades of draft fans, when the temperatures drop low enough in the winter months. Thirdly, the physical
limitations of the fan size might prove a problem.
In case of induced-draft towers the fan mounted on the top of the roof. This arrangement
improves air distribution and less make-up water is needed. The hyperbolic tower is based on the
chimney effect. The effect of the chimney eliminates the need for fans that are necessary for both
induced-draft and mechanical forced-draft cooling towers. If the tower is of a substantial height, above
260
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Thermal Applications: Cooling Systems
250 feet, the tower orientation should be with the broad side to the winds that are prevailing in the region.
Shorter towers should have long axis parallel to the prevailing winds.
Notes
Water »
Exhibit 9.3: Induced Draft Cooling Tower
Air Out f Wats? Li-
Exhibit 9.4: Free Cooling/Air Preheat
Qytside
Air
40
Heated Air
45
Exchanger
501=
Chiliad
Water
System
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
261
-------
Thermal Applications: Cooling Systems
Notes
Exhibit 9.5: Indirect Free Cooling Loop
Coding To
1
"-<-«—•<"
1
54 SF ^
i
c
_if"~
-
flflt
\
„_
y
»ur
8P
—
nc
•n)
e
rt
ft
a
s
e
,1
^«&.
H
«
-"•*•
! I
E
V
a
I
r
/
^
_^_*!'
^-»j|
,,,,^»,^ ___,
i i
»
Oi»'at«M» a? ?5-i Loac
Itemperalures typical)
^_^^_.
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i 1 Cooling
n I Coii L03Q
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Exhibit 9.6: Free Cooling (Water Side Economizer) Define Operating Conditions
Comfort Cooling Data
Processing
Total Load
Peak Load Design Conditions
700 Tons
SOOTons
1000 Tons
Flow Rate
Returning Temperature
Leaving Temperature
2400 GPM
55°F
45°F
Off Season Design
Conditions
200Tons
300 Tons
500 Tons
Alternate
Number 1
1200 GPM
60°F
SOT
Alternate
Number 2
2400 GPM
60°F
55°F
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Thermal Applications: Cooling Systems
9.1.2 Typical Performance Improvements
The improvements in the area of cooling water are listed in this section. The thorough
understanding of the operation and knowing all local conditions (temperatures, prevailing winds etc.) are
the key for being able to make a valuable contribution.
9.1.2.1
Condenser Water Temperature Adjustment
The power consumption of any chiller increases as the condensing water temperature rises.
Condensing water is water that has been cooled in a cooling tower to be used to condense vaporized
refrigerant in the condenser. This is because, as the condenser temperature increases, the pressure rise
across the compressor increases and, consequently, the work done by the compressor increases.
Condensing water temperature set points are typically in the range between 65°F and 85°F, but can be as
low as 60°F. In many cases the setpoint temperature is in the middle of the range, at abou
of thumb is that there is a 0.5% improvement in chiller efficiency for each degree Fahrenheit decrease in
the setpoint temperature for the condenser water. The improvement tends to be higher near the upper
range of setpoint temperatures and decreases as the setpoint temperature decreases. The amount of
allowable decrease in the setpoint temperature must be determined by a detailed engineering analysis.
This analysis should include the following: the system capacity, minimum requirements for the plant
process served by the condenser water system, and number of hours per year that the wet bulb
temperature is below a given value.
Exhibit 9.7: Condenser Water Supply Temperature Reset: Costs and Benefit
Options1
Condenser
Installed Costs
($)2
2,678
Energy Savings
(MMBtu/yr)
489
Cost Savings
($/yr)3
6,217
Simple Payback
(yr)
0.4
Notes
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values
are averages based on the database data. The implementation rate for this measure was 67%.
2. One example from the IAC data base to further clarify the costs is as follows: Resetting the
condenser water temperature an electronics plant resulted in energy and cost savings of 58,218
kWh/yr and $2,390/yr. The implementation cost was $200.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the
center, which are usually almost identical to actual savings reported from the facility.
9.1.2.2
Chilled Water Supply Temperature Adjustment
The efficiency of chillers increases as the chilled water temperature increases. This is because,
in order to obtain lower chilled water temperature, the refrigerant must be compressed at a higher rate,
which in turn increases the compressor power requirements and decreases the efficiency of the chiller.
There is approximately a 1% increase in efficiency for each degree Fahrenheit increase in the chilled
water setpoint temperature. The efficiency increase tends to be higher near the lower temperatures in the
setpoint range and decreases as the setpoint temperature increases. The amount of allowable increase
must be determined by a detailed engineering analysis that evaluates the load requirements from the
chiller, the design chilled water temperature, and other aspects of the system. It is not uncommon to find
chilled water setpoints that are lower than is required from industrial chillers.
Exhibit 9.8: Chilled Water Supply Temperature Reset: Costs and Benefits
Options1
Condenser
Water Supply
Temp Reset
Installed Costs
($)2
766
Energy Savings
(MMBtu/yr)
384
Cost Savings
($/yr)3
4,449
Simple Payback
(yr)
0.2
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Thermal Applications: Cooling Systems
Notes
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values
are averages based on the database data. The implementation rate for this measure was 57%.
2. One example from the IAC data base to further clarify the costs is as follows: Resetting the
chilled water temperature in a manufacturing plant resulted in energy savings of 39 MMBtu/yr,
a cost savings of $537/yr, and no implementation cost, thus giving an immediate payback.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the
center, which are usually almost identical to actual savings reported from the facility.
9.1.2.3 Variable Speed (or Two-Speed) Motors for Cooling Tower Fans
Cooling tower performance is affected by the outdoor wet-bulb temperature. Higher wet-bulb
temperatures correspond to higher air saturation temperatures. As air loses the ability to extract heat
from water droplets flowing through a cooling tower (increasing wet-bulb temperature), a higher air flow
rate is required to remove the desired amount and reduce the condenser water to the design temperature.
The cooling water fan motor is often sized to perform under design conditions (i.e., full water flow rate at
maximum air flow rate and design wet-bulb temperature). During periods of lower outdoor wet-bulb
temperature, the design amount of cooling can be obtained with lower air flow rates. As the air flow rate
decreases, the fan speed and the motor power requirements also decrease. It may then be beneficial to
install a two-speed motor for the cooling tower fan to reduce the fan motor power consumption. Two-
speed motors may be part of new or retrofit construction. Savings for the addition of a two-speed fan
motor are estimated based on the number of hours per year that the wet-bulb occur at various temperature
ranges between design wet-bulb and minimum wet-bulb temperatures and the power requirements for
various air flow rates. It should also be noted that variable speed drives for fan motors achieve cooling
tower energy savings in the same manner as two-speed motors.
Exhibit 9.9: Two-Speed Motors on Cooling Tower Fans: Costs and Benefits1
Options1
Two Speed
Motors on
Cooling
Tower Fans
Installed Costs
(S)2
4,179
Energy Savings
(MMBtu/yr)
164
Cost Savings
($/yr)3
2,400
Simple Payback
(yr)
1.7
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database in 1994.
Today the database does not have a separate category for this item. The implementation rate for
this measure was 20%.
2. One example from the IAC data base to further clarify the costs is as follows: Installing two-
speed motors on the cooling towers at a plastic film extrusion plant resulted in energy and cost
savings of 58,335 kWh/yr and $2,680/yr. The implementation cost was $8,900.
3. The energy cost savings are based on actual dollar savings as reported to IAC from the facility
when compared to one-speed motors.
9.1.2.4 Hot Gas Defrost
Frost builds up on air cooler unit (freezer) evaporator coils when the unit operates at less than
32°F. Frost is the result of moisture in the air freezing to the coil as the air passes over the coil. The
performance of the coil is adversely affected by frost. Frost acts as an insulator and reduces the heat
transfer capability of the coil, and it restricts airflow through the coil. Frost buildup is unavoidable and
must be removed periodically from the coil.
One method of frost removal is to use the hot refrigerant discharge gas leaving the compressor.
During the defrost cycle, hot gas is circulated through the coil to melt the frost. Hot-gas defrost systems
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Thermal Applications: Cooling Systems
may be used for all cooling unit capacities and may be included in new or retrofit construction. For
retrofit applications, hot-gas defrost systems most often replace electric resistance defrost systems.
Using waste heat off the hot-gas side for defrost may result in savings on the order of 10% to 20% of the
total system usage.
Exhibit 9.10: Temperature vs. Time of Blower Operation
Notes
0 1000 ZQW 30» WOO 5000 6000 70W 8000 WOO
Hours
Exhibit 9.11: Evaporator Coils Defrost: Costs and Benefits
Options1
Hot Gas
Defrost
Installed Costs
($)2
9,750
Energy Savings
(MMBtu/yr)
489
Cost Savings
($/yr)3
6,656
Simple Payback
(yr)
1.4
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database All values are
averages based on the database data.
2. One example from the IAC database to further clarify the costs is as follows: Installing a hot-gas
defrost system in a dairy resulted in energy and cost savings of 20,500 kWh/yr. and $l,070/yr. The
implementation cost was $2,500.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almo st identical to actual savings reported from the facility.
9.2 Absorption Refrigeration
Packaged absorption liquid chillers are used to produce chilled liquid for air-conditioning and
industrial refrigeration processes. The chillers are usually powered by low-pressure steam or hot water,
which can be supplied by the plant boiler or by waste heat from a process.
Where prime energy is needed, mechanical refrigeration is usually preferable. The conditions that
favor the application of absorption refrigeration are the availability of a source of waste heat. Absorption
refrigeration may also have application in special situations, as for example a high electrical demand charge
with a ratchet clause in the rate schedule.
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Thermal Applications: Absorption Refrigeration
Notes
9.2.1 Operation
In the absorption cycle, two distinct chemicals are used and the cycle is driven by heat. The most
common absorption system fluids are water as the volatile fluid and lithium bromide brine as the absorber
fluid. Exhibit 9.12 illustrates the operation of a two-stage absorption chiller. Refrigerant enters the top of the
lower shell from the condenser section and mixes with refrigerant being supplied from the refrigerant pump.
Here the liquid sprays over the evaporator bundle. Due to the low vacuum (6 mm Hg) some of the refrigerant
liquid vaporizes, cooling the refrigerant water to a temperature that corresponds closely to the shell pressure.
Exhibit 9.12: Two-Stage Absorption Chiller
As the refrigerant vapor/liquid migrates to the bottom half of the shell, a concentrated solution of
liquid bromide is sprayed into the flow of descending refrigerant. The hygroscopic action between lithium
bromide (a salt with an especially strong attraction for water) and water-and the related changes in
concentration and temperature-result in the extreme vacuum in the evaporator directly above.
Dissolving lithium bromide in water also gives off heat that is removed by the cooling water. The
resultant dilute lithium bromide solution collects in the bottom of the absorber where it flows down to the
solution pump.
The dilute mixture of lithium bromide and refrigerant vapor is pumped through the heat exchangers,
where it is preheated by a hot, concentrated solution from the concentrators (generators). The solution then
flows to the first-stage concentrator where it is heated by an external heat source of steam or hot water. The
condenser water used in the absorber and the condenser is normally returned to a cooling tower.
The vapor is condensed in the second concentrator where the liquid refrigerant flows to the lower
shell and is once again sprayed over the evaporator. The concentrated solution of lithium bromide from the
concentrators is returned to the solution pump where it is recycled to the absorber.
The degree of affinity of the absorbent for refrigerant vapor is a function of the concentration and
temperature of the absorbent solution. Accordingly, the capacity of the machine is a function of the
temperature of the heat source and cooling water (see Exhibit 9.13).
Two-stage absorption requires higher water temperature or steam pressure, but because no additional
heat is required in the second concentrator, two-stage absorption machines are 30 percent to 40 percent more
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Thermal Applications: Absorption Refrigeration
efficient. However, two-stage absorption machines cost significantly more than single-stage absorption units
on an equal tonnage basis.
9.2.1.1 Capacity
Modern absorption refrigeration units range in capacity from about 100 tons to 1,600 tons for chilled
water service. Most ratings are based on a minimum chilled water outlet temperature of 40°F, a minimum
condenser water temperature of 70°F at the absorber inlet, and a generator steam pressure of 12 psig. Hot
water or hot process fluids can be used in lieu of steam for the generator; however, the fluid inlet temperature
must be at least 240°F for maximum capacity.
Exhibit 9.13: Capacity as Function of Temperature of Heat Source and Cooling Water
12-
to
2
I
-------
Thermal Applications: Absorption Refrigeration
Notes
Although absorption refrigeration machines are generally more difficult to operate and require more
maintenance than reciprocating and centrifugal machines, they allow waste stream to be utilized more
efficiently and in the proper application can result in substantial energy savings.
9.2.1.3 Direct-Fired Two-Stage Absorption Refrigeration
A recent development is the use of direct gas firing or waste heat as the energy source in lieu of
steam. The gas stream must be 550°F for use in this application. Possible sources are drying ovens, heat-
treating facilities, paint-baking ovens, process ovens, or any process which gives off a clean, high-
temperature exhaust gas. A special advantage of this unit is that it can be directly integrated into a packaged
cogeneration system.
Exhibit 9.14: Cost Comparison of Mechanical and Absorption Refrigeration
Mechanical Refrigeration
Typical hp required
Cost/ton-hr
Absorption Refrigeration
Typical Steam Required for single-stage
Cost/ton-hr
Typical steam required for two -stage
Cost/ton-hr
Typical gas required for direct-fired,
two -stage
Cost/ton-hr
= lhp/ton
=$0.041
=181bs@14psig/ton
=18 Ibs/hr x S4.01/M Ibs steam
= $0.072
=12 Ibs/hr @ 14 psig/ton
= 12 Ibs/hr x S4.01/M Ibs. Steam =$0.048
=13,OOOBtu/ton
=13,000 Btu/hrx $3.00/MMBtu
= $0.039
Exhibit 9.14 shows a cost comparison of mechanical vs. absorption refrigeration. The attractiveness
of absorption refrigeration depends on the relative cost of electricity and fuel if prime energy is used, or the
availability of waste heat, which requires no prime energy. With the unit costs selected for the manual, the
two-stage absorption is slightly more costly to operate than mechanical refrigeration. Where waste heat can
be utilized, absorption refrigeration is, of course, the obvious choice.
In considering the use of waste heat for absorption refrigeration, it is worth a reminder that the first
step should be to determine whether reducing or eliminating the waste heat is possible. A common
application is the use of absorption refrigeration to utilize steam vented to atmosphere. However, in most
cases a thorough study of the steam system will identify means of balancing the system to eliminate the loss
of steam.
9.3 Mechanical Refrigeration
Refrigeration machines provide chilled water or other fluid for both process aid air conditioning
needs. Of the three basic types of refrigeration systems (mechanical compression, absorption, and steam jet),
mechanical compression is the type generally used. The other two have application only in special situations.
Absorption refrigeration is discussed in the previous section. The energy requirements of the steam
jet refrigeration unit are high when compared with those for mechanical compression; therefore, the use of
steam jet refrigeration is limited to applications having very low cost steam at 125 psig, a low condenser
water cost, and a high electrical cost. With today's energy costs, this type of system is rarely economical.
9.3.1 Mechanical Compression
The mechanical compression refrigeration system consists of four basic parts; compressor,
condenser, expansion device, and evaporator. The basic system is shown in Exhibit 9.15. A refrigerant, with
suitable characteristics, is circulated within the system. Low-pressure liquid refrigerant is evaporated in the
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Thermal Applications: Mechanical Refrigeration
evaporator (cooler), thereby removing heat from the warmer fluid being cooled. The low-pressure refrigerant
vapor is compressed to a higher pressure and a correspondingly higher saturation temperature. This higher
pressure and temperature vapor is condensed in the condenser by a cooling medium such as cooling tower
water, river water, city water, or outdoor air. The higher pressure and temperature refrigerant liquid is then
reduced in pressure by an expansion device for delivery to the evaporator.
Exhibit 9.15: Mechanical Compression Refrigeration System
xpansion
Device
)
*
Condenser
Hot Gas -x i
^ \
(OphonaJ) \
^—^.A.
Fluid for
Condensing
,
Compressor
Evaporator
_Fiuid to
be Cooled
Notes
Reciprocating chiller compressors are generally used below 200 tons. Screw compressors are
generally economical in the 300- to 800-ton range but are available as low as 40 tons. Centrifugal units are
usually used for larger installations but are available in a broad range of capacities (75 to 5,000 tons or more).
Reciprocating compressors offer the lowest power requirement per ton of refrigeration. A typical
difference at 100-ton capacity is 1.00 kW/ton for a centrifugal versus 0.80 kW/ton for a reciprocating
machine. Although the reciprocating unit is more energy efficient, the savings are not sufficient to justify
replacement in a normal situation.
The characteristics of a centrifugal compressor make it ideal for air conditioning applications
because it is suitable for variable loads, has few moving parts, and is economical to operate. The power
requirement of the centrifugal compressor is about 0.75 kW/ton when 45°F chilled water is produced, and it
requires 3 gpm/ton of condenser water. Mechanical compressors are normally driven by an electric motor
although many installations utilize a steam turbine drive.
9.3.2 Methods to Reduce Costs
The ultimate users of the cooling system and the distribution system, as well as the refrigeration
machines, must operate the systems efficiently. The following steps will lead to the most energy-efficient
operation of the refrigeration system.
1. Use refrigeration efficiently.
2. Operate at the lowest possible condenser temp erature/pressure (lowest entering condenser water
temperature).
3. Operate at the highest possible evaporator temperature/pressure (highest leaving chilled-water
temperature); do not overcool.
4. Operate multiple compressors economically.
5. Recover heat rejected in the condenser.
6. Use a hot has bypass only when necessary.
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Thermal Applications: Mechanical Refrigeration
Notes
9.3.2.1 Use Refrigeration Efficiently
The most direct saving will obviously result from shutting down the equipment when refrigeration is
not required. Short of shutting down equipment, the refrigeration load may be reduced by ensuring the
cooling medium is utilized efficiently at the point of use. A typical problem is overcooling. Other
unnecessary losses are inadequate insulation or poor operating practices such as simultaneous heating and
cooling.
A reduction in refrigeration load will, of course, reduce the operation of the refrigeration machines,
including the associated pumps and cooling towers. Economizer cycles on air conditioning units will also
permit early shutdown of refrigeration machines. Refer to the HVAC section for details of economizer cycle
operation.
9.3.2.2 Reduce the Condensing Temperature (Pressure)
The most significant method to reduce compressor horsepower (aside from load reduction) is to
lower the condensing temperature (pressure). Typically, efficiency improves about 1.5 percent for each 1
degree decrease in refrigerant condensing temperature.
The pressure-enthalpy diagram Exhibit 9.16 illustrates how energy is conserved in the refrigerant
cycle (Carnot cycle). At point 1 the refrigerant liquid starts evaporating and absorbs heat from the cooling
load. At point 2 all of the liquid is evaporated and emerges as a vapor. Between point 2 and 3 mechanical
work is performed to compress the working fluid in the compressor. Between points 3 and 4, the vapor
passes to the condenser where heat is removed by the cooling water and the refrigerant returns to the liquid
state. Between points 4 to 1 the refrigerant experiences a drop in pressure induced by the expansion valve.
Lowering the condensing pressure lowers line 3- 4 to 3'-4', thereby reducing the load on the compressor.
Opportunities to reduce condensing temperature will exist when the cooling tower or air-cooled
condenser is operating at less than full capacity. Because the cooling tower or air-cooled condenser is
designed for summer conditions, excess capacity should exist in the winter. Rather than controlling to a
constant condensing temperature, the lowest possible temperature consistent with the capability of the
refrigeration system should be used. Although additional costs are incurred for cooling, these are more than
offset by the reduction in compressor horsepower. The condition of the cooling tower or air-cooled
condenser is also important for obtaining minimum temperature.
Exhibit 9.16: Pressure-Enthalpy Diagram
-- Condensing JHea: trrswisij ttym ^^ I.
^ rainperir.t -.n the csf;^^-ssff
Enthalpy
Although it is economical to operate at a lower-entering-condenser-water-temperature than the
design temperature, too low a condensing temperature reduces the pressure differential across the refrigerant
control (condensing pressure to vaporizing temperature), which reduces the capacity of the control and results
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Thermal Applications: Mechanical Refrigeration
in starving the evaporator and unbalancing the system. As a rule, the condenser temperature (refrigerant side)
should not be less than 75°F to 80°F, or less than 35°F above the refrigerant temperature in the evaporator.
The partial-load power requirements of a typical centrifugal refrigeration compressor at different
entering condenser water temperatures are shown in Exhibit 9.15.
The following example calculates the annual savings from reducing the condenser water
temperature. A 1,000-ton refrigeration compressor rated at 750 kilowatts at full load is operating at a 700-ton
load. The condenser water temperature is reduced from 85°F to 65°F during the five winter months.
Percent design Load = (700 ton actual load) / (1,000 ton design load) x 100 = 70%
From Exhibit 9.17, the percent of full load power at 70 percent design load is:
At 85°F condenser water, 65.5 percent
At 65°F condenser water, 60.0 percent
Input kW at 85°F condenser water = 750 x 65.6%
Notes
Input kW at 65°F condenser water
Savings
Annual Savings
= 491
= 750x60.0%
= 450
= 41kW
= 41 kW x 6,000 hrs/yr x 5 mos/12 x 0.05 $/kWh
= $5,130
Exhibit 9.17: Partial Load Requirement for Centrifugal Refrigeration Compressors
'-(SO
'JO
30 f
70
•80 f-
50
40
,4
-4-
-4-
43 SO .80
ce«l &f 0«ssif n io«il
Closely related to lower cooling water temperature is proper maintenance of the condensers.
Inadequate water treatment can lead to scaling which can decrease heat transfer through the heat exc hanger
tubes. A gradual increase in refrigerant temperature at constant load conditions is an early signal of
condenser tube fouling.
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Notes
9.3.2.3 Raise the Evaporator Temperature (Pressure)
An increase in evaporator temperature reduces the energy required by the refrigeration machine
because it must perform less work (reduced lift) per ton of refrigeration produced. The amount of energy
reduction depends on the type of refrigeration machine. For a centrifugal machine, the reduction is
approximately 1 to 1.5 percent for each degree the evaporator temperature increases at normal evaporator
temperatures for air conditioning.
As shown in Exhibit 9.16 increasing the evaporator temperature raises line 1-2 to l'-2', thereby
reducing the load on the compressor between points 2 and 3. The effect is the same as reducing the
compressor load by a reduction in condensing pressure (temperature) described in the previous method.
Consult the actual performance curve for the individual machine for a more accurate estimate of horsepower
reduction.
In some cases a higher evaporator temperature may not be possible if it is fixed by production
requirements. An opportunity to increase the evaporator temperature (chilled water temperature) will exist
when the flow of chilled water to the various users is throttled. The throttle condition indicates that less than
full design flow is required by the units to satisfy the load. The chilled-water temperature can be increased
until it reaches the point at which any single user is requiring close to full flow. The system temperature will
be controlled by the single user that first reaches full capacity.
While some saving in compressor power is obtained by increasing the leaving chilled-water
temperature, greater savings are possible with a centrifugal compressor by changing the compressor speed.
The reason is that, at a constant speed, closing the pre-rotation vanes on the compressor raises the chilled-
water temperature. This causes the reduction in power to be less than expected for the corresponding increase
in evaporating temperature. The speed change could be accomplished by changing gears; or if a variable
chilled-water temperature is appropriate, a variable-speed drive could be considered.
To find the savings from an increase in the chilled-water temperature from 45°F to 50°F, use the
following example. The refrigeration machine is rated at 1,000 tons and operates at an average load of 600
tons for five months per year.
Conditions: input = 412 kW; 1,800 gpm condenser water and condenser water flow does not change.
Annual Savings = 412 kW x (50°F - 45°F) x 1% x 6,000 hrs/yr. x 5 mos/12 x $0.05/kWh = $2,580
9.3.2.4 Operate Multiple Compressors Economically
If an installation has multiple refrigeration units, economic operation of these units can Educe
energy consumption. The operating characteristics of the compressors used will determine the most
economical mode of operation. The power requirements of reciprocating compressors make their operation
more efficient if one compressor is unloaded or shut down before a second compressor is unloaded. On the
other hand, the partial load requirements of a centrifugal compressor, as shown in Exhibit 9.17 make it more
economical to operate two compressors at equal partial load than one compressor at full load and the second
at low load. For example, it is more economical to operate two centrifugal compressors at 80 percent of
capacity than one at 100 percent and the second at 60 percent.
The same approach can be used in the assignment of refrigeration machines to cooling equipment. It
is important that the capacity of the refrigeration machine match the capacity of the cooling unit(s) it serves.
Therefore, in a system of multiple refrigeration machines and cooling units, care must be taken to assign the
refrigeration machines to the cooling units correctly.
Where two or more refrigeration machines supply separate chilled water systems and are located in
close proximity to each other interconnection of the chilled water systems can be considered. With this
modification, during periods of light loads one machine may be able to carry the load for more than one
system.
The following example illustrates the savings from operating two compressors equally loaded, based
on five months per year operation. One centrifugal compressor rated at 1,000 tons, 750 kilowatts, and 85°F
entering condenser water temperature is operating at a 900-ton load and 75°F entering condenser water. A
second 1,000-ton compressor is not running.
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From Exhibit 9.17 you can see the percent of full-load power at 75°F entering condenser water is: -^ .
At 90 percent design load, 84.0 percent
At 45 percent design load, 40.5 percent
Input kW at 900 tons =750kWx84%
= 630kW
Input kW (two units at 450 tons each)
= 750 kW x 40.5% x 2 compressors
= 608kW
Savings =22kW
Annual Savings = 22 kW x 6,000 hrs/yr. x 5 mos/12 x $0.05/kWh
= $2,750
9.3.2.5 Recover Heat
Heat rejected at refrigeration machine condensers can be considered for recovery. The amount of
heat rejected in the condenser is 12,000 Btu per hour plus the heat of compression is about 2,500 Btu/hr per
ton, giving a total heat rejection of about 14,500 Btu/hr per ton produced. The use of a split condenser
permits partial recovery of rejected heat. A split condenser uses two cooling water streams: a process stream
that is preheated in the first condenser and cooling tower water for the second condenser. The preheating of a
process stream reduces the heating load on the cooling tower. This heat recovery scheme is applicable only if
the plant can use a low temperature heat source.
In the following example, a mechanical compressor rated at 1,000 tons is operating five months a
year at an average 600-ton load. The savings from recovering 50 percent of the rejected heat to preheat water
now heated by a steam hot water heater are:
Heat Rejected = 600 tons x 14,500 Btu/ton-hr
= 8,700,000 Btu/hr
Annual Savings = 8,700,000 Btu/hr x 50% x 6,000 hrs/yr. x 5 mos/12 x $4.24 / 106 Btu
= $46,100
9.3.2.6 Reduce Operation of Hot-Gas Bypass
On mechanical refrigeration machines, the primary elements for load controls are the suction damper
or vanes, and the hot-gas bypass that prevents compressor surge at low loads. The suction vanes are used to
throttle refrigerant gas flow to the compressor within the area of stable compressor operation. As load or
flow drops, where it approaches the compressor surge point, the hot-gas bypass is opened to maintain
constant gas flow through the compressor. Below this load point for the hot-gas bypass, compressor flow,
suction, and discharge conditions remain fairly constant, so that power consumption is nearly constant.
Obviously, opening the hot-gas bypass too soon, or having a leaking hot-gas bypass valve, will increase
operating cost (kilowatts per ton).
It is not uncommon to find the bypass controls taken out of service, with the bypass set to maintain a
fixed opening and constantly recycle high-pressure refrigerant vapors to the suction side of the compressor.
A second frequent deficiency occurs when the hot-gas bypass is faulty or grossly oversized and is leaking. A
third source of energy loss is faulty load control, which can cause improper operation of the hot-gas bypass
valve. Considerable energy can be saved and capacity recouped if the defective hot-gas bypass valves and
their controls are corrected.
9.3.2.7 Optimize Refrigeration Performance
The most basic approach to reducing refrigeration costs is to ensure that the refrigeration units are
operating at maximum efficiency. To monitor performance, each refrigeration machine must have proper
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Thermal Applications: Mechanical Refrigeration
Notes
instrumentation. This instrumentation includes flow meters for both the chilled water and the condenser
water, pressure gauges at the inlet and outlet of both the condenser and evaporator, and temperature wells in
both the inlet and outlet of the condenser and the evaporator. These temperature wells should be located in
such a manner that a liquid can be placed in the well. The temperature measuring device used to test the
equipment should read accurately to one-tenth of a degree.
9.4 Insulation
Although not generally viewed as a part of the mechanical design system, insulation is an important
part of every piece of equipment or building where any transfer of fluids or gases takes place and the their
temperature is required to be different then that of ambient air. Properly insulated pipes, tanks and other
equipment can save thousands of dollars.
There are several opportunities in the industrial sector to realize energy savings by installing
insulation in manufacturing facilities. Good insulation design and installation are very important in terms of
performance and energy efficiency. It is essential to determine the most appropriate type and thickness of
insulation for specific applications. The most cost-effective approaches involve insulating pipes and tanks.
These opportunities are described in this section.
9.4.1 Insulation of Pipes
Every facility has piping of some type to carry fluids and gases to the place of use. Most often these
pipes carry hot and cold water used for restrooms and kitchen facilities. In industrial applications piping is
used to transfer steam, hot water, and chilled water to various manufacturing applications. Insulating the
pipes can reduce energy loss during transfer of these fluids and gases. Illustrations of the potential energy
savings from insulation of piping are given below.
Exhibit 9.18: Recommended Thickness for Pipe and Equipment Insulation
Nominal
Size (in)
1
1.5
2
3
4
6
8
Pipe
Thickness
Heat Loss
Surface Temp
Thickness
Heat Loss
Surface Temp
Thickness
Heat Loss
Surface Temp
Thickness
Heat Loss
Surface Temp
Thickness
Heat Loss
Surface Temp
Thickness
Heat Loss
Surface Temp
Thickness
Heat Loss
Surface Temp
Process Temperature ('F)
150
1
11
73
1
14
73
1.5
13
71
1.5
16
72
1.5
19
72
2
21
71
2
26
71
250
1.5
21
76
2
22
74
2
25
75
2.5
28
74
o
3
29
73
3
38
74
3.5
42
73
350
2
30
78
2.5
33
77
o
3
24
75
3.5
39
75
4
42
74
4
54
75
4
65
76
450
2.5
41
80
3
45
79
3.5
47
77
5
54
77
4
63
78
4
81
79
4
97
80
550
3.5
49
79
4
54
79
4
61
79
4
75
81
4
88
82
4.5
104
82
5
116
81
650
4
61
81
4
73
82
4
81
83
4.5
94
83
5
102
86
5
130
84
5
155
86
750
4
79
84
4
94
88
4
105
87
4.5
122
87
5.5
126
85
5.5
159
87
5.5
189
89
850
4.5
96
86
5.5
103
84
5.5
114
85
6
133
86
6
152
87
6.5
181
88
7
204
88
950
5
114
88
5.5
128
88
6
137
87
6.5
154
87
7
174
88
7.5
208
89
8
234
89
1050
5.5
135
89
6
152
90
6
168
91
7
184
90
7.5
206
90
8
246
91
8.5
277
92
274
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Thermal Applications: Insulation
9.4.1.1 Steam and Hot Water
Steam lines and hot water pipes should be insulated to prevent heat loss from the hot fluids.
Recommended thickness for pipe insulation may be determined from the Exhibit 9.18. The energy and cost
savings will depend on the size of the pipe (diameter and length of run), the temperatures of the fluids and the
surroundings, the annual hours during which the pipes are heated, the efficiency of the heat supply, the heat
transfer coefficient, and the fraction of the year during which heat loss from the pipes does not contribute to
space heating. Exhibit 9.19 gives average cost savings from insulation of steam or hot water pipes.
Exhibit 9.19: Steam Lines and Hot Water Pipes: Costs and Benefits
Options1
Steam Lines
and Hot
Water Pipes
Installed Costs
($)2
2,087
Energy Savings
(MMBtu/yr)
984
Cost Savings
($/yr)3
3,201
Simple Payback
(yr)
0.7
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 68%.
2. One example from the IAC data base to further clarify the costs is as follows: Insulating 500 ft of
condense return pipes located throughout a plant having a 300 MMBtu/hr steam boiler resulted in
energy savings of 370 MMBtu/yr and a cost savings of $960/yr. The implementation cost was
$1,920.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
9.4.1.2 Cold Water
Lines containing chilled water should be insulated to prevent condensation and frost build-up on the
lines and to prevent heat gain. Condensation will occur whenever moist air comes into contact with a surface
that is at a temperature lower than the dewpoint of the vapor. In addition, heat gained by uninsulated chilled
water lines can adversely affect the efficiency of a cooling system.
Exhibit 9.20: Chilled Water Pipes: Costs and Benefits *
Options1
Chilled
Water Pipes
Installed Costs
($)2
970
Energy Savings
(MMBtu/yr)
56
Cost Savings
($/yr)3
850
Simple Payback
(yr)
1.1
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database in 1994. The
database does not have a separate category for Chilled Water Pipes. The implementation rate for
this measure was 52%.
2. One example from the IAC database to further clarify the costs is as follows: Insulating 250 ft of
cold pipe in a brewery resulted in energy savings of 3,500 kWh/yr and a cost savings of $234/yr.
The implementation cost was $1,200.
3. The energy cost savings are based on actual dollar savings as reported to IAC from the facility.
9.4.2 Insulation of Tanks
Tanks, similar to pipes, should be properly insulated if their purpose is to hold media at certain
temperatures, especially should that be for prolonged periods of time.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
275
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Thermal Applications: Insulation
Notes
9.4.2.1 Hot Media
Often, tanks containing hot fluids in manufacturing operations lack adequate insulation. The tanks
may be insulated with blanket type flexible insulation (1 in. thick, 1.5 Ib. density) or rigid insulation,
depending on the type of tank. The savings would increase as the boiler efficiency decreases. The savings
would also increase as the temperature in the tank increases.
Exhibit 9.21: Hot Tanks: Costs and Benefits1
Options1
Hot Tanks
Installed Costs
($)2
1,700
Energy Savings
(MMBtu/yr)
1,183
Cost Savings
($/yr)3
5,198
Simple Payback
(yr)
0.4
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 44%.
2. The cost of insulation is typically around $0.50/ft2. One example from the IAC database to further
clarify the costs is as follows: Insulating the manufacturing tanks in a food plant resulted in energy
savings of 135 MMBtu/yr. and cost savings of $470/yr. The implementation cost was $1,090. The
tanks had a top area of 50 ft2 and side areas of 175 ft2 and contained fluids at temperatures between
150°F and 230°F. The tanks were located in a room at 70°F.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
9.4.2.2 Cold Media
Uninsulated tanks containing cold fluids are occasionally found in applications, such as chilled water
tanks that are located in areas where there can be considerable heat gain through the tank surfaces. If the air
surrounding the tank is at a higher temperature than that of the tank, heat will be transferred to the contents of
the tank. By insulating these tanks, the heat transfer will be reduced and insulating these tanks can reduce the
load on the refrigeration system reduced, resulting in significant energy savings.
Exhibit 9.22: Cold Tanks: Costs and Benefits
Options1
Cold Tanks
Installed Costs
($)2
460
Energy Savings
(MMBtu/yr)
36
Cost Savings
($/yr)3
520
Simple Payback
(yr)
0.7
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database in 1994. Today
the database does not have a separate category for Cold Tanks. All values are averages based on the
database data. The implementation rate for this measure was 54%.
2. One example from the IAC database to further clarify the costs is as follows. The energy savings on
a refrigeration system having a coefficient of performance of 2 and an uninsulated chilled water tank
of 47 ft2 at a temperature of 52°F in a room at 85°F would be over 2,636 kWh/yr. if the tank were
insulated with 1 in. of fiberglass.
3. The energy cost savings are based on actual dollar savings as reported to IAC from the facility.
9.4.3 Building Insulation
Any uninsulated surface (doors, walls, roofs) is a potential heat sink in buildings. The example in
the following section can be extrapolated for basically any surface, R-values being the key in evaluation of
different insulation.
276
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Thermal Applications: Insulation
9.4.3.1 Dock Doors
Uninsulated dock doors can be a source of significant heat loss in manufacturing facilities. The
doors can often be insulated by installing styrofoam or fiberglass in the door panels. The savings depend on
the size of the doors, the efficiency of the heating system, the R-values of the insulated and uninsulated doors,
and the number of degree heating hours per year. Degree Heating Hours is a measure relating ambient
temperature to heating energy required. If the outside temperature is 1 degree below the base temperature in
the plant for 1 hour then that represents 1 degree heating hour.
Exhibit 9.23: Dock Doors: Costs and Benefits1
Options1
Dock Doors
Installed Costs
($)2
2,882
Energy Savings
(MMBtu/yr)
540
Cost Savings
($/yr)3
2,590
Simple Payback
(yr)
1.7
2.
3.
Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 52%.
One example from the IAC database to further clarify the costs is as follows: Installing insulation on
an uninsulated dock door resulted in an energy savings of 459 MMBtu/yr., a cost savings of
$2,157/yr, and an implementation cost of $3,700, giving a simple payback of 1.7 years.
The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
9.4.4 Recommended Insulation Standards
Many insulating materials are not suitable for use in direct contact with austenitic stainless steel at or
above 140°F or with aluminum. If installed wicking type insulation materials become wet, the soluble
ingredients leach out and deposit on the surface of the metal substrate. The deposited ingredients usually
consist of sodium silicate (if insulation has been inhibited) and chlorides and alkalites. The chlorides in these
deposits can cause stress corrosion cracking of austenitic stainless steel at the above mentioned temperatures
if there is not enough sodium silicate inhibitor to neutralize them. Alkaline ingredients in insulation, when
wet, can cause corrosion of unprotected aluminum substrate. Where aluminum substrate protection is
required, cost the aluminum with fibrated asphalt cutback. Excess wetting with water or especially with acid
solution can substantially reduce the service life of the inhibitor. In addition, wet insulation can corrode
unprotected carbon steel pipe and equipment, especially during storage or shutdown periods.
Inhibited insulation that is suspected of having been wet is not recommended for use on austenitic
stainless steel. Use inhibited insulation for austenitic stainless steel at or above 140 °F. If new inhibited
insulation is not available, provide field applied protection against stress corrosion cracking. Although the
coating can be applied either to the insulation or the metal, the metal is preferred.
9.4.4.1 Lowest Cost System
The lowest recommended cost system recommended is based on both installed and continuing cost,
consistent with reasonable safety and return on investment. In other words, the lowest cost thermal insulation
system is one that will remain in place for the designed life of the system and provide the desired function.
As usually is the case, the options might not be such a clear cut in real life as it seems on paper. The
interruption of the service caused by maintenance has to be accounted for as well.
9.4.4.2 Economic Factors to be Considered in Basic Insulation Selection
Different types of insulation have different applications where they are best suited for use. Four
basic types of insulation are listed here with there basic usage parameters. When considering insulation
opportunities, the Assessment Team must consider the type of insulation and the application in the
opportunity analysis.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
277
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Thermal Applications: Insulation
Notes
Glass Fiber
Glass fiber insulation has the disadvantage of moisture absorption and low resistance to abuse. The
continuing maintenance can offset any advantage of the initial cost.
Calcium Silicate
Calcium silicate and inhibited calcium silicate provide the lowest cost system in the temperature
range between 300°F and 1,200°F. They are also satisfactory down to 140 °F if polyisocyanurate foam is not
suitable.
Polvisocvanurate
Polyisocyanurate foam is preferred to both glass fiber and calcium silicate for low temperature
applications (140°F to 300°F). When compared with calcium silicate, polyisocyanurate has better moisture
resistance that is particularly important for outdoor application. Material and installation costs are
comparable with those for calcium silicate. Polyisocyanurate insulation is suitable over a temperature range
of -100°F to 300°F and, therefore, is excellent for dual temperature applications.
Mineral Wool
Mineral wool provides the lowest cost system in the temperature range of 1,200°F to 1,800°F. This
is true only if the metal surfaces to be insulated are not austenitic stainless steel and/or abuse resistance is not
a factor.
9.4.4.3 Finish Factors Influencing Insulation Selection
Where the chemical environment permits, the lowest initial cost finish for pipe is kraft aluminum
laminate. The finish is limited to dry, indoor, no abuse areas; and may discolor with age. The lowest cost
finish on a continuing basis for pipe and cylindrical sections of indoor or outdoor equipment, if chemical
resistance is not an issue, is smooth aluminum j acket fastened with stainless steel bands. Reinforced mastic
finishes should be used only over irregular shapes and where absolutely necessary. Stainless steel pipe
covering is recommended only in special situations where other finishes do not provide adequate protection.
9.4.5 Process Equipment
Insulating process equipment does not differ in principle from insulating tanks or pipes. The
purpose is to maintain certain temperature where required and minimize heat input to make up for heat
transfer loses, usually to the atmosphere. Contrary to a variety of service lines or holding tanks, where the
temperature is not important at the given location and an improper insulation only constitutes economic loss,
temperature in the process equipment is essential for the process and sometimes the insulation is a very
convenient way to ensure it.
9.4.5.1 Injection Mold Barrels
The barrels on injection molding machines are heated to a very high temperature to allow plastic to
flow into the mold. The heat loss from the barrels contributes to the air conditioning load in the plant as well
as increasing the energy required to keep the barrels hot. Rock wool blanket insulation is made specifically
for this purpose and is easily removed if maintenance on the barrels is required. This measure is not
recommended when ABS or PVC plastics are being molded because the shear forces generate so much heat
that cooling is required.
Exhibit 9.24: Insulate Equipment: Costs and Benefits
Options1
Injection
Mold
Barrels
Installed Costs
($)2
2,435
Energy Savings
(MMBtu/yr)
695
Cost Savings
($/yr)3
3,621
Simple Payback
(yr)
0.7
278
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Thermal Applications: Insulation
1. Tabulated data were taken from the Industrial Assessment Center (IAC) database. All values are
averages based on the database data. The implementation rate for this measure was 46%.
2. One example from the IAC data base to further clarify the costs is as follows: Insulating injection
mold barrels resulted in an energy savings of 375 MMBtu/yr, a cost savings of $2,589, and an
implementation cost of $2,028, giving a simple payback often months.
3. The energy cost savings are based on proposed dollar savings as reported to IAC from the center,
which are usually almost identical to actual savings reported from the facility.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 279
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Industrial Operations: Office Operations
Notes REFERENCES
1. Handisyde, C.C., and Mellmsh, D.J., Thermal Insulation of Buildings, HMSO, 1971
2. Malloy, IF., Thermal Insulation, Van Nostrand Reinhold, 1969
3. The Association of Energy Engineers, Corporate Energy Management Manual, The Fairmont
Press, 1979
4. Thumann A., and Mehta D.P., Handbook of Energy Engineering, The Fairmont Press, 1992
5. Kennedy, W. Jr., W.C. Turner, Energy Management, Prentice-Hall, Inc., Englewood Cliffs, NJ,
1984, pp. 204-221.
6. 1989 ASHRAE Handbook of Fundamentals, American Society of Heating, Refrigerating, and
Air Conditioning Engineers, Inc., Atlanta, GA, 1989.
7. Motor Master, Washington State Energy Office, Olympia, WA, 1992.
280 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Air Conditioning
CHAPTER 10. HVAC
This chapter discusses heating, ventilation, and air conditioning (HVAC) equipment. A description of each
type of equipment, its general uses, operation, and common opportunities for energy conservation are
presented
10.1 Air Conditioning
Air conditioning is the process of treating air to control its temperature, humidity, cleanliness, and
distribution to meet the requirements of the conditioned space. If the primary function of the system is to
satisfy the comfort requirements of the occupants of the conditioned space, the process is referred to as
comfort air conditioning. If the primary function is other than comfort, it is identified as industrial air
conditioning. The term ventilation is applied to processes that supply air to or remove air from a space by
natural or mechanical means. Such air may or may not be conditioned.
10.1.1 Equipment
Air conditioning systems utilize various types of equipment, arranged in a specific order, so that
space conditions can be maintained. Basic components consist of:
• A fan to move air.
• Coils to heat and/or cool the air.
• Filters to clean the air.
• Humidifiers to add moisture to the air.
• Controls to maintain space conditions automatically.
• A distribution system to channel the air to desired locations, including dampers to control the
volume of air circulated, as shown in Exhibit 10.1.
Within each basic component there are different types and styles, each with their own operating
characteristics and efficiency, method and materials of construction, and cost, all of which greatly affect the
initial design and resulting operating economics of the system. While this manual is directed principally to
conservation with existing installations, ideally energy conservation should start during the initial design and
equipment selection stages of the system.
10.1.1.1 Fans
The centrifugal fan with a backward-curved impeller is the predominant fan used in "built-up" type
air conditioning units, while the forward-curved impeller centrifugal fan is used in "package" type air
handling units.
10.1.1.2 Coils
Coils are used in air conditioning systems either to heat or cool the air. The typical coil consists of
various rows deep of finned tubing. The number of fins per inch varies from 3 to 14. The greater the number
of fins per inch and row's depth that a coil contains, the greater its heat transfer rate will be. An increase in
heat transfer surface results in an increase in heat transfer efficiency and also in increased airflow resistance
that will, in turn, require increased fan horsepower.
Heating coils will use either steam or hot water as a heating medium. The primary purpose of the
coil depends upon its location in the air handling system. A preheater is the name given to a coil located in
the makeup outdoor air duct. The preheater's purpose is to raise the temperature of makeup air to above
freezing. The heating coil doing the final heating of the air before it enters the conditioned space is referred
to as a reheater. Its purpose is to maintain satisfactory space temperature by adding heat to the supply air
when it is required.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 281
Notes
-------
HVAC: Air Conditioning
Notes
Exhibit 10.1: Air Conditioning Equipment
C»mscsr r-n*«ic«
**?"»* HlB i #» \
'
Cooling coils similar to that of the heating coils described above except that the coils cool the air
instead of heating. The cooling medium used is chilled-water, brine, or refrigerant in a direct expansion-type
coil. Direct expansion-type coils are used on small systems when a chilled water system is not economical.
Chilled water is used on all other systems when the air temperature required is above 50°F. When the air
temperature required is less than 50°F, a brine solution is used as the cooling medium because of its exposure
to subfreezing temperatures in the refrigeration machine.
10.1.1.3 Air Washers
A spray-type air washer consists of a chamber or casing containing a spray nozzle system, a tank for
collecting the spray water as it falls, and an eliminator section at the discharge end for removal of entrained
drops of water from the air. An air washer can be used either to humidify or dehumidify the treated air
depending upon the temperature of the spray water. Air washers will also clean the air to a small extent. Air
washer efficiency increases as the volume of spray water circulated increases. When spray water is used for
humidification purposes, it is recirculated with only sufficient makeup to satisfy evaporation losses. When
spray water is used for cooling, it is a mixture of recirculated water and chilled water. The amount of chilled
water is controlled to provide desired results.
The use of air washers in the comfort air conditioning field has been gradually replaced by the use of
cooling coils. Some industrial air conditioning systems, particularly in the textile industry, still use air
washers.
10.1.1.4 Air Cleaners
Air cleaners (filters) are used to reduce the dirt content of the air supplied to the conditioned space
and to keep equipment clean. The type of air cleaning equipment required depends upon the requirements of
the conditioned space, the amount of dirt to be removed from the air stream, and the size of the dirt particles
to be removed. The smaller the particles size to be removed, the harder and more expensive the air cleaning
procedure.
282
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Air Conditioning
Three operating characteristics distinguish the various types of air cleaners: efficiency, airflow
resistance, and life or dust-holding capacity. Efficiency measures the ability of the air cleaner to remove
particulate matter from an air stream. The interpolation of air cleaner ratings for efficiency and holding
capacity is complicated by the fact that there are three types of tests, along with certain variations, employed
for testing filters. The operating conditions that exist are so varied that there is no individual test that will
adequately describe all filters. Air cleaners used in the comfort air conditioning field fall into three broad
categories: fibrous media, renewable media, and electronic. Various combinations of these types can be used.
Air cleaners for industrial applications fall into five basic types: gravity and momentum collectors, centrifugal
collectors, fabric collectors, electrostatic precipitators, and wet collectors.
The installation cost and the operating cost of an air cleaning system vary over a wide range.
Therefore, an economical installation is one in which the air cleaning unit(s) provides only the degree of
cleaning required to satisfy the actual space requirements and not those of an arbitrarily excessively clean
environment.
The pressure drop to which the air cleaning devices subject the air system varies from a low of 0.1
inch of water gauge (inches W.G.) to 10.0 inches W.G. in industrial air conditioning systems. In comfort air
conditioning, generally, the higher the air cleaner efficiency, the higher its pressure drop will be. Air
conditioning systems must compensate for the pressure drop through an increase in fan horsepower.
10.1.1.5 Humidifiers
Humidifiers are devices that add moisture to the air stream, thereby raising the relative humidity of
the conditioned space. In most comfort air conditioning systems and in many industrial air conditioning
systems, humidifying devices are commonly sparging steam or atomizing water directly into the air stream.
Since the advent of energy conservation, the standards for comfort air conditioning systems have
been reviewed and revised. One of the revisions eliminated the control of humidity as a comfort air
conditioning system standard, since controlling humidity requires additional energy consumption year-round.
In industrial air conditioning systems that employ humidity control, it is recommended that this need be
reviewed and be reduced to the lowest degree the process will permit.
10.1.1.6 Controls
Controls for an air conditioning system contain various control loops, which automatically control
selected functions of the air conditioning system operation. The control system can be very simple or very
complex depending upon the size and complexity of the air conditioning system, the extent of operation, and
the degree of sophistication desired.
Control systems can control temperatures, humidity, duct pressure, airflow, sound alarms, and
provide data to remote locations. These systems are operated either pneumatically or electronically, or a
combination of both can be used. For the most economical operation of the air conditioning system, controls
must be maintained. Their calibrations should be routinely checked along with the proper operation of valves
and dampers.
10.1.1.7 Distribution System
The distribution system is a network of ducts which transports the air between the conditioning
equipment and the conditioned space(s). The system consists of outlet and inlet terminals (diffusers,
registers, grilles) for distribution of air within the conditioned space, and dampers (automatic and manual) for
control of air volume. The design of the distribution system greatly affects the amount of pressure drop
(resistance) it adds to the total system. Low-pressure (low-velocity) systems are designed with duct velocities
of 1,300 fpm or less for comfort air conditioning systems and up to 2,000 fpm for industrial air conditioning
systems. High-pressure (high-velocity) systems employ duct velocities from 2,500 fpm on small systems
(1,000 to 3,000 cfm) up to 6,000 fpm on large systems (40,000 to 60,000 cfm). Higher duct velocities result
in higher duct system resistance (pressure drop resulting in increased fan horsepower).
10.1.2 Psychrometry
Psychrometry deals with the determination of the thermodynamic properties of moist air and the
utilization of these properties in the analysis of conditions and processes involving moist air. Air
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 283
Notes
-------
HVAC: Air Conditioning
JT , conditioning deals with changing the properties of air to provide desired results in the conditioned space. The
psychrometric chart, a graphical representation of the thermodynamic properties of moist air, is an invaluable
aid in illustrating and solving air conditioning problems.
Since the properties of moist air are affected by barometric pressure, corrections must be made when
equipment installation is done at other than sea level (29.92 inches Hg). Psychrometric charts are available
for elevations at sea level, 2,500 feet, 5,000 feet, 7,500 feet, and 10,000 feet. Also, charts are available for
different temperature ranges. The properties of moist air shown on a psychrometric chart are dry bulb (DB)
temperature, wet bulb (WB) temperature, dew point temperature (DP), relative humidity (RH) in percent,
specific humidity (W) in grains per pound, specific enthalpy (h) in Btu per pound, and specific volume (V) in
cubic feet per pound. A description of these terms is listed in Appendix D. These properties can be found by
using a typical psychrometric chart.
10.1.3 Computation
The following formulae and factors are used in the air conditioning field:
Btu = (Ibs) (sp. heat) (At)
Btu/hr = (Ibs/hr) (sp. heat) (At)
Btu/hr = (Ibs/hr) (hg - hf)*
Lbs/hr std. air = (cfm) (Ibs/cf) (60 min/hr)
= (cfm) (0.075) (60)
= (cfm) (4.5)
SH, Btu/hr std. air = (Ibs/hr) (sp. heat) (At)
= (cfm) (4.5) (0.24) (At)
= (cfm) (1.08) (At)
cfm = SH / [(1.08)(room temperature - supplied air temperature)]
LH, Btu/hr std. air = (Ibs/hr) (hg -hf) (grains of moisture diff 77,000 grains/lb)
= (cfm) (4.5) (1,054) (grains diff/7,000)
= (cfm) (0.68) (grains diff.)
Lbs/hr water = (gpm) (Ibs/gal) (min/hr)
= (gpm) (10.33) (60)
= (gpm) (500)
hpair = [(cfm)( AP)] / [(6,350)(fan efficiency)]
hpwater = [(gpm)( AP)] / [(3,960)(pump efficiency)]
where
At = temperature difference
AP = pressure difference
*(hg -hf) = 1,054 Btu/lb represents the heat of vaporization at 70°F. Variation in value for different
conditions will be small.
10.1.4 Energy Conservation
The potential for energy conservation in the air conditioning field can vary greatly depending upon
the following:
2§4 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Air Conditioning
1. Design of systems 4. Maintenance of control systems
2. Method of operation 5. Monitoring of system
3. Operating standards 6. Competence of operators
Examples of various energy-saving methods used in the following sections are based on a facility
having the following characteristics:
1. Supply fan capacity: 10,000 cfm @ 3,0 in S.P., 6.8 bhp
2. Outdoor air: 30% = 3,000 cfm
3. Return air: 70% = 7,000 cfm
4. Room temperature: 75°F DB, 62.5°F WB, 55.0°F DP, 50% RH
5. Room loads: summer = 108,000 Btu/hr/(sensible heat)
winter = 216,000 Btu/hr/(sensible heat)
6. Space, volume: 55,000 cu. ft.
7. Space, area: 5,500 sq. ft.
8. Space, cfm/sq.ft.: 1.8
9. Space, supply air temp.: summer design = 65°F,
winter design = 95°F
10. Design preheater load : 162,000 Btu/hr= 169 Ibs/hr (based on 50°F disc, temp.)
11. Design on cooling coil load: 364,500 Btu/hr = 30 tons
12. Design outdoor temp.: summer = 95°F DB, 78°F WB; winter 0°F
13. Design outdoor degree days : 5,220 (65°F), 3,100 (55°F), 2,100 (SOT)
14. Design outdoor avg. winter temp.: 41.4°F(Oct. to Apr. inclusive)
< 67.0°F, 3,052 hrs/yr
38.0°F = Avg. < 50°F, 3,543 hrs/yr
33.0°F = Avg. < 40°F, 2,162 hrs/yr
15. Equiv. hrs/season refrig. at full load: 750 hrs
10.1.4.1 Operate Systems Only When Needed
Air conditioning systems, including refrigeration machines, pumps, and cooling tower systems,
should be operated only when areas are occupied (for comfort air conditioning systems) and when processes
are operating (for non-comfort air conditioning system). It is not uncommon for systems to operate
continuously. Reducing operating hours will reduce electrical, cooling, and heating requirements.
Continuous operation during normal working hours of 8 a.m. to 5 p.m., five days per week, such as that for an
office building is a good example of excessive operation of equipment.
The savings resulting from reducing operating hours from 168 hours per week to 50 hours per week
is calculated as follows.
Savings from Reduced Fan Operation
= (Supply fan bhp) (Cost, $/hp-yr) [(hrs/wk shut off) / (hrs/wk current operation)]
= (6.8) ($360) [(168 - 50) / (168)] = $l,720/yr
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 285
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HVAC: Air Conditioning
JT , Savings from Reduced Space Heating Operating
= {[(24)(deg day)(design htg. load, Btu/hr)] / [room T - outside T]}(stm. cost, $/MM-Btu) x
{(hrs/week off) / (hrs/week current on)}(allowance for heat up)
= {[(24)(5,220)(216,000)] / [(75 - 0)]}{$4.24 / 10 6 }{(168 - 50) / 168}(0.5) = $537/yr
Savings from Reduced Preheater Operation of Outdoor Air
= (cfrn) (1.08)* (design disc. temp. - avg. temp. < disc. temp.)x (hrs/yr temp. < disc, temp.) x (stm.
cost, $/MM-Btu) x {(hrs/week off) / (hrs/week current operation)}
= (3,000) (1.08) (50 - 38) (3,543) {$4.24/ 106}{(168 - 50) / 168} = $410/yr
* Factor of 1.08 = 0.075 Ibs/cu. ft. xO.24 sp. heat x 60 min/hr
Savings from Reduced Cooling Operation
= (design cooling oil load, tons) (equiv. hrs/season @ full load) x (refrig. sys. load, hp/ton)
{(hrs/week off) / (hrs/week current operation)} x (cost, $/hp-hr) (allowance for cool down)
= (30) (750) (1.25){(168 - 50) / 168}($0.041) (0.75) = $607/yr
Summary of Total Annual Savings
Fans = $1,720
Space Heating = 537
Preheater = 410
Space Cooling = 607
Total = $3,274
10.1.4.2 Eliminate Overcooling and Overheating
Eliminating overcooling and overheating normally requires revising operating standards and
modifying air conditioning system controls. Instead of maintaining a constant temperature, the more energy
efficient standard allows the temperature to fluctuate within a dead-band range. Heating should be used only
to keep the temperature of the conditioned space from going typically below 68°F to 70°F and cooling should
be used only to keep the temperature from exceeding 78°F to 80°F. These conditions apply only during
normal hours of occupancy. During unoccupied periods, the standard should specify minimum conditions
necessary to protect the building's contents. Process requirements may, of course, dictate maintaining special
conditions. Exhibit 10.1 illustrates a single zone system with a simple control system that results in
overcooling and overheating. Exhibit 10.2 shows this system with a modified control system that would
eliminate simultaneous cooling and heating.
Cooling Example
The cooling coil and reheat coil are controlled as shown in Exhibit 10.1. The savings resulting
during the heating season if the coils were controlled in sequence as shown in Exhibit 10.2 is calculated
below. Assume that the mixed air temperature entering the cooling coil is 68°F, and the heating season is
seven months long.
Savings from Eliminating Excessive Cooling
= {[(cfm)(1.08)(temp. diff)] / [Btu/ton]} (hp/ton) ($/hp-yr) (htg. season, mos./12)
= {[(10,000)(1.08)(68 - 50)] / [12,000]}(1.25) ($360)(7/12) = $3,040/yr
2§6 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Air Conditioning
Total Annual Savings
Cooling
Reheating
Total
Heating Example
$3,070 (from previous example)
3,040
5,110
The savings resulting from changing the room thermostat setting from 75°F to 68°F during the
heating season is calculated as follows.
Given:
1. Room heating load at 75°F = 216,000 Btu/hr
2. Room heating load at 68°F = (216,000)(68/75) = 195,800 Btu/hr
Annual Costvs-p
= {[(24)(deg day)(design htg. load, Btu/hr)] / [room T - outside T]}(stm. cost, $/MM-Btu)
= {[(24)(5,220)(216,000)] / [(75 - 0)]}{$4.24/ 106} = $1,530
Annual Costg8°F
= (Annual cost at 75°F) [(68°F - winter average temp.) / (75°F - winter average temp.)]
= ($1,530)[(68 - 41.4)7(75 - 41.4)] = $1,211
Annual Savings = $1,530 - $1,211 = $319
Note: Difference in cost is proportional to temperature difference maintained with ambient temperature
Exhibit 10.2: Modified Air Conditioning System Controls
Notes
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HVAC: Air Conditioning
Notes 10.1.4.3 Eliminate Reheat
When humidity control is required, the conventional method is to cool the air to the required dew
point temperature to remove the excess moisture and then reheat the air to deliver it at the desired humidity
and temperature as illustrated in Exhibit 10.2. The cost of reheating for humidity control is not considered
justified in today's energy situation for comfort air conditioning systems.
The inclusion of a humidity standard is not recommended for normal air conditioning comfort
standards and should be discontinued. Likewise, no system should operate in a manner that requires it to heat
and cool at the same time. At any given instant the system should be either heating or cooling—never both.
The process of cooling and then reheating is inefficient, whether for humidity control or because of system
design.
10.1.4.4 Economizer Cycle
Many air conditioning systems operate with a fixed minimum amount of outdoor air. The
mechanical refrigeration load on these systems can be reduced by modifying the system to utilize outdoor air
at up to 100 percent of its supply airflow when outdoor air is cooler than return air. This is referred to as an
economizer cycle. Many systems do not have an economizer cycle and fail to take advantage of its potential
savings.
An economizer cycle will eliminate or reduce mechanical cooling when the outdoor air is cooler
than return air. When outdoor air is warmer than return air, only the minimum amount of outdoor air required
for fresh air supply is used.
The switchover point of an economizer cycle is usually done by one of two methods: sensing
outdoor dry bulb (DB) temperature or sensing outdoor and return air enthalpy (heat content). Exhibit 10.3,
Exhibit 10.4 (dry bulb method), and Exhibit 10.5 illustrate the two methods of economizer control.
In the outdoor DB temperature switchover method, when the outdoor DB temperature is above the
set point temperature, the dampers are in their normal position-outdoor damper closed to minimum air inlet
flow position and return air damper fully open. When the outdoor DB temperature is less than set point
temperature, the dampers are modulated by the temperature controller.
In the enthalpy switchover method, the enthalpy control senses DB temperature and relative
humidity in both the outdoor air and return air streams and feeds these values into an enthalpy logic center.
The logic center compares the enthalpy (heat content) of each air stream and allows outdoor air to be used
whenever its enthalpy is less than that of the return air.
When the outdoor enthalpy is greater than the enthalpy of the return air, the dampers are maintained
in their normal position—outdoor damper closed to minimum air inlet flow position and return air damper
fully open in the same manner as the outdoor temperature switchover method. When the outdoor enthalpy is
less than the enthalpy of the return air, the dampers are modulated by the temperature controller.
The energy switchover method is more efficient because it is based on the true heat content of the
air. The enthalpy of air is a function of both the DB temperature and its relative humidity (or wet bulb
temperature). Therefore, DB temperature alone is not a true measure of the air's heat content. Under certain
conditions, air with a higher DB temperature can have a lower enthalpy than air with a lower DB temperature
because of differences in humidity. The outdoor DB temperature switchover method utilizes a single
conservative DB temperature between 55°F to 60°F, which ensures the enthalpy of the outdoor air is always
less than the enthalpy of the return air. On the other hand, since the enthalpy switchover method determines
the use of outdoor air on its enthalpy, the switchover point will vary and normally occur at a higher outdoor
DB temperature than the DB temperature typically selected for the outdoor DB switchover method.
Consequently, less mechanical cooling is required than with the outdoor DB temperature switchover method.
In the method shown in Exhibit 10.3, which is found in many installations, the makeup air and return
air dampers are controlled to maintain a fixed mixed air temperature. In Exhibit 10.4 the control system that
operates the chilled-water valve also operates the makeup air and return air dampers in sequence with the
chilled-water valve. The method illustrated in Exhibit 10.4 is better because it results in a lower load on the
cooling coil. The preferred method, however, is shown in Exhibit 10.5, which utilizes enthalpy control for
switchover.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Air Conditioning
Exhibit 10.3: Economizer Cycle (Outdoor Temp. Switchover, Mixing Temp. Control)
Minimum
A*
\
"/
Coesng Coil
i
4.
-^o—*-
ftelum
Air
From
Exhibit 10.4: Economizer Cycle (Outdoor Temp. Switchover, Chilled H 2 O Control)
Minimum
M* Ai<
r Air
/
|
A
fiatum
Air
I T, i^'-'tspsig
! i
Exhibit 10.5: Economizer Cycle (Enthalpy Switchover, Chilled H 2 O Control)
pg Cos!
i Minimum
OuHcic." An
'1
A
atyr
Air
Contrdi-ei
The savings resulting from an economizer cycle vary with the type of economizer cycle control and
the type of air conditioning system control. Savings for different conditions are given in the examples shown
below.
Notes
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HVAC: Air Conditioning
*T . Outdoor Temperature Method
The saving resulting from an economizer cycle with outdoor temperature switchover at 56.5°F on a
year-round air conditioning system (continuously operating) is calculated as follows. The preheater discharge
temperature is controlled at 40°F. Savings are determined in two steps.
1. Economizer savings when the outdoor temperature is < 40°F. The temperature of the air entering the
cooling coil when the outdoor air is less than 40°F is 64.5°F.*
= {[(cfm)(1.08)(temp. diff.)] / [Btu/ton]}(hp/ton)(refrig., hp/ton)(cost, $/hp-yr) x {(hrs temp < 40°F)
/ (8,760)}
= {[(10,000)(1.08)(64.5 - 56.5)] / [ 12,000]}(1.25) ($360)(2,162/8,760) = $800/yr
2. Economizer savings when the outdoor temperature is between 40°F and 56.5°F. (Above 56.5°F only
minimum 30% outdoor air is used.) The average temperature of air entering the cooling coil is
approximately 67°F*, which represents the midpoint between the maximum and the minimum
temperature that would occur.
= {[(10,000)(1.08)(67* - 56.5)] / [12,000]}{(1.25) ($360)[(3,052) / (8,760)] = $l,481/yr
Max Min
Outdoor temp. = 56.5°F 40.0°F
30% outdoor air = 17.0 12.0
70% return air @ 75T = 52.5 52.5
Avg. temp. = 69.5 64.5
Average = (69.5°F + 64.5°F) / 2 = 67°F
Annual Savings for Condition A
Outdoor temp. < 40°F = $ 800
Outdoor temp, between 40°F and 56.6°F = 1,400
Total $2,280
*Temperature of air entering coil.
Enthalpy Switchover Method
Given the same conditions as the previous example, the savings from an economizer cycle using the
enthalpy method. To determine either enthalpy, the wet bulb (WB) temperature or dry bulb temperature (DB)
and relative humidity are needed. The enthalpy value for the particular condition can be read from a
psychrometric chart.
For this example, an average outdoor air relative humidity of 50 percent at 56.5°F is assumed, which
corresponds to 47.5°F WB temperature. The actual additional reduction in cooling load over the outdoor
temperature method will depend on the outdoor air conditions at the time. The reduction can vary over the
range from no reduction when conditions approach 62.5°F WB to a maximum reduction when approaching
47.5°F WB. For practical purposes it can assumed an average reduction of approximately one half of the
maximum.
The cooling load when all return air is used is:
Btu/hr = (ret. air cfm) (4.5) (h ret. air - h cooling air disc.)
= (7,000) (4.5) (28.2-19.0)
= 289,000 or 24.15 tons
The cooling load when all outdoor air is used is zero.
290 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Air Conditioning
Therefore, the average reduction in cooling load using outdoor air with the enthalpy switchover
method is:
Reduction cooling load = 289,800 / 2 = 144,900 Btu/hr
Enthalpy remains constant for any given WB temperature irrespective of DB temperatures.
Accordingly, the number of hours for which a given enthalpy existed can be obtained from local weather
records of WB temperatures. For this example, the outdoor WB temperature was between 47.5°F WB and
62.5°F WB for approximately 2,000 hours per year.
Additional annual savings using enthalpy control:
= [(Btu/hr saved) / (Btu/ton)](refrig., hp/ton)(cost, $/hp-yr)[(hrs. applicable) / (8,760)
= [(144,900) / (12,000)](1.25)($360)[(2,000) / (8,760)] = $l,240/yr
Total annual savings for the enthalpy switchover method over no economizer cycle include the
above savings plus the savings for the DB switchover outdoor temperature method in the previous example.
Outdoor temperature method = $2,280
Additional savings with enthalpy method = $1.240
Total $3,520
10.1.4.5 Minimize Amounts of Makeup and Exhaust Air
The amount of makeup air a system must have depends upon the largest demand caused by the
following:
1. Ventilation for personnel
2. Exhausting of air from work areas
3. Overcoming of infiltration
In many systems, the sum of items No. 2 and 3 dictates the amount of makeup air required. When
this is the case, the amount of air being exhausted should be reviewed to determine if it is excessive.
Minimizing infiltration requires that all openings between conditioned and non-conditioned spaces be closed
and that doors and windows fit tightly. The ventilation rate for people can vary between 5 to 20 cfm and
sometimes higher depending on the use of the room. Also, excessive damper leakage can result in an
excessive amount of makeup air.
Excess makeup air in the winter will result in additional heating load. The cost to preheat 1,000 cfm
of outdoor air to 50°F is calculated as follows.
Cost = (cfm) (1.08) (SOT - avg. temp. < 50) (hrs./yr. temp < 50°F)x (stm. cost, $/MM-Btu)
= (1, 000) (1.08) (50 - 38) (3,543) ($4.26 / 106) = $196/yr.
Excess make-up air in the summer will result in additional cooling load. The cost of cooling is
estimated to be $410/yr. Total annual savings = $196 + $410 = $606
10.1.4.6 Minimize the Amount of Air Delivered to a Conditioned Space
The amount of air delivered to a conditioned space is governed by one or more of the following:
1. Heating and/or cooling load
2. Delivery temperature
3. Ventilation requirements (exhaust, people, infiltration)
4. Air circulation (air changes)
The design of both comfort and many industrial air condition systems requires that, for good air
circulation, the amount of supply air should provide an air change every 5 to 10 minutes. The design of many
systems will be for a 6- to 7-minute change. Reducing airflow will reduce fan horsepower. The model that
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 291
Notes
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Notes
HVAC: Air Conditioning
has been used is such a system; it requires heat, and the air change is 5.6 minutes (1.8 cfm per square foot, 10-
foot ceiling height).
The method used in reducing the system's airflow has a great influence on the amount of horsepower
saved. Three methods normally used are:
1. Fan discharge damper
2. Fan vortex damper (fan inlet)
3. Fan speed change
The savings resulting from reduced reheat and fan horsepower on a year-round air conditioning
system when the airflow is reduced from 1.8 cfm per square foot (5.6 minute air change) to 1.1 cfm per
square foot (9.1 minute air change) can be calculated as follows.
1. Find the new airflow
cfm 2 = (cfm)[(air change 2) / (air change 1)] = 10,000 (1.1/1.8) = 6,110
2. Find the new supply temperature:
Supplied air inlet temp. = room temp. - [(given room sensible load, Btu/hr]) / [(1.08)(cfm)]
= 75 - [(108,000) / (1.08 x 6,110)] = 58.6°F
3. Find the savings from reheat reduction:
Costi.g = (cfm) (1.08) (T2 - TI) (cost, $/MM-Btu/hr-yr)
= (10,000) (1.08) (65 - 56.5) [($37,100) / 106] = $3,406/yr
Costi.i =(6,110) (1.08) (58.6-56.5) [($37,100)7 10°] = $514/yr
Annual Savings (Reheat Reduction) = $3,406 - $514 = $2,892
4. Find the cfm reduction (in percent):
cfm reduction = [(cfm2)/(cfm1](100)=[(6,l 10)/(10,000)](100)=61%
5. Find the total savings:
Exhibit 10.6: Total Savings
Method of
Reduction
Outlet
Damper
Inlet Vane
Damper
Fan Speed
Hp Red*
%
14.2
45.0
63.8
Initial hp
6.8
6.8
6.8
Saved hp
0.97
3.06
4.34
Cost
$/hp-yr
360
360
360
Savings**
$/yr
349
1,100
1,560
*Based on continuous operation
**From Exhibit 10.7
6. Find the total savings:
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HVAC: Air Conditioning
Exhibit 10.7: Effect of Volume Control on Fan Horsepower
$ Savings
Method
Outlet Damper
Inlet Vane
Damper
Fan Speed
Fanhp
349/yr
1,100/yr
1,560/yr
Reheat
2,900/yr
2,900/yr
2,900/yr
Total
3,249/yr
4,000/yr
4,460/yr
10.1.4.7 Recover Energy
The use of air-to-air heat exchangers permits the exchange of energy between an exhaust air
stream(s) and a makeup air stream(s). Many of the exchangers will permit the exchange of only sensible heat
while a few will permit the exchange of enthalpy (total heat). The transfer recovery efficiency of air-to-air
heat exchangers varies from 55 percent to 90 percent, depending upon the type of heat exchanger and the face
velocity.
10.1.4.8 Maintain Equipment
The physical condition of the air handling unit is important to its efficient operation. Filters should
be cleaned or replaced as soon as the maximum allowable pressure drop across the filter is attained. If dirt
builds up to a point where the pressure drop exceeds the maximum allowable, the resulting system pressure
increase will reduce the fan's pressure and subsequently reduce the air handler's efficiency.
As mentioned in an earlier section, dampers should seal tightly. Air leakage due to poor damper
operation or condition will result in added loading of the air handling unit. The fans should be checked for
lint, dirt, or other causes for reduced flow.
10.2 HVAC Systems
In this section the HVAC will be treated like a system of different functions put together; in other
words the transparency of individual components might not be very transparent. However, in some cases it is
important to treat the whole operation in such a way. Exhibit 10.8 summarizes energy usage in buildings
much of that can be contributed to HVAC, i.e., conditioning of buildings for personnel comfort. The
remainder of this chapter will discuss some of the design factors in HVAC and energy conservation methods
for HVAC systems.
Exhibit 10.8: Energy Use in Buildings
Other
10%
Fans & Pumps
30%
Lighting
30%
Boilers &
Chillers
30%
Notes
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Notes
HVAC: HVAC Systems
10.2.1 Equipment Sizing Practices
Usually all existing energy consuming systems are oversized. The reasons for oversizing of HVAC
equipment include:
1.
2
3.
All HVAC design procedures are conservative.
A "Safety Factor" is then applied.
Design is for a near-extreme weather condition that is very seldom obtained (2-3% of annual hours).
4. Standard equipment size increments usually result in further oversizing.
Any attempt to conserve energy amplifies the effect of statements above. Operating efficiencies of equipment
decrease with decreasing load - usually exponentially.
10.2.1.1 Reducing Capacity by Fan/Pump Slowdown
The capacity of HVAC systems can be reduced by using a slowdown technique to reduce the hp
output. It should be noted that reducing the hp output of fan and pump motors will also reduce their
efficiency. Exhibits 10.9 and 10.10 illustrate the affects of this technique.
CFM,
HP,
HP,
CFM2
OR
(GPM,
(GPM,
Thus: If CFM/GPM is reduced by 10%, the new hp will be 73% of original and for CFM/GPM
reduction of 40%, new hp will be 22% of original.
Exhibit 10.9: Load vs. Efficiency
1100%
100%
Exhibit 10.10: Control Valve Characteristics
294
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HVAC: HVAC Systems
100?
fufii Down
(msn. Flow}
100%
Common
Operating
Range
10.2.1.2 Maximize HVAC Savings
Energy conservation in HVAC systems can be maximized by using these techniques:
1. Reduce fan & pump horsepower - replace motors if necessary.
2. Reduce operating time - turn it off when not needed.
3. Retrofit existing HVAC systems to some form of VAV (Variable Air Volume) systems.
5. Eliminate or minimize reheat.
6. Maintain, calibrate & upgrade control systems.
These techniques were discussed in detail earlier in the chapter for independent systems but can be applied to
HVAC system components. When evaluating HVAC requirements and energy conservation measures,
facilities should take into consideration all heating and cooling loads as illustrated in Exhibit 10.11. This will
provide the correct criteria for evaluations and cost savings estimates.
10.2.2 Design for Human Comfort
Providing comfortable conditions for people engaged in the working process is not a superfluous
luxury, as might be viewed by some. Good working conditions definitely increase productivity, besides the
indirect benefit of employees' satisfaction in their workplace. However, all the comfort should be provided at
the minimum expense, whether it a company or a private residence.
Determination of the correct HVAC needs for a facility involves many steps, including:
• Determination of indoor conditions and how they affect energy use,
• Impact upon equipment selection, ducting, and register design,
• How to determine if certain conditions will meet acceptable comfort criteria.
Notes
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HVAC: HVAC Systems
Notes
The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) publish
standards for many aspects of HVAC design. One example is ASHRAE Standard 62-1989, "Ventilation for
Acceptable Indoor Air Quality."
Exhibit 10.11: Heating and Cooling Loads
OUTSIDE AIR
TRANSMSSON
h€AT GAN
I
0°F
§
i
l§
80 LA R HE AT GAIN
(VARES)
LIGHTING HE AT GAIN
70 °R
I€ATLCBS
4«1
OUTSDEAIR
HE A TINS
100%
ASHRAE Standard 90-1980 "Energy Conservation in New Building Design" gives the following
guidelines for energy conservation regarding HVAC systems.
1. Summer
• Troom>78°F
• (fe-oom: Min HVAC energy use
• >0.3 ACH (residential)
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HVAC: HVAC Systems
2. Winter
• Troom>72°F
• > 0.3 ACH (residential)
Exhibit 10.12 defines the comfort zone for personnel using criteria such as temperature and vapor pressure.
From this chart the comfort zone for consideration in the HVAC design is:
1. Summer
• 73°F<60%
2. Winter
• 68°F < Tdb < 75°F
• 30%<70%
Most of the work on comfort since about 1970 has been to redefine the x-axis on the comfort chart to
be more general (i.e., include effects of heat radiation, clothing, metabolism, air motion, etc.). There are
different approached to quantifying comfort. To minutely quantify comfort is the EUROPEAN approach
(reason: they don't heat their buildings as much). The UNITED STATES approach is to adjust the thermostat
(becoming less acceptable to do so).
Exhibit 10.12: Comfort Zone Detail
w
01
s.
2
§
1,7
•^
Clo at PPD»<>%
.50
10.2.2.1 Factors Affecting Comfort
There are three major factors affecting personnel comfort. These are biological, dothing, and
environmental indices.
Biological factors that affect personnel comfort include respiration, metabolism, and the types of
activities personnel are performing. Exhibit 10.13 illustrates the biological factors that affect a persons
comfort. For example, a persons average core temperature is:
TCORE=37°C + 1°C (98.6°F)
but their actual skin temperature may be:
TSKiN=92.7°F (buffer, adjusts to ambient)
Notes
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HVAC: HVAC Systems
Notes
Exhibit 10.13: Biological Factors Affecting Comfort
Respiration
Radiation
Convection
Evaporation
A person's activity has a great affect on their metabolic heat generation. For example an adult
male's heat generation rate during three different activities would be:
• 100 W; seated at rest
• 850 W; heavy exercise
• 1,500 W; Olympic Athlete
Exhibit 10.14 lists the heat flux generated for various activities further illustrating how much activity affects
comfort.
Exhibit 10.14: Heat Flux Generated by Various Activities
Various Activites3
Resting
Sleeping
Reclining
Seated, quiet
Standing, relaxed
Walking (on the level)
0.89 m/s
1.34m/s
1.79 m/s
Office Activities
Reading, seated
Writing
Typing
Filing, seated
Filing, standing
Walking about
Lifting/packing
Driving/Flying
Car
Aircraft, routine
Btu/h-ft2
13
15
18
22
37
48
70
18
18
20
22
26
31
39
18-37
22
metb
0.7
0.8
1.0
1.2
2.0
2.6
3.8
1.0
1.0
1.1
1.2
1.4
1.7
2.1
1.0-2.0
1.2
Exhibit 10.15: Heat Flux Generated by Various Activities (cont.)
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HVAC: HVAC Systems
Various Activites3
Aircraft, instrument landing
Aircraft, combat
Heavy vehicle
Miscellaneous Occupational Activities
Cooking
House cleaning
Seated, heavy limb movement
Machine work
Sawing (table saw)
Light (electrical industry)
Heavy
Handling 50-kg bags
Pick and shovel work
Miscellaneous Leisure Activities
Dancing, social
Tennis, singles
Basketball
Wrestling, competitive
Btu/h-ft2
33
44
59
29-37
37-63
41
33
37-44
74
74
74-88
44-81
66-74
90-140
130-160
met*5
1.8
2.4
3.2
1.6-2.0
2.0-3.4
2.2
1.8
2.0-2.4
4.0
4.0
4.0-4.8
2.4-4.4
3.6-4.0
5.0-7.6
7.0-8.7
3 Complied from various Sources. For additional information see Buskirk (1960), Passmore and
Dumm (1967), and Webb (1964)
b lmet= 18.43 Btu/h-ft2
Clothing is the second major factor affecting comfort. Clothing acts as insulation for the skin. As
illustrated in Exhibit 10.15 and Exhibit 10.16, the insulation value of clothing can vary widely.
• Clothing resistance (clo); 1 do = 0.155 m 2 •
• I clo*R-l
°C/W = 0.88h-ft2-°F/Btu
Exhibit 10.16: Clothing Resistance
clo
'/2
1
4
Attire
Slacks, short sleeve shirt
Three-piece suit
Fur coat
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
299
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HVAC: HVAC Systems
Notes
Exhibit 10.17: Garment Insulation Values
Garment3 Description
Underwear
Man's briefs
Panties
Bra
T-shirt
Full slip
Half slip
Long underwear top
Long underwear bottom
Footwear
Ankle -length athletic socks
Calf-length socks
Knee socks (thick)
Panty hose stockings
Sandals/thongs
Slippers (quilted, pile -lined)
Boots
Shirts and Blouses
Sleeveless, scoop-neck blouse
Short -sleeve, dress shirt
Long-sleeve, dress shirt
Long-sleeve, flannel shirt
Short -sleeve, knit sport shirt
Long-sleeve, sweat shirt
Trousers and Coveralls
Short shorts
Walking shorts
Straight trousers (thin)
Straight trousers (thick)
Sweat pants
Overalls
Coveralls
I/clo
0.04
0.03
0.01
0.08
0.16
0.14
0.20
0.15
0.02
0.03
0.06
0.02
0.02
0.03
0.10
0.12
0.19
0.25
0.34
0.17
0.34
0.06
0.08
0.15
0.24
0.28
0.30
0.49
Garment3 Description
Dresses and Skirts
Skirt (thin)
Skirt (thick)
Long-sleeve shirt dress (thin)
Long-sleeve shirt dress (thick)
Short-sleeve shirt dress (thin)
Sleeveless, scoop neck (thin)
Sleeveless, scoop neck (thick)
Sweaters
Sleeveless vest (thin)
Sleeveless vest (thick)
Long-sleeve (thin)
Long -sleeve (thick)
Suit Jackets and Vests (lined)
Single-breasted (thin)
Single-breasted (thick)
Double breasted (thin)
Double breasted (thick)
Sleeveless vest (thin)
Sleeveless vest (thick)
Sleepwear and Robes
Sleeveless, short gown (thin)
Sleeveless, long gown (thin)
Short-sleeve hospital gown
Long-sleeve, long gown (thick)
Long-sleeve pajamas (thick)
Short-sleeve pajamas (thin)
Long-sleeve, long wrap robe
(thick)
Long-sleeve, short wrap robe
(thick)
Short sleeve, short robe (thin)
I/clo
0.14
0.23
0.33
0.47
0.29
0.23
0.27
0.13
0.22
0.25
0.36
0.36
0.44
0.42
0.48
0.10
0.17
0.18
0.20
0.31
0.46
0.57
0.42
0.69
0.48
0.34
3 "Thin" garments are made of lightweight, thin fabrics worn in the summer; "thick" garments are
heavy weight, thick fabrics worn in the winter.
Knee-length
300
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: HVAC Systems
Environmental indices that affect personnel comfort include factors such as temperature, humidity,
and air flow. Operating temperatures that take into account humidity can be determined using the following
equations.
h, +
To=aTr+(\-ot)Ta
where Tr = mean radiant temperature
Ta = dry bulb temperature
1 2
-< oc< —
3 3
Exhibit 10.18 lists equations for convection heat transfer coefficients for various activities.
Exhibit 10.18: Convection Heat Transfer Coefficients
Equation
Hc=0.061V°6
Hc=0.55
Hc=0.475+ 0.44V067
Hc=0.90
Hc=0.92V0.53
Hc=(M-0.85)° 39
Hc=0.146V°39
Hc=0.068V°69
Hc=0.70
Limits
40
-------
HVAC: HVAC Systems
Notes 10.2.3 General Types of Building Heating and Cooling
Exhibits 10.19 - 10.25 illustrate the various types of building heating and cooling systems that are
currently available. These include:
• Sprayed coil dehumidifier,
• Evaporative cooling and air washer,
• Humidity control through cooling override,
• Single zone - all direct control from space thermostat,
• Dual duct air handling system,
• Multi-zone air handling unit, and
• Hybrid VAV control system.
Exhibit 10.19: Sprayed Coil Dehumidifier
Exhibit 10.20: Evaporative Cooling & Air Washer
Spray
Nozzles
Pump
Eliminators
Air Ftow
Makeup
Water
302
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: HVAC Systems
Exhibit 10.21: Humidity Control Through Cooling Override
Ff om Supply Fun Star «w
r jMiiitfnuPA PotM t0f^ Swtic^i
L _A ~ ~ ""
Lj
" i
Asr Air
t, * i
, y I pM }....... _p!iv_ _
1 1 JI^J I L?.j 1
NC i fOM] W ii T
1 i s 1 L.
I /^"N _, ' ' NO 1 "
^JO ^ /L
111 " ' r p
1 r " ^
_______(i , T j
; 1 ^x
i ii '^T' '
tm
1
» t
^
»
i
8 4
HD
S 1
Ll
¥6
^
CHP
^
r
k
CC
CHS if-wm
1 i
1 !
UFu s of
-, JL^ Smoke
l»«I |T2^ JPBJ Doiocter
.; S
4-^'
"™i
rteuan^ Fittr L ^ Supply Fan
A if 1 3
i LOW T»»»lp.
f
Exhibit 10.22: Single Zone - All Direct Control from Space Thermostat
Fr om SuppJ)? Fan Slar las
Minimum Position Switch
I I
HI
Air
I
Air -
NC
HR
FJter
MO
HS
•CHS
MC
HC
iimi! |T?
Space !
Therm J
fa 9
-------
HVAC: HVAC Systems
Notes
Supply
Fan
Air
1
Exhibit 10.23: Dual Duct Air Handling System
)^
i Supply
KB
VI
IMS
'ing
Coil
Cooling
1 NO
OR
1
aacnmi-r-awr
| - 1_
"~~ I Cltlfilf
~
* T"
ffcP
Mlxmq
"
Exhibit 10.24: Multi-zone Air Handling Unit
Fan
1
1
Aif
+
>
i_X
asc
""""
Q/
Supply
MBA
M3
jrtsarirsf
!! €eil
V2
NC
/*
j T4i
CHR C4-IS
- BO3i_ _ _)
Zone
^
304
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: HVAC Systems
Exhibit 10.25: Hybrid VAV Control System
10.3 VENTILATION
Many operations require ventilation to control the level of dust, gases, fumes, or vapors. Excess
ventilation for this purpose can add significantly to the heating load. All air that is exhausted from the
building must be replaced by outside air.
During the heating season the air must be heated to room temperature by makeup air units or by
infiltration and mixing with room air. When process heating is also involved, excess ventilation results in a
loss of energy at all times.
A common problem during the winter heating season is negative building pressure resulting from
attempting to exhaust more air than can be supplied. The most obvious problem encountered with air
starvation is difficulty in opening doors. Negative pressure will lead to a number of other problems.
1. Heaters, ovens, and other plant equipment that depend on natural draft cannot operate properly under
negative pressure and their combustion efficiency drops.
2. Downdrafts can cause condensation and corrosion. Fumes can also be drawn into the plant,
affecting employee health and effectiveness.
3. Without proper exhaust, air stagnation creates concentrations of fumes or odors. Warm, moist air
may even condense on manufactured products or mechanical and electrical equipment.
4. Workers near the building's perimeters may be subjected to drafts as the pressure differential
between inside and outside draws cold air through doors and windows. Downdrafts can also occur
around ventilation hoods that are temporarily inoperative. Turning up the thermostat causes
employees in the middle of the building to roast and offers little help to those near the walls.
5. Exhaust fans cannot work at rated capacity under negative pressure causing dust, dirt, and
contaminants in the plant increase. Maintenance, housekeeping, and operating costs rise, and
equipment wears out much faster. If new exhaust fans are added without equivalent makeup air
capacity, equipment efficiency suffers.
Exhaust airflows are usually established for the more demanding winter conditions when negative
pressures may exist. Consequently, with no adjustment to the exhaust system during the non-heating season
when the building pressure is at equilibrium with the outside air, the exhaust rate will be greater. Where no
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
305
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HVAC: Ventilation
JT , process heating is involved, the resulting higher summer exhaust rate is not a problem. However, when
process heating is involved, such as with ovens, the higher exhaust rate will increase the heat loss.
10.3.1 Losses
Losses of air from buildings are inevitable. The air which was heated will slowly seep through gaps
around windows, doors and ducts. It is a phenomenon one has to deal with. On the other hand, not only that
the total elimination of air leaks would be prohibitively expensive, but also could cause condensation and/or
pressure inequality in the building with respect to the outside.
10.3.1.1 Room Air
The following two equations may be used to estimate makeup air heating costs on an hourly and
yearly basis.
Hourly Cost = 1.08 x cfm x At x (C/eff.)
Yearly Cost = (0.154 x cfm x D x dg x C) / eff.
where,
cfm = air volume, cfm
At = outside temperature - inside temperature, °F
C= cost of fuel, $/Btu
eff = heater efficiency; if unknown, use 0.80 for indirect-fired heater
D = operating time, hours/week
dg = annual degree days: 4,848 for New York City, New York or 5,930 for Pittsburgh,
Pennsylvania
For example, assume 10,000 cfm with 40°F outside temperature, operating 15 shifts per week.
Cost/hr= l.OSx 10,000 x (70-40) x ($3.00/106 Btu) x (1/80%) = $1.215
Annual Cost = 0.154 x 10,000 x 120 x 4,848 x ($3.00/106 Btu) x (1/80%) = $3,360
10.3.1.2 High-Temperature Exhaust
In the case of a high-temperature exhaust, as from an oven, the loss is magnified by the higher
temperatures of either the dry air or the air-water mixture. During the heating season, this loss also involves
heating an equivalent amount of makeup air to room temperature before further heating to exhaust
temperature in the oven.
An example of the potential saving for a reduction in exhaust for 1,000 cfm at 250°F is as follows:
1. Saving for heating outside air to 65°F, given:
cfm =1,000
D = 120 operating hours per week
dg = 2,500 degree days
C = $4.24/MMBtu heat in steam
Using the above formula:
Annual savings = 0.154 x 1,000 x 120 x 2,500 x ($4.24/106) = $196/yr
2. Saving for reduction in process heat load (250°F - 65°F)
Annual Savings = 1,000 x 1.08* x (250°F - 65°F) x 6,000 x ($4.24/106) " = $5,083/yr
Total Saving = $196 + $5,083 = $5,279/yr
305 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Ventilation
1.08 = 60 min/hr x 0.075 Ibs/cu ft x 0.24 specific heat of air
If a direct-fired gas makeup unit is used, the air is heated at nearly 100 percent efficiency.
For an indirect unit an efficiency of 80 percent or $3.75/MMBtu can be used.
Additional saving in fan horsepower is possible if fan speed is reduced.
10.3.1.3 Air-Water Mixture
The heat loss is considerably greater when water vapor is included with the exhaust, as occurs with
washing or drying. As an example of the heat loss from an exhaust including water vapor, the enthalpy of dry
air at 110°F is 26.5 Btu per pound; the enthalpy of a saturated mixture of air and water vapor is 87.5 Btu per
pound of dry air. The extent of this loss emphasizes the importance of using minimum exhaust where heated
baths are involved. A high temperature psychrometric chart can be used to determine enthalpies at other
conditions.
10.3.2 Balance Air Flows
Too often no provision is made to supply sufficient makeup air. Consequently, it must leak through
doors, windows, and stray openings, producing undesirable drafts in the vicinity of the leakage.
Barring the ability to make sufficient reduction in exhaust to balance the air supply and demand, the
best practice is to add more makeup air units to supply heated air in amounts equal to that exhausted and
distribute it in the region of the exhaust system. While this will contribute little to energy conservation, it will
eliminate the problems associated with negative pressure.
Plant personnel should check all exhausts to determine if losses can be reduced or eliminated.
Measures than can be taken to reduce exhaust losses are:
1. Shut off fans when equipment is down.
2. Reduce volume to a minimum.
3. Reduce temperature.
4. Recover exhaust.
10.3.2.1 Shut off Fans
The most obvious improvement is to shut off any exhaust fans that are not needed. Exhaust fans are
often left running even if the equipment they are ventilating is down. Some typical examples are spray
booths and ovens or dryers. Fans can also be left on during periods of no production, such as evenings or
weekends.
10.3.2.2 Reduce Volume
The next best improvement is to reduce exhaust rates to the minimum. Some reduction in existing
rates may be possible because:
1. Exhaust rates may have been established with a large margin of safety when energy costs were not a
significant factor.
2. The exhaust rate may have been increased at one time to resolve a temporary problem, which no
longer exists.
3. Rates may be set to satisfy the most extreme need, which may be far in excess of normal operation.
In the first case, a simple adjustment of the damper setting to reduce flow may be sufficient. Where
production loads fluctuate, the damper setting can be varied with the load when practical.
Often, one of the most direct and easiest means to reduce the volume of exhaust air is by proper
hood design. In many instances, equally effective ventilation can be provided with less exhaust by improving
the design of the exhaust hoods. The result is lower fan power consumption and reduced heat loss. In
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency 307
Notes
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HVAC: Ventilation
JT , general, the most effective hood designs are those which completely surround the emission source with
minimum openings to the surrounding area. The following are some guidelines for optimum hood design.
Enclosure
The more complete the enclosure, the less exhaust air is required. Exhaust hoods are commonly
located at a considerable distance from the surface of a tank. As a consequence, room air is exhausted along
with the fumes. Rates are also increased if control is upset by cross drafts in the area. The following steps
can provide a more complete enclosure.
1. Extend the hood vertically on one or more sides. This approach can be taken where access is not
necessary on all sides.
2. Provide a hanging drop cloth or plastic strips that will allow for access when necessary without
undue interference with operation.
Distance from Source
If enclosing the source with side panels is not practical, the hood should be as close as possible to the
source and shaped to control the area of contamination. The required volume varies as the square of the
distance from the source.
The addition of flanges will eliminate air flow from ineffective zones where no contaminant exists.
Air requirements can be reduced as much as 25 percent by incorporating flanges in the hood design.
Capture Velocity
The airflow past the source must be sufficient to capture the contaminant. However, if no standards
or arbitrary standards in excess of needs are used, proper capture velocity or volume should be determined to
avoid unnecessary exhaust.
Large Openings
Where exhaust openings are of necessity large in size, the hood can be made more effective by
incorporating multiple take-offs, slotted openings, baffles, etc. Hoods with this feature will provide more
uniform flow over the area to be ventilated and reduce total air requirements.
Outside Air
The introduction of outside air, where possible, at the point of ventilation will reduce the amount of
room air exhausted. Heating requirements will, therefore, be reduced to the extent the exhaust air includes
outside air instead of heated room air.
10.3.2.3 Reduce Temperature
Process requirements usually dictate the temperature at which the process must be maintained.
However, a review of conditions may indicate opportunities to reduce temperature in the following areas:
• Current practice maintains temperature above standard to provide a wide margin of safety.
• The standard was established arbitrarily or without adequate testing.
• The standard was established to handle a worst-case situation, which no longer exists or occurs
rarely (at which time exhaust rate could be increased).
10.3.2.4 Recover Heat
Heat recovery from the exhaust air should be considered after first completing the steps to reduce
exhaust loss by any of the above methods. Several precautions should be considered in the evaluation of a
heat recovery system.
1. Because air is less dense than water, large volumes of air are required to approach the equivalent Btu
content of wastewater. Where heat recovery from both systems cannot be beneficially utilized, a
308 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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HVAC: Ventilation
heat recovery system for water is generally preferable to air because of the former's better payback
and lower maintenance. The plant-wide potential for waste recovery should, therefore, be studied
first to ensure the design of any installation will be coordinated with an overall plan.
2. Any evaluation of savings must reflect the actual hours of use. For example, if air-to-air heat
recovery from an oven is planned for heating the building, the recovery system will be in use only
during the heating season. Furthermo re, if the oven is not operating continuously, the heat recovery
system will be available for this purpose for an even shorter period.
3. Although considerable heat may be lost in exhaust gases, especially when a number of sources are
involved, the potential for heat recovery is dependent on the temperature of the gases. When the
temperature range is low (200°F to 400°F), the potential for economical recovery is minimized.
4. The exhaust gases may contain some contaminants that will foul heat exchanger surfaces. In this
situation, the ease of cleaning the exchanger is of prime importance.
10.3.3 Types of Heat Exchangers
As the name indicates, the heat exchanger is a device where heat from one medium is transferred
into another. This way, some of the energy otherwise lost is used to help achieve desired conditions. Several
types of heat exchangers are available depending on the application.
10.3.3.1 Rotary Heat Exchanger
Because the matrix in this type of exchanger has fine air passages, the rotor may soon become
blocked if it is installed in an air stream containing contaminants. This heat exchanger has the highest
efficiency, recovering 70 to 85 percent of the exhaust energy, including both latent and sensible heat. It is
best suited to a clean air stream since some blockages of the exhaust air to the supply side can occur.
10.3.3.2 Sealed Heat Pipe Heat Exchanger
The heat pipe operates on the principle that when heat is applied to one end of a sealed tube,
evaporation of a fluid in the pipe occurs. The vapor flows to the cold end where it is condensed. The
condensed working fluid is then transported by capillary action to the warm end where the cycle is repeated.
In this exchanger, the fins mounted on the outside of the tube to aid heat transfer may also become blocked
with contaminants. Heat exchanger efficiency decreases when deposits build up on the surface, so keeping
the surfaces clean is important. The unit recovers 60 to 80 percent of the sensible heat.
The use of a filtering system and/or periodic cleaning are often necessary to ensure clean heat
transfer surfaces. The advantages of the heat pipe are minimal maintenance, because it contains no moving
parts; and no cross-contamination, because the exit and incoming gas streams are completely sealed off from
each other.
10.3.3.3 Plate Heat Exchanger
Heat transfer is accomplished by counter flowing two streams between plates. This type of
exchanger is less likely to become blocked with contaminants and is more easily cleaned. Maintenance is
also minimized because there are no moving parts. This type is suitable for either air-to-air or air-to-water
heat recovery. About 70 percent of the sensible heat is recovered by these units.
The equipment cost for an air-to-air heat exchanger from one manufacturer ranges from $0.60 to
$1.60 per cfm depending on the size, usage, efficiency, airflow, pattern, etc. An air-to-water heat exchanger
costs from $1.30 to $3.10 per cfm, again depending on efficiency, size, usage, etc. Installation costs range
from 1 to 2.5 times the cost of the equipment.
If the exhaust gases contain oil mists and other contaminants, some form of filter unit may be
necessary ahead of the heat exchanger. Either a conventional filter or electrostatic precipitator can be
considered.
10.3.3.4 Coil-Run-Around System
The above three types of heat exchangers require the supply and exhaust stream to be brought
together. A coil-run-around unit permits the two streams to be physically separated by using an intermediary
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
309
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HVAC: Ventilation
JT , fluid, usually ethylene glycol, to transfer energy between the two streams. The ethylene glycol is circulated
in a closed loop through heat exchangers in the "hot" and "cold" stream. Coil-run-around systems recover 60
to 65 percent of the sensible heat between the two streams.
10.3.3.5 Hot Oil Recovery System
This system has the advantages of eliminating heat exchanger fouling and reducing pollution
abatement problems. In this system, exhausts are passed through cool, cascading oil, which absorbs most of
the heat as well as the high boiling chemicals. The hot oil passes over exchange coils containing incoming
process water and is then recycled.
Where flammable solvents are used, lower flammable limit (LFL) monitoring equipment is
necessary. Improved LFL systems include self-checking equipment and completed control loops that allow
the use of modulated dampers to provide for minimal safe ventilation requirements. The self-checking
system eliminates much of the periodic need to calibrate and check the function of safety circuits.
Accordingly, exhaust reduction can be considered for drying ovens containing solvent vapors. The capital
expenditure for an LFL monitor is about $15,000.
REFERENCES
1. American Society of Heating, Refrigeration and Air Conditioning Engineers, Handbook of
Fundamentals, 1972
2. Sherratt, A.F.C., Energy Conservation and Energy Management in Buildings, Applied Science
Publishers, 1976
3. Southern California Gas Company, How to Save Energy in Commercial Buildings, Publication
7436
4. ASHRAE Standard 90-75, Energy Conservation in New Building Design, ASHRAE, 1975
5. Reay, D.A., Industrial Energy Conservation, Pergamon Press, 1977
6. Kenney, W.F., Energy Conservation in the Process Industries, Academic Press, 1984
7. Payne, G.A., The Energy Managers 'Handbook, IPC Science and Technology Press, 1977
310 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: EPA Regional Offices
APPENDIX A
EPA REGIONAL OFFICES
Region #
1
2
3
4
5
6
7
8
9
10
Area's Included
Maine, New Hampshire, Vermont,
Massachusetts, Rhode Island,
Connecticut
New York, New Jersey, Puerto
Rico, US Virgin Islands
Delaware, Maryland,
Pennsylvania, Virginia, West
Virginia, District of Columbia.
Mississippi, Tennessee, Alabama,
Georgia, Florida, Kentucky, South
Carolina, North Carolina
Illinois, Indiana, Michigan,
Minnesota, Ohio, Wisconsin
Arkansas, Louisiana, New
Mexico, Oklahoma, Texas
Iowa, Kansas, Missouri, Nebraska
Colorado, Montana, North
Dakota, South Dakota, Utah,
Wyoming
Arizona, California, Hawaii,
Nevada, Guam, American Samoa.
Alaska, Idaho, Oregon,
Washington
EPA Regional Address
EPA Regionl
John F. Kennedy Building
Boston, MA 02203
EPA Region 2
290 Broadway - 26th Floor
New York, New York 10007-1866
EPA Region 3
841 Chestnut Building
Philadelphia, PA 19107
EPA Region 4
Atlanta Federal Center
61 Forsyth Street, SW
Atlanta, Georgia 30303-3104
EPA Region 5
77 W Jackson Blvd
Chicago, IL 60604
EPA Region 6 Main Office
1445 Ross Avenue
Suite 1200
Dallas, Texas 75202
EPA Region 7
726 Minnesota Ave.
Kansas City, Kansas 66101
EPA Region 8 Office
999- 18th St., Suite 500
Denver, Colorado 80202
EPA Region 9 Office
75 Hawthorne Street
San Francisco, CA 94105
EPA Region 10
1200 6th Avenue
Seattle, WA 98101
Regional Phone #
(888)EPA-7341
(212) 637-5000
(215) 566-2900
(404) 562-9900
(312) 353-2000
(214) 665-2200
(913) 551-7003
(303)312-6312
(415)744-1500
(206) 553-1200
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-l
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Appendix A: Energy Conservation Resources
ENERGY CONSERVATION RESOURCES
1. Silver, Daniel M. "The Sustainable Energy Guide: International Resources for Energy-Efficiency and
Renewable Energy." International Institute for Energy Conservation Publications, Washington DC,
1994.
2. Energy Conservation Program Guide for Industry and Commerce, NBS Handbook 115 and Supplement,
U. S. Department of Commerce and Federal Administration, U. S. Government Printing Office, 1975.
3. Industrial Market and Energy Management Guide, American Consulting Engineers Council, Research
and Management Foundation, 1987.
4. Levers, W.D., The Electrical Engineer's Challenge in Energy Conservation., IEEE Trans. Of Industrial
Applications, 1 A-11,4,1975
5. Windett, A.S., Reducing the Cost of Electricity Supply, Gower Press, 1973
6. Zackrison, H.B., Energy Conservation Techniques for Engineers, Van Nostrand Reinhold Company,
1984.
7. California Environmental Protection Agency, Waste Audit Study of the Electric Utility Industry, Cal-
EPA, Department of Toxic substance Control, December 1991.
8. Flavin, Christopher and Alan B. Durning. Building on Success: The Age of Energy Efficiency.
WorldWatch Institute, Washington, D.C., 1988.
9. Gulp, Archie W. Principles of Energy Conversion. McGraw-Hill, New York, 1991.
10. Freeman, S. David. Energy: The New Era. Walker, New York, 1974.
11. Shinskey, F. Greg. Energy Conservation Through Control. Academic Press, New York, 1978.
12. Dumas, Lloyd J. The Conservation Response: Strategies for the Design and Operation of Energy-Using
Systems. Lexington Books, Lexington, Mass, 1976.
13. Hafemeister, David W. Energy Sources: Conservation and Renew able s. AIP Conference Proceedings,
American Institute of Physics, New York, 1985.
14. Stasiowski, Frank A. Nine Hundred and Forty Three Ways to Save Energy. Practice Management
Associates, Ltd., Newton, Massachusetts, 1991.
15. Kreith, Frank and George Burmeister. Energy Management and Conservation. National Conference of
State Legislatures, Denver, CO, 1993.
16. Geller, Howard S. and John M. DeCicco. Energy Efficiency and Job Creation: The Employment and
Income Benefits from Investing in Energy Conserving Technologies. American Council for an Energy
Efficient Economy, Washington, D.C., 1992.
17. Watson, Donald. Energy Conservation Through Building Design. McGraw-Hill, New York, 1979.
18. Institute of Electrical and Electronics Engineers. IEEE Recommended Practice Energy Conservation and
Cost-Effective Planning in Industrial Facilities. IEEE , New York, 1984.
19. Kreith, Frank and Ronald West. CRC Handbook of Energy Efficiency. CRC Press, Boca Raton, 1997.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix A: Pollution Prevention Publications
POLLUTION PREVENTION PUBLICATIONS
Title EPA Document Number
The Automotive Refinishing Industry.
The Automotive Repair Industry.
The Commercial Printing Industry.
The Fabricated Metal Products Industry.
The Fiberglass-Reinforced And Composite Plastics Industry.
The Marine Maintenance And Repair Industry.
The Mechanical Equipment Repair Industry.
Metal Casting And Heat Treating Industry.
The Metal Finishing Industry.
Municipal Pretreatment Programs.
Non-Agricultural Pesticide Users.
The Paint Manufacturing Industry.
The Pesticide Formulating Industry.
The Pharmaceutical Industry.
The Photoprocessing Industry.
The Printed Circuit Board Manufacturing Industry.
Research And Educational Institutions.
Selected Hospital Waste Streams.
Wood Preserving Industry.
OTHER MANUALS'
Facility Pollution Prevention Guide
Opportunities For Pollution Prevention Research To Support the
33/50 Program
Life Cycle Design Guidance Manual.
Life Cycle Assessment: Inventory Guidelines and Principles
Pollution Prevention Case Studies Compendium
Industrial Pollution Prevention Opportunities For The 1990's EPA
EPA 625/791/016
EPA 625/791/013
EPA 625/790/008
EPA 625/790/006
EPA 625/791/014
EPA 625/791/015
EPA 625/R92/008
EPA 625/R-92-009
EPA625/R92/011
EPA 625/R93/006
EPA 625/R93/009
EPA 625/790/005
EPA 625/790/004
EPA 625/791/017
EPA 625/791/012
EPA 625/790/007
EPA 625/790/010
EPA 625/790/009
EPA625/R93/014
EPA625/R92/088
EPA/600/R92/175
EPA/600/R92/226
EPA/600/R92/245
EPA/600/R92/046
EPA/600/891/052
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-3
-------
Appendix A: Pollution Prevention Publications
Notes
Title
EPA Document Number
Achievements In Source Reduction And Recycling For Ten
Industries In The United States
Background Document On Clean Products Research And
Implementation
Opportunities For Pollution Prevention Research To Support
The33/50 Program
Waste Minimization Practices At Two CCA Wood Treatment Plants
WMOA Report And Summary - Fort Riley, Kansas
WMOA Report And Summary - Philadelphia Naval Shipyard/
Governors Island
Management Of Household And Small-Quality-Generator
Hazardous Waste In The United States
WMOA Report And Summary - Naval Undersea Warfare
Engineering Station, Report, WA
WMOA Report And Summary - Optical Fabrication Laboratory,
Fitzsimmins Army Medical Center, Denver, Colorado
WMOA Report And Summary - A Truck Assembly Plant
WMOA Report And Summary - A Photofinishing Facility
WMOA Report And Summary - Scott Air Force Base
Guidance Document For The Write Pilot Program With State And
Local Governments
Machine Coolant Waste Reduction By Optimizing Coolant Life
Recovery Of Metals Using Aluminum Displacement
Metal Recovery/Removal Using Non-Electrolytic Metal Recovery
Evaluation Of Five Waste Minimization Technologies At The
General Dynamics Pomona Division Plant
An Automated Aqueous Rotary Washer For The Metal Fabrication
Industry
Automotive And Heavy Duty Engine Coolant Recycling By
Filtration
Automotive And Heavy Duty Engine Coolant Recycling By
Distillation
Onsite Waste Ink Recycling
Diaper Industry Workshop Report
EPA/600/291/051
EPA/600/290/048
EPA/600/R92/175
EPA/600/R93/168
EPA/600/S2-90/031
EPA/600/S2-90/062
EPA/600/S2-89/064
EPA/600/S2-91/030
EPA/600/S2-91/031
EPA/600/S2-91/038
EPA/600/S2-91/039
EPA/600/S2-91/054
EPA/600/S8-89/070
EPA/600/S2-90/033
EPA/600/S2-90/032
EPA/600/S2-90/033
EPA/600/S2-91/067
EPA/600/Sr-92/188
EPA/600/S2-91/066
EPA/600/Sr-92/024
EPA/600/Sr-92/251
EPA/600/S2-91/251
A-4
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Pollution Prevention Publications
Title
EPA Document Number
Industrial Pollution Prevention Opportunities For The 1990's
Hospital Pollution Prevention Case Study
Waste Minimization Audit Report: Case Studies Of Minimization Of
Cyanide Waste From Electroplating Operations
Waste Minimization Audits At Generators Of Corrosive And Heavy
Metal Wastes
Waste Minimization Audit Report: Case Studies Of Minimization Of
Solvent Wastes From Parts Cleaning And From Electronic Capacitor
Manufacturing Operations
Waste Minimization In The Printed Circuit Board Industry - Case
Studies
Waste Minimization Audit Report: Case Studies Of Minimization Of
Solvent Wastes And Electroplating Wastes At A DOD Installation
Waste Minimization Audit Report: Case Studies Of Minimization Of
Mercury -Bearing Wastes At A Mercury Cell Chloralkali Plant
Pollution Prevention Opportunity Assessment: USDA Beltsville
Agricultural Research Center, Beltsville, Maryland
Pollution Prevention Opportunity Assessment For Two Laboratories
At Sandia National Laboratories
Ink And Cleaner Waste Reduction Evaluation For Flexographic
Printers
Mobile Onsite Recycling Of Metalworking Fluids
Evaluation Of Ultrafiltration To Recover Aqueous Iron Phosphating/
Degreasing Bath
Recycling Nickel Electroplating Rinse Waters By Low Temperature
Evaporation And Reverse Osmosis
WASTE MINIMIZATION ASSESSMENT FOR:
Aerial Lifts.
Aluminum And Steel Parts.
Aluminum Cans.
Aluminum Extrusions.
Automotive Air Conditioning Condensers And Evaporators.
Baseball Bats And Golf Clubs.
Caulk.
EPA/600/Sr-91/052
EPA/600/S2-91/024
EPA/600/S2-87/055
EPA/600/S2-87/056
EPA/600/S2-87/057
EPA/600/S2-88/008
EPA/600/S2-88/010
EPA/600/S2-88/011
EPA/600/Sr-93/008
EPA/600/Sr-93/015
EPA/600/Sr-93/086
EPA/600/Sr-93/114
EPA/600/Sr-93/144
EPA/600/Sr-93/160
EPA600/S-94-011
EPA 600/S-94-010
EPA600/M91/025
EPA 600/S-92-010
EPA600/S-92-007
EPA600/S-93-007
EPA600/S-94-017
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-5
-------
Appendix A: Pollution Prevention Publications
Notes
Title
EPA Document Number
Can-Manufacturing Equipment.
Chemicals.
Commercial Ice Machines And Ice Storage Bins.
Components For Automobile Air Conditioners.
Compressed Air Equipment Components.
Custom Molded Plastic Products.
Cutting And Welding Equipment.
Electrical Rotating Devices.
Felt Tip Markers, Stamp Pads, And Rubber Cement.
Fine Chemicals Using Batch Processes.
Finished Metal And Plastic Parts.
Finished Metal Components.
Gravure-Coated Metalized Paper And Metalized Film
Heating, Ventilating, And Air Conditioning Equipment.
Industrial Coatings.
Injection-Molded Car And Truck Mirrors.
Iron Castings And Fabricated Sheet Metal Parts.
Labels And Flexible Packaging.
Machined Parts.
Metal Bands, Clamps, Retainers, And Tooling.
Metal-Plated Display Racks.
Microelectronic Components.
Military Furniture.
Motor Vehicle Exterior Mirrors.
New And Reworked Rotogravure Printing Cylinders.
Orthopedic Implants.
Outdoor Illuminated Signs.
Paper Rolls, Ink Rolls, Ink Ribbons, And Magnetic And Thermal
Transfer Ribbons.
EPA 600/S-92-014
EPA 600/S-92-004
EPA 600/S-92-012
EPA 600/S-92-009
EPA 600/M91/024
EPA 600/S-92-034
EPA 600/S-92-029
EPA600/S-94-018
EPA600/S-94-013
EPA 600/S-92-055
EPA 600/S-94-005
EPA 600/S-92-030
EPA 600/S-94-008
EPA600/M91/019
EPA600/S-92-028
EPA 600/S-92-032
EPA 600/S-95-008
EPA 600/S-95-004
EPA600/S-92-031
EPA600/S-92-015
EPA600/S-92-019
EPA600/S-94-015
EPA 600/S-92-017
EPA 600/S-92-020
EPA 600/S-95-005
EPA 600/S-92-064
EPA600/M91/016
EPA 600/S-95-003
A-6
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Pollution Prevention Publications
Title
EPA Document Number
Parts For Truck Engines
Penny Blanks And Zinc Products.
Permanent-Magnet DC Electric Motors.
Pliers And Wrenches.
Prewashed Jeans.
Printed Circuit Boards.
Printed Circuit Boards.
Printed Labels.
Printed Plastic Bags.
Product Carriers And Printed Labels.
Prototype Printed Circuit Boards.
Rebuilt Railway Cars And Components.
Refurbished Railcar Bearing Assemblies.
Rotogravure Printing Cylinders.
Screwdrivers.
Sheet Metal Cabinets And Precision Metal Parts.
Sheet Metal Components.
Silicon-Controlled Rectifiers And Schottky Rectifiers.
Surgical Implants.
Treated Wood Products.
Water Analysis Instrumentation
WASTE REDUCTION ACTI VIES AND OPTIONS FOR A:
Printer Of Forms And Supplies For The Legal Profession
Nuclear Powered Electrical Generating Station
State DOT Maintenance Facility
Local Board Of Education In New Jersey
Manufacturer Of Finished Leather
Manufacturer Of Paints Primarily For Metal Finishing
Manufacturer Of Writing Instruments
EPA 600/S-94-019
EPA600/S-92-037
EPA 600/S-92-016
EPA600/S-94-004
EPA 600/S-94-006
EPA600/M91/022
EPA 600/S-92-033
EPA600/M91/047
EPA600/M/90/017
EPA600/S-93-008
EPA 600/M91/045
EPA600/M91/017
EPA 600/M91/044
EPA 600/S-93-009
EPA600/S-94-003
EPA 600/S-92-021
EPA600/S-92-035
EPA 600/S-92-036
EPA600/S-94-009
EPA 600/S-92-022
EPA 600/S-92-013
EPA/600/S-92/003
EPA/600/S-92/025
EPA/600/S-92/026
EPA/600/S-92/027
EPA/600/S-92/039
EPA/600/S-92/040
EPA/600/S-92/041
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-7
-------
Appendix A: Pollution Prevention Publications
Notes
Title
EPA Document Number
Manufacturer Of Room Air Conditioner Units And Humidifiers
Autobody Repair Facility
Fabricator And Finisher Of Steel Computer Cabinets
Manufacturer Of Artists' Supply Paints
Manufacturer Of Wire Stock Used For Production Of Metal Items
Manufacturer Of Commercial Refrigeration Units
Waste Reduction: Pollution Prevention Publications Transporter Of
Bulk Plastic Pellets
Manufacturer Of Electroplated Wire
Manufacturer Of Systems To Produce Semiconductors
Remanuf acture Of Automobile Radiators
Manufacturer Of Fire Retardant Plastic Pellets And Hot Melt
Adhesives
Printing Plate Preparation Section Of A Newspaper
Manufacturer Of General Purpose Paints And Painting Supplies
Manufacturer Of Fine Chemicals Using Batch Processes
Laminator Of Cardboard Packages
Manufacturer Of Hardened Steel Gears
Scrap Metal Recovery Facility
Manufacturer Of Electroplating Chemical Products
Manufacturer Of Plastic Containers By Injection Molding
Fossil Fuel-Fired Electrical Generating Station
Manufacturer Of Commercial Dry Cleaning Equipment
Electrical Utility Transmission System Monitoring And Maintenance
Facility
Manufacturer Of Orthopedic Implants
EPA/600/S-92/042
EPA/600/S-92/043
EPA/600/S-92/044
EPA/600/S-92/045
EPA/600/S-92/046
EPA/600/S-92/047
EPA/600/S-92/048
EPA/600/S-92/049
EPA/600/S-92/050
EPA/600/S-92/051
EPA/600/S-92/052
EPA/600/S-92/053
EPA/600/S-92/054
EPA/600/S-92/055
EPA/600/S-92/056
EPA/600/S-92/057
EPA/600/S-92/058
EPA/600/S-92/059
EPA/600/S-92/060
EPA/600/S-92/061
EPA/600/S-92/062
EPA/600/S-92/063
EPA/600/S-92/064
A-8
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
TECHNOLOGY TRANSFER INFORMATION SOURCES
GOVERNMENT- NATIONAL
Provider: Asbestos Abatement/Management Ombudsman
Telephone: (703) 305-5938 or (800) 368-5888
Hours: 8:00 a.m. - 4:30 p.m. (EST) M-F
Abstract: The assigned mission of the Asbestos Ombudsman is to provide to the public information
on handling, abatement, and management of asbestos in schools, the work place, and the home. Interpretation
of the asbestos in schools requirements is provided. Publications to explain recent legisktion are also
available. Services are provided to private citizens, community services, state agencies, local agencies, local
public and private school systems, abatement contractors, and consultants.
Provider: Association of Small Business Development Centers
Membership: State small business development centers
Name: Jim King
Position: Chairman, Government Relations
Telephone: (518) 443-5398
Fax: (518)465-4992
E-mail: kingi (S.svsadm. sunv. edu
Name: Kathleen Dawson
Position: Executive Director
Telephone: (703) 448-6124
Fax: (703)448-6125
Provider: U. S. EPA Small Business Ombudsman Clearinghouse/Hotline
Telephone: (703) 305-5938, (800) 368-5888
Hours: Message recorder is on 24 hours a day.
Abstract: The mission of the U.S. EPA Small Business Ombudsman Clearinghouse/Hotline is to
provide information to private citizens, small communities, small business enterprises, and trade associations
representing the small business sector regarding regulatory activities. Technical questions are answered
following appropriate contacts with program office staff members. Questions addressed cover all media
program aspects within U.S. EPA.
Provider: Green Lights and Energy Star Programs
Telephone: (202) 775-6650, (888) STAR-YES [782-7937]
Abstract: The success of the Green Lights program depends on the actions taken by Partners and
Allies to implement energy-efficient lighting upgrade projects, ultimately resulting in sustained pollution
prevention. U.S. EPA's participant support programs provide planning and implementation guidance for
successful lighting upgrade projects. U.S. EPA offers four types of support programs: Information, Planning,
Analysis Tools, and Communications.
Provider: Indoor Air Quality Information Clearinghouse (IAQINFO)
Telephone: (800) 438-4318
Fax: (202)484-1510
E-mail: iaqinfofSlaol.com
Hours: 9:00 a.m. to 5:00 p.m. (EST), M-F; after-hours voice mail
Abstract: The purpose of the IAQINFO is to help you locate information to answer your questions
about indoor air pollution. IAQINFO can provide information on (1) the sources, health effects, testing and
measuring, and controlling indoor air pollutants; (2) constructing and maintaining homes and buildings to
minimize indoor air quality problems; (3) existing standards and guidelines related to indoor air quality; and
(4) general information on Federal and State legislation.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-9
Notes
-------
Appendix A: Technology Transfer Information Sources
JT , Provider: Information Resources Center (formerly the library)
Telephone: (202) 260-5922
Hours: 8:00 am. - 5:00 p.m., M-F (walk-in)
E-mail: librarvhq(5),epamail.epa. gov
Abstract: The Information Resources Center is open to U.S. EPA personnel and the public. It
provides access to U.S. EPA publications, books and journals related to environmental issues, and to the
Federal regulations.
Provider: National Radon Helpline
Telephone: (800) 55-RADON [557-2366]
Abstract: The National Radon Helpline provides general information and respond to consumer
questions on radon.
Provider: National Response Center
Telephone: (800) 424-8802
Abstract: The National Response Center (NRC) is the federal government's national communications
center, and is staffed 24 hours a day by U.S. Coast Guard. The NRC receives all reports of releases involving
hazardous substances and oil that trigger the federal notification requirements under several laws. Reports to
the NRC activate the National Contingency Plan and the federal government's response capabilities. It is the
responsibility of the NRC staff to notify the pre-designated on-scene coordinator (OSC) assigned to the area
of the incident and to collect available information on the size and nature of the release, the facility or vessel
involved, and the party(ies) responsible for the release. The NRC maintains reports of all releases and spills in
a national database called the Emergency Response Notification System.
Provider: National Small Flows Clearinghouse
Telephone: (800) 624-8301, (304) 293-4191
Hours: 8:00 am. - 5:00 p.m. (EST) M-F
Abstract: The National Small Flows Clearinghouse was established to provide small communities
with information and technical assistance to address wastewater treatment issues.
Provider: Oil Spill Program Information Line
Telephone: (202) 260-2342
E-mail: oilinfo(g)epamail.epa. gov
Abstract: U.S. EPA maintains an oil spill program information line to answer questions and provide
information to the public and owners and operators of regulated facilities on the following topics: Facility
Response Plan rulemaking, Emergency Response Notification System (ERNS), NCP product schedule, and
other questions related to U. S. EPA's oil spill program.
Provider: Radon Fix-It Line
Telephone: (800) 644-6999
Hours: 12:00 p.m. and 8:00 p.m. (EST), M-F
Abstract: The Consumer Research Council, a nonprofit consumer organization, operates the Radon
Fix-it Line, which is free of charge. The Radon Fix-it Line provides guidance and encouragement to
consumers with elevated radon levels of 4 pCi/L or higher to take the necessary steps toward fixing their
homes.
Provider: Safe Drinking Water Hotline
Telephone: (800) 426-4791
Hours: 9:00 am. - 5:30 p.m. (EST), M-F
E-mail: hotline-sdwa@epamail.epa.gov
Abstract: The Hotline assists Public Water Systems, State and local officials, and members of the
public with information on U.S. EPA regulations and programs authorized by the Safe Drinking Water Act
Amendments of 1986 and 1996. This includes drinking water regulations, other related drinking water topics,
wellhead protection and ground water protection program information.
A-10 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
GOVERNMENT - REGIONAL
Provider: National Response Center - regional programs
Telephone:
Region I
Region II
Region III
Region IV
Region V
Region VI
Region VII
Region VIII
Region IX
Region X
(617)223-7265
(732) 548-8730
(215)566-3255
(404) 562-8700
(312)353-2318
(214) 665-2222
(913)281-0991
(303) 293-1788
(415)744-2000
(206) 553-1263
Provider: Region I Air Quality Information Line
Telephone: (617) 565-9145
Abstract: The Air Quality Information Line is a voice mail system that routes the caller to the
appropriate Region I air quality point of contact for the purpose of lodging complaints, asking questions,
requesting information, and providing tips.
Provider: Region I General Information
Telephone: (617) 565-3420
Abstract: This is the telephone number for the operator and employee locator for Region I.
Questions, requests for information, and complaints are routed to the appropriate office or person.
Provider: Region II Superfund Investigators Hotline
Telephone: (800)245-2738
Abstract: This hotline is exclusively for the public with potential information on Superfund sites.
Provider: Region II Superfund Ombudsman
Telephone: (888) 283-7626
Abstract: The Ombudsman assists the public and regulated community in resolving problems
concerning any requirement under Superfund. The Ombudsman handles complaints from citizens and the
regulated community, obtains facts, sorts information, and substantiates policy.
Provider: Region III Customer Service Hotline
Telephone: (800) 438-2474 (within Region III)
(215) 566-5122 (outside Region III)
Abstract: The Customer Service Hotline provides general information to the public regarding the
Region and its programs. The hotline also sends out materials, and refers inquiries to the appropriate office or
person.
Provider: Region III Small Business Assistance Center
Telephone: (800) 228-8711 (within Region III)
(215) 566-5122 (outside Region III)
Abstract: The center helps small businesses comply with U.S. EPA regulations.
Provider: Region III Superfund Ombudsman
Telephone: (800) 553-2509(within Region III)
(215) 566-5122 (outside Region III)
Abstract: The Ombudsman assists the public and regulated community in resolving problems
concerning any requirement under Superfund. The Ombudsman handles complaints from citizens and the
regulated community, obtains facts, sorts information, and substantiates policy.
Provider: Region IV Helpline
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-ll
Notes
-------
Notes
Appendix A: Technology Transfer Information Sources
Telephone: (800)241-1754
Abstract: The Region IV Helpline provides general information to the public regarding the Region
and its programs. The helpline also sends out materials upon request, and refers inquiries to the appropriate
office or person.
Provider: Region VIIU. S. EPA Action Line
Telephone: (913) 551-7122 (Kansas City calling area)
(800) 223-0425
Abstract: The action line provides assistance to citizens on any issue under U.S. EPA's purview. The
Action Line receives all incoming inquiries and refers them to the appropriate offices.
Provider: Region IX Public Information Center
Telephone: (415) 744-1500
Hours: 8:00 am. -12:00 p.m. and 1:00 p.m. - 4:00 p.m., M-F
Abstract: The Region IX Public Information Center provides general information to the public
regarding the Region and its programs. The Center also sends out materials upon request, and refers inquiries
to the appropriate office or person.
Provider: Region IX RCRA Hotline/Information Line
Telephone: (415)744-2074
Hours: 1:00 p.m. - 4:00 p.m., M-F
Abstract: The RCRA Hotline/Information Line general information to the public regarding the RCRA
regulatory requirements and related issues. The information line also routes inquiries to the appropriate office
or person.
GOVERNMENT - STATE
Provider: Alabama Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.adem.state.al.us
Affiliations: Alabama Department of Environmental Management, Air Division
Name: James Moore
Position: Program Manager
Telephone: (334)271-7861
Fax: (334)271-7950
E-mail: Rbr(g).adem. state, al. us
Name: Toll Free Hotline (National)
Telephone: (800) 533-2336
Provider: Alabama Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Internet URL: www.cba.ua.edu/~cba/sbdc.html
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: John Sandefur
Position: State Director
Telephone: (205) 934-7260
Fax: (205) 934-7645
E-mail: asbdOOS @.uabdpo .dpo.uab.edu
Provider: Alaska Small Business Assistance Program
Membership: Businesses classified as non-major sources
A-12
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.state.ak.us/akdec
Affiliations: Alaska Department of Environmental Conservation
Name: David Wigglesworth
Position: Acting Director
Telephone: (907)269-7571
Fax: (907) 269-7600
E-mail: CompAsst@.envircon. state, ak. us
Name: Scott Lytle
Position: Manager
Name: Toll Free Hotline (State)
Telephone: (800)510-2332
Notes
Provider: Alaska Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Jan Fredericks
Position: State Director
Telephone: (907) 274-7232
Fax: (907)274-9524
E-mail: ani af@.uaa. alaska. edu
Provider: Arizona Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. adeq. state. az.us/admin/do/comp.htm
Affiliations: Arizona Department of Environmental Quality, Customer Service
Name: Gregory Workman
Position: Program Manager
Telephone: (602) 204-4337
Fax: (602) 207-4872
E-mail: workman. gregory@,ev.state.az.us
Name: Toll Free Hotline (State)
Telephone: (800) 234-5677
Provider: Arizona Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.dist.maricopa.edu/sbdc
Affiliations: Association of Small Business Development Centers
Maricopa Community College
U. S. Small Business Administration
Name: Michael York
Position: State Director
Telephone: (602) 731 -8722
Fax: (602)731-8729
E-mail: vorkfSlmaricopa.edu
Provider:
Arkansas Small Business Assistance Program
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-13
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Appendix A: Technology Transfer Information Sources
Notes
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Arkansas Department of Pollution Control and Ecology
Name: Robert Graham
Position: Small Business Ombudsman
Telephone: (501) 682-0708
Fax: (501) 682-0707
E-mail: help -sba@.adea. state, ar.us
Provider: Arkansas Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.ualr.edu/~sbdcdept
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of Arkansas at Little Rock
Name: Janet Nye
Position: State Director
Telephone: (501) 324-9043
Fax: (501) 324-9049
E-mail: imnvefSlualr.edu
Provider: California Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.arb.ca.gov/cd/cd.htm
Affiliations: California Environmental Protection Agency, Air Resources Bureau
Name: Peter Venturini
Position: Director
Telephone: (916) 445-0650
Fax: (916) 327-7212
E-mail: helplinefSlarb.ca. gov
Name: Toll Free Hotline (State)
Telephone: (800) 272-4572
Provider: California Small Business Development Center Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.commerce.ca. gov/small
Affiliations: Association of Small Business Development Centers
Name: Kim Neri
Position: State Director
Telephone: (916) 324-5068
Fax: (916) 324-5084
E-mail: kimn(5),smtp. doc, ca. gov
Provider: California South Coast Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. aqmd. gov/business
A-14
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Affiliations: California South Coast Air Quality Management District
Name: Natalia Porche
Position: Director
Telephone: (909)396-3218
Fax: (909) 396-3335
Name: Toll Free Hotline (National)
Telephone: (800) 388-2121
Provider: Colorado Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. state. co.us/gov_dir/regulatory_dir/orr.htm
Affiliations: Colorado Department of Health, Air Pollution Control Division
Name: Nick Melliadis
Position: Director
Telephone: (303) 692-3175
Fax: (303)782-5493
Name: Toll Free Hotline
Telephone: (800) 333-7798
Provider: Colorado Small Business Development Center Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. state. co.us/gov_dir/obd/sbdc.htm
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Joseph Bell
Position: State Director
Telephone: (303) 892-3809
Fax: (303) 892-3848
E-mail: sbdclcl(Slattmail_com
Name: Toll Free Hotline
Telephone: (800) 726-8000
Provider: Connecticut Small Business Assistance Program
Membership : Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Connecticut Department of Environmental Protection
Name: Glen Daraskevich
Position: Program Manager
Telephone: (860) 424-3545
Fax: (860)424-4063
Provider: Connecticut Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.sbdc.uconn.edu
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
University of Connecticut
Name: Dennis Gruell
Notes
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A-15
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Appendix A: Technology Transfer Information Sources
Notes
Position: State Director
Telephone: (860) 486-4135
Fax: (860)486-1576
E-mail: gruell@,ct. sbdc.uconn.edu
Provider: Delaware Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.dnrec.state.de.us/tbusperm.htm
Affiliations: Delaware Department of Natural Resource Conservation
University of Delaware
Name: George Petitgout
Position: Small Business Ombudsman
Telephone: (302) 739-6400
Fax: (302) 739-6242
Name: Phil Cherry
Position: Program Director
Provider: Delaware Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: Clinton Tymes
Position: State Director
Telephone: (302) 831-1555
Fax: (302)831-1423
E-mail: 43220@brahms.udel.edu
Provider: District of Columbia Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: District of Columbia ERA, Air Resources Management Division
Name: Olivia Achuko
Position: Program Manager
Telephone: (202) 645-6093
Fax: (202) 645-6102
Provider: District of Columbia Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.cldc.howard.edu/~husbdc
Affiliations: Association of Small Business Development Centers
Howard University
U.S. Small Business Administration
Name: Woodrow McCutchen
Position: Executive Director
Telephone: (202) 806-1550
Fax: (202) 806-1777
E-mail: husbdcfSlcldc. howard.edu
A-16
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Appendix A: Technology Transfer Information Sources
Provider: Florida Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. dep. state.fl. us/air/pro grams/sbap/index.htm
Affiliations: Florida Department of Environmental Protection, Bureau of Air Regulations
Name: Bob Daugherty
Position: SBAP Principal
Telephone: (904)488-1344
Fax: (904) 922-6979
E-mail: cl ark_l fg).dep. state. fl. us
Name: Toll Free Hotline (State)
Telephone: (800) 722-7457
Provider: Florida Small Business Development Center Network
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. f sbdc. uwf. edu
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of West Florida
Name: Jerry Cartwright
Position: State Director
Telephone: (904) 444-2060
Fax: (904) 444-2070
E-mail: fsbdc@uwf.edu
Provider: Georgia Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.DNR. State. Ga.US/dnr/environ
Affiliations: Georgia Department of Natural Resources, Air Protection Bureau
Name: Anita Dorsey-Word
Position: Program Manager
Telephone: (404) 362-2656
Fax: (404)363-7100
Provider: Georgia Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.sbdc.uga.edu
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
University of Georgia
Name: Henry Logan, Jr.
Position: State Director
Telephone: (706) 542-6762
Fax: (706) 542-6776
E-mail: sbdcdir(g),uga. cc.uga.edu
Provider: Hawaii Small Business Assistance Program
Membership: Businesses classified as non-major sources
Notes
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A-17
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Notes
Appendix A: Technology Transfer Information Sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Hawaii Department of Health, Clean Air Branch
Name: Robert Tarn
Position: Program Manager
Telephone: (808) 586-4200
Fax: (808) 586-4370
Provider: Hawaii Small Business Development Center Network
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.maui. com/~sbdc/hilo.html
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of Hawaii at Hilo
Name: Darryl Mleynek
Position: State Director
Telephone: (808) 974-7515
Fax: (808) 974-7683
E-mail: darrvlm(5),interpac.net
Provider: Idaho Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Idaho Department of Environmental Quality
Name: Doug McRoberts
Position: Small Business Ombudsman
Telephone: (208) 373-0298
Fax: (208) 373-0417
E-mail: dmcrober(g)deq.state.id.us
Provider: Idaho Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.idbsu.edu/isbdc
Affiliations: Association of Small Business Development Centers
Boise State University
U.S. Small Business Administration
Name: Jame Hogge
Position: State Director
Telephone: (208) 385-1640
Fax: (208) 385-3877
E-mail: ihogge@bsu.idbsu.edu
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Appendix A: Technology Transfer Information Sources
Provider: Illinois Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. commerce. state. il. us
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Jeff Mitchell
Position: State Director
Telephone: (217) 524-5856
Fax: (217)524-0171
E-mail: j eff. mitchell@.accessil. com
Name: Toll Free Hotline (State)
Telephone: (800)252-3998
Provider: Illinois Small Business Environmental Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.commerce.state.il.us/dcca/files/fs/ba/ba35.htm
Affiliations: Illinois Department of Commerce and Community Affairs
Name: Mark Enstrom
Position: Program Manager
Telephone: (217) 524-0169
Fax: (217) 785-6328
Provider: Indiana Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.state.in.us
Affiliations: Indiana Department of Environmental Mgmt, Office of Pollution Prevention
Name: Maggie Me Shane
Position: Office of Business Relations
Telephone: (317) 232-5964
Fax: (317)233-5627
Provider: Indiana Small Business Development Center Network
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Stephen Thrash
Position: Executive Director
Telephone: (317)264-6871
Fax: (317)264-3102
E-mail: sthrashfSlin.net
Name: Toll Free F ax on Demand Hotline
Fax: (800) 726-8000
Provider: Iowa Air Emissions Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Notes
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A-19
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Notes
Appendix A: Technology Transfer Information Sources
Internet URL: www.iwrc.org
Affiliations: Iowa Waste Reduction Center
University of Northern Iowa
Name: John Konefes
Position: Director
Telephone: (319) 273-2079
Fax: (319)273-2926
Name: Toll Free Hotline (State)
Telephone: (800)422-3109
Provider: Iowa Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.iowasbdc.org
Affiliations: Association of Small Business Development Centers
Iowa State University
U.S. Small Business Administration
Name: Ronald Manning
Position: State Director
Telephone: (515)292-6351
Fax: (515)292-0020
E-mail: rmanning(5),iastate.edu
Provider: Kansas Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.sbeap.niar.twsu.edu
Affiliations: Kansas Department of Health and Environment
University of Kansas
Name: Frank Orzulak
Position: Director
Telephone: (913) 864-3978
Fax: (913) 864-5827
E-mail: ceet(g)falcon. ku. edu
Name: Toll Free Hotline (State)
Telephone: (800) 578-8898
Provider: Kansas Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: Debbie Bishop
Position: State Director
Telephone: (913)296-6514
Fax: (913)291-3261
E-mail: ksbdc(5),cinetworks.com
Provider: Kentucky Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
A-20
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Appendix A: Technology Transfer Information Sources
Internet URL: www. gatton. gws.ukv.edu/KentuckvBusiness/kbeap
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
University of Kentucky
Name: Janet Holloway
Position: State Director
Telephone: (606)257-7668
Fax: (606)323-1907
E-mail: cbeih@pop.ukv.edu
Provider: Kentucky -University of Kentucky Business Environmental Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: gatton.gws.uky.edu/KentuckyBusiness/kbeap/kbeap.ht
Affiliations: Kentucky Department of Natural Resources and Environmental Protection
University of Kentucky
Name: Greg Copely
Position: Director
Telephone: (606)257-1131
Fax (606)323-1907
E-mail: kbeapfSlpop.ukv. edu
Name: Toll Free Hotline (State)
Telephone: (800) 562-2327
Provider: Louisiana Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.deq.state.la.us/oarp/sbap/sbap.html
Affiliations: Louisiana Department of Environmental Quality (Air)
Name: Toll Free Hotline (State)
Telephone: (800) 259-2890
Name: Vic Tompkins
Position: Director
Telephone: (504) 765-2453
Fax: (504) 765-0921
E-mail: sbap@,deq.state.la.us
Provider: Louisiana Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: leap.nlu.edu/html/lsbdc/index.htm
Affiliations: Association of Small Business Development Centers
Northeast Louisiana University
U. S. Small Business Administration
Name: Dr. John Baker
Position: State Director
Telephone: (318) 342-5506
Fax: (318)342-5510
E-mail: brbaker@,alpha.nlu. edu
Provider: Maine Small Business Assistance Program
Membership: Businesses classified as non-major sources
Notes
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Appendix A: Technology Transfer Information Sources
Notes
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.state.me.us/dep
Affiliations: Maine Department of Environmental Protection, Office of Pollution Prevention
Name: Brian Kavanah
Position: Program Coordinator
Telephone: (207) 287-6188
Fax: (207) 287-7826
E-mail: brian.w.kavanah(5).state.me.us
Provider: Maine Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.usm.maine.edu/~sbdc
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of Southern Maine
Name: Charles Davis
Position: State Director
Telephone: (207) 780-4420
Fax: (207) 780-4810
E-mail: msbdc(g),portland.maine.edu
Provider: Maryland Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.mde.state.md.us/epsc/sbap.html
Affiliations: Maryland Department of the Environment, Air & Radiation Mgt. Admin.
Name: Lorrie Del Pizzo
Position: Project Manager
Telephone: (410)631-6772
Fax: (410)631-4477
Name: Toll Free Hotline (National)
Telephone: (800)433-1247
Provider: Maryland Small Business Development Center Network
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: James Graham
Position: State Director
Telephone: (301) 403-8300
Fax: (301) 403-8303
E-mail: dwirth(g)mbs.umd.edu
Provider: Massachusetts Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Massachusetts Exec. Office of Env. Affairs, Office of Technical Assistance
Name: George Frantz
A-22
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Appendix A: Technology Transfer Information Sources
Position:
Telephone:
Fax:
Program Director
(617) 727-3260
(617) 727-3827
Provider: Massachusetts Small Business Development Center Network
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.umassp.edu/msbdc
Affiliations: Association of Small Business Development Centers
University of Massachusetts- Amherst
Name: John Ciccarelli
Position: State Director
Telephone: (413)545-6301
Fax: (413)545-1273
E-mail: i.ciccarelli(g),dpc.umass.edu
Provider: Michigan Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.deq.state.mi.us/ead/iasect/eac.html
Affiliations: Michigan Department of Natural Resources
Name: Dave Fiedler
Position: Manager, Clean Air Asst. Prog.
Telephone: (517)373-0607
Fax: (517)335-4729
E-mail: eac(g).deq.state.mi.us
Name: Toll Free Hotline (National)
Telephone: (800)662-9278
Provider: Michigan Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: BizServe.com/sbdc
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Wayne State University
Name: Ronald Hall
Position: State Director
Telephone: (313)964-1798
Fax: (313)964-3648
E-mail: ron@misbdc.wayne.edu
Provider: Minnesota Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.pea, state.mn.us/pro grams/sbap_p.html
Affiliations: Minnesota Pollution Control Agency
Name: Barbara Conti
Position: Program Coordinator
Telephone: (612) 297-7709
Notes
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Notes
Appendix A: Technology Transfer Information Sources
Fax: (612) 297-7709
E-mail: barbara.conti(g),pca. state.mn.us
Name: Phyllis Strong
Position: Compliance Asst. Specialist
E-mail: phvllis.strong(g),pca. state, mn.us
Name: Toll Free Hotline (State)
Telephone: (800) 657-3938
Provider: Minnesota Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.d.umn.edu/~iiacobsl/sbdc.html
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: Mary Kruger
Position: State Director
Telephone: (612) 297-5770
Fax: (612)296-1290
E-mail: marv.kruger@,state.mn.us
Provider: Mississippi Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Chemical marketers
Independently owned businesses
Affiliations: Mississippi Department of Environmental Quality
Name: Jesse Thompson
Position: BAP Principal
Telephone: (601) 961-5171
Fax: (601) 961-5742
E-mail: iesse_thompson(g)deq. state.ms.us
Name: Toll Free Hotline (National)
Telephone: (800) 725-6112
Provider: Mississippi Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.olemiss.edu/depts/mssbdc
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: Raleigh Byars
Position: State Director
Telephone: (601) 232-5001
Fax: (601) 232-5650
E-mail: rbvarsfatolemiss.edu
Provider: Missouri Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.missouri.edu/~sbdwww
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
A-24
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
University of Missouri
Name: Max Summers
Position: State Director
Telephone: (573) 882-0344
Fax: (573) 884-4297
E-mail: sbdc-mso(5),ext.missouri.edu
Provider: Missouri Small Business Technical Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. state.mo.us/dnr/deq/tap/hometap.htm
Affiliations: Missouri Department of Natural Resources
Name: Byron Shaw, Jr.
Position: Chief, Business Assistance Unit
Telephone: (573) 526-5352
Fax: (573) 526-5808
Name: Toll Free Hotline (National)
Telephone: (800)361-4827
Provider: Montana Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.deq.mt. gov/pcd/index.htm
Affiliations: Montana Department of Environmental Quality, Air Quality Division
Name: Mark Lambrecht
Position: Project Manager
Telephone: (406) 444-1424
Fax: (406) 406-4441
Name: Toll Free Hotline (National)
Telephone: (800) 433-8773
Provider: Montana Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Ralph Closure
E-mail Acting Director
Telephone: (406) 444-4780
Fax: (406)444-1872
E-mail rclosure@mt. gov
Provider: Nebraska Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Nebraska Department of Environmental Quality
Name: Dan Eddinger
Position: SBAP Principal and Ombudsman
Telephone: (402)471-3413
Fax: (402)471-2909
E-mail: edh@,nccibm. artpnc. eta, gov
Notes
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Appendix A: Technology Transfer Information Sources
Notes
Provider: Nebraska Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.nbdc.unomaha.edu
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of Nebraska at Omaha
Name: Robert Bemier
Position: State Director
Telephone: (402) 554-2521
Fax: (402) 554-3473
E-mail: rbemierfSlcbafacuity. unomaha. edu
Provider: Nevada Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Nevada Department of Environmental Protection
Name: David Cowperthwaite
Position: Small Business Program Manager
Telephone: (702) 687-4670
Fax: (702) 687-5856
Name: Janet Goldman
Position Technical Asst. Coordinator
Telephone: (702)784-3164
Name: Toll Free Hotline (State)
Telephone: (800) 992-0900
Provider: Nevada Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer emp loyees
Independently owned businesses
Internet URL: www.scs.unr.edu/nsbdc
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of Nevada, Reno
Name: Sam Males
Position: State Director
Telephone: (702)784-1717
Fax: (702) 784-4337
E-mail: wmoore@scs.unr.edu
Name: Toll Free Hotline (State)
Telephone: (800) 882-3233
Provider: New Hampshire Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: New Hampshire Department of Environmental Services, Air Resources Division
Name: Rudolph Cartier
Position: Small Business Ombudsman
Telephone: (603)271-1379
Fax: (603)271-1381
A-26
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Appendix A: Technology Transfer Information Sources
E-mail: cartierfSldeS arsb .mv. com
Name: Toll Free Hotline (State)
Telephone: (800) 837-0656
Notes
Provider: New Hampshire Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. ermine. com/sbdc/index.htm
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
University of New Hampshire
Name: Mary Collins
Position: State Director
Telephone: (603) 862-2200
Fax: (603) 862-4876
E-mail: LM1 @,christa.unh. edu
Provider: New Jersey Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.state.ni .us/dep
Affiliations: New Jersey Dept. of Environmental Protection, Office of Permit Information
Name: Chuck McCarty
Position: Director
Telephone: (609)292-3600
Fax: (609)777-1330
Provider: New Jersey Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.nj.com/nisbdc
Affiliations: Association of Small Business Development Centers
Rutgers University
Name: Brenda Hopper
Position: State Director
Telephone: (973) 353-5950
Fax: (973)353-1110
E-mail: bhopper@,andromeda.rutgers.edu
Provider: New Mexico Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: New Mexico Environmental Department, Air Quality Bureau
Name: Lany Weaver
Position: Program Manager
Telephone: (505) 827-0042
Fax: (505) 827-0045
Name: Toll Free Hotline (National)
Telephone: (800) 810-7227
Provider:
New Mexico Small Business Development Center
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A-27
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Appendix A: Technology Transfer Information Sources
Notes
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
Santa Fe Community College
Name: J. Roy Miller
Position: State Director
Telephone: (505) 438-1362
Fax: (505)471-9469
E-mail: rmiller(g).santa-fe.cc.nm.us
Provider: New York Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: New York State Environmental Facilities Corporation
Name: Marian Mudar
Position: Environmental Program Manager
Telephone: (518)457-9135
Fax: (518)485-8494
E-mail: mudar(5)nv efc.org
Name: Toll Free Hotline (State)
Telephone: (800) 780-7227
Provider: New York Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
Name: James King
Position: State Director
Telephone: (518)443-5398
Fax: (518)465-4992
E-mail: kingjlfSlsvsadm. sunv.edu
Provider: North Carolina Small Business and Technical Center
Membership: Businesses classfied as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.sbtdc.org
Affiliations: Association of Small Business Development Centers
Name: Scott Daugherty
Position: Executive Director
Telephone: (919)715-7272
Fax: 919)715-7777
E-mail: srdaughe. sbdc(5).mhs. unc.edu
Provider: North Carolina Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: North Carolina Department of Health and Natural Resources
Name: Fin Johnson
Position: Program Manager
Telephone: (919)733-0824
A-28
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Appendix A: Technology Transfer Information Sources
Fax:
(919)715-6794
Notes
Provider: North Dakota Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.ehs.health.state.nd.us/ndhd/
Affiliations: North Dakota Department of Health
Name: Jeff Burgess
Position: Environmental Engineer
Name: Toll Free Hotline (State)
Telephone: (800) 755-1625
Name: TomBachman
Position: Manager of Permitting
Telephone: (701)328-5188
Fax (701) 328-5200
E-mail: health(5),pioneer. state. nd. us
Provider: North Dakota Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Walter Kearns
Position: State Director
Telephone: (701)777-3700
Fax (701)777-3225
E-mail: Kearns@prairie.nodak.edu
Provider: Ohio Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.epa.ohio.gov/other/sbao/sbaindex.html
Affiliations: Ohio EPA, Division of Air Pollution
Name: Jim Carney
Position: Program Representative
E-mail: iim.camevfgtoentral.epa.ohio.us
Name: Rick Carleski
Position: Program Supervisor
Telephone: (614) 728-1742
Fax (614) 644-3681
Provider: Ohio Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.soerf.ohiou.edu/~osbdc
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Holly Schick
Position: State Director
Telephone: (614)466-2711
Fax (961)466-0829
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-29
-------
Notes
Appendix A: Technology Transfer Information Sources
E-mail: hschickfSlodod.ohio. gov
Name: Toll Free Hotline (National)
Telephone: (800)848-1300
Name: Toll Free Hotline (State)
Telephone: (800) 248-4040
Provider: Oklahoma Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.deq.oklaosf.state.ok.us.SBAPintr.htm
Affiliations: Oklahoma Department of Environmental Quality
Name: Adrian Simmons
Position: Wood Furniture, Emissions
Name: Alwin Ning
Position: Electroplating & Printing
Telephone: (405)271-1400
Fax (405)271-1317
Name: Judy Duncan
Position: Director, Customer Services Div.
Name: Kyle Arthur
Position: Degreasing, Dry Cleaning, Title V
Name: Toll Free Hotline (State)
Telephone: (800) 869-1400
Provider: Oklahoma Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
Southeastern Oklahoma State
U.S. Small Business Administration
Name: Grade Pennington
Position: State Director
Telephone: (800) 522-6154
Fax (405) 920-7471
E-mail: gpennington@,sosu.edu
Provider: Oregon Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.deq.state.or.us
Affiliations: Oregon Department of Environmental Quality, Air Quality Division
Name: Terry Obteshka
Position: Director
Telephone: (503) 229-6147
Fax (503) 229-5675
E-mail: obteshka.terry @,deq.state.or.us
Name: Toll Free Hotline (State)
Telephone: (800) 452-4011
Provider: Oregon Small Business Development Center Network
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
A-30
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix A: Technology Transfer Information Sources
Independently owned businesses
Affiliations: Association of Small Business Development Centers
Lane Community College
U. S. Small Business Administration
Name: Edward (Sandy) Cutler
Position: State Director
Telephone: (541)726-2250
Fax (541) 345-6006
E-mail: cutlers(5)ianecc.edu
Provider: Pennsylvania Air Help Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. dep. state.pa.us/dep/deputate/pollprev
Affiliations: Pennsylvania Department of Environmental Resources, Bureau of Air Quality
Name: Scott Kepner
Position: Director
Telephone: (717)787-1663
Fax (717)772-2303
E-mail: webmaster(5),al.dep.state.pa.us
Name: Toll Free Hotline (National)
Telephone: (800) 722-4343
Provider: Pennsylvania Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. liberty net. org/pasbdc
Affiliations: Association of Small Business Development Centers
The Wharton School of the University of Pennsylvania
U. S. Small Business Administration
Name: Gregory Higgins
Position: State Director
Telephone: (215)898-1219
Fax (215)573-2135
E-mail: ghiggins(g),wharton.upenn.edu
Provider: Rhode Island Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Rhode Island Department of Environmental Management
Name: Pam Annarummo
Position: Program Supervisor
Name: Richard Enander
Position: Technical Assistance Mangager
Telephone: (401) 277-6822
Fax (401)277-3810
Provider: Rhode Island Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.ri-sbdc.com
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-31
-------
Notes
Appendix A: Technology Transfer Information Sources
Affiliations: Association of Small Business Development Centers
Bryant College
U.S. Small Business Administration
Name: Douglas Jobling
Position: State Director
Telephone: (401)232-6111
Fax (401) 232-6933
Provider: South Carolina Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.state.sc.us/dhec/eqchome.htm
Affiliations: South Carolina Bureau of Air Quality Control
Name: Chad Pollock
Position: Technical Assistance
Telephone: (803) 734-2765
Fax (803) 734-9196
E-mail: pollocrc(g),columb3 0. dhec. state, sc. us
Name: Donna Gulledge
Position: Small Business Ombudsman
Telephone: (803) 734-6487
Fax (803) 734-9196
E-mail: gulleddh@.columb30. dhec.state.se. us
Name: Toll Free Hotline (National)
Telephone: (800) 819-9001
Provider: South Carolina Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: sbdcweb.badm.sc.edu
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of South Carolina
Name: John Lenti
Position: State Director
Telephone: (803) 777-4907
Fax (803) 777-4403
E-mail: Lenti@darla.badm. sc.edu
Provider: South Dakota Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www. state, sd.us/state/executive/denr
Affiliations: South Dakota Department of Environmental and Natural Resources
Name: Bryan Gustafson
Position: Air Permitting
Telephone: (605)773-3351
Fax (605) 773-6035
E-mail: i oen@,denr. state. sd. us
Provider: South Dakota Small Business Development Center
Membership: Businesses classified as non-major sources
A-32
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
University of South Dakota
Name: Robert Ashley, Jr.
Position: State Director
Telephone: (605) 677-5498
Fax (605) 677-5272
E-mail: rashlev@sundance.usd.edu
Provider: Tennessee Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.state.tn.us/environment/permits/handbook
Affiliations: Tennessee Department of the Environment and Conservation
Name: Linda Sadler
Position: Director
Telephone: (615)532-0779
Fax (615)532-0614
Name: Toll Free Hotline (National)
Telephone: (800)734-3619
Provider: Tennessee Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.tsbdc.memphis.edu
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of Memphis
Name: Dr. Kenneth Burns
Position: State Director
Telephone: (901)678-2500
Fax (901) 678-4072
E-mail: gmicklefgjadminl .memphis.edu
Provider: Texas Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.tnrcc.state.tx.us/exec/small_business
Affiliations: Texas Natural Resource Conservation Commission
Name: Kerry Drake
Position: Manager, Technical Asst. Prog.
Telephone: (512)239-1112
Fax (512)239-1055
E-mail: sbap(5),tnrcc. state.tx.us
Name: Toll Free Hotline (National)
Telephone: (800) 447-2827
Provider: Texas- Houston Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Notes
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A-33
-------
Appendix A: Technology Transfer Information Sources
Notes
Independently owned businesses
Internet URL: SmBizSolutions.uh.edu
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
University of Houston
Name: Mike Young
Position: Regional Director
Telephone: (713)752-8444
Fax (713)756-1500
E-mail: MYoung@UH.EDU
Provider: Texas- North Texas Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.dcccd.edu/bip/sbdc.htm
Affiliations: Association of Small Business Development Centers
Dallas County Community College
U.S. Small Business Administration
Name: Elizabeth Klimback
Position: Regional Director
Telephone: (214) 860-5835
Fax (214) 860-5813
E-mail: emk9402@.dcccd. edu
Provider: Texas- Northwest Texas Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: nwtsbdc.ttu.edu
Affiliations: Association of Small Business Development Centers
Texas Tech University
U.S. Small Business Administration
Name: Craig Bean
Position: Regional Director
Telephone: (806) 745-3973
Fax (806) 745-6207
E-mail: odaus@.ttacs. ttu.edu
Provider: Texas- South Texas Border Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.lot49.Tristero.Com/sa/sbdc
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: Robert McKinley
Position: Regional Director
Telephone: (210) 458-2450
Fax (210) 458-2464
E-mail: rmckinlefSlutsadt.utsa.edu
Provider: Utah Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
A-34
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Independently owned businesses
Internet URL: www.deq.state.ut.us
Affiliations: Utah Department of Environmental Quality, Division of Air Quality
Name: Frances Bernards
Position: Program Manager
Telephone: (801) 536-4056
Fax (801) 536-4099
E-mail: fbernard(g).deq. state, ut. us
Name: Toll Free Hotline
Telephone: (800) 270-4440
Provider: Utah Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.slcc.edu/utahsbdc
Affiliations: Association of Small Business Development Centers
Salt Lake Community College
U. S. Small Business Administration
Name: Mike Finnerty
Position: State Director
Telephone: (801) 957-3480
Fax (801) 957-3489
E-mail: finnermi@slcc.edu
Provider: Vermont Small Business Compliance Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Vermont Agency of Natural Resources
Name: Judy Mirro
Position: Director
Telephone: (802)241-3745
Fax (802)241-3273
E-mail: iudvmfSlwaste. man, anr. state, vt. us
Provider: Vermont Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Donald Kelpinski
Position: State Director
Telephone: (802)728-9101
Fax (802) 728-3026
E-mail: dkelp insfSlni ght. vtc .vsc.edu
Name: Peter Crawford
Position: Dir., Environmental Asst. Prog.
E-mail: pcrawforfSlvtc. vsc. edu
Provider: Virginia Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-35
-------
Appendix A: Technology Transfer Information Sources
Notes
Independently owned businesses
Internet URL: www.dba.state.virginia.us
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: Robert Wilbum
Position: State Director
Telephone: (804) 371-8253
Fax (804) 225-3384
E-mail: rwilburn@.dba. state, va. us
Provider:
Membership:
Internet URL:
Affiliations:
Name:
Position:
Telephone:
Fax
E-mail:
Name:
Telephone:
Virginia Small Business Policy and Technical Assistance Program
Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
www.deq.state.va.us/osba/smallbiz.html
Virginia Department of Environmental Quality
Richard Rasmussen
Manager
(804) 698-4394
(804) 698-4510
rgrasmussefSldeq. state, va. us
Toll Free Hotline (State)
i 592-5482
Provider: Washington Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Washington Department of Ecology
Name: L eight on Pratt
Position: Small Business Ombudsman
Telephone: (360)407-7018
Fax (360) 407-6802
Provider: Washington Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.sbdc.wsu.edu
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Washington State University
Name: Carol Riesenberg
Position: State Director
Telephone: (509) 335-1576
Fax (509) 335-0949
E-mail: riesenbel@,wsu.edu
Provider: West Virginia Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: West Virginia Office of Air Quality
Name: Fred Durham
Position: Director
A-36
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Telephone:
Fax
E-mail:
Name:
Telephone:
(304) 558-1217
(304) 558-1222
durhaf@mail.wvnet.edu
Toll Free Hotline (State)
(800) 982-2474
Notes
Provider: West Virginia Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.wvdo.org/sbdc
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Hazel Kroesser-Palmer
Position: State Director
Telephone: (304) 558-2960
Fax (304) 558-0127
E-mail: palmeh(g)mail. wvnet. edu
Provider: Wisconsin Clean Air Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: badger, state.wi.us/agencies/commerce
Affiliations: U.S. Small Business Administration
University of Wisconsin
Wisconsin Department of Commerce
Name: Cliff Fleener
Position: Clean Air Specialist
E-mail: cfleenerfSttnail. state, wi. us
Name: Pam Christenson
Position: Technical Assistance Director
Telephone: (608) 267-9214
Fax (608) 267-0436
E-mail: pchristefSlmail. state, wi. us
Provider: Wisconsin Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U. S. Small Business Administration
Name: Erica Mclntire
Position: State Director
Telephone: (608) 263-7794
Fax (608) 263-7830
E-mail: mcintire@,admin.uwex.edu
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-37
-------
Appendix A: Technology Transfer Information Sources
Notes
Provider: Wyoming Small Business Assistance Program
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Internet URL: www.deq.state.wv.us/ms/outweb.htm
Affiliations: Wyoming Department of Environmental Quality, Division of Air Quality
Name: Charles Raffelson
Position: Program Coordinator
Telephone: (307) 777-7391
Fax (307) 777-5616
E-mail: dclark(5).missc. state, wv. us
Provider: Wyoming Small Business Development Center
Membership: Businesses classified as non-major sources
Businesses with 100 or fewer employees
Independently owned businesses
Affiliations: Association of Small Business Development Centers
U.S. Small Business Administration
Name: Diane Wolverton
Position: State Director
Telephone: (307) 766-3505
Fax (307) 766-3406
NON-PROFIT - NATIONAL
Provider:
Membership:
Internet URL:
Affiliations:
Name:
Position:
Telephone:
Fax
E-mail:
Center for Emissions Control
Chlorinated solvent producers
www.cec-dc.org
Chlorine Institute
Stephen Risotto
Executive Director
(202) 785-4374
(202) 833-0381
srisotto(5),cec-dc.org
Provider: Research Triangle Institute
Membership: Researchers
Internet URL: www.rti. org/gen_info.html
Affiliations: Duke University
North Carolina State University
University of North Carolina at Chapel Hill
Name: Jesse Baskir, Ph.D.
Position: Director
Telephone: (919) 541-5882
Fax (919) 541-7155
E-mail: ibaskir@rti.org
NON-PROFIT - STATE
Provider: Louisiana Chemical Association
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Internet URL: www.Idol.state.la.us/career/rl/lca_memb.htm
Affiliations: Chemical Manufacturers Association
A-38
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix A: Technology Transfer Information Sources
Federation of State Chemical Associations
Louisiana Chemical Industry Association
Name: Dan Borne
Position: President
Telephone: (504) 344-2609
Fax (504) 344-1007
Name: Henry T. Graham, Jr.
Position: Director, Environ. & Legal Affairs
Notes
Provider: Louisiana Chemical Industry Alliance
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Contractors
Raw materials suppliers
Vendors
Affiliations: Louisiana Chemical Association
Name: Dan Borne
Position: President
Telephone: (504) 344-2609
Fax (504) 344-1007
E-mail: danfgUca.org
Name: Phillip Bowen
Position: Vice President
E-mail: phillip(5).lca.org
Provider: Minnesota Chemical Technology Alliance
Membership: Chemical distributors
Chemical engineers
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Joel Carlson
Position: Director
Telephone: (612) 926-5428
Fax (612) 332-2089
Provider: Plastics Processors Association of Ohio
Membership: Plastics processors
Rubber product manufacturers
Internet URL: www.polysort.com
Affiliations: Society of the Plastics Industry, Inc.
Name: Chris Chrisman
Position: Executive Director
Telephone: (800) 326-8666
Fax (330)665-5152
E-mail: ppaohio@,polv sort, com
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-39
-------
Appendix A: Technology Transfer Information Sources
Notes
PRIVATE COMPANY - INTERNATIONAL
Provider: Alliance for Responsible Atmospheric Policy
Membership: CFCs, HCFCs & HFCs prod. Mfg.
Producers of CFCs, HCFCs, and HFCs
Name: David Stirpe
Position: Legislative Council
Telephone: (703) 243-0344
Fax (703) 243-2874
PROFESSIONAL ASSOCIATION - INTERNATIONAL
Provider: American Association of Textile Chemists and Colorists
Membership: Textile chemists
Textile colorists
Internet URL: www.aatcc.org
Name: Jerry Tew
Position: Technical Director
Telephone: (919) 549-8141
Fax (919) 549-8933
Provider: American Oil Chemists Society
Membership: Fats, oils, & related materials chemists
Fats, oils, & related materials manufacturers
Internet URL: www.aocs.org
Name: James C. Lyon
Position: Executive Director
Telephone: (217) 359-2344
Fax (217) 351-8091
E-mail: general @.aocs. org
Provider: Center for Waste Reduction Technologies
Membership: Chemical manufacturers
Contractors
Downstream manufacturing industries
Petroleum products manufacturers
Pharmaceutical manufacturers
Raw materials suppliers
Internet URL: 198.6.4.175/docs/cwrt.index.htm
Affiliations: American Institute of Chemical Engineers
Name: Jack Weaver
Position: Director
Telephone: (212) 705-7424
Fax (212) 838-8274
E-mail: cwrt(5),aiche.org
Provider: Electrochemcial Society
Membership: Electrochemical engineers
Electrochemical facilities
Electrochemical scientists
Internet URL: www. electrochem. org
Affiliations: American Association for the Advancement of Science
Chemical Heritage Foundation
Federation of Materials Sciences
Name: V.H. Brannecky
A-40
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Position:
Telephone:
Fax
E-mail:
Executive Secretary
(609)737-1902
(609) 737-2743
ecs@.electrochem.org
Notes
Provider: Technical Association of the Pulp and Paper Industry
Membership: Pulp and paper industry professionals
Pulp and paper manufacturers
Pulp and paper processors
Pulp-derived chemical products manufacturers
Internet URL: www.tappi.org
Affiliations: American Forest and Paper Association
National Council for Air and Stream Improvement
Paper Industry Management Association
Name: Wayne Gross
Position: Executive Director
Telephone: (770) 209-7233
Fax (770)446-6947
PROFESSIONAL ASSOCIATION - NATIONAL
Provider:
Membership:
Internet URL:
Name:
Position:
Telephone:
Fax
American Chemical Society
Chemical engineers
Chemists
www.acs.org
John K. Cram
Executive Director
(202) 872-8724
(202) 872-6206
Provider: American Institute of Chemical Engineers
Membership: Chemical engineers
Internet URL: www.aiche.org
Affiliations: Center for Chemical Process Safety
Center for Waste Reduction Technologies
Design Institute for Emergency Relief Systems
Design Institute for Physical Property Data
Name: Sean Devlin Bersell
Position: Director, Government Relations
Telephone: (202) 962-8690
Fax (202) 962-8699
Provider: Federation of Societies for Coatings Technology
Membership: Chemical coatings manufacturers
Chemical coatings users
Internet URL: www.coatingstech.org
Affiliations: National Paint and Coatings Association
Name: Robert F. Ziegler
Position: Executive Vice President
Telephone: (610) 940-0777
Fax (610) 940-0292
Provider: Society of Cosmetic Chemists
Membership: Chemists
Name: Theresa Cesario
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-41
-------
Appendix A: Technology Transfer Information Sources
Notes
Position: Business Administrator
Telephone: (212)668-1500
Fax (212)668-1504
E-mail: societvcoschemfSlworldnet. att.net
PROFESSIONAL ASSOCIATION - STATE
Provider: Alabama Chemical Association
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Kelli Heartsill
Position: Executive Director
Telephone: (334) 265-2154
Fax (334) 834-6398
TRADE ASSOCIATION - INTERNATIONAL
Provider: Adhesives and Sealants Council
Membership: Adhesives manufacturers
Consultants
Equipment manufacturers
Sealant manufacturers
Internet URL: www. ascouncil.org
Name: Mark Collate
Position: Director of Government Relations
Telephone: (202) 452-1500
Fax (202)452-1501
Provider: Chlorine Institute
Membership: Chlor-alkali chemical distributors
Chlor-alkali chemicals manufacturers
Chlor-alkali chemicals marketers
Internet URL: www.cl2.com
Affiliations: Center for Emissions Control
Chemical Manufacturers Association
Halogenated Solvents Industry Alliance
Name: Arthur Duncan
Position: VP Health, Safety, & Environment
Name: Dr. Robert Smerko
Position: President
Telephone: (202) 775-2790
Fax (202) 223-7225
Provider: International Institute of Synthetic Rubber Products
Membership: Synthetic Rubber Producers
Name: R.J. Killian
Position: Managing Director
Telephone: (713)783-7511
Fax (713)783-7253
E-mail: iisrp@.attmail. com
A-42
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Appendix A: Technology Transfer Information Sources
Provider: Pulp Chemicals Association
Membership: Pulp-derived chemical product manufacturers
Name: Jennie Lazarus
Position: PCA Coordinator
Telephone: (770) 209-7237
E-mail: ilazarus(g),tappi.org
Name: Matthew Coleman
Position: Executive Director
Telephone: (770) 446-1290
Fax (770) 446-1487
Provider: Suppliers of Advanced Composite Materials Association
Membership: Advanced composite materials suppliers
Affiliations: Suppliers of Advanced Materials Processing Engineers
Name: Lynne Justice
Position: Director of Administration
Telephone: (703)841-1556
Fax (703) 812-8743
E-mail: iaistaff(Slworldnet. att.net
TRADE ASSOCIATION - NATIONAL
Provider:
Membership:
Internet URL:
Name:
Position:
Telephone:
Fax
Adhesives Manufacturers Association
Adhesives manufacturers
Raw materials suppliers
www.adhesive.org/ama
Frank Moore
Director, Government Relations
(202)857-1127
(202)857-1115
Notes
Provider: Alliance of Chemical Industries of New York State, Inc.
Membership: Chemical manufacturers
Service providers to the Chemical Industry
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Diana Hinchcliff
Position: Executive Director
Telephone: (518)427-7861
Fax (518)427-7008
Provider: American Crop Protection Association
Membership: Agricultural crop protection distributors
Agricultural crop protection formulators
Agricultural crop protection manufacturers
Pest control product distributors
Pest control product formulators
Pest control product manufacturers
Internet URL: www.acpa.org
Name: Ray McAllister
Position: Director, Regulatory Affairs
Telephone: (202)296-1585
Fax (202) 463-0474
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-43
-------
Appendix A: Technology Transfer Information Sources
Notes
Provider: American Fiber Manufacturers Association
Membership: Fibers, filaments, and yarns manufacturers
Internet URL: www.fibersource.com(under construction)
Affiliations: Fiber Economics Bureau
Name: Dr. Robert Barker
Position: Vice President
Telephone: (202) 296-6508
Fax (202) 296-3052
E-mail: inks@afma.org
Name: Jeff Inks
Provider: American Petroleum Institute
Membership: Petroleum product manufacturers
Petroleum products users
Internet URL: www.api.org
Name: Joe Lastelic
Position: Senior Media Relations Rep
Telephone: (202) 682-8000
Fax (202) 682-8096
E-mail: prfSlapi.org
Provider: Biotechnology Industry Organization
Membership: Biotechnology companies
State biotechnology centers
Internet URL: www.bio.org
Affiliations: Arkansas Biotechnology Association and Biomedical Technology Center
Bay Area Bioscience Center
BIO+Flonda
BIOCOM/San Diego
Biotechnology Association of Maine
Biotechnology Council of New Jersey
California Healthcare Institute
Colorado Biotechnology Association
Connecticut United For Research Excellence
Edison Biotechnology Center
Georgia Biomedical Partnership
Illinois Alliance for Biotechnology
Iowa Biotechnology Association
Los Alamos National Lab
Maryland Bioscience Alliance
Massachusetts Biotechnology Council
Michigan Biotechnology Association
Minnesota Biotechnology Association
New York Biotechnology Association
North Carolina Bioscience Organization
Oregon Bioscience Association
Pennsylvania Biotechnology Association
South Dakota Biotechnology Association
Texas Healthcare and Bioscience Institute
Utah Life Science Industries Association
Virginia Biotechnology Association
Washington Biotechnology & Biomedical Association
Wisconsin Biotechnology Association
Name: Richard G. Godown
Position: President
Telephone: (202) 857-0244
A-44
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix A: Technology Transfer Information Sources
Fax
E-mail:
(202) 857-0237
infofSlbio.org
Notes
Provider: Chemical Coalers Association International
Membership: Chemical coatings manufacturers
Chemical coatings users
Internet URL: www.finishing.com/CCAI/index.html
Name: Anne Goyer
Position: Executive Director
Telephone: (513) 624-6767
Fax (513)624-0601
E-mail: avgover@mci2000.com
Provider: Chemical Industry Council of Maryland
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Roy Vaillant
Position: Managing Director
Telephone: (410)974-4071
Fax (410)974-4071
Provider: Chemical Manufacturers Association
Membership: Chemical manufacturers
Internet URL: www. cmahq. com
Affiliations: Alabama Chemical Association
Alliance of Chemical Industries of New York State, Inc.
Association of Water Technologies
Chemical Council of Missouri
Chemical Industry Committee, Tennessee Association of Business
Chemical Industry Committee, WV Manufacturers Association
Chemical Industry Council of Associated Industries of Kentucky
Chemical Industry Council of California
Chemical Industry Council of Delaware
Chemical Industry Council of Illinois
Chemical Industry Council of Maryland
Chemical Industry Council of New Jersey
Chlorine Institute, The
Compressed Gas Association, Inc.
East Harris County Manufacturers Association
Federation of State Chemical Associations
Florida Chemical Industry Council
Louisiana Chemical Association
Manufacturers and Chemical Industry Council of North Carolina
Massachusetts Chemical Technology Alliance
Michigan Chemical Council
Minnesota Chemical Technology Alliance
Ohio Chemical Council
Pennsylvania Chemical Industry Council
Plus most of the Federation of State Chemical Associations
Responsible Care Partnership Program Partner Associations
Synthetic Organic Chemical Manufacturers Association
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-45
-------
Appendix A: Technology Transfer Information Sources
Notes
Texas Chemical Council
Vinyl Institute
Name: Joe Mayhew
Position: Asst. VP, Environment & Policy
Telephone: (703)741-5000
Fax (703)741-6000
Provider: Chemical Producers and Distributors Association
Membership: Chemical distributors
Chemical manufacturers
Name: Warren Stickle
Position: President
Telephone: (703) 548-7700
Fax (703)548-3149
E-mail: cpdafSdx. netcom.com
Provider: Chemical Specialties Manufacturers Association
Membership: Chemical manufacturers
Internet URL: www.csma.org
Name: Philip Klein
Position: Director, Fed. Legislative Affairs
Telephone: (202)872-8110
Fax (202)872-8114
E-mail: csmafSli uno.com
Provider: Chlorine Chemistry Council
Membership: Chlorine producers
Internet URL: www.c3.org
Affiliations: Chemical Manufacturers Association
Name: Clifford Howlett
Position: Executive Director
Telephone: (703)741-5000
Fax (703)741-6084
E-mail: info(g).c3.org
Provider: Color Pigments Manufacturers Association, Inc.
Membership: Color pigment manufacturers
Name: Doug Nelson
Position: Research and Regulatory Affairs
Telephone: (703) 684-4044
Fax (703)684-1795
Provider: Composite Fabricators Association
Membership: Composite distributors
Composite manufacturers
Composite suppliers
Composite users
Consultants
Educators
Retirees
Internet URL: www.cfa-hq.org
Name: Robert Lacovara
Position: Director, Technical Services
Name: Steve McNally
Position: Director, Government Affairs
A-46
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Telephone:
Fax
E-mail:
(703)525-0511
(703)525-0515
cfa@,cfa -hq.org
Notes
Provider: Cosmetic, Toiletry, and Fragrance Association
Membership: Personal care product distributors
Personal care product manufacturers
Raw materials suppliers
Internet URL: www.ctfa.org
Affiliations: Cosmetic Ingredient Review
Name: Joyce Graff
Position: Manager, Environmental Affairs
Telephone: (202)331-1770
Fax (202)331-1969
Provider: Fertilizer Institute
Membership: Consultants
Fertilizer distributors
Fertilizer manufacturers
Raw materials suppliers
Name: Jim Skillen
Position: Dir, Envir. & Energy Programs
Telephone: (202) 675-8250
Fax (202) 544-8123
Provider: Fire Retardant Chemical Association
Membership: Fire retardant materials producers
Fire retardant materials users
Name: Russel C. Kidder
Position: Executive Vice President
Telephone: (717)291-5616
Fax (717)295-9637
Provider: Foodservice and Packaging Institute, Inc.
Membership: Disposable foodservice product distributors
Disposable foodservice products manufacturers.
Equipment manufacturers
Raw materials suppliers
Internet URL: www.fpi.org
Name: Ann Mattheis
Position: Director, Public Affairs
Name: Richard B. Norment
Position: President
Telephone: (703) 527-7505
Fax (703)527-7512
E-mail: fooserv@.crosslink.net
Provider: International Fabricare Institute
Membership: Dry Cleaners
Launderers
Internet URL: www.ifi.org
Name: Jim Patrie
Position: President
Telephone: (301)622-1900
Fax (301) 236-9320
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-47
-------
Notes
Appendix A: Technology Transfer Information Sources
E-mail: communications(5),ifi.org
Name: Toll Free Hotline (National)
Telephone: (800) 638-2627
Provider: International Slurry Surfacing Association
Membership: Asphalt slurry seal companies
Professionals involved in asphalt slurry seal
Internet URL: www.historv.rochester.edu/issa
Affiliations: Foundation for Pavement Rehabilitation and Maintenance Research
Name: John Fiegel
Position: Executive Officer
Telephone: (202) 857-1160
Fax (202)857-1111
E-mail: issa@spa.com
Provider: Metal Finishing Suppliers Association
Membership: Metal finishing materials suppliers
Internet URL: www.metal-finishing.com/mfsa.htm
Name: Dr. Rebecca Spearot
Position: Environmental Affairs Chair
Name: Ken Hankinso
Position: Environmental Affairs Vice Chair
Name: Richard W. Grain
Position: Executive Director
Telephone: (630) 887-0797
Fax (630) 887-0799
Provider: National Association of Chemical Distributors
Membership: Chemical distributors
Internet URL: www.nacd.com
Affiliations: National Association of Chemical Distributors Education Foundation
Name: Geoffrey O'Hara
Position: Director, Government Affairs
Name: William Allmond
Position: Director, Regulatory Affairs
Telephone: (703) 527-6223
Fax (703) 527-7747
Provider: National Association of Chemical Distributors Education Foundation
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Chemical users
Internet URL: www.nacd.com/NACDEF
Affiliations: National Association of Chemical Distributors
Name: Lisa Capone
Position: Program Manager
Telephone: (703) 527-6223
Fax (703) 527-7747
Provider: National Association of Chemical Recyclers
Membership: Chemical recyclers
Internet URL: www.bismarck.com/nacr/nacr.html
Affiliations: Cement Kiln Recycling Coalition
A-48
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Name: H. Peter Nerger
Position: President
Telephone: (202) 296-1725
Fax (202)296-2530
E-mail: 103612,514(5),compuserve.com
Provider: National Association of Printing Ink Manufacturers, Inc.
Membership: Printing ink manufacturers
Internet URL: www.napim. or g/napim
Affiliations: National Printing Ink Research Institute
Name: George Fuchs
Position: Environmental Manager
Telephone: (201) 288-9454
Fax (201)288-9453
E-mail: napim(g)napim. org
Provider: National Paint and Coatings Association
Membership: Chemical coatings manufacturers
Chemical coatings users
Paint distributors
Paint manufacturers
Paint users
Raw materials suppliers
Internet URL: www.paint.org
Name: J. Andrew Doyle
Position: Executive Director
Telephone: (202) 462-6272
Fax (202)462-8549
E-mail: npca(g).paint.org
Name: Sony a McDavid
Position: Asst. Dir. Environmental Affairs
Name: Stephen R. Sides
Position: Director, Health, Safety, & Env.
Provider: National Pest Control Association
Membership: Pesticides applicators
Internet URL: www.pestworld.com
Name: Bob Rosenberg
Position: Director of Government Affairs
E-mail: Bob_Rosenberg(g),msn.com
Name: Gene Harrington
Position: Manager of Government Affairs
E-mail: Harrington(g).pestworld. org
Name: Rob Lederee
Position: CEO & Executive Vice President
Telephone: (703) 573-8330
Fax (703)573-4116
E-mail: L ederer (Slpestworld .org
Provider: Pharmaceutical Research and Manufacturers of America
Membership: Research-based pharmaceutical operations
Internet URL: www.phmia.org
Affiliations: Pharmaceutical Research and Manufacturers of America Foundation
Name: Thomas White
Position: Associate Vice President
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-49
-------
Appendix A: Technology Transfer Information Sources
Notes
Telephone:
Fax
(202) 835-3546
(202) 835-3597
Provider: Polyisocyanurate Insulation Manufacturers Association
Membership: Polyiso insulation manufacturers
Raw materials suppliers
Name: Rebecca Loyd
Position: Secretary
Telephone: (202) 624-2709
Fax (202) 628-3856
E-mail: pima(5),buildernet.com
Provider: Powder Coatings Institute
Membership: Powder coating equipment suppliers
Powder coating facilities
Powder coating materials manufacturers
Powder coating materials marketers
Resin manufacturers
Internet URL: www.powdercoating.org
Name: Greg Bocchi
Position: Executive Director
Telephone: (703)684-1770
Fax (703)684-1771
E-mail: pci-infofSlpowdercoating. ore
Provider: Rubber Manufacturers Association
Membership: Rubber product manufacturers
Tire manufacturers
Internet URL: www.rma.org
Affiliations: Scrap Tire Management Council
Tire Industry Safety Council
Name: Kristen Udowitz
Position: Communications and Marketing
Telephone: (202) 682-4800
Fax (202) 783-3512
E-mail: kristenfSltmn.com
Provider: Society of the Plastics Industry, Inc.
Membership: Plastics mold makers
Plastics processors
Raw materials suppliers
Internet URL: www.socplas.org
Name: Pat Toner
Position: Technical Vice President
Telephone: (202) 974-5200
Fax (202) 296-7005
E-mail: feedback@socplas.org
Name: Tom Southall
Position: Information Manager
Provider: Synthetic Organic Chemical Manufacturers Association
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Service providers to the Chemical Industry
A-50
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix A: Technology Transfer Information Sources
Internet URL: www.socma.com
Name: Cheryl O. Morton
Position: Director, Technical Affairs
Name: Gray don Powers
Position: President
Name: Mary J. Legatski
Position: Director, Government Relations
Name: Robert Grasso
Position: Vice President of Govt Affairs
Telephone: (202)296-8577
Fax (202) 296-8120
Name: Sherry L. Edwards
Position: Director, Public Policy
Notes
Provider: Vinyl Institute
Membership: Vinyl additives & modifiers manufacturers
Vinyl chloride monomer manufacturers
Vinyl manufacturers
Vinyl packaging manufacturers
Internet URL: www.vinvlinfo.org
Affiliations: Society of the Plastics Industry, Inc.
Vinyl Environmental Resource Center
Name: Robert H. Burnett
Position: Executive Director
Telephone: (973) 898-6699
Fax (973) 898-6633
E-mail: vi@socplas.org
TRADE ASSOCIATION - STATE
Provider: Chemical Council of Missouri
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Sandra Bennett
Position: Executive Administrator
Telephone: (573) 636-2822
Fax (573)636-8749
Provider: Chemical Industry Committee, Tennessee Association of Business
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Internet URL: www.tennbiz.org
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Dave Goetz
Position: Executive Director, CIC
Telephone: (615) 256-5141
Fax (615)256-6726
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-51
-------
Appendix A: Technology Transfer Information Sources
Notes
E-mail:
infofSltennbiz. ore
Provider: Chemical Industry Committee, WV Manufacturers Association
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Karen Price
Position: President
Telephone: (304) 342-2123
Fax (304) 342-4552
E-mail: wvmafg) city net. net
Provider: Chemical Industry Council of Associated Industries of Kentucky
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Internet URL: www.aik.org
Affiliations: Associated Industries of Kentucky
Chemical Manufacturers Association
Federation of State Chemical Associations
Name: John Nickols
Position: Executive Vice President
Telephone: (502)491-4737
Fax (502)491-5322
Provider: Chemical Industry Council of California
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Paul Kronenberg
Position: Executive Director
Telephone: (916)442-1420
Fax (916) 442-3387
Provider: Chemical Industry Council of Delaware
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: William Wood
Position: Executive Director
Telephone: (302) 655-2673
Fax (302) 655-2673
Provider:
Chemical Industry Council of Illinois
A-52
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Jack Toslosky
Position: Executive Director
Telephone: (847) 823-4020
Fax (847) 823-4033
Notes
Provider: Chemical Industry Council of New Jersey
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Internet URL: www.cicnj.org
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Hal Bozarth
Position: Executive Director
Telephone: (609) 392-4214
Fax (609) 392-4816
Provider: Chemical Industry Council of North Carolina
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: George Everett
Position: Executive Director
Telephone: (919)834-9459
Fax (919)833-1926
E-mail: gtenccic(5),aol. com
Provider: Florida Manufacturing and Chemical Council
Membership: Chemical distributors
Chemical manufacturers
Internet URL: www.fmcc.org
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Nancy D. Stephens
Position: Executive Director
Telephone: (904) 224-8141
Fax (904) 224-5283
E-mail: fmccfSlintemetmci.com
Provider: Massachusetts Chemical Technology Alliance
Membership: Chemical distributors
Chemical engineering firms
Chemical manufacturers
Chemical marketers
Chemical recyclers
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-53
-------
Notes
Appendix A: Technology Transfer Information Sources
Chemical users
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Michael DeVito
Position: Executive Director
Telephone: (617)451-6282
Fax (617) 695-9568
Provider: Michigan Chemical Council
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Andrew Such
Position: Executive Director
Telephone: (517) 372-8898
Fax (517) 372-9020
Provider: Ohio Chemical Council
Membership: Chemical distributors
Chemical manufacturers
Chemical marketers
Chemical recyclers
Internet URL: www. ohiochem. ore
Affiliations: Chemical Manufacturers Association
Name: Peggy Smith
Position: Secretary/Executive Director
Telephone: (614)224-1730
Fax (614)224-5168
E-mail: ohchem@infinet. com
Provider: Pennsylvania Chemical Industry Council
Membership: Chemical engineers
Chemical manufacturers
Chemical marketers
Chemical recyclers
Internet URL: www.pcic.org/home.html
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: David W. Patti
Position: Executive Director
Telephone: (717) 232-6681
Fax (717) 232-4684
E-mail: infofg).pcic.org
Name: Juli Conrad
Position: Staff Assistant, Govt. Affairs
Name: Matthew Tunnell
Position: Government Affairs Coordinator
Provider:
Membership:
Texas Chemical Council
Chemical distributors
Chemical manufacturers
Chemical marketers
A-54
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Technology Transfer Information Sources
Chemical recyclers
Internet URL: www.txchemcouncil. ore
Affiliations: Chemical Manufacturers Association
Federation of State Chemical Associations
Name: Jim Woodrick
Position: President
Telephone: (512)477-4465
Fax (512)477-5387
E-mail: kncard(g)inail.eden.com
UNIVERSITY - NATIONAL
Provider: Center for Clean Products and Clean Technologies at the University of Tennessee
Membership: Academic researchers
Internet URL: www.ra.utk.edu/eerc/clean2.html
Affiliations: University of Tennesee - Knoxville
University of Tennessee Energy, Environment, and Resources Center
Name: Gary A. Davis
Position: Director
Telephone: (423)974-4251
Fax (423)974-1838
E-mail: davisgfSleerc. gw.utk.edu
Provider: Center for Clean Technology at UCLA
Membership: Academic researchers
Internet URL: www.cct.seas.ucla.edu
Affiliations: University of California- Los Angeles
Name: Dr. Selim Senkan
Position: Director
Telephone: (310)206-3071
E-mail: cct@seas.ucla.edu
Provider: Hazardous Substance Research Center South & Southwest
Membership: Academic researchers
Internet URL: www.eng.lsu.edu/center/hsrc.html
Affiliations: Georgia Institute of Technology
Louisiana State University
Rice University
U.S. Environmental Protection Agency
Name: Danny D. Reible
Position: Director
Telephone: (504) 388-6770
Fax (504) 388-5043
E-mail: cmreibfSllsuvm sncc.lsu.edu
Provider: Indiana Pollution Prevention and Safe Materials Institute
Membership: Academic researchers
Internet URL: www. ecn.purdue.edu/IPPI/
Affiliations: Purdue University
Name: Lynn A. Corson Ph.D.
Position: Director
Telephone: (317) 494-6450
Fax (317)494-6422
E-mail: corsonlfSlecn. purdue.edu
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
A-55
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Appendix A: Technology Transfer Information Sources
Notes
Provider: University of Louisville, Kentucky Pollution Prevention Center
Membership: Academic researchers
Business and industry
Internet URL: www.kppc.org
Affiliations: University of Louisville
Name: Cam Metcalf
Position: Executive Director
Telephone: (502) 852-0965
Fax (502) 852-0964
E-mail: icmetcO 1 @athena.louisville.edu
Provider: Massachusetts Institute of Technology Environmental Technology and Public Policy
Program
Membership: Academic researchers
Internet URL: web.mit.edu/dusp/etpp/index-t.html
Affiliations: Massachusetts Institute of Technology
Name: David Laws
Position: Program Administrator
Name: Lawrence Susskind
Position: Co-Principal Investigator
Telephone: (617) 256-5724
Fax (617) 253-7402
E-mail: etp@mit.edu
Name: Vicki Norberg-Bohm
Position: Co-Principal Investigator
Provider: Massachusetts Institute of Technology Program in Technology, Business, and the
Environment
Membership: Academic researchers
Internet URL: web.mit.edu/ctpid/www/tbe/overview.html
Affiliations: Massachusetts Institute of Technology
Name: Dr. John Ehrenfeld
Position: Director
Telephone: (617) 253-5724
Fax (617) 253-7402
E-mail: Jehren@mit.edu
UNIVERSITY - STATE
Provider: University of Tennessee Waste Management Research and Education Institute
Membership: Academic researchers
Internet URL: www.ra.utk.edu/eerc/wmrei2.html
Affiliations: University of Tennessee
Name: Dr. Gary Sayler
Position: Acting Director
Telephone: (423) 974-4251
Fax (423) 974-1838
E-mail: savler@utk.edu
A-56
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix A: Energy Conservation and Pollution Prevention Websites
POLLUTION PREVENTION WEBSITES
Department of Energy (DOE) Energy Efficiency and Renewable Energy Network
http://www.eren.doe.gov/
- The DOE Energy Efficiency and Renewable Energy Network offers resources and archives about energy
conservation techniques and developments.
Department of Energy (DOE) EPIC Home Page P2 Information Clearinghouse
http: //epic. er. doe. gov/epic
- The DOE EPIC home page provides a database search of DOE documents, P2 Regulations, Internet search
engines, a P2 Calendar, P2 software, environmental information sources, material exchange, material
substitution and recycling information.
Department of Energy (DOE) Office of Industrial Technologies (OFT)
http://www.oit.doe.gov/
- The DOE OIT creates partnerships among industry, trade groups, government agencies, and other
organizations to research, develop, and deliver advanced energy efficiency, renewable energy, and pollution
prevention technologies for industrial customers.
Defense Environmental Network & Information Exchange (DENTX)
http://denix.cecer.army.mil/
- DENIX provides the general public with timely access to environmental legislative, compliance, restoration,
cleanup, safely & occupational health, security, and DoD guidance information. Information on DENIX is
updated daily and can be accessed through the series of menus listed below, the site map, or via the DENIX
full-text search engine
Energy and Environment - Division of Lawrence Berkeley Laboratory
http://www.lbl.gov/LBL-Programs/
- Berkeley Lab is a pioneer in energy efficient technologies. Among its many contributions are energy saving
"superwindows," solid-state ballasts for fluorescent lights, rechargeable electric batteries, and aerogels. In
1993, two out of the three major energy research awards from the U.S. Department of Energy went to
Berkeley Lab scientists.
Enviro$en$e Home Page
http://es.epa.gov/index.html
- The most comprehensive environmental website. Provides search services, industry sector notebooks, links
to DOE, EPA, DOD, Federal, Regional and State Agencies, Academia, public interest groups, industry and
trade associations, international resources, vendor information, material exchange and substitution libraries,
P2 information exchange programs and other valuable P2 resources. Information is constantly updated. An
information brochure is available through the Pollution Prevention Clearinghouse (Voice Number 202/260-
1023). PPIC order number A103.
Enviro$en$e - American Institute for Pollution Prevention Home Page
http ://es.epa. gov/aipp/
- The AIPP promotes P2 within industry and throughout society, in part by working through its member
organizations. The website provides general P2 information, AIPP meetings, membership organizations, P2
resource materials, P2 publications and P2 project updates.
EPA Home Page
http: //www. ep a. go v/
- This website provides access to a large amount of information. Users may search for environmentally
related information, public information centers, grants and financing, press releases, software, databases and
newsletters regarding EPA's policies, regulations and assistance programs. Provides information on EPA's
information holdings including documents, TRI, RCRA and other environmental data.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-57
Notes
-------
Appendix A: Energy Conservation and Pollution Prevention Websites
Notes
EPA Region 3 Home Page
http://www.epa.gov/region3/
- This website provides access to information regarding EPA Region 3 offices, programs, staff, and
announcements.
EPA Atmospheric Pollution Prevention Division
http: //www. epa. gov/appd. html
- This site provides information on the activities of EPA's Atmospheric P2 Division. Information on the
Energy Star Program, Green Lights Program, Methane Outreach Program, publications, and software tools
are also located at this website.
Global Environmental Network for Info Exchange (GENIE)
http://www-genie.mrrl.lut.ac.uk
- Started in 1992 by the Economic and Social Research Council, the Global Environmental Change Data
Network Facility seeks to make information exchange among researchers more convenient.
Great Lakes Regional Environmental Information System
http: //ep awww. cie sin. org/
- The Great Lakes Website is a regional directory and data access system developed by CIESIN with
support from the EPA's great Lakes Program, and the Great Lakes National Program Office. It provides
directory information, on-line resources, documentation of EPA's activities in the Great Lakes Region, and
a P2 forum for P2 technical assistance providers and P2 vendor information.
Great Lakes Regional Pollution Prevention Roundtable
http: //www. hazard. uiuc. edu/wmrc/greatl/
- This site provides a forum for the exchange of information on pollution prevention programs, technologies
and regulations impacting the Great Lakes region.
Great Lakes Regional Pollution Prevention Roundtable Tech Info Database
http://es.epa.gov/p2pubs/techpubs/descript.html
- This site provides access to past discussion topics on the Great Lakes Regional Pollution Prevention
Roundtable.
International Cleaner Production Info Clearinghouse (ICPIC)
Telnet service through: fedworld.gov
- The ICPIC site provides international resources on cleaner production techniques.
Kentucky Pollution Prevention Center
http ://www.kppc. org/about.html
- The Kentucky Pollution Prevention Center (formerly Kentucky Partners) is Kentucky's statewide program
helping small and medium-sized manufacturers to identify and implement pollution prevention. They
provide information, technical assistance, training, and applied research to help Kentucky manufacturers to
voluntarily reduce multi-media waste.
Northeast Business Environmental Network (NBEN)
http ://www.nben. org/
- This site provides the latest information on environmental, health and safety issues to businesses of all
sizes and types, technical assistance and regulatory agencies, and environmental groups. NBEN sponsors
workshops and conferences. In addition, NBEN members share information on proven techniques for
implementing environmental management systems and self-auditing.
Ohio Technical Assistance Resources for Pollution Prevention (TARP2)
http://www.epa.state.oh.us/opp/tarp/tarp2.html
- TARP2 is a resource tool designed by the Office of Pollution Prevention within the Ohio Environmental
Protection Agency. TARP2 provides an extensive listing of resources for researching P2 opportunities.
A-58
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Energy Conservation and Pollution Prevention Websites
Pacific Northwest Pollution Prevention Center (PPRC)
http: //pprc. pnl. go v/pprc
- The PPRC is a nonprofit organization that works to protect the public health, safety and the environment by
supporting projects that result in pollution prevention and toxics use elimination and reduction. The database
includes over 300 P2 projects. The site offers search engines, up-to-date newsletters, P2 conference
schedules and abstracts on P2 research projects. Request for Proposals (RFP) Clearinghouse provides
information about P2 projects.
P2GEMS
http ://tun.uml.edu/P2GEMS
- P2GEMS is an Internet search tool for facility planners, engineers, and managers that provides technical,
process, and materials management information on the web. It provides access to over 500 P2 resources on
the Internet.
P2 Pillar Needs Assessment Report for FY96
http://www.wl.wpafb.af.mil/pprevent
- This site provides access to summaries of the U.S. Air Force Environmental, Safety and Occupational
Health Technology Needs Survey. Pollution prevention needs and research on available technology to
address these needs are included in a two volume publication.
Pollution Prevention Yellowpages
http: //www. p2. org/nppr_y p s. html
- The P2 Yellowpages is linked to the Enviro$en$e website and provides information on state, local, and
federal pollution prevention technical assistance programs.
Material Substitution
EPA RTI's Solvent Alternative Guide (SAGE)
http ://clean. rti. org/
- This Database includes a guide to help web browsers find less toxic solvent alternatives. The Solvent
Substitution Database in the Enviro$en$e site is another useful website to explore. Hazardous Solvent
Substitution Data Systems, Solvent Handbook Database Systems, Department of Defense Technical Library,
and the National Center for Manufacturing Science Alternatives Database links are available from
Enviro$en$e.
Environmental Stewardship - Pollution Prevention - Los Alamos National Laboratory (P3O)
Material Substitution Resource List
http://perseus.lanl.gov/NON-RESTRICTED/MATSUB_List.html
- This website provides information on material substitution alternatives and links to over 26 material
substitution related sites on the Internet.
Illinois Waste Management and Research Pollution Prevention Program
http://www.inhs.uiuc.edu/hwric/p2.html
- This site offers a publications list provided by the HWRIC, a division of the Illinois Department of Energy
and Natural Resources.
Recycling Information
Environmental Stewardship - Recycling Programs - Los Alamos National Laboratory
http://perseus.lanl.gov:80/PROJECTS/RECYCLE
- This internet site documents the recycling programs at the Los Alamos National Laboratory. Recycled
materials are listed along with links to other recycling information sites in the country.
Global Recycling Network
http: //grn. com/grn/
- This site provides recycling related information to buyers and sellers of recyclable commodities.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-59
Notes
-------
Appendix A: Energy Conservation and Pollution Prevention Websites
Notes
Recycler's World
http://www.recycle.net
- This site was established as a world-wide trading site for information related to secondary or recyclable
commodities, by products, used surplus items or materials.
Technical Associations. Technology Transfer, and Industry
Air & Waste Management Association
http ://www. awma. org/
- This site provides industry publications, membership information, a buyer's guide, meeting dates,
employment and educational resources, and links to other relevant sites.
Air & Water Management Association
Delaware: http://www.awma.org/section/delaware/delawaremain.htm
South Atlantic: http://www.stackhawk.com/sasmtgs.htm
Baltimore and Washington: http://www.awma.org/baltwash/baltwas.htm
Virginia: http://www. awma. org/dominion/dominion.htm
- These websites contain information regarding the A&WMA activities for members in EPA Region 3.
The American Plastics Council
http ://www.plasticsresource. com/
- The website is organized and formatted to meet the needs of specific user groups. The APC provide
general and environmental information on the server.
Envirobiz - International Environmental Information Network
http: //www. envirobiz. com/
- The site is sponsored by the International Environmental Information Network, and it provides
information about various businesses, policies, environmental technologies, events, products, and
environmental services. The site also has searchable databases.
Environmental Law Institute
http://www.eli.org/
- Incorporates ELI publications, programs, law and policy documents related to environmental law.
The National Institute of Standard and Technology (NIST)
http: /www. ni st. go v/
- NIST provides a wide variety of services and programs to help U.S. industry, trade other government
agencies, academia and the general public improve the quality of their products. The website provides
access to international uniform practices.
National Technology Transfer Center's Environmental Technology Gateway
http: //www. nttc. edu/environmental. html
- This site is an excellent source of links to other environmental information. It provides information on
technology transfer, manufacturing industries, business assistance, conferences, programs, phone numbers,
Pollution Prevention Yellow Pages, other general information and links to over 150 websites. Information
includes links to various agencies (EPA, DOE, DOD, NASA, and others), federal laboratories, and White
House information.
NIST's Manufacturing Extension Partnership
http://www.mep.nist.gov/
- Provides hands-on technical assistance to America's smaller manufacturers.
A-60
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Appendix A: Energy Conservation and Pollution Prevention Websites
Project XL
http://199.223.29.233/ProjectXL/xl_home.nsf/all/homepage
- Project XL is a national pilot program that tests innovative ways of achieving better and more cost-effective
public health and environmental protection. Under Project XL, sponsors (private facilities, industry sectors,
Federal facilities, and communities) can implement innovative strategies that produce superior environmental
performance, replace specific regulatory requirements, and promote greater accountability to stakeholders.
The website provides information on the specific XL projects, legal and policy documents, EPA contacts and
access to an XL Communities Home Page.
The Tellus Institute
http://www.tellus.com
- The Tellus Institute is a nonprofit organization that offers P2 information regarding resource management
and environmental issues.
UCLA Center for Clean Technology (CCT)
http://cct.seas.ucla.edu/cct.pp.html
- The site provides information on P2 research conducted at the CCT. Research and novel educational efforts
focus on developing innovative technologies and improving the understanding of the flow of materials.
United Nationals Environment Program
http ://www.unep. or.jp/
- This site provides a survey of databases on environmentally sound technologies
The Water Environment Federation
http://wef.org/
- The WEF provides information on information searches, links, catalogs, events, missions and other
activities as they relate to water issues.
Waterwiser
http: //www. waterwi ser. org/
- Waterwiser provides a source of information on water efficiency and conservation.
Design for the Environment
Carnegie Mellon University Green Design Initiative Home Page
http://www.ce.cmu.edu/GreenDesign/
- This site provides access to research, publication lists, and education programs in green design.
Pacific Northwest Laboratory's Design for Environment Page
http: //pprc. pnl. go v/pprc
- The PPRC is a nonprofit organization that works to protect public health, safety and the environment by
supporting projects that result in pollution prevention and the elimination or reduction in toxics use. The
database includes over 300 P2 projects. The request for Proposals (RFP) Clearinghouse provides information
about P2 projects. The site offers search engines, up-to-date newsletters, P2 conference schedules and
abstracts on P2 research projects.
Sources of Environmental Responsible Wood Products
http: //www .ran. org/ran/ran_c amp ai gns/r ain_wood/index. html
- Information on environmentally sound wood product alternatives is available at this site.
UC Berkeley Consortium on Green Design and Manufacturing
http: //greenmfg. me. berkeley. edu/green/Home/Index. html
- Research, publications, contacts and green design software is available at site.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-61
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Appendix A: Energy Conservation and Pollution Prevention Websites
Notes
State Internet Programs
Alabama DEM
http://www.adem.state.al.us
- This site offers information on ADEM contacts, organization structure, rules and regulations, daily ozone
and AQI and a calendar of events.
California Environmental Protection Agency (Cal/EPA), Dept of Toxic Substances Control
http ://www. calepa. ca. gov/dtsc/txpollpr.htm
- This site provides a list of publications for various processes and industries.
Colorado Dept of Public Health & Environment
http: //www. sni. net/li ght/p 3 /
- This site has information on the P2 program's free, confidential on-site assessments; telephone
consultations; industry-specific fact sheets and case studies; training programs and technical workshops; a
resource library; presentations to trade and industrial organizations; program development and support for
local governments and tribes; grants for entities involved in providing pollution prevention educational and
outreach activities; and technical assistance.
Connecticut Dept. of Environmental Protection, P2 & Compliance Assurance
http://dep.state.ct.us/Cmrsoffc/Initiatv/p2.htm
- This site provides technical assistance to state agencies and small businesses; and educational programs
for the public, businesses, and institutions, financial assistance for small businesses, and evaluation of
marketing strategies, incentives and other forms of assistance for development of new technologies or
products that support pollution prevention.
Delaware DNREC
http: //www. dnrec. state. de. us/
- This site provides access to DNREC air, waste, water, and emergency services programs.
pollution prevention programs for businesses is available through this site.
Links to
Florida DEP Pollution Prevention Program
http://www.dep.state.fl.us/waste/programs
- Direct access to Florida's P2 resource center and technical assistance programs is available at this site.
Factsheets, case studies and a calendar of events is also available.
Georgia Pollution Prevention Assistance Division
http://www.Georgianet.org/dnr/p2ad/
- Provides a list of servers and P2 assistance programs on national and regional levels.
Illinois Waste Management and Research Center
http ://www.hazard.uiuc. edu/wmrc/
- This site provides information on available pollution prevention services, access to library/clearinghouse,
research funding and GLS and environmental database services.
Indiana Dept. of Environmental Management, Office of P2 & Technical Assistance
http://www.state.in.us/idem/
- This site includes information on source reduction plans for industries to prevent pollution, grant programs
to encourage innovation in pollution reduction, state-wide recycling efforts, and education and outreach
efforts through workshops and seminars.
Kansas State University Pollution Prevention Institute
http://www.oznet.ksu.edu/dp_nrgy/ppi/ppihome.htm
- This site provides access to PPI fact sheets, case studies, publications list and staff.
A-62
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Energy Conservation and Pollution Prevention Websites
Kentucky Pollution Prevention Center
http ://www .kppc.org/
- Pollution prevention staff, newsletters, training calendar and information on the materials exchange, ISO
14000/EMS Alliance, Wood Waste Alliance, environmental justice and other useful sites are available.
Kentucky Business Environmental Assistance Program
http://gatton.gws.uky.edu/KentuckyBusiness/kbeap/kbeap.htm
- Regulatory updates, publications, permit applications and other related sites are accessible through this site.
Louisiana DEQ Home Page
http://www.deq.state.la.us/
- This site provides access to DEQ Offices and a calendar of events. The search engine searches for specific
topics by using key words and phrases.
Maine DEP's P2 Resource List
http://www.state.me.us/dep/p21ist.htm
- In addition to providing general P2 information on their website, the Maine Department of Environmental
Quality lists pollution prevention resources available on the Internet. Technology transfers, P2 equipment
information, on-line networking, library information, document search, chemical data, regulatory, recycling,
and environmental software links are listed in the server.
Michigan DEQ
http://www.deq.state.mi.us/ead/
- This website contains pollution prevention information provided by the Michigan EPA. Regional
information regarding the Environmental Assistance Division is provided. Program descriptions, contact
names, bulletins, calendars, publications, fact sheets and other Internet linkages to Environmental sites are
listed.
New Jersey Technical Assistance Program for Industrial Pollution Prevention
http: //www. nj it. edu/nj tap
- This site contains information on NJTAP's functions: provides environmental opportunity assessments;
functions as an information clearinghouse for literature and videotapes related to pollution prevention;
delivers education and training; and adopts and develops novel pollution prevention technologies.
New York Dept. of Environmental Conservation, P2 Unit
http://www.dec.state.ny.us/website/pollution/prevent.html
- The P2 Unit provides technical and compliance assistance to help public and private interests. The P2 Unit
implements regulatory programs and encourage public and private interests to avoid generating pollutants and
to reduce, reuse and recycle waste materials to attain a 50-percent reduction in waste.
North Carolina Waste Reduction Resource Center of the Southeast
http: //owr. ehnr. state. nc. us/wrrc/
- The WRRC, located in Raleigh, NC, was established in 1988 to provide multimedia waste reduction support
for U.S. EPA Regrons III and IV.
Ohio EPA Office of Pollution Prevention
http://www.epa.ohio.gov/opp/oppmain.html
- This website lists the service provided by the Ohio EPA and provides an extensive list of resources available
in researching pollution prevention opportunities.
Pennsylvania DEP - P2 and Compliance Assistance
http://www.dep. state.pa.us/dep/deputate/pollprev/pollution_prevention.html
- Access to publications, conference information and current events, as well as green technologies and
technical assistance.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-63
-------
Appendix A: Energy Conservation and Pollution Prevention Websites
Notes
Pennsylvania Small Business Assistance Program
http://www.dep. state, pa. us/dep/deputate/airwaste/aq/Small_Business/small_business. htm
- This site offers hands-on assistance for small businesses from the PA EPA. Specific regulations and P2
opportunities for several industries are mentioned.
TNRC (Texas) Office of P2 and Recycling
http://www.tnrcc.state.tx.us/exec/oppr/index.html
- Pollution prevention programs, staff and access to the Small Business Assistance Program
(http://www.mrcc.state.tx.us/exec/small_business/index.html) is accessible through this site.
Virginia DEQ, Office of Pollution Prevention
http://www.deq.state.va.us/opp/opp.html
- This site contains fact sheets, success stories, a newsletter, publications, p2 links, and a link to Businesses
for the Bay.
Washington Department of Ecology Home Page
http://www.wa.gov/ecology/
- Access to Ecology resources, laws and regulations, tools, and publications is available at this site.
Academic Resource Centers
The National Pollution Prevention Center (NPPC) for Higher Education
http://www.umich.edu/~nppcpub/index.html
- The site provides educational material to universities, professionals and the public. The NPPC actively
collects, develops and disseminates pollution prevention educational materials.
Federal Government Sites
The Code of Federal Regulations
http://law.house.gov/cfrexpl.htm
- This site contains a complete list of federal regulations.
Department of Energy's Environmental Management Home Page
http://www.em.doe.gov/
-This site provides access to DOE's environmental management page and information clearinghouse.
Fedworld
http://www.fedworld. gov/
- This website provides a gateway to over 125 federal Bulletin Boards.
Library of Congress
telnet: ://locis. loc.gov/
- This site allows the web browser to search for topics by author, book, subject, keyword, etc.
Research Triangle Park Air BBS
telnet: //ttnbb s. rtpnc. ep a. go v/
- The website provides information for professionals in the air monitoring and air pollution control areas.
THOMAS
http: //thomas. loc. gov/
- The website contains full text documents of current congressional legislation.
A-64
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix A: Energy Conservation and Pollution Prevention Websites
Environment. Health, and Safety
Great Links Page
http://tis.eh.doe.gov/
- The website provides accurate and current information regarding MSDS sheets, EPA Chemical Fact Sheets,
and other topics related to materials, health and safety.
OSHA
http://www.osha. gov/
- This website provides information on OSHA standards, programs and services, compliance assistance
programs, and technical information.
Water Online
http: //www. wateronline. com/
- This site supplies information on manufacturers markets, discussion forums, engineering technology,
resource libraries and associations.
Energy Conservation Related Servers
Climate Wise
http://www.epa.gov/oppeinet/oppe/climwise/cwweb/index.htm
- This site provides information on EPA's Climate Wise program; a government-industry partnership that
helps businesses improve energy efficiency and reduce greenhouse gas emissions.
DOE Energy Efficiency and Renewable Energy Network
http://www.eren.doe.gov/
- This site is the primary page for obtaining information from Energy Efficiency.
The Electric Power Research Institute (EPRI)
http: //www. epri. com/
- EPRI provides research and development activities and P2 initiatives for the electric utility industry.
The Energy Analysis and Diagnostics Center (EADC)
http://128.6.70.23/
- This site provides links to information from the Industrial Assessment Center headquartered at Rutgers
University.
Energy Information Administration
http://www.eia.doe.gov/
- This site offers information on energy prices, consumption information, and forecasting for a variety of fuel
groups.
Technology Transfer
EPA Online Library System
telnet://epaibm.rtpnc.epa.gov/ Login Password: "public access"
- The site provides web browsers access to a hazardous waste database.
National Technology Transfer Center's Environmental Technology Gateway
http: //www. nttc. edu/environmental. html
- This site is an excellent source of links to other environmental information. Provides information on
technology transfer, manufacturing industries, business assistance, conferences, programs, phone numbers,
Pollution Prevention Yellow Pages, other general information and links to over 150 websites. Information
includes links to various agencies (EPA, DOE, DOD, NASA, and others), federal laboratories, and White
House information.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-65
Notes
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Appendix A: Energy Conservation and Pollution Prevention Websites
Notes
Plating/Finishing
American Electroplating and Surface Finishing Industry Home Page
BB # 201-838-0113 or http://www.aesf.org
-The website features Industry specific information regarding P2 technologies and environmental issues in
the Electroplating and surface Finishing Industry.
Finishing Industry Homepage
http: //www. finishing, com
- This site provides information on new technologies, resources, conferences, and problems encountered by
businesses involved in metal finishing, specifically anodizing, plating, power coating, and surface finishing.
National Metal Finishing Resource Center
http://www.nmfrc.org
- Provides vendor information, compliance assistance and access to Common Sense Initiative research and
development and access to a technical database.
ISO 14000
EPA Standards Network (ISO 14000)
http://es.epa.gov/partners/iso/iso.html
- The website provides information on ISO Environmental Management Standards and their potential
impact in the United States.
Exploring ISO 14000
http: //www. mgmt 14k. com
- A primer to the ISO 14000, this site includes features like frequently asked questions, full text articles.
The site covers ISO 14000 in depth and touches on ISO 9000 as well.
International Organization on Standardization (ISO)
http://www.iso.ch/meme/TC207.html
- The official organization for information on ISO 14000 and other international standard documentation.
The URL points to the actual provisions of the ISO 14000 as directed by the Technical Committee 207, its
administering body.
ISO 14000 Info Center
http://www.ISO14000.com/
- This website provides information on ISO 14000 articles, education and training, opportunities, a list of
certified companies, publications, organizations, and other resources.
ISO Online
http://www.iso.ch/infoe/guide.html
- ISO Online is an electronic information service providing information on international standards, ISO
technical committees, meetings, and calendar.
NIST's Global Standards Program (GSP)
http://ts.nist.gOV/ts/htdocs/210/216/216.htm
- NIST promotes the economic growth of U.S. industry by helping develop and apply technology. General
ISO 14000 information is provided.
Laser Printer Toner Cartridge Remanufacturing Information
http: //www. toners, com/
- Describes a list of products and available locations.
A-66
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Appendix A: Energy Conservation and Pollution Prevention Websites
Printing Industry of America
http://www.printing.org/
- Provides information on technical assistance, education and publications, industry research and upcoming
legislation.
Printer's National Environmental Assistance Center
http://www.inhs.uiuc.edu/pneac/pneac.html
- Provides documentation of environmental impacts of the printing industry and offers technical assistance to
the printing industry. The site has links to Enviro$en$e and other websites.
Affirmative Procurement
Affirmative Procurement
http://www.epa.gov/epaoswer/non-hw/procure.htm
- This website provides a list of guidelines and resources to assist federal, state, and local agencies and others
purchase and use products containing recovered materials.
Compliance Assistance
Agriculture Compliance Assistance Center (AgCenter)
http://es.epa.gov/oeca/ag/
- The AgCenter provides "one-stop shopping" for the agriculture community, including information on the
latest pollution prevention technologies and EPA requirements.
Automotive Service and Repair: Greenlink™
http ://www. ccar-greenlink.org
- This site offers access to environmental compliance information and pollution prevention information to
those working in the automotive service, repair, and autobody industry.
National Metal Finishing Resource Center
http://www.nmfrc.org/welcomel .htm
- This website offers vendor directories, technical databases, conference information, and compliance
assistance.
Cleaner Production
Climate Wise
http://www.epa.gov/oppeinet/oppe/climwise/cwweb/index.htm
- This site provides information to EPA's Climate Wise program; a government-industry partnership that
helps businesses improve energy efficiency and reduce greenhouse gas emissions.
United Nations Environment Programme
http: //www. unep .or.jp/
- This site provides a survey of databases on environmentally sound technologies.
Life Cycle Analysis
Life Cycle Assessment
ECOSITE
http://www.ecosite.co.uk/
- Provides information on recent events in LCA, case studies and downloadable copies of software.
European Network for Strategic Life Cycle Assessment Research and Development
http: //www. leidenuniv. nl/interfac/cml/lcanet/hp22. htm
-A platform for LCA research and development.
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency A-67
Notes
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Appendix A: Energy Conservation and Pollution Prevention Websites
Notes
EcoDS (Environmentally Conscious Decision Support System)
http://shogun.vuse.vanderbilt.edu/usjapan/ecods.htm
- Site for a decision support tool for a cost-risk evaluation of environmentally conscious alternatives using
streamlined LCA.
A-68
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Appendix B: Thermodynamic Analysis
APPENDIX B
THERMODYNAMIC ANALYSIS
Topics covered are selected materials from thermodynamics. Included are areas that are most likely
to be less familiar to a general auditor.
Psychrometrics
Psychrometrics is the study of moist air equilibrium thermodynamics process. Why is it important?
People need to maintain an internal environment that is comfortable (temperature, humidity, fresh air).
Therefore, the HVAC system must regulate all three variables.
Exhibit B.1: Variable for HVAC Regulation
Variable
Temperature
Humidity
Air Flow
Summer
High
High
Low
Winter
Low
Low
Low
The brief summary covers:
1. Properties of real air
2. Limitations due to saturation (Boiling Curve)
3. Definitions of state variable
• Humidity Ratio (Ib of moisture/lb of dry air)
• Enthalpy (Btu/lb of dry air)
• Specific Volume = 1/Density
The molecular weight of air is given as:
m = 28.9645-
Ibm
Ibxmol
Thus, the gas constant can be found fcr air, Rj, by dividing the universal gas constant by the
molecular weight.
1545.32 ftxlb
Ra = = 53 .352
28.9645
IbmxR
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
B-l
-------
Appendix B: Thermodynamic Analysis
Notes
Properties of Air
Exhibit B.2: Components of Air
Component
N2
02
Ar
C02
Ne
He
CH4
H2
S02
Kr
Xe
03
% By Volume
78.8
20.95
0.93
0.03
0.0018
0.005
0.00015
0.00005
Small
Small
Small
Small
Water Vapor
By manipulating the ideal gas equation, a relationship between the ideal gas law and the density for
air can be developed.
PV = mRT or p= — =
K V RT
Looking at the new equations one can see that the density in the inversely proportional to the gas
constant R. So using the information obtained for air in the previous section the density of air to the density
of water vapor based on proportionality can be compared.
1 1
Ch x » Ov oc -
53.352 '" 85.778
From this, it can be concluded that water vapor is much less dense than dry air.
Real Air (Moist Air)
Realistically, air is not completely dry; it contains some moisture.
• x% Water Vapor
• (l-x)%DryAir
In order to determine the density of real air, one must consider the densities of both dry air and water
vapor.
P=
Then substitute the densities with the ideal gas relation found in the previous section.
B-2
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix B: Thermodynamic Analysis
Pa \
~ RaT Rv,T
P-Pw Pw
RaT
p
j^i-—;
RaT RaT Rw
p Pw
= — 0.378—-
RaT RaT
Amount of Water Vapor in a Moist Air Mixture
The amount of moisture in air is described by the humidity ratio, W. The humidity ratio can be
defined by:
_ Ibmof moistureIV
Ibm of dry air / V
Some manipulation and substitution yields an expression for the humidity ratio.
„.
W =
x =
18.015
xama m_ 28.9645
Xa 1-Xw
0.622 —
W =•
1--
• = 0.622 Pw =0.622 —
P-Pw Pa
P
This expression shows that the humidity ratio is proportional to the ratio of water pressure to the air
pressure. The figure below shows how the humidity ratio varies with respect to temperature. As one can see,
the humidity ratio increases significantly as temperature increases.
Exhibit B.3: Humidity vs. Temperature
(Boiling Curve)
boiling
Energy Content
Enthalpy, h, is a measure of the energy content in the air. The enthalpy of an air/moisture mixture
can be expressed as:
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
B-3
-------
Appendix B: Thermodynamic Analysis
Notes
h = ha +Whw
using
ha=0.24T
where
hfg = latent heat of vaporization, Btu/lb
Cp, s = specific heat of water vapor = .0444 Btu/lb - °F
Substituting these in for the first equation results in:
h = 1075. 15 + 0.444 (T - 32)
= 1061 +.0444
.-. h = 0.24r + ^(1061 + .444T)
where
T is in °F
W is in Ibm, w/lbm, a
Relative Humidity
_p
w,s f(T}
P^
P _ P-
Pw,
P
where Pw s is found from the Boiling Curve
Given 4> and T to get W:
1 . T — > Pw s (from Boiling Curve)
2. PW=(|)PW,S
3. W = 0.622 (PW/(P-PW)
Specific Volume
Specific volume is defined as the volume per unit mass.
V
Va =
ma
Once again using the ideal gas law
B-4 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix B: Thermodynamic Analysis
PV = RT
RaT RaT RaT
Pa P-PW Jon—
P
= [1+1.608^]
Pa
Since specific volume is volume divided by mass, it can also be defined as the inverse of density
(mass divided by volume).
1
P= —
Va
Psvchrometric Example
Given :Ti = 90 °F, =.090
Calculate the energy per poundof dry air to coolto 57°F, 0= 1.
Method 1 ('Analytical')
• At State 1 :
(from Table 2 in Chapter 6 of ASHRAE Fundamentals)
Pws, 1=0. 6489 psi
P = (0.90)(0.6489 ) = .0629 psi
W\ = 0.622 x 0.629(14.7 - 0.629) = 0.02780 [Ibm/lba]
hi = (0.24 )(90) + (0.02780 )[1061 + (0.444 )( 90)] = 52 .2
State 3
Pwas,3 = Pws, 57 degF = 0.2302 psi
h =(0.24)(57) +(0.009895 )[1061 +(0.444)(57)] = 24.4[Btu/lb.]
.-. /\h = 24.4 - 52.2 = -27 .8 [Btu/lb of dry air]
Method 2 ('Graphical')
1. Locate point 1 at TI =90°F, (JFO.90
Read hi « 52. 5 Btu/lb
2. Locate point 3 at T3 =57°F, fy=l
Readh! « 24 Btu/lb
3. Calculate Ah
Ah= 24 -52.5 = -28.5
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency B-5
-------
Appendix B: Thermodynamic Analysis
Notes
Exhibit B.4: Humidity vs Temperature (Boiling Curve)
For Psychrometric Example
W
Air Conditioning Processes
Air conditioning of air is done to ensure proper conditions for a specific process or make more
pleasant working environment for the people.
Heat Addition to Moist Air
Exhibit B.5: Humidity vs. Temperature
B-6
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix B: Thermodynamic Analysis
Exhibit B.6: Conservation of Mass
STEAM i
•
ma,1
hi-
Wi
Conservation of mass
Conservation of energy
ma,\ = ma,2
lha,\W\ = lha,2W2
q\ -> 2 = ma,\(h2-h\)
Example
Given : T\ = 35°F,0i = 100%, 20,000 cfmi
Air to be heatedto 100 °F
Find : The heater size required.
State 1
Specific volume = 1 /Density
1 RT
— = — — [1+1. 608 IF]
v = — =
P
p=-
Pa,\
(14.7)(144)
ma,2
W2
State 2
(53.35)(460 + 35)(1= 1.608^1)
Pws.i = 0.09998 -+ from tables or charts at 35°F
.-./>= (0.09998)(1) = 0.09998
W\ = 0.622 x 0.09998 /(14.7 - 0/0.09998) = 0.004259
.-. h\ = (0.24)(35) +(0.004259 )[1061 + (0.444)(35)]
fe = 12.985Btu/lb
W 2=^1=0.4259
hi= (0.24)(100) + (0.004259 )[1061 +(0.444)(100)]
h 2 =28.708
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
B-7
-------
Appendix B: Thermodynamic Analysis
Notes
Calculate the mass flow rate of air:
ma = (20,000
min hr
(14.7)044)
)pb,i
(53.35)(495)[1+(1.608)(0.004259 ;
• = 0.07961'
Ib
ma = (20,000
Ib
)(0. 07961 --) = 95,534
min hr /A3 hr
i = (95,534— )( 28.708 -12.985 — ) = 1 .502million—
hr Ib hr
nboiler
0.8
=1.878x10
Cooling of Moist Air
Exhibit B.7: Humidity vs. Temperature
W
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix B: Thermodynamic Analysis
Exhibit B.8: Mass Conservation
ma,1
hi
1
1
i ^~^ -s
J 1
i
W
mw,h
Exhibit B.9: Boiling Curve
hi -ha is all latent heat removal
/?a - /Z2 is all sensible heat removal
/n - hi is total heat removal
hi
Wi
Determine the tons of refrigeration required to cool 10,000 cfrn of air at 85 °F
dry bulb teperatuie, 0= 0.50, to 50°F,= 1.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
B-9
-------
Appendix B: Thermodynamic Analysis
Notes
Exhibit B.10: Boiling Curve
W
50
85
From the chart
him 34. 5
/*2«20.2
vi « 14.01
Wi* 0.013
0.0076
From tables hWi2 =18.11 Btu/lb a
or
hw,2 =CP = l{Btu/[lb deg F(50 -32 degF)]} = 18 Btu/lba
rha =(10,000 ft 3/min)/(14.01ft3 /min) =713.8 Ib dry air per minute
q\ -> 2 = ma[(hi - hi) + (W\-W2)hw)
= [713.8(lb/rmn)]{[20. 2-34.5(Btu/lb)] +(0.013-0.0076)(18)(Btu/lb)} =-10.138 Btu/min
That is, the heat removal rate is 10,138 Btu/min or 608,278 Btu/h.
1 ton of A/C = (1 ton of ice/day)x (day/24 hr) x (144 Btu/lb) x (20001b/to n)
where the later heat of fusion for ice is 144 Btu/lb.
1 ton fo A/C =12,000 Btu/h
608,278Btu/hr
• = 50.7tons
Heat Loss Calculations
where
Q= total heat loss
QTRANS = transmission heat loss
QINFIL = infiltration heat loss
12,000 Btu/hrton
Q - QTRANS + QINHL
B-10
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix B: Thermodynamic Analysis
QTRANS = UA(T1-T0)
where
UA = heat loss coefficient
Tj = inside air temperature
T0 = outside air temperature
QlNFIL ~ QsENS +
LATENT
where
QSENS = sensible heat loss
QLATENT = latent heat loss
— T/ r1 /"T T ^
SENS" vp ^pUi ~ J-oJ
where
V = volume of air entering building
p = air density
Cp = specific heat of air
QLATENT:
where
W; = inside air humidity ratio
W0 = outside air humidity ratio
h^ = latent heat of vapor at T;
Simple Equations for Standard Air
QSENS = 0.018 xV(Ti-To)
QLATENT = 79.5 xFCW,-W0)
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency B-l 1
-------
Notes
Appendix B: Thermodynamic Analysis
Heat Gain Calculations
where
where
Q - QTRANS + OPEN + Or
:NT
QFEN = fenestration heat gain
QINT = internal heat gain
(QTRANS / A) = cat + h(To- Ti) -
a= absorptanoe of surface for solar radiation, no unit
It = solar radiation incident on surface, Btu/hr ft
ho =heat transfer coefficient, BTU/hr ft
To = outdoor air temperature, °F
Ts = surface air temperature, °F
e= emittance of surface, no units
R = difference between radiation incidence on the surface and
black body radiation at To, Btu/hr ft2
(QTRANS /A) = ho(TsoL - AIR - Ts)
T SOL - AIR = To + cLIho - s3l I ho
B-12
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Appendix C: Instrumentation for Audits
APPENDIX C
ENERGY AND WASTE INSTRUMENTATION FOR ASSESSMENTS
It is important to be able to gather all the information necessary for competent evaluation of energy
usage and waste generation. Hardware designed to help data collection is available and should be used. Since
manufacturers of measuring equipment constantly strive for better products it is a good practice to keep up
with the latest development in the field. Then one is able to make use of state-of-the-art technology to achieve
better results in his or her own work.
Equipment List
_1. Thermo Anemometer
_2. Velometer - (Analog)
_3. Amprobe Ampere Meter (Digital)
4. Amprobe Ampere Meter (Analog)
5. PWF Meter
6. Rubber Gloves
7. Infra Red-Temp Sensor - Kane May 500
8. Temperature Probes/Flukes Meters
9. Light Meters
10. Combustion Analyzer - Kane May 9003 (Silver)
11. Combustion Eff. Computer and Separate Probe
12. Ultra Sonic Flow Meter
13. Drill and Bit from ME shop
14. Safety Glasses, Ear Plugs
15. Dust Masks
16. Amprobe Chart Recorder
17. Energy Conservation Opportunity Books
18. Tool Box (include flashlight, wire brush, rags)
19. Preaudit Data Sheet
Number of Cases taken to site
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency C-l
-------
Appendix C: Instrumentation for Audits
Notes
Product and Supplier List
Combustion Analyzer
Energy Efficiency Systems
Enerac 2000 - $3,000
Pocket 100 - $1,500
1300 Shames Drive
Westbury,NY11590
(800) 695-3637
Universal Enterprises
KM9003 - $2,000
5500 South West Arctic Drive
Beaverton, OR 97005
(503) 644-9728
Goodway Tools Corporation
ORSATandEFF-1
404 W. Avenue
Stanford, CT 06902
(203) 359-4708
Bacharach, Inc.
FYRITEII-$695
625 Alpha Drive No CO or Combustibles
Pittsburgh, PA 15238
(412) 963-2000
Dwyer Instruments, Inc.
Highway 212 at 12
P.O. Box 373
Michigan City, IN 46360
(219) 872-9141
Milton Ray Company
Hays-Republic Division
742 East Eighth Street
Michigan City, IN 46360
Burrell Corporation
2223 5th Avenue
Pittsburgh, PA 15219
Amp Probe
Grainger
Analog Amprobe #RS3 - $100
Digital Amprobe #3A360 - $350
4885 Paris Street
Denver, CO
(303)371-2360
Cogeneration:
Martin Cogeneration Systems (913) 266-5784
1637 SW 42nd St.
PO Box 1698
Topeka,KS 66601
Waukesha/Dresser
Waukesha Engine Division
Dresser Industries
lOOOWSt. PaulAve.
Waukesha, WI 53188
Tecogen Inc.
45 IstAve.
PO box 9046
Waltham, MA 02254-9046
Stewart and Stevenson, Inc.
Gas Turbine Product Divisbn
16415 Jacintoport Blvd.
Houston, TX 77015
(713)457-7519
Boilers:
Kewanee Boiler Corporation
Suite 200
16100 Chesterfield Village Parkway
Chesterfield, MO 63017
(314) 532-7755
Boiler Efficiency Institute
School of Engineering
Auburn University
PO Box 2255
Auburn, AL 36830
(Steam Traps)
Yarway Corporation
PO Box 1060
Wheaton,IL60189
(312)668-4800
Weben-Jarco Inc.
PO Box 763460
Dallas, TX 75376-3460
Uniluc Manufacturing Company Inc.
(416) 851-3981
140HanlanRd.
Woodbridge (Toronto) Ontario, Canada L4L3P6
C-2
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix C: Instrumentation for Audits
Waste Heat Recovery:
Beltran Associates, Inc.
200 Oak Dr.
Syoset,NY11791
(516)921-7900
Therma Stak
1-800-521-6676
Des Champs Labs Inc.
(201) 884-1460
Z Duct Energy Recovery Systems
PO Box 440
17FarinellaDr.
East Hanover, NJ 07936
ITT Bell & Gossett
8200 N. Austin Ave.
Morton Grove, IL 60053
(708) 966-3700
Ingersoll Rand
1-757-485-8037
Taco, Inc.
1160 Cranston St.
Cranston, RI 02920
(401) 942-8000
Lighting:
Valmont Electric (217) 446-4600
Hunt Electronics
1430 E. Fairchild St.
Danville, IL 61832
The Watt Stopper, Inc.
296 Brokaw Rd.
Santa Clara, CA 95050
(408)988-5331
MagneTek Universal Manufacturing
200 Robin Rd.
Paramus, NJ 07652
(201) 967-7600
Philips Lighting Company (908) 563-3000
200 Franklin Square Dr.
PO Box6800
Somerset, NJ 08875-6800
Powerline Communications, Inc.
(Light Controls)
123 Industrial Ave.
1-800-262-7521
Williston, VT 05495
Conservolite, Inc.
PO Box 215
Oakdale, PA 15071
(412) 787-8800
General Electric
4400 Cox Rd.
Glen Allen, VA 23058-4200
1-800-327-0097
Implementation Costs/Pricing:
RS Means Company Inc. 1-800-334-3509
100 Construction Plaza
PO Box 800
Kingston, MA 02364-0800
Grainger
Regional Offices
http: //www. grainger. com
General Information:
ASHRAE Handbook of Fundamentals
HVAC:
McQuay - Perfex Inc.
13600 Industrial Park Blvd.
PO Box 1551
Minneapolis, MN 55440
Weben Jarco, Inc.
(Hot Water Systems)
4007 Platinum Way
Dallas, TX 75237
1-800-527-6449
ECCI
(Evaporative Cooling)
PO Box 29734
Dallas, TX 75229
(214) 484-0381
Carrier Corporation
(Chillers)
Syracuse, NY 13221
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
C-3
-------
Appendix C: Instrumentation for Audits
Notes
Trane Company
Clarksville, TN 37040
The Marley Cooling Tower Company
(Cooling Towers)
5800 Foxridge Dr.
Mission, KS 66202 (913) 362-1818
Roberts - Gordon Appliance Corporation
(Radiant Heaters)
PO Box 44
1250 William St.
Buffalo, NY 14240
(716) 852-4400
Air Compressors:
Ingersoll Rand Company
5510 77 Center Dr.
PO Box 241154
Charlotte, NC 28224
Gardner-Denver Company
Motors:
GE Company
Motor Business Group
1 River Rd.
Schenectady, NY 12345
Variable Speed Drives:
York International
Applied Systems
POBoxl592-361P
York, PA 17405-1592
(717)771-7890
ABB Industrial Systems, Inc.
Standard Drives Division
88 Marsh Hill Rd.
Orange, CT 06477
Allen Bradley
Drives Division
Ceadarburg, WI 53012-0005
Enercon Data Corporation
7464 W. 78th St.
Minneapolis, MN 55435
(612) 829-1900
Belts:
The Gates Rubber Company
990 S. Broadway
PO box 5887
Denver, CO 80217
(303)744-1911
Additional Resources
1. Thumann, Albert, Handbook of Energy Audits, Association of Energy Engineers, Atlanta, GA (several
editions).
2. Industrial Market and Energy Management Guide, American Consulting Engineering Council, Research
and Management Foundation, 1987.
3. Energy Conservation Program Guide for Industry and Commerce, NBS Handbook 115 and Supplement,
U. S. Department of Commerce and Federal Administration, U. S. Government Printing Office, 1975.
4. Mark's Handbook of Mechanical Engineering, Baumeister (Ed.), McGraw-Hill, Eight Edition, 1978.
5. ASHRAE Handbooks, Fundamentals, Systems, Equipment, Application, HVAC and Refrigeration
Volumes, American Society of Heating, Refrigeration and Air Conditioning Engineers.
C-4
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix D: Definitions
Abrasive Blasting:
Air/Fuel Ratio:
Aleophilic:
Assessment:
Barrels:
Baseline Year:
Block:
BOD:
Boiler:
Broaching:
Brownstock
Washing:
British Thermal Unit
(BTU or Therm):
Capacitance (Farad):
CCF:
Cellulose Fiber:
Celsius:
Chilled water:
Climate:
Coefficient of
Performance:
Cogeneration:
Collector:
Combustion:
Commingled:
Condensate:
Condenser:
APPENDIX D
DEFINITIONS
Refers to any paint stripping technique that utilizes grit and other abrasives.
The Ratio of combustion air to fuel supplied to the burner.
A term that refers to mediums that attract oil.
Industrial assessments are an in-depth review of existing operations to increase
efficiency of the operation through pollution prevention and energy
conservation.
The portion of an injection molding machine through which the molten plastic
is forced by the piston.
The year that pollution prevention gains are measured from.
A division of billing based on usage. The total block amount of use is divided
into blocks of different price perunit of use.
Biochemical Oxygen Demand.
A device where energy extracted from some type of fuel is converted into heat
which is distributed to needed places to do useful work
A process in which internal surfaces are finished.
A cleaning stage applied to the brown pulp produced by the pulping stage.
British thermal unit. It is the amount of energy to increase or lower one pound
of water one degree Fahrenheit.
The farad is the electrostatic capacitance that will hold a charge at a pressure of
one volt.
One hundred cubic feet of gas. (Typically 1 Therm =1.02 CCF)
The desired pulp content after the pulping process.
A metric unit for temperature measurement.
Water in the evaporator that is cooled when heat is removed to vaporize the
refrigerant.
All climates
The ratio between thermal energy out of and electrical energy into the system.
The simultaneous production of electric power and use of thermal energy from
a common fuel source.
Panels for collecting sun's radiation and transforming it into electricity.
A release of heat energy through the process of oxidation
Describes materials that are mixed (i.e. not separated by composition).
The hot water condensed from cooled steam.
The unit on the chiller in which heat is transferred out of the refrigerant. Cool
condensing water flows over the tubes containing a vaporized refrigerant in a
tube-and-shell heat exchanger. As the refrigerant cools, it condenses into a
liquid and releases heat to the condensing water.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
D-l
-------
Appendix D: Definitions
Notes
Condensing Water:
Constant:
Convey orized:
Cooling tower:
Current (Ampere):
CVD:
Degree Day:
Degree Heating:
DEHP:
Delignification:
Demand:
Demand-side
Management
Strategy:
Dewatering:
Digestion Liquor:
Dioxins:
Drag-out:
Duty Cycle:
Economizer:
Electrodeposited
Materials:
Energy (Joule):
Energy Conservation:
Enthalpy:
Evaporator:
Water that has been cooled in a cooling tower that is used to condense
vaporized refrigerant in the condenser.
Multiplier used in computing electric meter reading.
Describes equipment that is continuous.
A device to dissipate heat by evaporation of water which is trickling from
different levels of the tower.
The ampere, the rate of flow of a unvarying electric current.
Chemical Vapor Deposition
Mean daily temperature subtracted from 65 used to realistically measure
heating requirements from one month to another
A measure relating ambient temperature to heating energy required. If the
outside temperature is 1 degree below the base temperature in the plant for 1
hour then that represents 1 degree heating hour.
Diethylhexylphthalate
An extended pulping process that can lower contamination in the pulp.
Highest amount of electricity used in 15-30 minute periods during any one-
month. Power companies must have the generating capacity to meet the
demands of their customers during these peak period, otherwise the result
would be blackouts.
Strategic energy conservation.
Refers to any process designed to remove water from the waste sludge.
The liquid that the pulp is processed in.
Are environmentally detrimental chemical compounds composed of identical
carbon-oxygen framework.
The fluid unintentionally removed from a bath while removing a part.
Controlled interruption of a piece of equipment's operation that is within its
operating band.
Air-to-liquid heat exchangers
Materials deposited by the electroplating process.
The joule is the energy conveyed by one watt during one second; the kilowatt
hour (kWh) is one kilowatt flowing for one hour.
The use of any reasonable mechanism to successfully reduce consumption in a
facility.
A measure of the heat content of a media, reflecting moisture content and
temperature.
The unit on the chiller in which heat is transferred to the refrigerant. Warm
water flows over tubes containing a liquid refrigerant in a tube-and-shell heat
exchanger. Heat is extracted from the water as the refrigerant vaporizes and the
temperature of the water is reduced to the desired chilled water temperature.
D-2
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix D: Definitions
Firing Rate:
Flash Rusting:
Flashing:
Fossil Fuel:
Fuel to Steam
Efficiency:
Gloss Retention:
HAP:
HCFC:
Heat Exchanger:
Heat Pipe:
Heat transfer
coefficient:
HM:
HMCC:
Hogged-fuel Boilers:
Hot gas:
Humidity:
HVAC:
HVLP:
Infiltration:
Insulation:
Interruptible:
Kappa Factor:
Kilowatt (kW):
Kilowatt Hour:
Knots:
Lathe:
Lingnin Molecules:
As the load on a boiler varies, the amount of fuel supplied to the boiler varies in
order to match the load.
Occurs on some materials if water is allowed to sit on them, and can
contaminate coatings.
Pressurized condensate will change phase into steam if the pressure is suddenly
reduced.
Fuel (natural gas, coal, oil etc.) coming from the earth that was formed as a
result of decomposition of vegetation or animal matter.
A measure of the overall efficiency of a boiler. It accounts for radiation and
convection losses.
A measure of the amount of shine a paint maintains after time.
Hazardous Air Pollutant
Hydrochlorofluorocarbons
A device used to recover heat from one source and transfer this heat to another
source without mixing the two sources.
A counterflow air-to-air heat exchanger.
A parameter used in determining heat loss.
Hazardous Material
Hazardous Material Control Center.
A Boiler that burns waste materials for energy recovery.
The refrigerant vapor discharged by the compressor. This vapor is superheated;
the temperature of the vapor has been raised above that which normally occurs
at a particular pressure.
Water vapor within a given space.
Heating, ventilation and air conditioning.
High Volume, Low Pressure
Air flowing inward through a wall, window, door or a crack.
A material having a relatively high resistance to heat flow, principally used to
retard the flow of heat. This ability is measured as "R" factor. The higher the
factor the higher the ability to insulate.
Large users of electricity or gas who are able to turn off a portion of their use
during peak periods are rewarded by lower rates. The users interrupt their
service, thus the name interruptible service.
Is designated by the amount of chlorine in the first bleaching stage.
1000 Watts, unit of power.
Unit of electrical power consumption. It is one kilowatt used for one hour.
Undesired wood that where not properly pulped, including uncooked chips,
over thick chips, and irregularly sized pieces.
A piece of metal working equipment that holds a rapidly spinning work piece
for processing.
The waste produced throughout the pulping process.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
D-3
-------
Appendix D: Definitions
Notes
Load Shedding:
LP Gas:
Load Scheduling:
Lumen:
Makeready:
Make-up Air:
Mar Resistance:
Masking:
Material Balance:
MEK:
MLBK:
MSDS:
ODC:
ODS:
Optimum Start:
Paint Booth:
Photoprocessing
Chemicals
PMB:
POL:
Pollution Prevention:
Power (Watt):
Power Factor:
Presensitized Plates
Pressure (Volt):
Primer:
PVD:
Quantity (Coulomb):
A scheduled shutdown of equipment to conserve energy and reduce demand.
Liquid petroleum gas. This fuel is distributed in pressurized cylinders in liquid
state and by releasing it is converted into gas in which form it is burnt.
An internal clock programmed by the user to start and stop electric loads on
selected days at particular times.
A unit for quantitative measure of light.
The stage in printing operations when the plates are prepared and all
adjustments are made.
Air forced into the area equal to the air lost through exhaust vents.
A measure of the ability of a paint to withstand abrasions.
The covering of areas that are not to be subject to painting or paint removal.
Shows all the materials that enter and leave a process.
Methyl Ethyl Ketone
Methyl Isobutyl Ketone
Material Safety Data Sheets
Ozone Depleting Compound
Ozone Depleting Substances
The load scheduling program, when applied to heating or cooling loads, is
modified to follow temperature changes outside the building.
A specialized vented area set aside for painting.
Includes developer, fixer, and rinse water that are essential to developing
photos.
Plastic Media Blasting
Petroleum, Oil, Lubricant
Pollution prevention means "source reduction," as defined under the Pollution
Prevention Act, and other practices that reduce or eliminate the creation of
pollutants through:
• increased efficiency in the use of raw materials, energy, water, or other
resources, or
• protection of natural resources by conservation.
The watt is the power generated by a steady current of one ampere at a pressure
of one volt. The kilowatt (kW) = 1,000 watts. One horsepower = 746 watts.
Ratio between usable power supplied and usable power with inductive loads.
A type of plate used in printing and producing much less waste than typical
etched plates.
The volt, the pressure or potential difference required to produce one ampere in
a resistance of one ohm. 1 kilovolt (kV) = 1,000 volts.
Is a coating applied to prepare the substrate before the application of paint.
Physical Vapor Deposition
The quantity of electricity conveyed by one ampere flowing for one second.
Ampere hour, one ampere for one hour.
D-4
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix D: Definitions
Rancidity:
Ratchet:
Recuperator:
Recycling:
Regenerative Unit:
Residence Time:
R-value:
Savealls:
SCF:
Secondary Fiber:
Service Charge:
Sheet-fed Press:
Shell and Tube Heat
Exchanger:
Shop:
SOP:
Source Reduction:
Stack Gases:
Straight Oil:
Stratification:
Substrate:
Tails:
TCLP:
Is the odor produced by contaminated metal working fluids due to bacterial
growth.
The peak demand ratchet during a billing period is kept as the peak billing
demand for succeeding billing periods until either the ratchet is reset to zero or
a higher peak demand sets the ratchet to a higher peak value.
An air-to-air heat exchanger.
Recycling means the diversion of materials from the solid waste stream and the
beneficial use of such materials. Recycling is further defined as the process by
which materials otherwise destined for disposal are collected, reprocessed or
remanufactured, and reused.
A rotary air-to-air heat exchanger also known as a heat wheel.
The amount of time a part stays in a particular bath.
Measure of resistance to heat transfer in Btu/hr-ft -°F
A system used to recover fiber from the water used in pulp drying and paper
making operations.
Supercritical fluids undergo a phase transition from a gas or liquid phase to
become supercritical fluids.
Is fiber produced from recycled paper or paperboard that is combined with the
wood chips before pulping.
A fixed fee for providing service from a utility company.
A press that prints on single sheets of paper.
A liquid-to-liquid heat exchanger.
Area of operation, process line, and/or area which conducts the same type of
operation.
Standard Operation Procedures
Pollution Prevention Act defines "source reduction" to mean any practice that:
• reduces the amount of any hazardous substance, pollutant, or contaminant
entering any waste stream or otherwise released into the environment
(including fugitive emissions) prior to recycling, treatment, or disposal; and
• reduces the hazards to public health and the environment associated with
the release of such substances, pollutants, or contaminants
Under the Pollution Prevention Act, recycling, energy recovery, treatment and
disposal are not included within the definition of pollution prevention. Some
practices commonly described as "in-process recycling" may qualify as
pollution prevention.
Combustion gases that heat the water and are then exhausted out the stack.
A category of oil that includes all oils that are not water based.
An increasing air temperature gradient between the floor and the ceiling in an
enclosed area.
The material to be coated by any of the plating methods.
Streaks that appear in the extremities of paint.
Toxicity Characteristics Leaching Procedure.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
D-5
-------
Appendix D: Definitions
Notes
Terpenes:
Therm:
Thermal Efficiency:
Tramp Oils:
Treatment:
VOC:
Volt-Ampere:
Water Curtains:
Web-fed Press:
Wet-bulb
Temperature:
Wrap:
A categorization of semi-aqueous cleaners.
A measurement of heat, equivalent to 100,000 Btu.
A measure of effectiveness of the heat exchanger. It does not account for
radiation and convection losses.
Include all oils that contaminate an area or another fluid.
The processing of materials to concentrate pollutants, reduce toxicity, or reduce
the volume of waste materials. The most common example of this is
wastewater treatment.
Volatile Organic Compounds
The product of the rated load amperes and the rated range of regulation in
kilovolts (kVA).
Are utilized to minimize overspray and fumes in a thermal spray technology
process.
A press that prints on rolls of paper that are later cut to the appropriate size.
The temperature indicated by a thermometer for which the bulb is covered by a
film of water. As the film of water evaporates, the bulb is cooled. High wet-
bulb temperatures correspond to higher air saturation conditions. For example,
dry air has the ability to absorb more moisture than humid air resulting in a
lower, wet-bulb temperature.
The paint that coats the non-facing surfaces.
D-6
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix E: Energy Conservation Opportunity Case Studies
APPENDIX E
ENERGY CONSERVATION OPPORTUNITY CASE STUDIES
Information in this appendix discusses specific energy conservation opportunities in detail.
This is done to illustrate how to calculate energy savings and cost savings for various opportunities. The
assessment team should evaluate carefully, the specifics of the facility or operation being assessed to
determine if the measures presented here can be implemented. The team should also evaluate the opportunity
using facility specific information. The following case studies present only a few of the available energy
conservation opportunities.
1. Implement Periodic Inspection and Adjustment of Combustion in a Natural Gas Fired Boiler
2. Implement Periodic Inspection and Adjustment of Combustion in an Oil Fired Boiler
3. Energy Savings from Installation of Ceiling Fans
4. Install Infrared Radiant Heaters
5. Repair Compressed Air Leaks
6. Install Low Pressure Blowers to Reduce Compressed Air Use
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
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Appendix E: Energy Conservation Opportunity Case Studies
CASE STUDY #1: IMPLEMENT PERIODIC INSPECTION AND ADJUSTMENT
OF COMBUSTION IN A NATURAL GAS FIRED BOILER
Current Practice and Observations
During the audit, the exhaust from the boilers was analyzed. This analysis revealed excess oxygen
levels which results in unnecessary energy consumption.
Recommended Action
Many factors including environmental considerations, cleanliness, quality of fuel, etc. contribute to
the efficient combustion of fuels in boilers. It is therefore necessary to carefully monitor the performance of
boilers and tune the air/fuel ratio quite often. Best performance is obtained by the installation of an automatic
oxygen trim system that will automatically adjust the combustion to changing conditions. With the relatively
modest amounts spent last year on fuel for these boilers, the expense of a trim system on each boiler could not
be justified. However, it is recommended that the portable flue gas analyzer be used in a rigorous program of
weekly boiler inspection and adjustment for the two boilers used in this plant.
Anticipated Savings
The optimum amount of O2 in the flue gas of a natural gas-fired boiler is 2.0%, which corresponds to
10% excess air as shown in Exhibit E.I. Measurements taken from the stack on the 300 HP boiler gave a
temperature of 400°F and a percentage of oxygen at 6.2%. By controlling combustion the lean mixture could
be brought to 10% excess air or an excess O2 level of 2%. This could provide a possible fuel savings of 3%.
The 300 HP natural gas boiler is used both for production and heating. It is estimated that 100% of
the natural gas is consumed in the boiler.
Therefore the total savings would be:
Savings in Fuel (therms/yr.) = (% burned in boiler) x (annual therms/yr.) x (% possible fuel savings)
= 1.0 x (56,787 therms/yr) x (0.02)
= 1,136 therms/yr
Savings in Dollars ($/yr): = (therms Saved/yr) x (cost/therm)
= 1,136 therms/yr x $0.644/therm
= $732/yr
Implementation
It is recommended that the facility purchase a portable flue gas analyzer and institute a program of
monthly boiler inspection and adjustment of the boilers used in the plant. The cost of such an analyzer is
about $500 and the inspection and the current maintenance personnel could perform the burner adjustment.
The simple payback is:
$500 cost / $732 = 8.2 months
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
Notes
on
28
26
24
22
20
18
is
|0
M
12
10
8
6
4
2
0
Exhibit E.I: Natural Gas Fuel Savings1
% EXCESS A1H
z
7
1 200
/
1 000
800
600
0
20
in
X
40 m
t/>
in
60
80
4 6 8
OXYGEN IN FLUE GAS - %
100
12
Note: Fuel savings determined by these curves reflect the following approximation. The
improvement in efficiency of radiant and combination radiant and convective heaters or boilers without air
pre-heaters that can be realized by reducing excess air is 1.5 times the apparent efficiency improvement from
air reduction alone due to the accompanying decrease in flue gas temperature.
As an example, for a stack temperature of 600°F and C>2 in flue gas of 6%, the fuel saving would be
3%. If desired, excess air may be determined as being 36%.
E-4
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Appendix E: Energy Conservation Opportunity Case Studies
CASE STUDY #2: IMPLEMENT PERIODIC INSPECTION AND ADJUSTMENT
OF COMBUSTION IN AN OIL FIRED BOILER
Current Practice and Observations
During an audit, flue gas samples were taken from the boiler. The boiler was operating with too
much excess air resulting in unnecessary fuel consumption.
Recommended Action
Many factors including environmental considerations, cleanliness, quality of fuel, etc. contribute to
the efficient combustion of fuels in boilers. It is therefore necessary to carefully monitor the performance of
boilers and tune the air/fuel ratio quite often. Best performance is obtained by the installation of an automatic
oxygen trim system that will automatically adjust the combustion to changing conditions. With the relatively
modest amounts spent last year on fuel for these boilers, the expense of a trim system on each boiler could not
be justified. However, it is recommended that the portable flue gas analyzer be used in a rigorous program of
weekly boiler inspection and adjustment for the two boilers used in this plant.
Anticipated Savings
The optimum amount of O2 in the flue gas of an fuel oil-fired boiler is 3.7%, which corresponds to
20% excess air. The boiler measured had an Q level of 8.5 % and a stack temperature of 400°F. From
Exhibit E.2, using the measured stack temperature and excess oxygen for the boiler indicates a possible fuel
saving of nearly 4.0% for the oil fired boiler.
It is assumed that the boiler uses all of the fuel oil consumed during the year. The possible savings
are then the sum of the products of amount used and percent saved.
Energy Savings = (10,339 gallons/yr.) x (0.04 savings.) = 414 gallons/yr.
Therefore the total cost savings would be:
Cost Savings = (414 gallons/yr.) x ($1.03/gallon) = $426/yr
Total Annual Savings = $426
Implementation
It is recommended that you purchase a portable flue gas analyzer and institute a program of monthly
boiler inspection and adjustment of the boilers used in the plant. The cost of such an analyzer is about $500
and the inspection and the current maintenance personnel could perform the burner adjustment. The simple
payback period will then be:
$500 implementation cost / $426 savings/yr. = 1.2 years
Simple payback=1.2 yrs.
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
Notes
s
30
2%
2fj
24
20
t/3
C
Si 12
10
8
fi
4
Exhibit E.2: Liquid Petroleum Fuel Savings1
v>
X
I
/ 1200
/1
1 000
/
800
XftOO
\
40 n
60
80
10
4 6 S 1
IN GAS - %
Note: Fuel savings determined by these curves reflect the following approximation. The
improvement in efficiency of radiant and combination radiant and convective heaters or boilers without air
pre -heaters that can be realized by reducing excess air is 1.5 times the apparent efficiency improvement from
air reduction. This is due to the decrease in flue gas temperature that must follow increased air input.
As an example, for a stack temperature of 800°F and
3%. If desired, excess air may be determined as being 36%.
in flue gas of 6%, the fuel savings would be
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Appendix E: Energy Conservation Opportunity Case Studies
CASE STUDY #3: ENERGY SAVING FROM INSTALLATION OF CEILING
FANS
In calculating the energy and cost savings of this implementation it is first necessary to calculate the
Energy Savings of the fans (E S,F).
}/EFF
where
U = heat transfer coefficient
A = area
DHAT = annual heating degree hours at current average temperature
DHcT = annual heating degree hours at ceiling temperature
DHpi = annual heating degree hours at proposed mixed temperature
EFF = efficiency of the heating system
subscripts
W = of the walls, windows, and doors
I = of the infiltration
C = of ceiling/roof
The amount of additional energy consumed by the destratification fans is given by
EDF = Number of Fans x W x OH
where
W= wattage of each fan
OH = operating hours during the heating season
The total annual energy savings (ES) can now be found by
ES =ES,F - EDF
Using this information, it is simple to calculate the annual cost savings (CS) of this implementation.
CS = (Es,px Fuel Cost) - (Erip x Fuel Cost)
Finally a simple payback can be found using
Payback = Number of Fans (Cost per Fan Installation Cost)
CS
A case study for one plant yielded a potential energy savings of 307.59 MMBtu/yr with cost savings
of $1,643.20. This measure, which involved 19 fans, had an implementation cost of $3,420. The suggested
fan type was the 60" model, estimated to cover about 2,150 ft2, with a price of approximately $90 per unit and
an installation cost of $90, resulting in a total of $180 per fan. The simple payback period was 2.08 years.
The typical payback period for the installation of destratification fans is approximately 2 years.
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
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Appendix E: Energy Conservation Opportunity Case Studies
CASE STUDY #4: INSTALL INFRARED RADIANT HEATERS
In calculating the energy and cost savings for using infrared radiant heaters the method differs
according to the application of the system.
Comfort Heating
For the radiant comfort heating system, the rrethod is quite simple. First calculate the amount of
energy (ERH) consumed by the infrared units.
ERH = HL x Number of Units x PR x OH
Where
HL = average heating load
PR = total power rating of each unit
OH = operating hours per year
Next, an estimate of the current energy usage for the convective heaters (Ecn) must be made. Then
taking the difference in these two values, the total annual energy savings can be determined.
ES = ECH - ERH
Multiplying this number by the cost of fuel yields the total cost savings for the year.
CS = ES x Fuel Cost
Or an alternate method for computing these savings is simply
Effc
EffR
ES = Current Us age x | 1 •
and
CS = ES x Fuel Cost
where
EFFc = efficiency of the convective system
EFFR = efficiency of the radiant system
Note that although this evaluation is generally valid, these savings are based on the efficiency of the
systems, where in most cases the savings are determined by the cost of the fuel. This is especially true in the
case where different energy sources are being considered, i.e. natural gas or electricity.
One study estimated a current energy use of 5,000 x 10 6 Btu/yr. Installation of 18 radiant heaters
yielded an energy savings of 2,786 x 10 6 Btu/yr. and a cost savings of $10,406/yr. The implementation cost
including piping and labor came to a total of $28,960 resulting in a payback period of 2.8 years.
Process heating
To find the savings for replacing a process unit with an infrared system, many more factors must be
taken into account. For example, one case study involved replacing process ovens with infrared burners. The
ovens were used to heat molds that in turn, baked cones. The first step in this savings estimation was to
calculate the efficiency of the current ovens. This was accomplished by estimating the amount of energy (Ec)
used to heat the product per year.
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
Notes Ec=BSxBxOHxpv + Cpx(Tf-TI)]
where
BS = average batch size
B = # of batches per hour
OH = operating hours per year
Hv = heat of vaporization of water (assuming batch is 100% water)
Cp = specific heat of water
Tf = final temperature of cone
Tj = initial temperature of batter
Once the total amount of energy consumed by the ovens (Eo) is obtained, the overall oven efficiency
can be determined by
E
EFFC =—-
The heat transfer rates for the new and the old system were then found and compared. The
convective heat transfer rate in the blue flame mode was approximated to be around 1.0 Btu/hr-ft2 -deg. F
based on the characteristics of the current ovens. The radiant heat transfer rate (UR) was found by using the
following equation.
__ „ T*-T\ _. , BBtu
1.3-
Tg-Tm hrft2°F
where
F = radiation shape factor
a = absorptivity of the mold
a = Boltzmann's constant
TI = radiant heater surface temperature
T2 = mold surface temperature
Tg = gas temperature in the oven
Tm = mold temperature
Comparing these rates, UR was found to be 30% larger than Uc, the convective coefficient. If there
are 30% savings, the energy savings would be
ES = Total Gas used by Ovens x Percent Savings
and the cost savings
CS = ES x Cost of Natural Gas
Calculating the payback is simply
Payback = Implementation Costs / CS
where the implementation costs include equipment and installation.
H. 10 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix E: Energy Conservation Opportunity Case Studies
The results of this study showed that there was a total energy savings of 5,440 MMBtu/yr and a total
cost savings of $31,280/yr. For estimation purposes, it was assumed that 65% of the total gas use was
consumed in order to obtain these approximations. The cost of implementation for each oven was $10,500.
For all nine ovens the total implementation cost was $94,500. This data yields a payback period of 3.0 years.
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
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Appendix E: Energy Conservation Opportunity Case Studies
CASE STUDY #5: REPAIR COMPRESSED AIR LEAKS
Background
The cost of compressed air leaks is the energy cost to compress the volume of lost air from
atmospheric pressure to the compressor operating pressure. The amount of lost air depends on the line
pressure, the compressed air temperature at the point of the leak, the air temperature at the compressor inlet,
and the estimated area of the leak. The leak area is based mainly upon sound and feeling the airflow from the
leak. The detailed equations are given in Chapter 8. An alternative method to determine total losses due to air
leaks is to measure the time between compressor cycles when all air operated equipment is shut off.
The plant utilizes one 75 hp compressor that operates 8,520 hrs/yr. Measurements taken during the
site visit showed the compressor to continuously draw 77.7 hp. Approximately 24% of this load is lost to air
leaks in the plant. The majority of the air leaks are due to open, unused lines. There are several plant
locations where pneumatic machinery could be connected to the primary air line, but at the time of the site
visit, no machines were connected. These open lines were typically found on or near I-beams. The terms "I--
beam #1, #2, and #3" are used in the Exhibits of this opportunity to label the leaks. In order to allow for
correct location of these open lines, a list of the terms and their approximate locations are given below:
Terms Description
I-Beam #1 Leak located on I-beam near rotary automatic #2.
I-Beam #2 Leak located on I-beam near catalogue machine.
I-Beam #3 Leak located on hose attached to I-beam near Machine 6700.
Recommended Action
Leaks in compressed air lines should be repaired on a regular basis.
Anticipated Savings
Values for all factors affecting the cost of compressed air leaks were determined during the site visit,
and are listed in Exhibits E.3. Because of long piping runs to the equipment, the compressed air temperature
is estimated to be the same as room temperature.
Exhibit E.3: Condition of Pneumatic System at Time of Site Visit
Variable
Air temperature at compressor inlet, F
Atmospheric pressure, psia
Compressor operating pressure, psig
Air temperature at the leak, F
Line pressure at the leak, psig
Compressor motor size, hp
Compressor motor efficiency
Compressor type
Number of stages
Compressor operating hours, per year
Electric cost, per MMBtu
92
14.7
115
72
115
75
91.5%
Screw
1
8,520
$14.05
Notes
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E-13
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Appendix E: Energy Conservation Opportunity Case Studies
Notes
Using these values, the volumetric flow rate, power lost due to leaks, energy lost and cost for leaks
of various sizes were calculated specifically for the conditions at this plant. The results are shown in Exhibit
E.4.
As Exhibit E.4 shows, the cost of compressed air leaks increases exponentially as the size of the leak
increases. As part of a continuing program to fnd and repair compressed air leaks, the Exhibit can be
referenced to estimate the cost of any leaks that might be found.
Exhibit E.4: Cost of Compressed Air Leaks At This Plant
Hole
Diameter
1/64
1/32
1/16
1/8
3/16
1/4
3/8
Flow
Rate
cfm
0.5
1.8
7.2
29.0
65.2
115.8
260.6
Power
Loss
hp
0.1
0.4
1.7
6.9
15.4
27.4
61.7
Energy
Lost
MMBty/yr
0.2
8.7
36.9
149.7
334.1
594.4
1,334.8
Energy
Cost per
year
$31
$122
$518
$2,103
$4,694
$8,351
$18,805
The estimated energy savings and corresponding cost savings for the air leaks found during the site
visit are listed in Exhibit E.5 below:
Exhibit E.5: Summary of Savings
Machine
Cardboard Boxes Area
Cardboard Boxes Area
Hand Dye
Straight Knife
Web
I-beam#l
I-beam#2
I-beam#3
TOTALS
Leak
Diameter
in
1/16
1/16
1/16
1/8
1/16
1/16
1/16
1/16
Power
Loss
hp
1.7
1.7
1.7
6.9
1.7
1.7
1.7
1.7
18.8
Energy Savings
MMBtu/yr
36.9
36.9
36.9
149.7
36.9
36.9
36.9
36.9
408.0
Cost Savings
peryear
$518
$518
$518
$2,103
$518
$518
$518
$518
$5,729
From Exhibit E.5 above, lie total estimated energy savings from repairing the air leaks are 408.0
MMBtu./yr. and the total cost savings are $5,730/yr.
E-14
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Appendix E: Energy Conservation Opportunity Case Studies
Implementation Costs
In general, implementation of this opportunity involves any or all of the following:
1. Replacement of couplings and/or hoses;
2. Replacement of seals around filters;
3. Shutting off air flow during lunch or break periods; and
4. Repairing breaks in lines, etc.
Specific repairs and implementation costs for the leaks found during the site visit are given in
Exhibit E.6 below.
Exhibit E.6: Implementation Costs
Machine
Cardboard Box Area
Cardboard Box Area
Hand Dye
Straight Knife
Web
I-beam#l
I-beam#2
I-beam #3
TOTALS
Repair Needed
Install shut-off valve
Install shut-off valve
Install shut-off valve
Replace coupling
Change 0.5"tube
Install shut-off valve
Install shut-off valve
Replace coupling
Parts
$50
$50
$50
$2
$9
$50
$50
$2
$263
Labor
$25
$25
$25
$25
$25
$25
$25
$25
$200
Total Cost
$75
$75
$75
$27
$34
$75
$75
$25
$463
Assuming that facility maintenance personnel can do this work, these leaks can be eliminated for
approximately $460. Thus, the cost savings of $5,730 would pay for the implementation cost of $460 in
about 1 month.
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
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Appendix E: Energy Conservation Opportunity Case Studies
CASE STUDY #6: INSTALL A LOW PRESSURE BLOWER TO REDUCE
COMPRESSED AIR USE
Estimated Energy Savings = 428.7 MMBtu/y.r
Estimated Cost Savings = $5, 720/yr.
Estimated Implementation Cost = $8,500
Simple Payback = 18 months
Recommended Action
A low-pressure blower should be installed to provide agitation air for 3 plating tanks. Use of low-
pressure air from a blower, as compared to use of compressed air, would reduce electrical consumption by
eliminating the current practice of compressing air and the expanding it back to the lower pressure.
Background
A 100 hp compressor is currently in use at this facility, and a significant amount of the power
consumed by the compressor (31%) is used to provide air to agitate 3 plating tanks. This compressor
produces compressed air at 1 17 psig, but less pressure is actually needed to provide effective agitation. The
pressure and flow rate requirements for effective agitation are calculated from the following equations:
Q=AFxA
and
Pa = (0.45 xS£>xSG) + 0.75
where
Q = flow rate required for agitation, cfm
AF = agitation factor
A = surface area of agitation tanks, 63.5 sq. ft.
Pa= pressure required for agitation, psig
SD = depth of solution, 3 ft.
SG = specific gravity of water, 1.0
For agitation tanks containing water, the agitation factor is 1.0 cfm/sq. ft. The effective surface
area of the tanks is 63.5 sq. ft. Thus, the flow rate required for agitation is calculated as follows:
g = 1.0x63.5 = 63.5c/7H
The pressure required for effective tank agitation is calculated as follows:
JP = 0.43x3.0xl.Ox0.75 =
Because of the difference between the pressure delivered by the compressor and the pressure
required for effective tank agitation, the compressor is doing a large amount of unnecessary work. By
implementing a blower that has a pressure output more closely matched to the agitation requirement,
significant energy savings can be realized.
Notes
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Appendix E: Energy Conservation Opportunity Case Studies
Notes
Anticipated Savings
Energy savings due to use of air at reduced pressure, ES, are estimated as follows1:
ES = (PC-PB)xHxCl
where
PC = power consumed by compressor to agitate tank, hp
PB = power consumed by blower to agitate tank, hp
H = operating hours, 5,746 h/yr
GI= conversion factor, 0.756 kW/hp
The volume of free air used for agitation V f at this plant as obtained from the plant personnel is 130
cfm. The power PC that is required to compress the volume of free air Y needed for agitation from
atmospheric pressure to the compressor discharge pressure can be calculated as follows :
PC =
k
1 2 J k-\ j
k-\
( P '\kxN
\ ° \ 1
UJ
E xE
where
P = inlet (atmospheric pressure), 14.7 psia
C2= conversion constant, 144 in 2 /ft
Vf= volumetric flow rate of free air, 130 cfm
k = specific heat ration of air, 1.4 (no units)
N = number of stages, 1 stage
GS = conversion constant, 3.03 x 10-5 hp-min/ft-lb
P0 = pressure at the compressor outlet, 131.7 psia (117 psig)
EaC = air compressor isentropic (adiabatic) efficiency, 82%
EaC = 0.88 for single stage reciprocating compressors
EaC = 0.75 for multi-stage reciprocating compressors
EaC = 0.82 for rotary screw compressors
Eac = 0.72 for sliding vane compressors
EjC = 0.80 for single stage centrifugal compressors
EjC = 0.70 for multi-stage centrifugal compressors
Emc = compressor motor efficiency, 92% for a 100 hp motor
Thus, the power that is currently consumed by the compressor to provide air for tank agitation is
calculated as follows:
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Appendix E: Energy Conservation Opportunity Case Studies
14.7 x!44 x 130 x—x 1 x (s.03 x 1(T5)>
0.4
PC=-
0.4
14.7
-1
0.82 x 0.92
Similarly the power required by the blower to provide the same amount of air for agitation, PB, can
be calculated as follows:
Pt x C9 x O x x TV x Co x
k-\
PB=-
where
Pb = pressure at the blower outlet, 17.7 psia (3 psig). This value accounts for Pa plus
losses in the air lines.
Eab = blower isentropic (adiabatic) efficiency, 60%
Ejb = 0.70 for turbo blowers
Eab= 0.62 for Roots blowers1
Emb = compressor motor efficiency, 92% for a 100 hp motor
Thus, the power that would be consumed by the blower to provide air for tank agitation is estimated as
follows:
0.4
14.7 x 144 x 130 x —— x 1 x (3.03 x 10~5 )x
0.4 V 7
PB = -
0.60x0.80
For this facility, the energy savings, ES, that can be realized by installing a blower to provide
agitation air for the three tanks are estimated as follows:
S = (33.7-1.6)x5746x0.746 =137,59
yr
The annual cost savings, CS, can be estimated as follows:
CS = ES x unit cost of elecricity
„„ (.,QnMMBtu\ ( $13.34 ^ ,.„<:«,
CS =\ 469.7 x = 6,265 $ /
^ yr ) \MMBtu)
yr
Implementation Cost
Implementation of this opportunity involves purchase and installation of a low pressure blower and
corresponding controls. The purchase price for a blower that will provide 3 psig air at a flow of 63.5 cfm,
including controls, is estimated as $7,500. The installation cost is estimated as $1,000, including
Notes
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E-19
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Appendix E: Energy Conservation Opportunity Case Studies
Notes
modifications to tanks described below, giving a total implementation cost of $8,500. Thus, the cost savings
of $5,720/yr. would have a simple payback of about 18 months.
In order for a 3 psig blower to deliver 63.5 cfm of air, the size of the air outlets in the tanks may
have to be modified. Assuming that there are 12 total outlets (4 outlets per tank), the required outlet diameter
is calculated from the equation for unchoked flow (less than the speed of sound) as follows:
D =
4 x Q x fti + 460
where
NLxC5 xC6 xC7 xCdb X7rx(r/ +460)x1||-2-' * ' '
-* j
T = average line temperature, °F
NL = number of outlets used for agitation, 12
C5 = conversion constant, 60 sec/min
C6 = conversion constant, 1/144 in 2 /ft 2
C7= isentropic subsonic volumetric flow constant, 109.61 ft/sec-°R0.5
Cdb = coefficient of discharge for subsonic flow through a square edged orifice, 0.6
p = Pythagorean constant, 3 . 1 4 1 592
Tj = temperature of the air at the compressor inlet, 101°F
PI = line pressure at the agitation tanks, 17.7 psia
Thus, the required diameter of the air outlets is calculated as follows:
D =
4x63.5xV75+460
enlarged.
12x60x —x 109.61x0.6 X7rx(l01 +460)
144 V '
Therefore, if the current diameter of the air outlets is not equal to 0.20 inches, the outlets should be
2x0.4
17.71 1.4
0.4
17.711-4
1. From Serfilco'91-'92 Catalog "U" p. 118.
2. Compressed Air and Gas Handbook, 1961.
3. Chapters 10 and 11, Compressed Air and Gas Handbook, Fifth Edition, Compressed Air and Gas
Institute, New Jersey, 1989.
E-20
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Appendix F: Pollution Prevention Opportunity Case Studies
APPENDIX F
POLLUTION PREVENTION OPPORTUNITY CASE STUDIES
Information in this appendix discusses specific pollution prevention opportunities. This is done to
illustrate how to calculate waste reduction and cost savings for various opportunities. The assessment team
should evaluate carefully, the specifics of the facility or operation being assessed to determine if the measures
presented here can be implemented. The team should also evaluate the opportunity using facility specific
information. The following case studies present a few of the available pollution prevention opportunities.
1. Construction and Demolition Waste Recycling
2. Packaging Reuse
3. Oil Analysis Program
4. Maintenance Fluid Recycling
5. Metal Working Fluid Substitution
6. Use of Automated Aqueous Cleaner
7. Recycling of Cleaner Through Filtration
8. Proper Rinsing Set-Up for Chemical Etching
9. Waste Reduction in the Chromate Conversion Process
10. Plating Process Bath Maintenance
11. Closed-Loop Plating Bath Recycling Process
12. Water-Borne Paint as a Substitute for Solvent-Based Coatings
13. High Velocity Low Pressure (HVLP) Paint System
14. Replacing Chemical Stripping with Plastic Media Blasting
15. White Water and Fiber Reuse in Pulp and Paper Manufacturing
16. Chemical Substitution in Pulp and Paper Manufacturing
17. On - Site Ink Recy cling
18. Solvent Reduction in Commercial Printing Industry
Notes
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CASE STUDY #1: CONSTRUCTION AND DEMOLITION WASTE RECYCLING
Current Practice and Observations
An operator in California owns a one-story fenced off wood frame building with floor dimensions of
approximately 60' x 135' that is slated for demolition. It was constructed in 1942 as a "temporary" structure.
The building served as a warehouse with office space added to a portion of the interior at a later date. The
building was constructed almost entirely of wood, with wood siding, wood flooring on concrete supports, and
wood slat roofing boards covered with a recent re-roof of asphalt shingles.
Recommended Action
Utilize a deconstruction and salvaging company to dismantle the building to salvage and sell the
wood and other construction materials. Separate materials by type, size and quality within the premise of the
fence, and utilize the area as an ad-hoc lumberyard. Advertise the lumber as old growth, in order to receive
the most money for it.
Anticipated Savings
Exhibit F.I presents the economic analysis of the recommended action.
Exhibit F. 1: Cost Analysis for a Demolition Waste Recycling Program
Item
Equipment and Hauling
On-Site Labor
Administrative
TOTAL
Items
On-Site Wood Sale
National Park Service Grant
Lumber Sold Off-Site
Greater Demolition Contract Give -Back
TOTAL
Net Profit ($75,455 - $57,640)
Costs
$11,983
$33,053
$12,604
$57,640
Savings
$30,155
$15,000*
$13,500
$16,800**
$75,455
$17,815
* Grant was provided by the National Parks Service to foster the hand deconstruction project and help
develop future projects of this kind.
** This was the savings estimated by the contractor for not having to demolish the building.
Implementation
The deconstruction and salvaging company was able to recover approximately 87 percent of the
wood contained within the building. The other 13 percent of the wood was found to be unusable or degraded
to recycling quality during the dismantling of the building. The surrounding fenced-off area served as a
lumberyard, which enabled the crew to sort and stack materials according to size and type. This fostered the
on-site sale of over half the lumber recovered from the building. Beyond generating immediate revenues and
allowing the community to purchase desirable materials, it reduced shipping costs. The price of the wood
ranged between $0.25 per board foot for roof planking to $1.50 per board foot for the douglas fir flooring.
Notes
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Appendix F: Pollution Prevention Opportunity Case Studies
JT , The majority of the wood sold for around $1.00 per board foot. The entire deconstruction took four weeks,
and left a cleaned vacant lot.
This case study was adapted from: "Presidio of San Francisco, Building 901. " Construction and
Demolition Recycling Program, http://www.ciwmb.ca.gov/mrt/cnstdemo/casestud/presido/case2.htm.
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #2: PACKAGING REUSE
Current Practice and Observations
Before early 1990, most of a Michigan based retailers 17 facilities used polystyrene "peanuts" as
packaging material to ship merchandise to its customers. Although the "peanuts" effectively protected many
fragile items during shipping, some customers viewed the poly styrene packaging material as environmental
unsound.
Recommended Action
Purchase a large durable paper shedder for each of the 17 facilities. Shred office paper waste at each
facility for packaging.
Exhibit F.2 below presents the economic comparison of the current operation to the recommended
action.
Exhibit F.2: Monthly Operating Cost Comparison for Polystyrene Packaging Peanuts and Shredded
Paper Packaging
Purchased Packaging Costs:
Equipment and Supplies
Amortized Costs:
Labor Costs:
Utility Costs:
Total Costs:
Polystyrene Peanuts
$3,340
$0
$0
$23
$3,363
Shredded Paper
$0
$0
$1,694
$27
$1,901
Total Savings: $1,462 per month
Implementation
The retailer implemented a plan in which the paper is collected from all stores, shredded, and is sent
to a central warehouse where it is redistributed to individual facilities. Shredding dramatically lowered
packaging costs by approximately 43 percent, and has saved the retailer approximately $17,500 each year. In
an effort to generate additional revenue, plans are to shred and sell approximately 27 percent more office
paper than is needed. The excess shredded material, if sold at a price equivalent to what was previously paid
for shredded packaging material, could generate as much as $10,900 more.
This case study was adapted from: "Case Study: Hudson 's Department Stores Outfit Themselves with Waste
Reduction. " Enviro$ense. http://es.epa.gov/techinfo/case/michigan/mich-cs3.html.
Notes
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CASE STUDY #3: OIL ANALYSIS PROGRAM
Current Practice and Observations
At a facility in New Jersey various shops, including the main garage, change the oil in equipment
and fleet vehicles. Oil changes are preformed according to strict maintenance schedules rather than on an as
needed basis. Many machines and vehicles have the oil changed four times a year.
Recommended Action
Purchase and install oil analysis equipment at the main garage. Evaluate oil quality including
viscosity, total base number (a measure of the oil's ability to neutralize acids), and the concentration of some
metal ions (e.g., calcium, magnesium, phosphorus, sodium, and zinc). Only change oil when tests indicate
that it is needed. Other facility shops should send their oil samples to the main garage for testing before
performing routine service work.
Anticipated Savings
Changing the oil is a time, labor, and costly process, therefore reducing the number of times oil is
changed can drastically reduce costs as well as environmental impact. The following economic comparison is
made on a conservative set of assumptions. These assumptions are listed below.
• 20 drums of oil a year are used with the old system.
• Oil is $200 per drum.
• Oil analysis equipment will reduce oil change frequency by 50 percent.
• 1 PC-based unit will be purchased to analyze the oil.
• 65 filters are changed per year with the old system.
• Oil disposal costs $0.22 per pound.
• Filter disposal costs $0.58 per pound.
Exhibit F.3 presents an economic comparison of the current operations to the recommended action.
Exhibit F.3: Economic Comparison of Maintenance Schedule versus Oil Analysis Programs
Annual Cost of Current
Practice:
Materials:
Oil:
Filters:
$4,000
$1,560
Disposal:
Oil Disposal:
Filter Disposal:
TOTAL:
$2,057
$151
$7,768
Capital Project Costs:
Materials:
Equipment: $8,795
TOTAL: $8,795
Annual Project
Costs:
Materials:
Oil:
Filters:
$2,000
$780
Disposal:
Oil Disposal:
Filter Disposal:
TOTAL:
$1,029
$75
$3,884
Notes
Expected Annual Savings: $3,884
Estimated Payback Period: 2.2 years
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Pollution Prevention Opportunity Case Studies
Notes Implementation
The oil analysis equipment saved the facility thousands of dollars, and paid for itself in under two
and a half years. The equipment significantly decreased the volume of oil and number of filters purchased,
oil waste, oil filter waste, and their related costs.
This case study was adapted from: "Pollution Prevention Plan." U.S. Coast Guard Training
Center, Cape May, New Jersey, 1997.
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #4: MAINTENANCE FLUID RECYCLING
Current Practice and Observation
A maintenance garage at a facility scheduled and performed all regular maintenance on facility
machines and vehicles. The garage produced large quantities of lacquer thinners, degreasers, carburetor
cleaners, gasoline, and waste oil. The majority of the wastes entered the waste stream and was disposed of in
landfills or as hazardous waste.
Recommended Action
Contact an outside contractor to pick-up and recycle waste solvents. The waste solvents should be
recycled using distillation, filtration, and blending to produce reusable products
Anticipated Savings
Exhibit F.4 presents an economic comparison of the current operation to the recommended action.
Exhibit F.4: Annual Operating Cost Comparison for Waste Solvent Disposal and Waste Solvent
Recycling
Disposal Charge
Program Fee
Chemical Re -sale
TOTAL
Disposal
$4,200/year
$4,200/year
Recycling
$2,450/year
-$l,050/year
$l,400/year
Total Estimated Annual Savings ($4,200 - $1,400): $2,800 per year
Notes
Implementation
With the implementation of a waste solvent recycling program the maintenance garage realized a
reduction in cost and environmental impact. The program recycled 88,000 gallons of solvent/sludge material
and 265,000 gallons of waste oil in the first year. In addition, the garage met all federal and state regulations
with the program. This program would not have been possible with out a local waste solvent recycler already
in place.
This case study was adapted from: "Auto Dealers Cooperate in Solvent and Waste Oil Recycling Program "
Enviro$ense. http://es.epa.gov/studies/htll0011.html.
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CASE STUDY #5: METAL WORKING FLUID SUBSTITUTION
Current Practice and Observations
A Swedish fixture manufacture utilized a mineral oil-based cutting oil for metalworking, a
trichloroethylene solvent for degreasing, and a solvent-based paint for finishing parts. The metalworker
produced 400,000 pieces per year, and was concerned about complying with air pollution standards in the
future. The manufacturer was also looking for ways to reduce costs.
Recommended Action
Substitute a vegetable oil based metalworking fluid for the mineral-based oil.
Anticipated Savings
A reduction in metalworking fluid costs of $5,000 per year was estimated. Since no extra equipment
is necessary for the substitution, there should not be any capital costs and the payback should begin
immediate.
Implementation
The manufacturer found that the substitution of the vegetable oil-based cutting lubricant decreased
mineral solvent vapor by 30 tons. The substitution also allowed changes to be made in the degreasing and
finishing of the product. The environmentally detrimental degreaser was replaced with an alkaline detergent
solution, and a powder-coating system was implemented for finishing. These additional changes significantly
decreased emissions and saved $415,800 per year with a capital investment of $383,00.
This case study was adapted from: "Substitution of metalworking Fluid Promotes Less Need for
Organic Solvent. " Enviro$ense. http://es.epa.gov/studies/cs457.html.
Notes
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CASE STUDY #6: INSTALL AN AUTOMATED AQUEOUS CLEANER
Current Practices and Observations
A medium-sized metal finishing company in Connecticut used vapor degreasing, alkaline tumbling,
and hand-aqueous washing methods to prepare its products for the plating process. The plant wanted to
expand capacity without increasing solvent consumption.
Recommended Action
Install an automated aqueous cleaner to accommodate the growth in production, but leave the vapor
degreasing, alkaline tumbling, and hand-aqueous washing equipment in place. Treat the small increase in
wastewater generated by the automated cleaner with the existing wastewater treatment plant.
Anticipated Savings
Exhibit F.5 shows the anticipated reduction in waste generation for the metal finishing company.
Exhibit F.5: Waste Volume Reduction by Using the Automated Aqueous Washer
Conventional Cleaning Waste
Stream
Vapor Degreasing3
Wastewater in separator
Still bottom in sludge
Alkaline Tumbling b
Wastewater
Hand-Aqueous Washing c
Wastewater
Volume
Generated
(gal/yr.)
200
1,400
1,010,880
296,400
Automated Washing
Stream
Automated Washing3
Wastewater
Oily Liquid
Automated Washing b
Wastewater
Oily Liquid
Automated Washing0
Wastewater
Oily Liquid
Waste Volume
Generated
(gal/yr.)
143,000
962
85,800
577
57,200
385
"Based on 5,200 barrels/yr. run on automated -washer instead of vapor degreaser.
bBased on 3,120 barrels/yr. run on automated washer instead of alkaline tumbler.
°Basedon 2,080 barrels/yr. run on automated-washer instead of had-aqueous-washer.
Implementation
The automated cleaner is utilized for most of the new work, and has been found to use 90 percent
less water compared with alkaline tumbling, and 80 percent less when compared to hand aqueous washing.
Because the cleaning solutions are recovered and reused in the automated washer, consumption of cleaning
chemicals (and their losses through wastewater) were 40 percent lower than the alkaline soaking process and
95 percent lower than hand-aqueous washing. Some special jobs are still run through the old process. For
example, delicate parts and hard to clean pieces are run through the old system. By installing an automated
aqueous washer instead of a vapor degreaser or a traditional aqueous process an annual savings of $60,000
was realized. With a capital cost of $200,000, the initial investment was recovered in under three and a half
years.
Notes
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Appendix F: Pollution Prevention Opportunity Case Studies
JT , This case study was adapted from: "Guide to Cleaner Technologies: Cleaning and De greasing
ental Protection Agency, Office of Research and Development, 1994.
EPA/625/R-93/017.
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #7: RECYCLING OF CLEANER THROUGH FILTRATION
Current Practice and Observations
In 1984, a chassis designer and manufacturer was producing 470,000 automotive frames, 90,000
axle housings and 250,000 van extensions. The die-cut and stamped metal chassis were produced for the
automotive industry. Prior to stamping, the parts were coated with an oil-based forming compound. Once
the stamping was completed, the parts were washed in hot (70°C) alkaline cleaner (pH 12) to remove the oil
and grease. With prolonged use, oil contamination deteriorated the efficiency of the alkaline cleaner. Every
two weeks the manufacturer was dumping 28 cubic meters of wash, but wanted to reduce disposal costs, raw
material costs, and environmental damage.
Recommended Action
Install an ultrafiltration system to recycle the cleaner and recover waste oil.
Anticipated Savings
Exhibit F.6 presents the economic comparison of the current operation to the recommended action.
Exhibit F.6: Annual Operating Cost Comparison for Single Use Rinse and Recycling Rinse
Savings
Raw Materials
Alkaline Cleaner
Oil-forming Compound
Waste Oil Hauling
Estimated Annual Net Savings
Current
$100,000
$350,000
$2,600,000
Percent Saved
50%
20%
90%
Recommended
$50,000
$70,000
$260,000
$380,000
Estimated Total Capital Cost: $282,000
Payback Period: >1 year
Implementation
The manufacture installed two Romicon UF modules to separate the oil waste from the cleaner. The
permeate (water, cleaner, surfactants, emulsifier) are returned to the wash tank for reuse. The waste oil
retentate is routed back to the process tank for concentration. Once thew waste oil in the process tank reached
a maximum of 15%, the tank contents are sent for recycling or disposal. The UF membranes in the main
process unit are cleaned monthly. With the ultrafiltration set-up, the manufacture is recovering 30 cubic
meters of permeate daily with 4.5 cubic meters of oil-forming compound per day available for reuse. A
payback period of under a year justified the fairly large capital expenditure for the manufacturer.
This case study was adapted from: "Metal Stamping Plant Recycles Alkaline cleaner and Recovers Waste
Oil. " Enviro$ense. http://es.epa.gov/studies/htmll0320.html.
Notes
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CASE STUDY #8: EFFICIENT RINSING SET-UP FOR CHEMICAL ETCHING
Current Practice and Observations
A multi-line Pennsylvania plater chemically etched all of the substrates before plating. The plater
used a single bath-dip rinse to remove the etchant from the substrate. This bath dip required large quantifies
of water and raw chemicals and produced high costs and amounts of wastewater.
Recommended Action
Install a countercurrent cascading rinse to minimize the volume of water used. Use restrictors to
control the water on the rinse lines for better control and increased efficiency. Slightly increase dwell times
between baths.
Anticipated Savings
A countercurrent cascading rinse provides improved rinsing quality with less water, thereby
reducing wastewater treatment costs, raw chemical usage, and freshwater usage. The primary modifications
necessary for this improvement are the installation of baffling and some piping changes, therefore capital
costs are low. The restrictors manage and control the amount of water used at each location, while still
proving sufficient water quantities to maintain product quality. Increasing the dwell time over the previous
tank after the parts are removed minimizes the mass of contaminated drag-out entering the next bath. Even a
small change in dwell time can reduce the water quantity needed for rinsing and increases the lifespan of the
baths.
Implementation
The Pennsylvanian plater installed a 2-tank counterflow rinse system, flow restrictors, and slightly
increased the dwell times. Exhibit F.7 illustrates the benefits realized by the plater with the implementation
of a 2-tank couterflow system.
Through experimentation the plater optimized its dwell times while still allowing for maximum
productivity and through-put on each of its lines. It is estimated that the hazardous waste production has
decreased from 240,000 pounds per year in 1994 to 130,000 pounds per year in 1997. In addition, the
company has decreased its chemical costs from wastewater treatment from $35,000 to $21,000 over the same
timeframe. These cost benefits were realized with minimal capital costs, therefore cost recovery began
almost immediately.
Notes
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Appendix F: Pollution Prevention Opportunity Case Studies
Notes
Exhibit F.7: Drag-Out Recovery as a Function of Recycle Rinse Ratio
100
40
20
20
40
60
80
100
RECYCLE RINSE RATIO
Notes:
Recyle rinse ratio = recycle rinse flow / drag-out flow rate.
Recycle rinse flow rate = surface evaporation from bath
This case study was adapted from: "The Navy Best Management Practices."
Http://www.bmpcoe.org, 1997.; and Environmental Regulation and Technology: The Electroplating Industry.
U.S. Environmental Protection Agency, 1985. EPA/625/10-85/001.
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CASE STUDY #9: WASTE REDUCTION IN THE CHROMATE CONVERSION
PROCESS
Current Practice and Observations
A manufacturer utilized captive plating, ammonium chloride zinc barrel plating, and chromate
conversion coatings in the production of door and window hardware. The operation produced 160 drums of
hazardous metal hydroxide sludge a year. The manufacturer wanted to reduce the volume of hazardous waste
needing disposal.
Recommended Action
Install a sludge dryer to dewater the waste material, thus reducing the volume of hazardous waste
needing disposal.
Anticipated Savings
Exhibit F.8 presents an economic comparison of the current operation to the recommended action.
Exhibit F.8: Economic Comparison of Wet Sludge Disposal versus Dried Sludge Disposal
Waste Disposal
Capital Cost
Wet Sludge Disposal
$29,760/year
Dried Sludge Disposal
$ll,560/year*
$29,950**
Anticipated Total Annual Savings: $18,200 per year
Payback Period: 3.5 years
* Includes utilities, amortization, labor, maintenance, taxes, insurance, overhead, and supplies
** Includes dryer, shipping, and installation
Implementation
With the installation of the sludge drier the manufacturer realized a reduction in waste from 160
drums of sludge to 78 drums of sludge annually. While the technology did reduce the volume of hazardous
waste needing disposal, the amount of metal present in the wastestream remained constant. A complete
drying cycle for this plant takes 4 to 5 hours, including loading, drying, and unloading, depending on the
percent solids of the sludge. The system has been operational since 1985.
This case study was adapted from: "Sludge Drier Employed at Electroplating Plant. " Enviro$ense.
http://es. epa.gov/studies/cs629. html.
Notes
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CASE STUDY #10: PLATING PROCESS BATH MAINTENANCE
Current Practice and Observations
A Canadian based plater used a continuous "bleeding" process to discard contaminants of the
pickling liquor. The acidic "bleed" was than neutralized with lime.
Recommended Action
Install a cartridge filter, ion exchanger, a feed pump, a sand filter, and a 400-gallon water supply
tank. Pump the pickle acid from the reservoir tank through a media filter to remove dirt and oil particles, then
a second smaller filter to remove very fine particles. Pass the pickled acid on to the water displacement
phase, which allows the pickled acid into the resin bed of the ion exchange unit. Reuse the water from the ion
exchanger by sending it back to the water supply tank. Drain the iron from the ion exchanger, and use a
counterflow of water to return the trapped sulfate ions to the sulfuric acid tank.
Anticipated Savings
Exhibit F.9 presents an economic analysis of the proposed operation.
Exhibit F.9: Operating Cost Analysis for Recommended Bath Maintenance Practices
Capital Costs
Design and Supply of Equipment
Equipment Installation
Start-up, Supplies, Etc.
TOTAL
Feedstock
Sulfuric Acid
Lime
TOTAL Anticipated Annual Savings
Payback Period:
Anticipated Start-Up Costs
$84,000
$10,000
$2,500
$96,500
Anticipated Annual Savings
$25,942
$17,995
$43,937
2.33 years
Implementation
The plater realized almost immediate benefits with the installation of the maintenance equipment.
Chemical (feedstock) use dropped almost immediately. Sulfuric acid use dropped by 561,531 pounds in the
first year and lime use decreased by 224 tons in the same time period for a total chemical reduction of 89
percent. In addition to the predicted amount of economic savings, another $8,000 was saved annually on
sludge hauling. Using the new maintenance process resulted in the reduction of iron content of the acid
solution from an initial 7.7 percent to a steady 2-3 percent. Since pickling uniformity is a product quality
improvement, product quality was at least as good as before the equipment was installed.
This case study was adapted from: "Use of Acid Purification Unit on Pickling Liquor Reduces Iron
Concentration. " Enviro$ense, Case Study: CS464. http://es.epa.gov/studies/cs464.html.
Notes
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CASE STUDY #11: CLOSED-LOOP PLATING BATH RECYCLING PROCESS
Current Practices and Observations
A plating operation based in Wisconsin uses an anhydrous chromic acid in its plating bath and an
insoluble sulfide treatment system for cleaning. The company's typical disposal consists of 25 percent solids
by weight at a cost of $0.19 per gallon of sludge. The operator wants to reduce chemical consumption and
waste disposal costs.
Recommended Action
Install 75-gallon per hour closed-loop recycling system that concentrates the chromium plating bath
drag-out in the rinse stream and removes it so that the plating solution bath can be returned to the main
processing tank.
Anticipated Savings
The total cost to install the recovery system was estimated at approximately $60,000. If the savings
in plating chemicals alone are considered, the investment would have a net cost of approximately $9,000 per
year. However, if the analysis also includes the savings in treatment chemicals and in solid waste disposal
charges, totaling $28,400 per year, there would be a net savings before taxes of nearly $20,000 per year and
the system would pay for itself in just under four years.
Implementation
The plating company installed the 75-gallon per hour recycling system. Installation of the closed-
loop recovery system reduced the need for replacing chromic acid (CrOs) to the plating solution by
approximately 4 pounds per hour. The total costs and savings of the evaporator are displayed in Exhibit F. 10.
The plating company further reduced the payback period by taking advantage of the investment tax
credit and accelerated deprecation allowances. The investment payback was reduced to less than three years,
a most acceptable investment rate of return.
Notes
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Notes
Exhibit F. 10: Economic Evaluation of Evaporator Installation
Installed Cost for 75-gal/hr evaporator
Annual Costs
Depreciation (10-yr life)
Taxes and insurance
Maintenance
Labor (1/2 hr/shrft at $6.00/hr)
Utilities:
Steam (at $3.507 106Btu)
Electricity
General plant overhead
Total Annual Cost
Annual Savings
Replacement chromic acid
Waste treatment reagents
Sludge disposal
Total Annual Savings
$60,000
$6,000
$3,600
$2,250
$16,000
$2,600
$31,650
$21,600
$23,000
$5.400
$50,000
Net savings before tax ($/yr.)
Net savings after tax, 48% tax rate
$18,350
$10,060
Payback after year (yr)
Payback with investment tax credit and accelerated
depreciation (yr.)
3.8
2.6
This case studywas adapted from: Environmental regulations and Technology: The Electroplating
Industry. U.S. Environmental Protection Agency, 1985. EPA/10-85/001.
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CASE STUDY #12: WATER-BORNE PAINT AS A SUBSTITUTE FOR SOLVENT-
BASED COATINGS
Current Practices and Observations
A Washington State based aerospace corporation used a multi-line solvent-based paint application
system for coating aircraft interiors. The manufacturer coated the walls, ceilings, floors, and removable parts
for the aircrafts with this system. The solvent-based system was costly and barely met VOC and health and
safety standards.
Recommend Action
Retrofit a portion of the solvent-based paint gun lines with ionizing electrode tips and water-borne
painting equipment. Isolate all equipment from potential electric grounds to ensure proper adhesion of the
electrostatic water-borne paints.
Anticipated Savings
The following economic comparison is made on a conservative set of assumptions. These
assumptions are listed below.
• Waterborne paint procurement cost: $20 per gallon
• Solvent based paint procurement cost: $40 per gallon
• Solvent procurement cost: $5 per gallon
• Water usage cost: $ 1.94 per 1000 gallons
• Industrial wastewater disposal cost: $0.2 per gallon
• Waste paint/solvent disposal cost: $1.25 per gallon
• Paint usage: 1,560 gallons per year
• Solvent usage (solvent based painting equipment cleaning): 156 gallons per year
• Water usage: (water based paining equipment cleaning): 260 gallons per year
• Waste paint/solvent generated: 1000 pounds per year
• Wastewater generated: 260 gallons per year
Exhibit F. 11 presents the economic comparison of the current operation to the recommended action.
Notes
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Notes
Exhibit F. 11: Annual Operating Cost Comparison for Water-Borne Paint Application and Solvent
Based Paint Application
Operational Costs
Paint
Solvent
Process Water
Wastewater Disposal
Waste Paint/Solvent
Disposal
Total Operational
Costs:
Anticipated Annual
Savings:
Payback Period
Annual Cost of
Solvent-Based
Painting
$62,400
$780
$0
$0
$1,250
$64,430
($64,430 -$31,451) =
Projected Costs for
Electrostatic Water-
Borne Painting
$31,200
$0
$1
$50
$200
$31,451
$32,979
0.20 years
The anticipated annual cost savings for the water-borne paint application system was $32,979. Since
the capital costs for equipment was assumed to be $6500 the payback period would be under a year.
Implementation
The actual cost saving was not as high as anticipated because equipment installation and operator
retraining were initially not considered in the cost analysis. The floors and some removable parts were the
only parts that could not be efficiently water-borne painted. The manufacturer noticed reduced VOCs, clean-
up costs, disposal costs, and hazardous waste generation, along with a quick capital cost turnaround.
This case study was adapted from: "Waterborne Paint." Navy and Marine Corps.
http://enviro.nfesc.navy.mil/p21ibrary/4-07_896.html and "Electrostatic Paint Spray System. " Navy and
Marine Corps. http://enviro.nfesc.navy.mil/p21ibrary/4-02_896.html.
F-26
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #13: HIGH VOLUME LOW PRESSURE (HVLP) PAINT SYSTEM
Current Practice and Observations
A manufacturer operates a small painting operation that utilizes high pressure air-assisted paint guns.
The paint guns are used for painting equipment and touchup painting on a weekly basis inside a paint booth.
The manufacturer disposes of 7,600 pounds of paint-related wastes on an annual basis. Three thousand
pounds of the waste were directly attributed to the spray gun operations.
Recommended Action
Replace the current high-pressure air-assisted paint guns with High-Volume Low-Pressure (HVLP)
sprayers. Operate the HVLP sprayers at 10 psi.
Anticipated Savings
The following economic comparison is based on a conservative set of assumptions. These
assumptions are listed below.
• 250 gallons of paint are used annually with conventional high pressure spray painting.
• Cost of paint is $ 120 per gallon.
• 55 gallons of paint thinner are used per year with the conventional system.
• Paint thinner costs $9.09
• 3,000 pounds of paint related wastes are generated with a conventional system.
• Disposal costs are $0.33 per pound.
• HVLP sprayers operate 50 percent more efficiently than the conventional high pressure system.
Exhibit F. 12 presents an economic comparison of the current operation to the recommended action.
Exhibit F.12: Economic Comparison of Air-Assisted Paint Guns versus High Velocity Low Pressure
Paint Application
Annual Cost of Current Practice:
Paint: $30,000
Thinner: $500
Waste: $1,000
TOTAL: $31,500
Capital Project Costs:
Equipment: $1,000
TOTAL: $1,000
Annual Project Costs:
Paint: $15,000
Thinner: $250
Waste: $500
TOTAL: $5,750
Expected Annual Savings: $15.750
Payback Period: Immediate
Implementation
The HVLP paint guns increased the percent of sprayed paint actually being applied the substrate.
The quality of the paint job resulting from the HVLP spray painting exceeded that of the conventional high-
pressure spray painting equipment. The reduction in paint usage led to a decrease in exposure to hazardous
chemicals. A side benefit of HVLP was the decrease in clogged paint filters and contaminated paper floor
coverings, both of which are handled as hazardous waste. In addition, the HVLP equipment allowed the
Notes
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F-27
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Appendix F: Pollution Prevention Opportunity Case Studies
M . operators to reduce the ventilation in the paint booths, which saves heat energy and clogging of the paint
1V Oi& S
booth filters.
This case study was adapted from: "Pollution Prevention Plan. " U.S. Coast Guard Training Center, Cape
May, New Jersey, 1997.
F-28 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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http://es. epa.gov/program/regional/stateAvi/gehl. html.
-------
Appendix F: Pollution Prevention Opportunity Case Studies
Notes
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F-30 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #15: WHITE WATER AND FIBER REUSE IN PULP AND PAPER
MANUFACTURING
Current Practice and Observations
A coated/fine paper mill manufactured intermediate products, later used in consumer goods. The
mill did not reuse the white water from the paper making process, and disposed of waste fiber and chips
separated through screening, deknotting, and general purification stages. The mill was using high quantities
of chemicals and was encountering large wastewater treatment, fresh water, energy, and disposal costs.
Recommended Action
Install white water and fiber recovery and reuse equipment. Return white water as filler in the paper
production process and reprocess captured fibers through chippers and digesters.
Anticipated Savings
The direct savings associated with the reuse of water and pulp include reduced water use, waste
generation, and energy use for fresh and waste water pumping and freshwater heating. The less tangible
benefits of water and pulp reuse often include increased revenue from enhanced product quality, better
company or product image, and reduced maintenance costs. Since the mill manufactures intermediate, rather
than consumer products, it cannot directly market its products on the basis of environmental performance in
the way that a consumer products company does. The estimated financial savings of implementing water and
fiber reuse are listed in Exhibit F. 14.
Exhibit F. 14: Summary of Financial Data for White Water and Fiber Reuse
Total Capital Costs
Financial Indicators
Net Present Value - years 1-10
Net Present Value - years 1-15
Internal Rate of Return - years 1-10
Internal Rate of Return -years 1-15
Annual Savings*
Estimated Annual Payback Period
Water and Fiber Reuse
$1,469,404
$2,073,607
$2,851,834
46%
48%
$911,240
1.6 years
* Annual operating cash flow before interest and taxes.
Implementation
The mill realized both monetary and environmental savings with the implementation of the white
water and fiber reuse equipment. The initial capital investment was paid back well within the mill's 2-year
payback rule of thumb.
This case study was adapted from: "Accelerating Industrial Pollution Prevention through
Innovative Project Financial Analysis; With Application to the Paper and Pulp Industry." U.S.
Environmental Protection Agency, Office of Policy Planning and Evaluation, 1993. EPA/7 42/R-9 3/004.
Notes
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F-31
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Appendix F: Pollution Prevention Opportunity Case Studies
Notes
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #16: CHEMICAL SUBSTITUION IN PULP AND PAPER
MANUFACTURING
Current Practice and Observations
A pulp and paper manufacturer produced products for book publishers and other intermediate
product manufactures. The paper was coated with a solvent/heavy metal coating to increase the durability
and visual appearance. The solvent based coating process was producing high levels of VOC emissions and
hazardous waste, and using large quantities of heavy metals.
Recommended Action
Replace the solvent/heavy metal paper coating with an aqueous/heavy metal-free coating. Construct
a steam heated coating storage shed to gain the longest shelf life from aqueous coatings.
Anticipated Savings
Both environmental and financial savings were anticipated with the proposed chemical substitution.
Environmentally, the chemical substitution was expected to reduce the levels of fugitive emissions and the
amount of solid waste going to the landfill. Monetary savings associated with the proposed chemical
substitution include a decrease in solvent recovery, management, future liability, and regulatory compliance
costs. Less tangible financial benefits expected of the pollution prevention investment included increased
revenue from enhanced product quality, company and product image, and worker health maintenance costs.
Although the company expected some quality improvements using aqueous coatings it did not anticipate an
increase in market value. Therefore, it expected no increase in domestic sales as a result of the conversion to
the aqueous/heavy metal-free coating. The company hoped to improve its competitive advantage in the
European market if the European Economic Community implements lead-free packaging standards (which
would apply to books) as expected. A reduction in solvent use was expected to reduce worker exposure to
fugitive solvent emissions, and eliminate nitrocellulose from the coating mixture to reduce flammability and
explosive hazards. The reduced solvent exposure was expected to result in lower incidence of worker illness
over the long-term and lower company health care costs. The estimated financial savings of implementing
the proposed chemical substitution are listed in Exhibit F. 15.
Exhibit F. 15: Summary of Financial Data for Aqueous/Heavy Metal Conversion
Total Capital Cost
Financial Indicator
Net Present Value - Years 1-10
Net Present Value - Years 1-15
Internal Rate of Return- Years 1-10
Internal Rate of Return- Years 1-15
Estimate Annual Savings (BIT)*
Payback Period
Aqueous Coating
$893,449
$314,719
$203,719
6 percent
1 1 percent
$118,112
7. 6 years
* Annual operating cash flow before interest and taxes
Implementation
The pulp and paper manufacturer found that while heavy-metal usage, VOC emissions, and
hazardous waste generation decreased, there was an increase in water, steam, and electricity usage.
Notes
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F-33
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Appendix F: Pollution Prevention Opportunity Case Studies
Notes
This case study was adapted from: "Accelerating Industrial Pollution Prevention through
Innovative Project Financial Analysis; With Application to the Paper and Pulp Industry." U.S.
Environmental Protection Agency, Office of Policy Planning and Evaluation, 1993. EPA/742/R-93/004.
F-34 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #17: ON-SITE RECYCLING
Current Practices and Observations
A medium-sized printer located in Los Angeles, CA produces a wide range of commercial printing
products including advertising inserts, business forms, brochures and pamphlets, and circulars. The printer
uses non-heat set inks exclusively. Approximately 1,500 pounds of ink in 17 different colors are used per
month. The inks are ordered in 30-pound kits. Black inks cost from $1.50 to $3.50 per pound; colored inks
from $3.50 to $7.50 per pound. The plant has an arrangement with its ink suppliers in which all of the waste
inks are returned to the supplier to be reformulated into black ink. The supplier mixes fresh black ink into the
waste ink to obtain an acceptable black color. Typically 50 to 100 pounds of fresh ink is added to each 100
pounds of waste ink. Approximately 200 to 300 pounds of waste ink are returned each month to the
manufacturer. After blending with the fresh black ink, the plant buys back 300 to 500 pounds per month of
black ink at a cost of $3.00 per pound. The price for the reformulated ink is relatively high based on the
relatively low quality of the ink. Fresh ink of comparable quality typically costs $1.55 per pound.
Recommended Action
The plant can obtain a potentially quick payback on its investment by purchasing an ink recycler. A
small on-site ink recycler is available which blends 60 pounds of waste ink with 120 pounds of fresh ink to
produce a 180-pound batch of reformulated black ink. The complete batch is then filtered and is ready for
use. One batch can be processed in one hour.
Anticipated Savings
The following economic comparison is made on a conservative set of assumptions. These
assumptions are listed below.
• 200 pounds of waste ink are produced per month.
• Labor and utility costs are negligible.
• Both cases produce a total quantity of black ink of 600 pounds per month
Case A: The plant buys a small on-site ink recycler.
• The recycler blends in 400 pounds of fresh ink to produce 600 pounds of reformed ink.
• The fresh ink costs $1.55 per pound.
• The ink recycler costs $5,900.
Case B: Keep the existing arrangement with the ink manufacturer.
• The ink manufacturer blends in 100 pounds of fresh ink to produce 300 pounds of reformulated ink
per month. The costs of this reformulated ink is $3.00 per pound
• The printer buys an additional 300 pounds of fresh ink at $ 1.55 per pound.
Exhibit F. 16 presents an economic comparison of the current operation to the recommended action.
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency F-35
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Appendix F: Pollution Prevention Opportunity Case Studies
JT , Exhibit F. 16: Economic Comparison of On-Site versus Off-Site Ink Recycling
Case A CaseB
Material Balance, (Pounds per Month)
Waste ink 200 200
Fresh ink for blending 400 100
Reformulated ink 600 300
Additional fresh ink 0 300
Total available ink 600 600
Operating Cost, (dollars per month')
Waste ink $0 $0
Fresh ink for blending (@ $ 1.55/lb) $620 $0
Buy back reformulated ink (@ $3.00/lb $0 $900
Buy additional fresh ink (@ $ 1.55/lb) $0 $465
Total Operating Costs to Recycle Ink $620 $1,365
Anticipated Annual Savings per Month $745
Payback Period 7.92 months
Implementation
With a cost savings in operating costs of $745 per month the $5,900 initial capital investment for the
on-site ink recycler can be recovered in just less than 8 months. The time and labor costs of preparing waste
ink for off-site recycling are comparable to that required to prepare and operate the on-site ink recycler.
This case study was adapted from: Guides to Pollution Prevention, The Commercial Printing
Industry. U.S. Environmental Protection Agency, Office of Research and Development, 1990. EPA/625/7-
90/008.
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Appendix F: Pollution Prevention Opportunity Case Studies
CASE STUDY #18: SOLVENT REDUCTION IN COMMERCIAL PRINTING
INDUSTRY
Current Practice and Observations
A commercial screen printing firm produces a wide variety of products including decals, banners,
point-of-purchase displays, and original equipment manufacture. Over the 40 years of its operation, this
company has experienced toughening environmental and health regulations on local, state, and federal
levels. Many regulations have required expensive changes or threats of high fines for noncompliance. About
60 percent of the company's printing is done with traditional solvent-based inks and 40 percent with
ultraviolet (UV) curable inks. Open tanks of solvent-based cleaning product allowed large amounts of VOCs
to evaporate directly into the shop.
Recommended Action
Install an in-process 5-gallon recycling still to recover solvents for reuse within a closed system.
Anticipated Savings
The following economic comparison is based on a conservative set of assumptions. These
assumptions are listed below.
• The current operation uses 40 gallons of solvent per day.
• With a solvent recovery still, one 55-gallon drum of solvent is used every four weeks.
Exhibit F. 17 presents an economic analysis of the recommended action.
Exhibit F.17: Cost Analysis for a 5-Gallon In-Process Solvent Recycling
Costs
Capital Cost:
Anticipated Daily Savings Over
Open Tank System:
Anticipated Annual Savings
Over Open Tank System:
Payback Period
5- Gallon In-Process Solvent Recycling Still
$2,900
$83 per day
$20,750 per year
7 weeks
Implementation
The company recognized almost immediate results with the installation of the in-process solvent
recycling still. The amount of solvent used daily dropped by almost 38 gallons, which led to savings of
nearly $85 per day. Along with cost benefits the new system severely reduced VOC releases. The VOC
reduction improved working conditions, and placed the company's emissions below environmental
regulatory limits.
This case study was adapted from: "Small Business Waste Reduction Guide, Screen Printing Case Study
#1. " Enviro$ense. http://es.epa.gov/new/business/sbdc/sbdcll8.htm.
Notes
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F-37
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Industrial Operations: Office Operations
Notes
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F-38 Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Index
INDEX
Notes
Absorption refrigeration • 258, 287,289,290
capacity • 62, 66, 72, 73, 246, 259, 281, 285, 288, 289,
291,292,294,295
operation • 17, 57
Affirmative procurement • 94
Affirmative Procurement • 14
Air • 8, 18, 63, 72, 74, 77, 78, 272, 274, 275, 277, 278,
279, 280
boiling curve • 3
components of • 2
conditioning • 6. See Air condtioning
cooling of moist air • 8. See also Air conditioning
distribution system • 7
energy content • 3
heat addition to moist air • 6. See also Air conditioning
heat gain calculations • 12
heat loss calculations • 10. See also Air conditioning
humidity • 3
properties of • 2
real (moist) • 2
relative humidity • 4
specific volume • 4
water vapor • 2
water vapor, amount in • 3
Air compressor • 7, 272, 277
air leaks • 7, 274, 275, 276,280
case study
install a low pressure blower to reduce compressed
air use • 17
repair compressed air leaks • 13
controls • 63, 83, 272, 277
intake • 68, 272, 278
low pressure blower • 279, 280
low pressure blowers • 280
power • 7, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72,
73, 74, 264, 271, 272, 275, 277, 278, 279
pressure • 7, 72, 73, 262, 263, 264, 269, 271, 272, 274,
275, 276, 277, 278, 279
screw • 7, 272, 276, 277, 278
types • 7
waste heat-61,272, 277
Air conditioning • 8, 45, 46, 63, 68, 303, 304, 305, 306,
307, 308, 309, 310, 311, 312, 314, 318, 332
air cleaners • 304
air washer • 304, 324
coils • 8, 303, 304, 308, 332
controls • 63, 83, 305, 308
distribution system • 62, 65, 66, 303, 305
economizer cycle • 310, 311, 312, 313
energy conservation • 3, 4, 8,46
enthalpy switchover method • 310, 313
fans-6, 68, 315, 327, 329
filters • 80, 304, 305
outdoor temperature method • 312, 313
processes•6
Air emission • 4, 20,40, 44, 47, 52, 61, 74, 75, 78,
84, 116, 124, 132, 133, 134, 136, 137, 144, 146,
149, 156, 172, 174, 179, 180, 181, 182, 183, 184,
185,197,202
control costs • 44
costs-20, 40, 41, 43, 51,57
fees • 44, 108
labor • 3, 12, 44, 48, 91, 96, 97, 98, 100, 101, 102,
103, 106, 114, 116, 137, 140, 143, 192, 195,
208, 241
monitoring • 44, 62, 75, 150, 167, 168, 193, 194,
204, 205, 234, 239
sources • 61, 67, 73, 74, 103, 122, 123, 156, 210,
212,234,244,247,248,249
Air emissions • 44
management • 44
Annubar • 43
Assessment • 1, 2, 3,11, 12, 13, 14, 15, 16, 17,18,
20,21,39
analysis • 3, 4, 18, 19, 21, 24, 25, 39, 40, 45, 47,
48, 49, 52, 53, 67, 105, 109, 123, 130, 131
assessment • 1, 2, 3, 11, 12,13, 14, 15, 16, 17,18,
39,61,63,76
assessment team • 2, 3, 5, 8, 36, 40, 43, 44, 45, 46,
76
benefits -1,3,11,12, 22, 26, 45, 50, 52, 62, 68,
93, 101, 104, 107, 117, 124, 126, 127, 128,
135, 137, 140, 141, 154, 161, 167, 172, 173,
180, 186, 189, 192, 194, 196,204,208,212
block diagram • 19
data • 3, 14,18, 19, 21, 22,23, 24, 35, 64, 67
collection • 3, 18, 19, 20, 23, 35, 40, 41, 45, 55,
100, 130, 191, 193
energy graphs • 32
energy usage • 2, 3, 20, 21, 31, 32, 36, 45, 46,
69,278,315
equipment • 1, 3, 4, 5, 6, 7, 8, 11, 12, 18, 19,
20, 21, 22, 25, 26, 43, 45, 46,47, 48, 51, 52,
54, 55, 57, 62, 63, 64, 66, 67, 68, 71, 72, 74,
77, 79, 80, 83, 87, 88, 89, 96, 101, 105, 106,
110, 112, 116, 117, 120, 122, 123, 127, 129,
130, 132, 133, 142, 143, 144, 145, 146, 147,
148, 156, 164, 165, 169, 172, 176, 177, 179,
184, 188, 190, 191, 193, 196,206,207,209,
212, 234, 239, 241, 244, 245, 247, 249, 250,
252, 253, 254, 257, 262, 265, 269, 272, 279,
281, 292, 294, 296, 299, 300, 303, 304, 305,
306, 307, 316, 317, 327, 329, 331, 332
facility description • 3, 18, 26
information- 1,3, 12, 14, 17, 18, 19,20,21,
22, 25, 35, 39, 40, 43, 45, 57, 58, 67, 71, 74,
87, 99, 101, 104, 105, 147, 149, 150, 154,
172,186,281
operations • 3, 4, 6, 12, 17, 19,21, 22, 23, 25,
26, 28, 29, 39, 40, 43, 61, 63, 67, 68, 72, 73,
74, 75, 76, 79, 87, 93, 95, 100,102,103,
104, 105, 107, 110, 111, 112, 116, 117, 118,
121, 128, 130, 144, 145, 148, 149, 150, 151,
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Index
Notes
154, 155, 156, 158, 161, 172, 173, 174, 184,
185, 186, 188, 189, 190, 196, 197, 198, 199,
202,204,205,206,210,212
pre-assessment collection • 18
process description • 3, 18, 19,20, 28, 29
process flow diagram • 3, 18, 19, 23, 35
raw materials • 2, 15, 19, 20, 47, 52, 78, 81, 84,
156,165, 199,208
utilities • 20
utilities (See energy usage) • 13, 19, 21, 47, 48,
61,63,66,70
utility information • 20
waste generation data • 18, 22
waste streams • 19, 20, 22, 24, 74, 92, 104, 107,
149,156,164, 167,188,211
economic • 3, 12, 24, 25, 39, 48, 50, 51, 52, 53, 54,
57, 66, 254, 294, 300
energy • 1, 2, 3, 5, 7, 8, 11, 12, 14, 15, 18, 20, 21,
26, 36, 40, 43, 45,46, 52, 61, 62, 63, 67, 68, 69,
70, 71, 72, 73, 234, 238, 241, 242, 243, 244, 245,
246, 247, 248, 249, 250, 252, 253, 254, 256, 257,
258, 259, 262, 263, 264, 265, 269, 272, 274, 275,
276, 277, 278, 279, 281, 285, 286, 287, 290, 291,
292, 294, 295, 296, 297, 298, 299, 300, 301, 303,
305, 306, 308, 310, 315, 316, 317, 318, 327, 329,
331
energy graphs • 21
evaluation • 3, 4, 11, 12, 22, 24, 25, 39,44, 45, 47,
48, 54, 57, 254, 255, 258,259,298, 330, 331
evaluation • 39. See also Evaluation
example • 5, 8, 15, 17, 36, 40, 53, 62, 63, 64, 66, 67,
68, 74, 91, 98, 122, 124, 130, 137, 139, 150, 189,
195, 202, 203, 206, 212, 234, 241, 242, 243, 244,
245, 247, 248, 249, 252, 258, 259, 281, 285, 286,
287, 293, 294, 295, 297, 298, 299, 301, 307, 309,
312, 313, 318, 319, 320, 328, 329, 331
facility description • 3, 18, 26
facility layout • 19
feasibility analysis • 3, 24, 39
implementation • 1, 3, 4, 11, 13, 14, 24, 25, 26, 39,
45,47
industrial • 1, 2, 4, 6, 11, 12, 13, 14, 15, 16, 17,26,
39
industrial assessment • 12
instrumentation for • C-l
management support -2, 13, 26
methodology • 11, 15, 16, 24
objectives • 14, 17
opportunity (See Opportunity) • 1, 3, 4, 5, 12, 14,
19, 22, 23, 24, 25, 39, 44, 45, 46, 47, 51, 57, 66,
67, 294, 299
phases-2, 16,24
planning and organization • 3, 12, 17
pollution prevention • 1, 2, 3, 5, 11, 14, 15, 18, 20,
22, 24, 25, 26, 37, 45, 48, 49, 53, 62, 73, 75
prioritization of opportunities • 24
procedures • 3, 16, 23, 24, 39, 45, 48
process description • 3, 18, 19,20, 28, 29
process flow diagram • 3, 18, 19, 23, 35
raw materials • 2, 15, 19, 20, 47, 52, 78, 81, 84,
156,165,199,208
report • 25
SIC • 76, 77, 78, 79, 80, 81, 82, 83, 84, 280
strategy • 17
structure • 57, 128
team • 17
technical • 3, 4, 24, 25, 39, 45, 53
types- 1,17,18,63,74
utility
information • 25
waste • 1, 3, 11, 13, 15, 17, 18, 19, 20, 24, 25,26, 36,
43, 44, 52, 55, 56, 57, 61, 62, 72, 73, 74, 75, 76, 77,
79, 80, 81, 82, 83
waste generation • 1, 2, 3, 11,12, 14, 17, 18, 19, 22,
35,40,45,55,56,73,81
B
Ballast-231
Belt-220,221,222
Boiler • 36, 53, 224, 234, 235, 236, 238, 239, 240, 241,
242, 243, 245, 254, 256, 257, 258
air fuel ratio • 39, 235
air/fuel • 6
blowdown • 6, 235, 236, 238
case studies
Implement periodic inspection and adjustment of
combustion in an oil fired boiler • 3
case study
implement periodic inspection and adjustment of
combustion in an oil fired boiler • 5
combustion • 6, 53, 54, 72, 234, 236, 238, 239, 240,
241, 242, 243, 244, 246, 247, 250, 252, 253, 254
distribution system • 6
economizers • 235,245
efficiency • 6, 24, 73, 80, 83, 234, 235, 236, 238, 240,
241, 242, 244, 248, 251, 252, 253, 257, 258, 282,
285, 292, 295, 296, 297, 298, 299
feed water preheat • 244
fire tube • 234
flue gas • 53
forced draft • 234
high pressure • 77, 234
hot water • 8, 73, 234, 243, 246, 247, 255, 287, 288,
295, 296, 297
natural draft • 234
natural gas • 15, 21, 54, 61, 71, 241, 248, 249, 250,
251,254,257
operation • 6, 17, 57
performance improvements • 241
return system • 6, 234, 243,244
steam • 6, 8, 15, 20, 24, 39,45, 46, 61, 67, 72, 73, 82,
234, 235, 236, 242, 243, 244, 247, 248, 254, 255,
256, 257, 258, 287, 288, 289, 290, 291, 295, 296,
297
steam leaks • 72, 242
steam traps • 6, 243, 244
tips • 234
water tube • 234, 235
Boilers • 46
Burner -21, 240, 241, 250, 251
combustion efficiency • 6, 240, 250
excess air • 53, 235, 241, 245, 252
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Index
c
CAA (See Clean Air Act) • 4, 74
Ceiling fan • 247, 248
Ceiling fans
case study
energy saving from installation of ceiling fans • 7
Centrifugal pump • 7, 262, 263, 264, 265
curve • 67,263,265, 266, 267,271,294
Chiller • 288
absorption • 8, 73, 287, 288, 289, 290, 300
Chlorination-83,212
Clean Air Act-4, 54, 173
Cleaning • 31, 37, 63, 76, 87,110,112,116,117,119,
120, 121, 127, 131, 132, 134, 135, 138, 139, 140, 141,
142, 143, 149, 150, 154, 155, 172, 185, 198,203,213
Coal • 46, 235
Coefficients • 323
convection heat transfer • 323
Cogeneration • 6, 61, 253, 254, 255
cycles • 252, 254, 259
high spot evaluation -258
Combustion • 72, 234, 238, 239,240,241,242,244,245,
250
air preheat • 244, 245, 247
efficiency • 6, 73, 80, 83, 234, 235, 236, 238, 240,
241, 242, 244, 248, 251, 252, 253, 257, 258
incomplete • 250
Compressed air • 4, 7, 22, 24, 57, 80, 262, 272, 274, 278,
280
Cooling • 7, 281, 282, 283, 284, 286, 289, 304, 308, 309,
318,324,325
direct evaporative -281
Cooling tower-7, 281,286
atmospheric • 79, 281
hot gas defrost • 8
hyperbolic • 282
induced draft • 282
performance • 57, 63, 286, 294, 295, 296, 298
Cost • 32, 35, 43, 51, 53, 55, 56, 97, 135, 161, 214, 233,
241, 242, 243, 244, 249, 259, 272, 274, 277, 278, 279,
280, 285, 286, 287, 290, 297, 298, 299, 300, 307, 313,
314, 328
equipment • 47
installation • 48, 55, 57, 66, 68, 96, 110, 151, 189,
215, 221, 230, 231, 242, 244, 252, 253, 254, 255,
264, 269, 294, 296, 300, 305, 306, 330
labor • 3, 12, 40, 43, 44, 48, 57, 91, 96, 97, 98, 100,
101, 102, 103, 106, 114, 116, 137, 140, 143, 192,
195,208,227,241
modifications • 47
project • 48, 49, 50, 51, 54, 57, 58, 59, 195, 254
software • 61
waste • 11, 12, 13, 14, 20, 40, 43, 44, 55, 56, 57, 61,
62, 72, 73, 74, 75, 76, 77, 79, 80, 81, 82, 83, 87, 90,
91, 92, 93, 94, 96, 98, 99, 100, 101, 102,103,104,
105, 106, 107, 108, 109, 110, 112, 113, 114, 115,
116, 117, 123, 130, 140, 143, 144, 145, 146, 147,
148, 149, 150, 151, 153, 154, 155, 156, 158, 164,
165, 167, 168, 169, 170, 171, 172, 179, 180, 181,
182, 183, 184, 185, 188, 189, 190, 193, 195, 196,
197, 198, 202, 203, 204, 206, 207, 208, 209,
210, 211, 212, 245, 247, 250, 252, 253, 254,
257, 272, 277, 287, 290, 330
waste management • 13, 20, 74, 87, 93, 100, 105,
112,117,147,172,185,204,212
Cost savings • 4, 25, 26, 52
industrial processes • 210, 234
methods • 4, 7, 37, 49, 51, 52, 54, 57, 77, 79, 81,
84, 89, 103, 122, 124, 131, 135, 143, 144, 155,
156, 158, 161, 162, 163, 164, 165, 167, 168,
172, 174, 178, 180, 185, 186, 193, 198,202,
209, 212, 238, 250, 252, 258, 263, 264, 270,
271,307,310,314,315,330
Cost savings (See also electricity cost reduction) •
36, 47, 75, 90, 97, 140, 149, 156, 167, 206, 208,
241, 242, 243, 244, 255, 272, 274, 275, 276, 277,
278, 279, 285, 286, 287, 297, 298, 299, 301, 317
Cost savings calculations
methods • 48
D
Decision matrix • 3, 24, 25, 37
Decomposition • 15, 146, 163
DEFINITIONS • D-l
Degreasing • 74, 81, 116, 117, 120, 127, 134, 138,
139, 140, 146, 149, 150, 152, 153, 156, 158, 174,
196
Demand • 41
controls • 63, 83, 234, 235, 241, 243, 250, 251,
257, 272, 277, 305, 308
peak demand • 21, 36
peak demand • 31
reduction • 62, 63, 66, 67, 68, 75, 79, 235, 242,
243, 245, 247, 258, 263, 264, 267, 270, 271,
272, 312, 313, 314, 316, 328, 329, 332
shifting • 63
Demand (See also load) • 17, 21, 40, 41, 61, 63, 65,
66, 67, 68, 69, 70, 71, 72, 253, 254, 256,257,258,
259,264,272,277,313,329
Destratification • 6, 247, 248
Destratification fan • 247
Detoxification • 15
Disposal (See Waste) • 12, 15, 20,40, 43, 44, 47, 48,
52, 53, 55, 56, 57, 62, 73, 74, 75, 90, 91, 92, 96,
97, 98, 99, 100, 101, 102, 103, 106, 108,109,110,
114, 116, 119, 123, 124, 131, 132, 139, 141, 143,
147, 154, 156, 169, 170, 171, 172, 176, 178, 186,
188, 190, 191, 193, 194, 196, 203, 204, 208, 209
Documents • 5, 14
Dragout- 124,136,139
Drive • 61, 63, 242, 246, 265, 271, 291, 294
variable frequency • 6, 234, 264, 265
Economic feasibility • 3, 4, 24, 25
internal rate of return • 54, 58, 59
net present value • 50, 54, 57, 58
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Index
Notes
payback period • 25, 49, 55, 57
total cost accounting • 52, 53, 54
Economizer • 281, 292, 310, 311, 312, 313
Efficiency • 1, 2, 6, 7, 11, 12, 14, 15, 17, 24, 26, 43,
45, 73, 80, 83, 214, 215, 216, 217, 220, 222, 223,
229, 230, 231, 234, 235, 236, 238, 240, 241, 242,
244, 248, 251, 252, 253, 257, 258, 262, 263, 264,
269, 271, 275, 276, 278, 282, 285, 292, 295, 296,
297, 298, 299, 303, 304, 305, 306, 315, 316, 327,
328, 329, 331
thermal • 8, 61, 73, 241, 246, 252, 253,257,258,
259,281,299
Electric bill • 40, 65, 66, 69, 71
charge • 40
components • 62, 63, 74
customer charge • 40
customer charge • 41
demand charge • 17, 40, 66, 67, 68, 70, 71, 72
demand charge • 41
energy charge • 68, 69, 70
example • 62, 63, 64, 66, 67, 68, 74
gross bill • 70
industrial use • 72
peak demand • 66, 67, 68, 72
power factor • 41, 63, 64, 65, 66, 68, 70
reactive demand charge • 41
sales tax • 42
service charge • 69
structure • 40
voltage • 41, 62, 63, 65, 66, 68, 70, 71
Electric motor • 5, 7, 214, 262,271,291
efficiency • 73, 80, 83,214, 215, 216, 217, 220,
222, 223, 229, 230, 231, 262, 263, 264, 269, 271,
275, 276, 278, 282, 285, 292, 295, 296, 297, 298,
299, 303, 304, 305, 306, 315, 316, 327, 328, 329,
331
high efficiency -216, 228, 263
idling-5, 214
load reduction • 292
mechanical drives • 221
speed control • 220, 221
speed reduction • 221
torque-214, 220,221,222
Electric rate • 227
Electrical power
components • 62, 63, 74, 228, 303, 315, 317
Electricity • 34, 46, 62, 63, 73, 214, 216, 221
controllers-67, 68,218,241
distribution system • 41, 62, 65, 66, 269, 303, 305
electric bill (See Electric Bill) • 40, 65, 66, 69, 71
industrial use • 72
lamp maintenance • 227
lamp replacement • 227,230
lights • 62,225, 226, 227
transformers • 62
Electricity costs • 34
Electronic ballast • 228, 229, 232
Emission reduction • 133
aqueous cleaning • 81,117,132, 134, 139,140,145
substitution • 57, 58, 61, 132, 173
Encapsulation • 15
Energy • 1, 2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 18, 20,
21, 31, 32, 40, 41, 43, 45, 46, 52, 60, 61, 62, 63, 67,
68, 69, 70, 71, 72, 73, 39, 214, 218, 219,220,221,
222, 223, 226, 227, 228, 229, 230, 231, 232, 233, 234,
238, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250,
252, 253, 254, 256, 257, 258, 259, 260, 262, 263, 264,
265, 269, 272, 274, 275, 276, 277, 278, 279, 280, 281,
285, 286, 287, 290, 291, 292, 294, 295, 296, 297, 298,
299, 300, 301, 302, 303, 305, 306, 308, 310, 315, 316,
317,318,327,329,331,332
alternative • 78, 79, 83, 231, 243, 248, 263, 271
charge • 67, 68, 69, 70, 71, 258, 287
coal-61, 72, 73,235,254,258
conservation • 4, 5, 6, 11, 12,15, 25, 43, 45, 61, 62,
223,262,276,303,318
consumption • 18, 20, 31, 45, 46
cooling • 6, 7, 8, 45, 244, 246, 248, 252, 259, 269,
272, 277, 279, 281, 282, 285, 286, 287, 288, 291,
292, 293, 294, 295, 297, 300, 304, 307, 308, 310,
312,313,317,324
cooling season • 21
cost • 1, 6, 7, 11, 13, 21, 31, 32, 41, 49, 54, 57, 61, 62,
67, 68, 69, 70, 71, 73, 75, 216, 218, 220,221,222,
223, 226, 227, 228, 230, 232, 241, 242, 243, 244,
248, 249, 253, 254, 255, 256, 257, 258, 259, 263,
264, 265, 271, 272, 274, 275, 276, 277, 278, 279,
285, 286, 287, 289, 290, 295, 297, 298, 299, 300,
301, 303, 305, 308, 309, 310, 312, 313, 314, 317,
328, 331
costs- 18,20,33,39
electric • 4, 6, 21, 40, 42, 61, 62, 65, 66, 67, 69, 71,
72, 78, 214, 215, 218, 220, 227, 230, 238, 248, 249,
250, 253, 257, 258, 262, 264, 271, 287, 291
fossil fuel • 4, 72, 254
generation • 4, 47, 61, 63, 67, 72, 73, 74, 75, 78, 228,
235, 236, 240, 253, 257, 258, 320
heating • 6, 8, 40, 45, 54, 61, 63, 72, 73, 218, 231,
236, 239, 241, 243, 244, 245, 246, 247, 248, 249,
250, 252, 255, 257, 259, 272, 292, 295, 297, 299,
303, 304, 307, 308, 309, 310, 313, 317, 324, 327,
328, 331
heating season • 21
hydroelectric • 4, 73
management • 43
nuclear • 61,258
reduction • 25
solar • 73, 258
solid waste • 14, 72, 73, 74, 75
sources • 4, 6, 21, 45, 61, 67, 73, 74, 221, 231, 234,
244,247,248,249,290,331
terminology • 40
thermodynamic analysis • 1
unit of measure • 3, 21, 45, 47
usage • 13, 21, 32, 61, 71, 72, 74, 80, 230, 257, 263,
272,278,287,299,331
wind • 73
energy conservation • 1, 3, 4
Energy conservation • 1, 2, 3,4, 5, 8, 9, 11, 12, 14, 15,
17, 18, 20, 22, 23, 24, 25, 26, 36, 37, 39, 40, 45, 46,
47, 48, 51, 53, 60, 62, 72, 39, 214, 220, 226, 234, 242,
243, 247, 254, 258, 260, 262, 263, 265, 272, 276, 281,
303, 305, 306, 315, 317, 318, 329, 332
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Index
Energy conservation opportunities • 1
energy saving from installation of ceiling fans • E-7
implement periodic inspection and adjustment of
combustion in an oil fired boiler • E-5
implement periodic inspection and adjustment of
combustion in an oil fired boiler • E-3
install a low pressure blower to reduce compressed air
use • E-17
install infrared radiant heaters • E-9
repair compressed air leaks • E-13
Energy Conservation Opportunities
Implement periodic inspection and adjustment of
combustion in a natural gas fired boiler • E-3
Energy conservation opportunity • 5, 11, 12, 22, 37, 40,
46, 72, 247
Repair compressed air leaks • 36
Energy consumption
reduction • 46
Energy source • 22
information • 40
Energy usage • 33, 47
Environmental Protection Agency (See EPA) • 60, 39,
213
EPA • 1, 3, 5, 9, 11, 14, 15, 18, 60, 74, 39, 94, 120, 121,
181,182,213
17 Industrial Toxics • 14
Regional offices • A-l
Equipment • 5, 20,22, 24, 25, 36, 53, 77, 82, 214, 220,
245, 257, 260, 279, 296, 300, 303, 315, 316
absorption • 8, 73, 244, 258, 287, 288, 289, 290, 300
air compressors • 5, 7, 63, 225, 272, 274, 278
air conditioning • 8,45, 68, 244, 258, 290,291,292,
294, 300, 303, 304, 305, 306, 307, 308, 310, 311,
312,314
boilers • 5, 11, 45, 53, 72, 73, 74, 234, 235, 241, 242
cogeneration • 6, 61, 253, 254, 255, 257, 258, 290
cooling towers • 7, 281, 282, 286, 292
drying (See heating) • 6, 73, 83, 247, 250, 290, 329,
332
fans • 6, 8, 68, 216, 218, 225, 243, 247, 248, 265, 269,
271,281,282,315,327,329
furnaces -11,72, 74, 78, 225, 244, 250, 251, 252
heating • 6, 8, 40, 45, 54, 61, 63, 72, 73, 218, 231,
236, 239, 241, 243, 244, 245, 246, 247, 248, 249,
250, 252, 255, 257, 259, 272, 292, 295, 297, 299,
303, 304, 307, 308, 309, 310, 313, 317, 324, 327,
328, 331
HVAC • 8, 11, 292, 303, 315, 316, 317, 318, 319
HVAC•1
insulation • 6, 8, 222, 245, 250, 252, 253, 281, 292,
296, 297, 298, 299, 300, 321
list • 3, 22, 23, 67, 68, 74, 75, 76, 240
mechanical • 5, 8, 81, 214, 220, 221, 225, 229, 281,
282, 287, 290, 292, 295, 296, 303, 310, 327
modifications • 15, 45, 47, 57, 75
motors • 5, 6, 8, 45, 62, 63, 64, 65, 66, 214, 215, 216,
217, 218, 220, 221, 222, 224, 225, 262, 264, 271,
280,281,286,316,317
pumps • 7, 57, 61, 77, 83, 218, 225, 226,236,262,
263, 264, 265, 267, 281, 292, 307
refrigeration • 7, 8, 258, 259, 264, 281, 287, 290, 291,
292, 293, 294, 295, 298, 304, 307, 310
thermal storage • 61, 258, 259
ventilation • 8, 222, 247, 303, 313, 327, 329, 330,
332
Equipment list • 22
Evaluation • 25, 39, 44, 48, 255, 258, 259
assumptions • 39, 40, 45,46, 55, 56, 57
benefits • 39
costs
energy • 39
raw material • 39
costs
waste management • 39
current practices • 39
describe opportunity • 39
determining feasibility • 39
economic benefits • 39
energy conservation calculations • 47
energy costs • 12, 40, 52, 61, 227, 247, 248, 262,
290
equipment • 39
example • 47
impacts • 4, 20, 25, 26, 39, 40
Internal Rate of Return • 48
Net Present Value • 48
operations • 3, 12,19, 23, 25, 26, 39, 40,43, 61,
63, 67, 68, 72, 73, 74, 75, 76, 79, 230, 234,
247, 250, 252, 254, 258, 298
Payback period • 48
pollution prevention calculations • 47
pollution prevention calculations • 46
procedures • 39
raw material
consumption • 47
raw materials • 2, 15, 19, 20, 47, 78, 81, 84
technical • 47
technical evaluation • 47
technical feasibility • 39
Evaluation economic • 48
Evalution
energy conservation calculations • 45
Fan • 7, 8, 218, 219, 220, 224, 247, 248, 269, 270,
271, 282, 286, 303, 305, 306, 307, 313, 314, 315,
316,317,329
ducting-248, 317
efficiency • 7, 73, 80, 83, 214, 215, 216, 217, 220,
222, 223, 229, 230, 231, 234, 235, 236, 238,
240, 241, 242, 244, 248, 251, 252, 253, 257,
258, 262, 263, 264, 269, 271, 275, 276, 278,
282, 285, 292, 295, 296, 297, 298, 299, 303,
304, 305, 306, 315, 316, 327, 328, 329, 331
horsepower • 214, 216, 218, 219, 220, 262, 264,
266, 267, 269, 270, 271, 272, 277, 278, 292,
294, 303, 305, 313, 314, 317, 329
inlet vane control • 270
reduced speed -218,220, 265
variable speed • 7, 219, 220, 221, 243, 263, 264,
267,271,286
volume control • 7, 270,271
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Index
Notes
flue gas • 54, 74, 235, 241, 245, 246, 250, 252
Fossil fuel • 4, 72, 254
Fuel oil- 12,14,21,32,43
bill • 43
consumption • 43
cost • 43
energy conservation • 3, 46, 62, 72, 234, 242, 243,
247, 254, 258
example • 43
rates-71, 244, 253, 254, 258
types • 18, 21, 43, 63, 74, 245, 247, 253, 254
Fuel Oil • 22, 32
Furnace • 6, 21, 43, 72, 78, 240, 245, 246, 250, 251,
252, 253
covers-6, 77, 82,241,253
efficiency • 73, 80, 83,234, 235, 236, 238, 240,
241, 242, 244, 248, 251, 252, 253, 257, 258, 303,
304, 305, 306, 315, 316, 327, 328, 329, 331
pressure controls • 252
G
Garment insulation values • 322
Gas bill
metering • 252
rate schedule • 42, 66, 69, 70, 71
H
Hazardous waste • 14, 18, 20, 22, 24, 43, 44, 47, 54,
75, 95, 96, 99, 106, 108, 109, 110, 112, 140, 148,
150, 154, 158, 163, 164, 165, 173, 174, 176, 178,
186, 188, 189, 190, 192, 193, 194, 195, 197,205,
206
containers • 40, 44, 47, 79, 80, 81, 84, 91, 92, 94,
96, 97, 98, 99, 100, 102, 103, 107, 122, 130, 172,
177,203,208
disposal fee • 44
labor • 3, 12, 44, 48, 91, 96, 97, 98, 100, 101, 102,
103, 106, 114, 116, 137, 140, 143, 192, 195,208
transportation • 12, 44, 61, 73, 102, 103, 108, 147,
155
Heat • 6, 7, 8, 36, 61, 72, 73, 75, 78, 234, 235, 236,
237, 238, 239, 240, 242, 243, 244, 245, 246, 247,
248, 249, 250, 252, 253, 254, 256, 257, 260, 272,
275, 277, 279, 280, 281, 286, 287, 288, 289, 290,
291, 292, 293, 295, 296, 297, 298, 299, 300, 303,
306, 307, 308, 310, 314, 315, 319, 320, 321, 323,
328,329,330,331,332
case study
install infrared radiant heaters • 9
Heat exchanger • 239, 240, 245, 246, 277, 281, 288,
293,315,331,332
plate • 79
rotary • 246, 276
tube • 235, 245, 246,248,293, 331
Heat gain • 297, 298
Heat loss • 8, 243, 247, 297, 299, 300, 328, 329
Heat pipe-245, 246, 331
Heat recovery system • 244, 245, 330, 331
Heat recovery systems • 244,245
Heat transfer • 235, 244, 246, 247,249,286,293,297,
298, 300, 303, 331
Heat wheel • 246
Heating • 6, 8, 21, 40, 45, 46, 54, 61, 63, 72, 73, 236,
239, 241, 243, 244, 245, 246, 247, 248, 249, 250, 252,
255, 257, 259, 260, 272, 292, 295, 297, 299, 302, 303,
304, 307, 308, 309, 310, 313, 317, 318, 324, 327, 328,
330,331,332
applications • 6, 8, 68, 83, 244, 246, 248, 249, 250,
251, 253, 254, 262, 281, 287, 290, 291, 296, 298,
299, 300, 305
comfort • 6, 68, 246, 247, 249, 303, 304, 305, 307,
310, 313, 315, 317, 319, 320, 321, 323
electric • 61, 62, 65, 66, 67, 69, 71, 72, 78, 238, 248,
249, 250, 253, 257, 258, 262, 264, 271, 287, 291
process • 6, 8,45, 57
radiant • 6, 247, 249, 250, 323
types • 18, 63, 74, 245, 247, 253, 254, 262, 264, 267,
269, 272, 278, 281, 282, 290, 299, 303, 304, 319,
324, 331
Heating systems • 6, 247, 249
Humidity • 3
relative • 4
HVAC • 8, 11, 303, 315, 316, 317, 318, 319
comfort • 8
components • 8
controls • 8
distribution system • 8
filters • 8
humidifiers • 8
HVAC systems • 8, 315, 316, 317, 318
Incineration • 15, 35
catalytic • 204
thermal- 114, 123, 130, 131, 138, 144, 146,165,186,
194,196,204
Industrial assessment (See Assessment) • 1,2, 11, 12, 75
Industrial assessment (See Assessment) • 1, 12, 14, 17
Industrial operations • 4, 5, 87
chemical etching • 79, 148, 149, 150, 152, 153, 154,
172
cleaning and degreasing • 74,116,117,129,132,172,
185
housekeeping • 15, 24, 47, 75, 93, 113, 327
materials management • 93, 94, 103
metal working • 78, 110, 112, 114, 115, 116
office • 5, 74, 87, 88, 89, 90, 94, 177, 210, 226, 227,
230,231,248,258,307
paint application • 172, 173, 179, 184
paint removal • 74,173,184,185,186,188,193,194,
198
plating • 79, 80, 81, 104, 155, 156, 158, 159, 161, 164,
167, 168, 169, 170, 190, 205, 206, 279
printing • 29, 47, 54, 56, 74, 79, 90, 121, 128, 198,
199, 200, 201, 202, 203, 204, 205, 206, 207, 208,
209
waste water treatment • 81, 83
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Index
Installation
costs • 47
Insulation • 8, 15, 21, 72, 296, 297, 298, 299, 300, 302
building • 8, 41, 71, 89, 92, 94, 95, 136, 246, 247, 248,
249, 254, 296, 307, 308, 324, 327, 328, 331
calcium silicate • 300
cold water • 296
dock doors • 299
glass fiber • 300
hot water • 8, 73, 89, 139, 177, 234, 243,246,247,
255, 287, 288, 295, 296, 297, 303
injection mold barrels • 301
low cost • 290
performance • 57, 63, 94, 104, 113, 115, 117, 119,
124, 131, 137, 144, 145, 153, 173, 174, 177, 186,
187, 198, 240, 241, 249, 257, 286, 294, 295, 296,
298
polyisocyanurate • 300
process equipment • 117, 120, 121, 124, 129, 185,
197,246,300
refrigeration • 8
standards • 74, 95, 98, 193, 212, 305, 306, 308, 310,
318,330
steam • 8, 20,24, 46, 61, 67, 72, 73, 82, 89, 107, 144,
146, 234, 235, 236, 242, 243, 244, 247, 248, 254,
255, 256, 257, 258, 287, 288, 289, 290, 291, 295,
296, 297, 303, 305, 328
tanks • 8, 77, 80, 81, 82, 83, 97, 116, 124, 132, 139,
141; 143, 145= 151, 156, 167, 168, 169, 170, 177,
185, 205, 206, 211, 243, 296, 298, 300
thickness- 165,296,297
Internal Rate of Return (IRR) • 25, 50, 51, 52, 54, 58, 59
K
Kerosene • 46
Lamp • 63, 227, 228, 229, 230, 231, 232
fluorescent • 63, 64, 226, 227, 228, 229, 231, 232
high energy discharge • 232
incandescent • 227,231
Liability • 1, 12, 45, 52, 53, 75, 107, 146, 147, 148, 170,
171
Life Cycle Analysis • 4, 48, 51
Life Cycle Costing • 4, 48, 51, 52
raw materials • 52
Lighting • 46, 63, 223, 227, 230,231,233
light meter audit • 226
standards • 74, 223, 226, 229
technologies • 74, 79, 80, 223
Load • 6, 22, 41, 61, 62, 64, 65, 66, 67, 68, 70, 71, 72,
214, 215, 216, 217, 218, 220, 221, 222, 227, 242, 254,
257, 258, 259, 263, 272, 277, 278, 284, 285, 292, 293,
294, 295, 298, 300, 307, 308, 309, 310, 312, 313, 314,
316,327,328,329
essential • 68, 262, 296, 300
287, 290,
,307,310
,217,218,
228, 229,
248, 252,
267, 270,
285, 286,
299,301,
314, 328,
refrigeration • 7, 258, 259, 264, 281,
291, 292, 293, 294, 295, 298, 304
Load factor • 66, 67, 72, 272, 278
savings • 61, 62, 64, 66, 68, 214, 215
219, 220, 221, 222, 223, 226, 227
230, 231, 241, 242, 243, 244, 245
253, 257, 258, 262, 263, 264, 265
271, 272, 274, 275, 277, 278, 279
287, 291, 293, 294, 295, 297, 298
307, 308, 309, 310, 311, 312, 313
331
system analysis • 265
M
Maintenance • 48
costs • 48
Material substitution
case study
chemical substitution in pulp and paper
manufacturing • 33
case study
install an automated aqueous cleaner • 13
metal working fluid substitution • 11
replacing chemical stripping with plastic media
blasting • 29
water-borne paint as a substitute for solvent-
based coatings • 25
Mechanical refrigeration • 8, 281, 287, 290, 295
compression • 234,290,295
condensing pressure • 292, 294
condensing temperature • 292
efficient use • 8, 72, 247
evaporator temperature • 8, 291, 294
heat recovery • 244, 245, 246, 254, 257, 295
hot gas bypass • 8
multiple compressors • 8, 291
pressure • 8
Metalworking • 111, 113
process flow diagram • 18
Motor • 5, 6, 8, 45, 62, 63, 64, 65, 66, 84, 214, 215,
216, 217, 218, 220, 221, 222, 223, 224, 225, 262,
264, 265, 271, 276, 280, 281, 282, 286, 302, 316,
317
synchronous • 65, 66, 221
variable frequency AC • 6, 220
Motors • 46
N
National Pollutant Discharge Elimination System • 4,
74
Natural gas • 6, 12, 14, 21, 32, 40, 46, 54, 61, 71, 72,
241, 245, 248, 249, 250, 251, 254, 257
consumption • 42, 43, 61, 62, 67, 70, 72, 239, 243,
245,251,254,259,305,329
industrial use • 42
service period • 42
Natural Gas • 32
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
-------
Index
Notes
Natural gas bill • 42, 43
example • 42
industrial use • 42
rates • 42
sample • 42
Natural Resources • 52
Net present value • 25, 50
Net Present Value • 49, 57
Nonhazardous waste
containers • 40, 44, 47, 79, 80, 81, 84, 91, 92, 94,
96, 97, 98, 99, 100, 102, 103, 107, 122, 130, 172,
177,203,208
disposal fee • 75
labor • 3, 12, 44, 48, 91, 96, 97, 98, 100, 101, 102,
103, 106, 114, 116, 137, 140, 143, 192, 195,208,
241
transportation • 12, 44, 61, 73, 102, 103, 108, 147,
155
NPDES (See National Pollutant Discharge Elimination
System) • 4, 74
o
Opportunity • 45
analysis • 4, 18, 19, 21, 24, 25, 39, 40, 45, 47, 48,
49, 52, 53, 67, 105, 109, 123, 130, 131, 220, 235,
241, 244, 250, 252, 255, 257, 259, 263, 285, 299,
305
benefits -1,3,11,12, 22, 26, 45, 50, 52, 62, 68, 93,
101, 104, 107, 117, 124, 126, 127, 128, 135, 137,
140, 141, 154, 161, 167, 172, 173, 180, 186, 189,
192, 194, 196, 204, 208, 212, 216, 247, 252, 254
economic • 49
Internal Rate of Return (IRR) • 4, 25, 48, 50, 52,
57,58
economic • 3, 12, 24, 25, 39, 48, 50, 51, 52, 53, 54,
57, 66, 89, 93, 189, 208, 210, 254, 294, 300
Life Cycle Cost (LCC) • 4, 48, 51, 52
Net Present Value • 48
Payback period • 48
Total Cost Accounting • 4, 48, 51, 52
evaluations • 3, 4, 11, 12, 22, 24, 25, 39, 44, 45, 47,
48, 54, 57, 95, 254, 255, 258, 259, 298, 330, 331
examples (See Energy Conservation Opportunities
and Pollution Prevention Opportunities) -218,
234,311,329
identification • 75, 215
payback • 25, 49, 53, 54, 55, 57, 172, 186, 216, 228,
229, 231, 259, 264, 272, 274, 277, 278, 286, 299,
301,330
pollution prevention calculations • 47
Paint application • 74, 80, 81, 144, 148, 172, 173, 176,
179, 184
transfer efficiency • 172, 179, 180, 181, 182, 184
Payback period • 25, 48, 49, 55, 56, 57, 172, 186
peak demand • 66, 67, 68, 72
Peak demand • 67
pesticide management • 14
Plant survey
pumps • 7, 61, 77, 83, 236, 262, 263, 264, 265, 267
techniques • 217, 220, 222, 254, 263
pollution prevention • 1, 2, 3, 5
Pollution prevention • 1, 2, 3, 4, 5, 9, 11, 12, 13, 14, 15,
17, 19, 20, 22, 23, 24, 25, 26, 37, 39, 45, 46, 47, 48,
49, 51, 53, 62, 73, 75, 87, 93, 101, 104, 105, 110, 112,
116, 117, 118, 124, 126, 127, 135, 138, 139, 147, 148,
149, 150, 155, 172, 173, 174, 176, 179, 184, 185, 192,
198,204,212
goals-2, 13, 14,23, 52, 99, 155
hierarchy • 87, 93, 100, 105, 112, 117, 172, 185, 204,
212
methods • 7, 37, 54, 57, 77, 79, 81, 84, 89, 103, 122,
124, 131, 135, 143, 144, 155, 156, 158, 161, 162,
163, 164, 165, 167, 168, 172, 174, 178, 180, 185,
186,193,198,202,209,212
policy-2, 13, 95, 101,104
program • 2, 4, 12, 13, 14, 66, 71, 74, 78, 82, 84, 89,
90, 92, 93, 94, 95, 101, 104, 105, 107, 108, 109,
113,194
regulation • 74
review • 3, 11, 20, 22, 47, 67, 68, 172, 186, 212
tool • 1, 3, 11, 12,14, 15, 24,48, 51, 52, 75, 111, 112,
200
Pollution Prevention Act • 2, 15, 60, 39
Pollution prevention opportunities • 1
case study
chemical substitution in pulp and paper
manufacturing • F-33
closed-loop plating bath recycling process • F-23
construction and demolition waste recycling • F-3
efficient rinsing set-up for chemical etching • F-17
high volume low pressure (hvlp) paint system • F-
27
install an automated aqueous cleaner • F-13
maintenance fluid recycling • F-9
metal working fluid substitution • F-ll
oil analysis program • F-7
on-site recycling • F-3 5
packaging reuse • F-5
plating process bath maintenance • F-21
recycling of cleaner through filtration • F-15
replacing chemical stripping with plastic media
blasting • F-29
waste reduction in the chromate conversion process
•F-19
water-borne paint as a substitute for solvent-based
coatings • F-25
white water and fiber reuse in pulp and paper
manufacturing • F-31
housekeeping • 15, 24, 47, 75, 93, 113
inventory control • 15, 106
material substitution • 57, 105, 173
training • 2, 13,15, 23, 47, 48, 55, 57, 80, 82, 96, 101,
104, 105, 113, 146, 161, 165, 167, 172, 181, 184,
191
Pollution Prevention opportunities
equipment modifications • 133
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Index
Pollution Prevention Opportunities • 36, 37, 38, 87, 93,
105, 112, 117, 149, 156, 172, 185,204,212
POTW • 210
Power demand control • 71
Power factor • 41, 63, 64, 65, 66, 68, 70
correction • 63, 65
improvements • 66
Propane • 46
Psychrometrics • 1
Psychrometry • 305
Pump • 262, 263, 264, 265,266,267,268,282
affinity laws • 264,265,266
centrifugal • 7, 262, 263, 264, 265, 269, 271, 276, 281,
290,291,293,294
curve • 67,263,265, 266, 267,271,294
energy savings • 7, 262, 272, 274, 276, 277, 279, 286,
290, 296, 297, 298, 299, 301
energy usage • 69, 278
installation • 66, 68, 264, 269, 294, 296, 300
power requirements • 65, 285, 286, 293, 294
throttling valve • 277
R
Raw material • 35
usage • 35
Raw materials • 22, 29, 40, 53
RCRA-75, 186, 189
Recycling • 15, 52, 75, 77, 82, 87, 91, 92, 93, 94, 98, 99,
100, 101, 102, 103, 105, 107, 108, 109, 110, 112, 114,
115, 116, 117, 119, 126, 132, 143, 144, 145, 146, 147,
149, 154, 155, 169, 170, 171, 172, 184, 185, 186, 190,
191, 192, 198, 204, 207, 208, 209, 210, 212
case study
closed-loop plating bath recycling process • 23
construction and demolition waste recycling • 3
maintenance fluid recycling • 9
on-site recycling • 35
packaging reuse • 5
recycling of cleaner through filtration • 15
solvent reduction in commercial printing • 38
white water and fiber reuse in pulp and paper
manufacturing • 31
References • 9
aqueous cleaning • 81
chemical etching • 79
machining • 81
painting • 74, 80, 81
plating • 79, 80, 81
printing • 74, 79
solvent cleaning • 80, 81
surface coating • 79
Refrigeration (See absorption or mechanical
refrigeration) • 46, 259, 287, 289, 290, 291, 293, 295
Regulations • 4, 74
Resources • A-9
energy conservation • A-3, A-9, A-46
Energy conservation • A-2
EPA regional offices • A-l
Pollution prevetnion publications • A-3
state • A-9
technology transfer information
nonprofit
state • A-9
state • A-9
technology transfer information sources
government
national • A-9
regional • A-11
state • A-12
non-profit
national • A-3 8
state • A-38
private company
international • A-40
professional association
state • A-42
professional association
international • A-40
national • A-41
trade association
international • A-42
trade association
national • A-43
state • A-51
university
national • A-5 5
state • A-56
technology transfer information sources • A-9
university • A-9
university state • A-9
websites
federal government sites -A-64
technology transfer • A-65
academic resource centers • A-64
affirmative procurement -A- 67
cleaner production • A- 67
compliance assistance • A- 67
energy conservation • 3, 9, A- 46
energy conservation • A- 65
environment, health, and safety • A- 65
ISO 14000 • A- 66
life cycle • A- 49
life cycle analysis • A- 67
plating/finishing • A- 66
pollution prevention • 3, 9
material substitution • A- 59
recycling • A- 59
technical associations, technolgy transfer,
and industry • A- 60
pollution prevention • A- 57
printing • A- 66
state • A- 9
state internet programs • A- 62
reuse • 15, 29
Reuse • 15, 77, 78, 80, 81, 82, 83, 84, 91, 100, 101,
102, 107, 115, 126, 139, 141, 144, 154, 156,209,
212
Reuse (See Recycling) • 24, 78, 79, 83, 84, 90, 93,
100, 102
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Index
Notes
Sanitary and storm sewer • 44, 83, 202, 203,210, 212
discharge fee • 44
labor • 3, 12, 44, 48, 91, 96, 97, 98, 100, 101, 102,
103, 106, 114, 116, 137, 140, 143, 192, 195,208
treatment • 43, 44, 72, 74, 75, 78, 80, 83, 88, 104,
124, 126, 134, 135, 154, 156, 168, 169, 170, 171,
205,210,211,212
SIC • 76, 77, 78, 79, 80, 81, 82, 83, 84, 280
Solid waste • 4, 18,44, 190
labor • 44
tipping fees • 44
transportation • 12, 44, 61, 73, 102, 103, 108, 147,
155
transportation costs • 44
solidification • 15
Solvent- 35, 37, 55, 56, 81, 112, 116, 122, 126, 127,
138, 140, 145, 158, 177, 186, 188,203,213
boiling points • 126, 128
distillation • 15, 51, 109, 110, 120, 124, 126, 127,
138, 144, 145, 146, 156, 186, 187, 198
halogenated • 116, 124, 144, 145, 146, 203
recycling • 75, 77, 82, 87, 91, 92, 93, 94, 98, 99,
100, 102, 103, 105, 107, 108, 109, 110, 112, 114,
115, 116, 117, 119, 126, 132, 144, 145, 146, 147,
149, 154, 170, 172, 184, 185, 186, 190, 191, 192,
198,204,207,208,209,212
Source reduction • 2, 15, 87, 93, 105, 204
case study
efficient rinsing set-up for chemical etching • 17
high volume low pressure (hvlp) paint system •
27
oil analysis program • 7
plating process bath maintenance • 21
Source Reduction • 75, 87, 88, 93, 94, 105, 112, 113,
117, 149, 150, 172, 173, 179, 185, 198,204,212
Space heating • 244
Stabilization • 15
Stratification • 6, 247, 248
Temperature • 20, 21, 236, 250, 284, 285, 287, 289,
292,294,296,312,330
thermal-6, 8,61,73
Thermodynamics • 280
Thermoenergy storage systems • 7
high spot evaluation -258
Total Cost Accounting • 48, 51, 52, 53, 54
Toxic Release Inventory • 14
Treatment • 87, 158, 169, 210
TRI (See Toxic Release Inventory) • 14
V
Variable speed drive -218
Ventilation • 47, 63, 244, 313, 318, 327
design • 236, 240, 248, 252, 254, 282, 285, 286, 292,
293, 294, 295, 296, 303, 305, 307, 308, 309, 310,
313, 315, 316, 317, 318, 319, 329, 330
heat recovery • 244, 245, 246, 254, 257, 295, 330, 331
losses • 7, 62, 63, 66, 70, 83, 84,240,241,243,252,
281,282,292,304,329
air-water mixture • 328
exhaust • 7, 8, 68, 235, 244, 245, 246, 247, 254,
255, 257, 258, 290, 313, 315, 327, 328, 329,
330,331,332
room air • 327, 330
VOC • 79, 80, 81, 84, 119, 129, 173, 174, 176, 177, 178,
179, 204
w
Waste • 3, 11, 13, 20, 22, 24, 43,44, 53, 55, 56, 72, 73,
74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 87, 88, 91,
92, 93, 98, 99, 100, 104, 106, 112, 115, 116, 149, 156,
158, 159, 161, 162, 172, 185, 189, 190, 191, 192, 196,
202, 203, 205, 208, 209, 210, 212, 213, 244, 256, 272,
277
aqueous • 45,77, 81, 117, 118, 119, 124,126,132,
134, 135, 139, 140, 141, 143, 144, 145, 148, 155,
169, 175, 185, 186, 188
assembly • 63, 84, 96, 186, 253
coolant- 78,100,109,112,114, 115
cutting fluid-81, 112, 129
disposal • 12, 15, 20, 40, 43, 44, 47,48, 52, 53, 55, 56,
57, 62, 73, 74, 75, 90, 91, 92, 96, 97, 98, 99, 100,
101, 102, 103, 106, 108, 109, 110, 114, 116, 119,
123, 124, 131, 132, 139, 141, 143, 147, 154, 156,
169, 170, 171, 172, 176, 178, 186, 188, 190, 191,
193, 194, 196, 203, 204, 208, 209
fastening • 84
food processing • 243,244
generation • 12, 13, 35, 45,47, 55, 61, 63, 67, 72, 73,
74, 75, 78, 88, 90, 95, 96, 99, 100, 101, 104, 105,
107, 109, 114, 115, 147, 148, 150, 156, 166, 180,
181, 182, 183, 186, 192, 197, 228, 235, 236, 240,
253, 257, 258, 320
generator • 92, 99, 142, 146, 147, 170, 171, 222, 254,
257,258,289
hazardous • 1, 14, 15, 17, 20, 22, 24, 43, 44, 47, 54,
55, 62, 75, 77, 78, 91, 95, 96, 98, 99, 100, 104, 106,
108, 109, 110, 112, 113, 116, 117, 118, 124, 131,
140, 148, 150, 153, 154, 155, 156, 163, 164, 165,
172, 173, 174, 176, 177, 179, 185, 186, 188, 189,
190, 191, 192, 193, 194, 195, 197,203,204,205,
206,209,212
industries- 111, 116, 154, 155, 156, 182, 197,218,
250, 253
inks • 29, 54, 57, 79, 121, 128, 129,198,199,202,
203, 204, 207, 208
joining • 84
management • 20, 40, 43, 44, 61, 62, 70, 74, 75, 95,
101, 103, 104, 107, 112, 158,223,226,227,254
management costs • 39, 43
material handling • 84, 279
metalworking • 111, 112, 113, 114, 115, 129
minimization • 75, 95, 101, 104,149,150, 156
10
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
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Index
nonhazardous • 117, 118, 206
oils • 77,78,79, 110, 111, 112, 113, 114, 115, 116,
119, 121, 123, 128, 129, 131, 132, 135, 143, 144,
145, 150, 153, 155, 169, 192, 203, 204, 207, 209,
210
operations • 3
paint • 74, 76, 77, 80, 81, 99, 107, 111, 119, 124, 128,
129, 148, 151, 159, 172, 173, 176, 179, 181, 182,
184, 185, 186, 187, 188, 189, 190, 191, 192, 193,
194, 195, 196, 197, 198
paint stripping • 185,186,187,188,189,190,193,
194, 195, 196
painting • 74, 80, 81, 144, 148,173,176,184, 223
printing • 29, 54, 56, 74, 79, 90, 121, 128, 198, 199,
200, 201, 202, 203, 204, 205, 206, 207, 208, 209
process • 45, 57
process description • 3, 18, 19,20, 28, 87, 93, 104,
110, 116, 148, 155, 172, 179, 184, 198
processes • 43, 61, 71, 72, 73, 74, 76, 111, 114, 116,
119, 139, 140, 141, 142, 148, 150, 155, 156, 158,
159, 163, 164, 167, 169, 170, 172, 173, 185, 193,
197, 199, 202, 205, 206, 210, 212, 234, 246, 250,
253, 276, 278, 281, 287, 303, 305, 307
quantities • 74, 87, 95, 104, 115, 128, 181,196,210,
234
record keeping • 4, 147
reduction • 12, 14, 25, 52, 55, 62, 63, 66, 67, 68, 75,
79, 90, 93, 98, 99, 109, 121, 136, 137, 150, 156,
161, 165, 167, 168, 172, 185, 194, 197,206,221,
227, 228, 229, 230, 235, 242, 243, 245, 247, 258,
263, 264, 267, 270, 271, 272, 292, 294, 312, 313,
314,316,328,329,332
regulations • 1, 4, 12, 25, 73, 74, 75, 99, 101, 104,
108, 174, 188
screen printing • 26, 29, 54, 198,199,201,202, 207
solid • 14, 44, 47, 72, 73, 74, 75, 87, 90, 91, 92, 98,
106, 107, 108, 109, 113, 115, 144, 145, 149, 163,
177, 179, 185, 193, 196, 197, 202, 203, 208, 220,
257
solvents • 15, 29, 77, 79, 80, 81, 82,116,117, 119,
120, 121, 123, 124, 126, 127, 128, 129, 131, 132,
140, 141, 143, 144, 145, 146, 147, 156, 158, 164,
170, 172, 174, 175, 176, 177, 178, 179, 185, 186,
188, 190, 198, 199, 202, 203, 206, 207, 332
streams • 18, 107, 167, 170, 188, 192, 246, 251,
281,295,310,331
surface cleaning -155
surface coating • 79, 194
surface preparation • 173, 195, 196
thinners • 144, 172
transportation costs • 44
treatment • 1, 15, 43, 44, 72, 74, 75, 78, 80, 83, 88,
104, 124, 126, 134, 135, 154, 156, 168, 169,
170, 171, 205, 210, 211, 212, 235, 242, 243,
258, 293
types • 5, 18, 63, 74, 87, 96, 105, 108, 119, 124,
126, 140, 142, 144, 146, 148, 149, 170, 173,
179, 180, 181, 185, 189, 190, 191, 194, 197,
198, 200, 202, 210, 211, 216, 218, 228, 229,
231, 232, 245, 247, 253, 254, 262, 264, 267,
269, 272, 278, 281, 282, 290, 299, 303, 304,
319,324,331
wastewater • 20, 74, 88, 95,104,110,120,122,
123, 126, 127, 131, 140, 141, 143, 149, 152,
153, 154, 156, 162, 166, 167, 170, 185, 186,
192, 193, 194, 197, 203, 204, 205, 206, 209,
210,211,212,330
wastewater treatment • 88, 95, 104, 110, 141, 152,
156, 162, 170, 193, 194,203,211,212
Waste minimization • 192
case study
waste reduction in the chromate conversion
process • 19
Wastewater- 110, 134, 135, 140, 141, 143, 156, 190,
192,193, 194,210
activated sludge -212
oxidation • 111, 114, 165,168,209,211,238
treatment • 43, 44, 72, 74, 75, 78, 80, 83, 88, 104,
124, 126, 134, 135, 154, 156, 168, 169, 170,
171, 205, 210, 211, 212, 235, 242, 243, 258,
293
Water
usage • 14
Water conservation • 88
Water vapor • 2
amount in air • 3
Notes
Guide to Industrial Assessments for Pollution Prevention and Energy Efficiency
11
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