EPA/600/R-13/036 | March 2013 | www.epa.gov/gateway/science
United States
Environmental Protection
Agency
State of Technology for Rehabilitation
of Water Distribution Systems
Office of Research and Development
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EPA/600/R-13/036
March 2013
STATE OF TECHNOLOGY FOR REHABILITATION OF
WATER DISTRIBUTION SYSTEMS
by
Robert Morrison, P.E., Tom Sangster, C.Eng., and Dec Downey, Ph.D., C.Eng.
Jason Consultants
John Matthews, Ph.D. and Wendy Condit, P.E.
Battelle Memorial Institute
Sunil Sinha, Ph.D., P.E. and Saumil Maniar
Virginia Tech University
Ray Sterling, Ph.D., P.E.
Trenchless Technology Center
EPA Contract No. EP-C-05-057
Task Order No. 58
Ariamalar Selvakumar, Ph.D., P.E.
Task Order Manager
U.S. Environmental Protection Agency
Urban Watershed Branch
National Risk Management Research Laboratory
Water Supply and Water Resources Division
2890 Woodbridge Avenue (MS-104)
Edison, NJ 08837
National Risk Management Research Laboratory
Office of Research and Development
U.S. Environmental Protection Agency
Cincinnati, Ohio 45268
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DISCLAIMER
The U.S. Environmental Protection Agency (EPA), through its Office of Research and Development,
funded and managed, or partially funded and collaborated in, the research described herein under Task
Order (TO) 0058 of Contract No. EP-C-05-057 to Battelle. It has been subjected to the Agency's peer
and administrative review and has been approved for publication. Any opinions expressed in this report
are those of the authors and do not necessarily reflect the views of the Agency, therefore, no official
endorsement should be inferred. Any mention of trade names or commercial products does not constitute
endorsement or recommendation for use. The quality of secondary data referenced in this document was
not independently evaluated by EPA and Battelle.
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ABSTRACT
The impact that the lack of investment in water infrastructure will have on the performance of aging
underground infrastructure over time is well documented and the needed funding estimates range as high
as $325 billion over the next 20 years. With the current annual replacement rate averaging 0.5%, pipes
would be expected to last for 200 years, but most pipes are designed for 50 or 100 year life cycles. While
this replacement rate may be sufficient in the immediate term because pipes are still relatively young, as
systems grow older, the necessary replacement rates will inevitably increase. In addition to the necessary
funding, congestion above and below ground is making the replacement of water mains more difficult for
utility owners as is the lack of public tolerance for the disruption caused by construction work. There is
an increasing availability of technologies for rehabilitation of existing pipes, which provides solutions
that minimize or alleviate these problems, while providing realistic and potentially cost-effective
alternatives to traditional open cut replacement. The primary objectives of the report are:
• To review current and emerging rehabilitation technologies for water distribution mains and
services.
• To understand the needs of water utilities for renewal of their infrastructure and to identify
technology gaps that should be addressed in order to meet these needs.
• To identify key performance parameters for various rehabilitation technologies and to gather and
document this information for rehabilitation technologies that are available for use in the market.
This report contains a comprehensive review and evaluation of existing and emerging renewal
technologies for water distribution system mains and services. This report covers technologies used for
the repair, rehabilitation, and replacement of water mains and service lines. The available technologies
for water pipeline renewal leave "gaps" in terms of certain needs that are unmet that fall into two main
categories: data gaps in terms of knowledge of the existing pipe condition; and capability gaps in terms of
the available renewal technologies. Accurate data on pipe condition is necessary for the successful
selection and design of renewal technologies. Data gaps relate to the amount and/or quality of direct
physical inspection data on a pipe, which may be obtained either externally or internally. Obtaining
external data requires costly excavation, while internal data can be obtained over the full internal surface
area of the pipe, but this typically requires the main to be shutdown and dewatered.
Capability gaps remain, despite the available rehabilitation technologies generally meeting renewal needs.
Reopening service connections after lining still requires excavation with some technologies at each
connection location and where service connections are frequent; this becomes as disruptive as a full-
length excavation. Operational aspects such as access requirements and the length of time that the main is
out of service are also areas where gaps exist between capability and customers' needs. A gap also
remains in the understanding of the long-term performance of various rehabilitation technologies and
their materials. These materials and methods have been introduced recently and therefore their installed
performance has not been studied over time.
To overcome the gaps identified, it is recommended that innovative rehabilitation technologies be
demonstrated in field conditions and measured against a clearly defined set of performance criteria. An
additional research need is to identify accelerated aging test protocols that would help system owners to
predict the long-term performance of the products and technologies used. It is also recommended that a
retrospective analysis of water main rehabilitation materials be conducted to understand service life
performance of field-installed materials. These data, along with the documented performance evaluation
from a demonstration program, would be essential in providing utility decision makers with the
information needed for selecting technologies and materials that meet their needs.
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ACKNOWLEDGMENTS
This report has been prepared with input from the research team, which includes Battelle, the Trenchless
Technology Center at Louisiana Tech University, Jason Consultants, and Virginia Tech University. The
technical direction and coordination for this project were provided by Dr. Ariamalar Selvakumar of the
Urban Watershed Management Branch. The authors would like to thank the stakeholder group members
(Frank Blaha and Jian Zhang of WaterRF and David Hughes of American Water) for providing written
comments. Sincere appreciation is extended to all of the technology providers who took the time to
review datasheets for their technologies and provide input and contributions so that the information
presented was as current and accurate as possible in the space available within the datasheet format.
IV
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EXECUTIVE SUMMARY
Introduction
This report contains a comprehensive review and evaluation of existing and emerging renewal
technologies for water distribution system mains and services. This report covers technologies used for
the repair, rehabilitation, and replacement of water mains and water service lines. The research team
identified several renewal technologies that are in the early stages of adoption within the U.S. water
distribution rehabilitation industry and are considered to be appropriate targets for inclusion in a
demonstration program. In addition, there is a need to track how rehabilitation systems are performing in
terms of structural deterioration and functionality and hence to assess the expected service life of the
rehabilitated structure. The primary objectives of the report are:
• To review current and emerging rehabilitation technologies for water distribution system mains
and services.
• To understand the needs of water utilities for renewal of their infrastructure and to identify
technology gaps that should be addressed in order to meet these needs.
• To identify key performance parameters for various rehabilitation technologies and to gather and
document this information for rehabilitation technologies that are available for use in the market.
Background
The impact that the lack of investment in water infrastructure will have on the performance of aging
underground infrastructure over time is well documented and the needed funding estimates range as high
as $325 billion over the next 20 years. With the current annual replacement rate averaging 0.5%, pipes
would be expected to last for 200 years, but most pipes are designed for 50 or 100 year life cycles. While
this replacement rate may be sufficient in the immediate term because pipes are still relatively young, as
systems grow older the necessary replacement rates will inevitably increase. In addition to the necessary
funding, congestion above and below ground is making the replacement of water mains more difficult for
utility owners as is the lack of public tolerance for the disruption caused by construction work. There is
an increasing availability of trenchless technologies for rehabilitation and replacement, which provides
solutions that minimize or alleviate these problems while providing realistic and potentially cost-effective
alternatives to traditional open cut replacement.
The financing of water infrastructure and the timely renewal of water pipe is an issue that pipe
rehabilitation may help to address. Water rates are politically sensitive and it is difficult to raise the
necessary funds for improving the condition of water mains. Many water utilities have well developed
repair strategies, and currently find a largely reactive approach cheaper than establishing a proactive,
systematic rehabilitation program. The main driver pushing utilities to undertake rehabilitation work is
the direct and indirect costs associated with cumulative failures in a water main, but there may be an
underappreciated driver that rehabilitation now can lead to a longer life of water mains. Main breaks of
smaller mains for the most part have limited consequence and actually contribute to the difficult task of
condition assessment. Large transmission mains are another story, as major breaks can flood entire areas
of a city with serious and costly consequences and some utilities are now experiencing these types of
breaks for the first time. For most mains, the repeated failure of a pipeline that subsequently leads to
repeated repairs are slow to become economically unfavorable in comparison to rehabilitation or
replacement. The driver for pipe renewal is often the customer's intolerance of repeated or prolonged
downtime.
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Characteristics of Water Mains
Various studies have estimated the size of the U.S. water distribution network from 980,000 to nearly 1.8
million miles of mains. Selection of the pipe materials used for water supply applications is dependent
upon pressure, durability, installation, and water quality approvals such as National Sanitation Foundation
(NSF)/American National Standards Institute (ANSI) Standard 61. Environmental factors such as soil
corrosivity and composition, ground temperature, and groundwater actions are also important.
Until the 1940s, water mains were mainly unlined cast iron (CI) and steel. CI manufacturers turned to
ductile iron (DI) pipe and CI ceased being manufactured altogether in the mid 1980s. Today, more than
40% of all underground water mains are CI pipe. CI pipe is strong (but brittle) and usually offers a long
service life, but it is subject to internal and external corrosion. Internal corrosion (tuberculation) can lead
to water quality issues, reduced flow and pressures, and eventually leakage. CI pipes are also susceptible
to corporation stop failure due to galvanic action, which leads to leakage, and to bending loads induced by
a loss of beam support, which results in circumferential cracks.
DI pipe was introduced to the utility market in 1955 and makes up 22% of water mains in the U.S.
Internal corrosion is prevented by cement mortar lining and by 1975 most DI marketed for water mains
was cement-mortar lined. External corrosion is prevented by wrapping the pipe in a polyethylene film,
bonded coatings, or cathodic protection.
Asbestos cement (AC) pipe was first introduced in North America in 1929 and it was a popular choice for
potable water mains from 1940s to the 1970s. Production ceased in the U.S. in 1983 and it still makes up
16% of U.S. water mains. AC pipe is made of asbestos fibers, silica sand, and Portland cement and is not
subject to galvanic corrosion. However, soft water removes calcium hydroxide from the cement and this
eventually leads to deterioration of the pipe interior (e.g., softening accompanied by the release of
asbestos fibers). External exposure to acidic groundwater or sulfates in the soil can also lead to
deterioration of the cement.
Thermoplastic pipes, in the form of polyvinyl chloride (PVC) initially and then polyethylene (PE), are
also widely used for underground water mains. PVC pipes have been used significantly in U.S. water
distributions systems since the late 1970s and it makes up 13% of the U.S. water mains, while PE makes
up around 0.4% of U.S. water mains. Thermoplastic pipes are not subject to electrochemical or galvanic
corrosion or to internal or external corrosion, and have a high resistance to chemical and biological
degradation. They are, however, subject to permeation and degradation by petroleum hydrocarbons and
may not be suitable for installation in petroleum-contaminated soils.
Other commonly used pipe material used over the years include steel, prestressed concrete cylinder pipe
(PCCP), and glass reinforced polymer (GRP) pipe. Steel pipe is usually used for large diameter or high
pressure applications due to its high strength and rigidity, but is subject to internal and external corrosion.
Internal corrosion can be prevented by various measures such as cement mortar lining and water
treatment, while external corrosion is minimized by wrapping the pipe in a PE film, bonded coatings, or
with cathodic protection. PCCP was first manufactured in the 1940s and consists of a concrete core, thin
steel cylinder, high tensile pre-stressing wires, and a mortar coating. PCCP tends to be larger diameter,
making failure of this pipe relatively catastrophic and costly. GRP pressure pipe for use in potable water
applications is manufactured as a composite of wound glass fibers, resin, filler, and sand applied in
centrifugal and other processes. GRP can be manufactured with various resins including polyester, vinyl
ester, and epoxy.
The failure mechanism of each pipe material varies, which means that rehabilitation solutions must be
tailored to match the problems experienced by a specific pipe material, or be flexible enough to cover a
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multitude of performance problems that may vary depending on operating and environmental conditions.
Each failure mechanism has some indicators that can be measured. An understanding of the failure
modes and their indicators is useful in assessing the condition of the pipe material and selecting the
appropriate timing and type of renewal technique to use.
Renewal Technologies
Renewal of pipes falls into one of three distinct categories (e.g., repair, rehabilitation, and replacement).
Repair techniques are used when the existing pipe can be readily restored to a structurally sound
condition, providing the pipe has acceptable flow capacity and supports good water quality.
Rehabilitation methods include internal coatings, sealants, and linings which are often used to extend
operational life and restore much or all of the pipe's hydraulic capacity and improve water quality. Other
rehabilitation methods are directed at restoring structural functionality. Replacement of an existing pipe
is used when the main is severely deteriorated, collapsed, or increased flow capacity is needed.
Methods used for renewal may be conventional open cut or trenchless technologies. One disadvantage of
some trenchless methods is the need to excavate for reconnection of existing service connections.
Significant reductions in the cost of water main rehabilitation are being achieved with methods that can
reliably reconnect services without further excavation.
Technologies used for repair are typically short-term solutions used for small segments of the pipe and
specifically for localized problems or poor workmanship. These technologies include open cut or
trenchless spot repairs including internal joint seals, pipe sleeves, chemical grouts, spray-on epoxy and
polyurethane coatings, and reinforced carbon fiber pipe wrapping (some of which are structural
solutions). The majority of these techniques were designed for applications other than water main
renewal, but each has ANSI/NSF approval for use in water mains.
Rehabilitation focuses on the renewal aspects of water mains where the existing pipe becomes part of the
renewal work. If the rehabilitation is to provide only corrosion protection, or the existing pipe is only
partially deteriorated, then the remaining structural strength of the existing pipe can be incorporated into
the fabric of the completed system. For fully deteriorated situations, the existing pipe acts merely as a
right-of-way for the installation of the structural liner. The choice of method will largely depend on the
perceived condition of the pipe, project objective, and estimated cost. Rehabilitation technologies include
spray-on linings such as cement mortar, epoxy, polyurea, and polyurethane; segmental and continuous
sliplining; cured-in-place pipe (CIPP) linings; inserted hose linings; and close-fit lining by symmetrical
reduction or fold and form. Pipe bursting can also be considered a rehabilitation method, but is covered
in this report as a replacement method.
A significant component in water distribution system rehabilitation projects concerns service
reinstatement and restoration or replacement of service lines. If a water line runs along one side of a
street, then the service lines to the properties on either side of the street could be renewed quite
differently. Frequently "short side" service lines involve open cut works in sidewalks, yards, and
gardens, whereas "long side" replacements may require lengthy excavations in road pavements and
restoration of costly traffic-bearing surfaces. Renovation of service lines with longer runs may be an
opportunity for a trenchless replacement option such as impact moling or ramming or a trenchless
rehabilitation method such as lining. Traffic impacts and shallow burial may increase the likelihood of
leakage and increase the need for pipe renewal. The technologies available for service line rehabilitation
include epoxy lining and plastic liners, although their use is not common.
Water main replacement is a primary option when a pipe does not have enough structural strength and
becomes prone to failure and where precise condition assessment and residual life estimation may be
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costly or otherwise difficult to implement. These technologies include open cut, pipe bursting, pipe
splitting, pipe reaming, pipe pulling, microtunneling, pipe jacking, pipe ramming, impact moling, and
horizontal directional drilling (HDD). Sliplining can also be considered a method of online replacement,
but is covered in this report as a rehabilitation method.
Service Lines
The service connection typically comprises two sections: the service line from the main to the edge of the
street or easement right-of-way; and the customer line from the right-of-way or street into the customer
premises. In general, the service line is owned by the water utility and the customer line by the property
owner, though some locations place ownership of the service line in the right-of-way on the customer.
An estimated 880,000 miles of piping are used as water service lines in the U.S. These service lines
typically have a diameter of % in. to 2 in. and are typically made of copper, PE, PVC, or polybutylene
(PB). In some older systems, lead service lines still exist, as do galvanized steel (GS) and brass.
On average, copper has shown a life expectancy normally in excess of 75 years and it makes up
approximately 61% of all water services. The rising cost of copper appears to be accelerating a transition
to plastic materials. PE service lines are characterized by their toughness, excellent chemical resistance,
low coefficient of friction, and ease of processing; and they now make up 12% of U.S. water services.
GS service lines, usually found in older homes, are roughly 9% of the U.S. water services. They were
covered with a protective coating of zinc to extend the pipe life expectancy about 40 years, but the
coating generally fails and they corrode inside and out. PVC, making up 6% of U.S. services, is not
subject to corrosion and the surface remains smooth, eliminating tuberculation that can reduce hydraulic
capacity and increase pumping costs. PB pipe was a popular material in the 1970s through the early
1990s. Although PB is corrosion-proof, it has a widespread record of failure possibly owing to its
reaction to chlorinated water, but it still makes up 3% of U.S. water services.
Lead service piping has not been used by most U.S. cities since the 1940s and lead has been banned for
use in plumbing systems since 1986. Depending on site-specific connection details, lead service lines
have a life expectancy of 60 to 75 years; however, because of potential health risks associated with
excessive lead levels in water, it has been replaced in new installations by alternatives such as copper and
PE. The revisions to the Safe Drinking Water Act (SDWA) in 1996 resulted in a reduction of allowable
leaching levels for materials that come into contact with potable water supplies.
In addition to the rehabilitation of the line itself, service lines pose three main issues for rehabilitation
technologies: finding the service connection post-rehabilitation; re-establishing the service opening; and
connecting the service to the liner or carrier pipe. Techniques exist for all three operations, but remain
under development for re-establishing the service connection in order to make them more cost-effective
and reliable. The inability to accomplish these tasks quickly and cost-effectively and to achieve a reliable
watertight connection is a barrier to the greater introduction of trenchless rehabilitation methods for water
mains.
Technology Selection Considerations
For water main renewal, the challenges fall into two categories: assessing the condition of existing pipes
(e.g., defining the problem) and selecting the appropriate technique to restore the pipe condition to a
desired level (e.g., solving the problem). Prior to technology selection, it is important to understand and
define the performance and condition of the water main and to understand the cause of its deterioration.
This will include an evaluation of structural issues, hydraulic capacity, external corrosion, joint leaks,
and/or water quality problems.
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Once the problem is well defined, different solutions can be developed based upon a review of available
technologies that can address the current asset condition and extend the remaining asset life. From there,
the cost required to renew the water main is often the most important technology selection criteria. Cost
calculations for reliable renewal options should include both capital or direct construction costs and life-
cycle costs, which include operation and maintenance (O&M) and social costs. Next, an appropriate
rehabilitation solution should be selected based upon life-cycle costs and other factors such as
maintenance requirements, bypass piping requirements, disinfection requirements, NSF/ANSI 61
requirements, accessibility issues, and criticality of the water main.
Design and Quality Assurance/Quality Control Requirements
Multiple design manuals and regulatory standard specifications exist in the U.S. water utility market from
organizations such as the American Water Works Association (AWWA), ANSI, and American Society of
Testing and Materials (ASTM). Material standard specifications and installation and testing advisories
are sometimes also developed by trade association and industry research organizations. Some standards,
such as ASTM F-1216, incorporate design procedures, while others are used to regulate product
acceptance, installation methodology, or in situ evaluation and acceptance procedures.
Renewal design needs to take into account all of the same structural and hydraulic parameters as new pipe
design, and follows the same codes and standards. Similarly, water quality requirements are the same as
for new pipes. In addition, the interaction with the host pipe and any loads imposed during installation,
especially if using trenchless methods, must also be considered. The normal design life of linings and
renewed pipes is 50 years, so durability aspects such as lasting structural strength and corrosion resistance
also influence design decisions. Similarly, the hydraulic effect of different materials, in terms of surface
roughness, needs to be considered in relation to loss of cross-sectional area when a pipe is lined.
Unfortunately, many of the rehabilitation materials in use today have not been in the ground for 50 years
to verify their true length of life. Partial solutions like semi-structural spray-on linings also rely upon
continued performance of some portion of the original pipe.
Installation of renewal techniques may differ substantially from that of new pipes, so there are specific
installation standards or recommended practices for many techniques, many of which are developed by
technology vendors, industry organizations, and regulators outside North America. Where the installed
pipe or lining is dependent on support from the host pipe as with AWWA Class I, II, and III linings, it is
important that the appropriate installation procedures are followed so that the lining can perform as
designed. This applies equally to non-structural methods such as cement mortar linings (Class I) and
semi-structural (Class II and III) methods. Fully-structural (Class IV) methods do not depend on the host
pipe for support, but the design is still important to ensure the structural criteria are met by the renewal
system.
Quality assurance/quality control (QA/QC) procedures are required and specified in many cases by the
utility owners and basic requirements are enshrined in the product and process specifications developed
by AWWA, ASTM, and vendor organizations. QA in the form of test certificates can be provided by the
manufacturer or by the licensed seller of the product. The contractor in most cases provides a level of
process QC, which may be supervised by third party consultants and testing agencies.
Short-term quality monitoring encompasses compliance checks on raw materials, equipment and
calibration, and on the finished product, often following procedures set out in ANSI, AWWA, and NSF
standards. Long-term quality monitoring may cover water quality, to ensure that the installed materials
are not adversely affecting water quality and the monitoring regime is driven by regulatory compliance.
Similarly, some monitoring of the material performance is necessary to ensure that it continues to perform
through its intended service life and water-tightness is also an aspect that requires long-term monitoring.
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QA is the responsibility of the system owner, the designated project engineer, and the authorized quality
manager or agency. Whether utilizing prescriptive specifications or performance specifications, it is
important that this communication with the installer convey what QA testing will be performed and that
the contract documents establish these requirements as mandatory and specify such remedial measures as
may be necessary. Independent laboratory testing for compliance normally should be under a contract
between the laboratory and the owner, and not between the laboratory and the contractor. Contractually,
there should be a list of known problems that can arise and a specified remedy prescribed that is clear
before the work begins.
Operation and Maintenance
O&M of water networks encompasses many activities that can be affected by rehabilitation. The impact
of O&M on water distribution networks after rehabilitation is widely unknown mainly because of the
young age of water rehabilitation techniques. However, there are essential elements to consider:
• Can the rehabilitated pipe be readily located?
• Can the rehabilitated pipe be controlled (i.e., shutdown) for making future repairs?
• Can future defects (e.g., leaks) be readily identified and pinpointed?
• Can anticipated future connections and controls be installed?
The ability of a utility's repair crews to skilfully carry out emergency repairs on rehabilitated water mains
is another important consideration. There is a demonstrated need for suppliers of linings and similar
technologies to develop repair procedures for their products in water main applications and to train
utilities in their application. In addition, proper cleaning is essential both prior to rehabilitation activities
and during routine operations to improve the capacity and hydraulic performance of water mains. The
selection and use of appropriate cleaning methods can be an important factor in the success or failure of a
water main renewal effort. For example, there is experience that high pressure water jetting can cause
damage to lining systems. Similarly, drag scraping of water mains may damage linings and/or
corporation stops prior to rehabilitation, which makes service reconnection very challenging.
There are several best practices for O&M that can be effective in either prolonging the life of a water
main or allowing a utility to monitor real-time performance so action can be taken as needed to repair,
rehabilitate, or replace the water main before a catastrophic failure occurs. These methods include
cathodic protection, corrosion monitoring, water audits, and leak detection.
Findings and Recommendations
The available technologies for water distribution system renewal offer several benefits to open cut
replacement, but they do leave some "gaps" in terms of certain needs that are unmet. These gaps fall into
two main categories: data gaps in terms of knowledge of the existing pipe condition; and capability gaps
in terms of the available renewal and rehabilitation technologies.
Accurate data on pipe condition is necessary for the successful selection and design of renewal
technologies. Data gaps relate to the amount and/or quality of direct physical inspection data on a pipe,
which may be obtained either externally or internally. Obtaining external data requires excavation for
inspection on the pipe surface, which can be costly and impracticable, although vacuum excavation may
be used to obtain data in a spot location. As a result, the sample size is extremely small and the
confidence level of the findings in terms of being representative of the pipeline as a whole is very low.
Internal data can be obtained over the full internal surface area of the pipe, but this typically requires the
main to be shutdown and dewatered for inspection, which is also costly due to the service interruption,
although some technologies do exit for live inspections.
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The available rehabilitation technologies in the market currently generally meet the required water
distribution system renewal needs, but some capability gaps remain. Reopening service connections after
lining still requires excavation with some technologies at each connection location for manual reopening
and reconnection to the service pipe, often requiring a new fitting. Where service connections are
frequent, this becomes as disruptive as a full-length excavation, thereby negating the benefits of some
trenchless solutions. Operational aspects such as access requirements and the length of time that the main
is out of service are also areas where gaps exist between capability and customers' needs. A gap also
remains in the understanding of the long-term performance of various rehabilitation technologies and
their materials. These materials and methods have been introduced recently and therefore their installed
performance has not been studied over time.
To overcome the barriers and gaps identified, it is recommended that innovative rehabilitation
technologies be demonstrated in field conditions and measured against a clearly defined set of
performance criteria, which can inform water utilities of the capabilities, applicability, and costs of
innovative technologies. An additional research need is to identify accelerated aging test protocols that
would help system owners to predict the long-term performance of the rehabilitation products and
technologies that are emerging in the market and to identify appropriate design and performance
standards for their use. It is also recommended that a retrospective analysis of water main rehabilitation
materials be conducted to understand service life performance. A retrospective study of materials in use
for up to 20 years or more can provide data on the performance of field-installed materials. These data,
along with the documented performance and applicability evaluation performed under a demonstration
program, would be essential in providing utility decision makers with the information they need for
selecting the proper technologies and materials to meet their system needs.
XI
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TABLE OF CONTENTS
DISCLAIMER ii
ABSTRACT iii
ACKNOWLEDGMENTS iv
EXECUTIVE SUMMARY v
TABLE OF CONTENTS xii
LIST OF FIGURES xvii
LIST OF TABLES xviii
DEFINITIONS xx
ABBREVIATIONS AND ACRONYMS xxi
1.0: INTRODUCTION 1
1.1 Project Background 1
1.2 Project Objectives 1
1.3 Project Approach 2
1.4 Organization of Report 2
2.0: BACKGROUND 4
2.1 Current Utility Practices 4
2.2 Current Market 6
3.0: CHARACTERISTICS OF WATER MAINS 8
3.1 Pipe Materials 8
3.1.1 Material Usage 8
3.1.2 Applicability 9
3.1.2.1 Cast Iron Pipe 9
3.1.2.2 Ductile Iron Pipe 9
3.1.2.3 Asbestos Cement Pipe 10
3.1.2.4 Thermoplastic Pipe 10
3.1.2.5 Steel Pipe 11
3.1.2.6 Prestressed Cylinder Concrete Pipe 11
3.1.2.7 Glass Reinforced Plastic Pipe 11
3.2 Pipe Failure Modes 12
4.0: RENEWAL TECHNOLOGIES 14
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4.1 Repair 16
4.1.1 Open Cut Repair 17
4.1.2 Spot or Localized Repairs 17
4.1.2.1 QuakeWrap™ 17
4.1.2.2 Tyfo" FibrWrap" Systems 18
4.1.2.3 CarbonWrap™ 19
4.1.2.4 A+Wrap™ 19
4.1.2.5 Frey-CWrap" 20
4.1.2.6 Hydro-Seal™ 21
4.1.2.7 Epoxy Coatings 21
4.1.2.8 Polyurethane Coatings 22
4.1.2.9 Joint Repairs 23
4.2 Rehabilitation 24
4.2.1 Spray-On Linings 25
4.2.1.1 Cement Mortar Lining 26
4.2.1.2 Epoxy Lining 28
4.2.1.3 Polyurea Lining 29
4.2.1.4 Polyurethane 30
4.2.2 Sliplining 30
4.2.2.1 Segmental Sliplining 30
4.2.2.2 Continuous Sliplining 31
4.2.3 Cured-in-Place Pipe 32
4.2.3.1 InsituMain" 34
4.2.3.2 Aqua-Pipe" 35
4.2.3.3 NORDIPIPE™ 35
4.2.3.4 Starline"2000/HPL-W 36
4.2.4 Inserted Hose Lining 37
4.2.4.1 Thermopipe" 37
4.2.4.2 Primus Line" 39
4.2.5 Close-Fit Lining 39
4.2.5.1 Fold and Form Close-Fit Liners 41
4.2.5.1.1 Subterra Subline 41
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4.2.5.1.2 InsituGuard -Folding 41
4.2.5.2 Symmetrical Reduction/Reduced Diameter Pipe 42
4.2.5.2.1 Swagelining™ 42
4.2.5.2.2 Subterra Rolldown 43
4.2.5.2.3 Tite Liner" 44
4.2.5.2.4 InsituGuard" - Flexing 45
4.2.5.3 Other Close-Fit Liners 45
4.2.5.3.1 Duraliner™ 45
4.2.5.3.2 MainSaver™ 46
4.2.5.3.3 Aqualiner 47
4.2.6 Service Line Rehabilitation 47
4.2.6.1 Nu Flow Technology 47
4.2.6.2 Flow-Liner Neofit Process 47
4.2.6.3 Deposition of Calcite Lining 48
4.3 Replacement 48
4.3.1 Trenched (Open Cut) Replacement 49
4.3.1.1 Narrow Trench Construction 49
4.3.1.2 Wide Trench Construction 49
4.3.2 Trenchless Replacement 50
4.3.2.1 Pipe Bursting 50
4.3.2.2 Pneumatic Pipe Bursting 50
4.3.2.3 Hydraulic Pipe Bursting 51
4.3.2.4 Static Pipe Bursting 51
4.3.2.5 Pipe Splitting 52
4.3.2.6 Pipe Reaming 52
4.3.2.7 Pipe Pulling 52
4.3.2.8 Microtunneling and Pipe Jacking 53
4.3.2.9 Pipe Ramming 54
4.3.2.10 Impact Moling 55
4.3.2.11 Horizontal Directional Drilling 56
5.0: SERVICE LINES 57
5.1 Characteristics of Service Lines 57
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5.1.1 Service Line Materials 57
5.1.1.1 Copper 57
5.1.1.2 Polyethylene 58
5.1.1.3 Galvanized Steel 58
5.1.1.4 Polyvinyl Chloride 59
5.1.1.5 Lead 59
5.1.5.6 Polybutylene 60
5.1.5.7 Other Service Line Materials 60
5.1.2 Ownership and Legal Issues 60
5.1.2.1 Property Access Issues 61
5.1.2.2 Funding Issues 61
5.2 Renewal of Service Lines 62
5.3 Reconnection of Service Lines 62
5.3.1 Finding the Service Connection 62
5.3.2 Re-establishing the Opening 63
5.3.3 Connecting the Service Line to the Liner or Carrier Pipe 63
6.0: TECHNOLOGY SELECTION CONSIDERATIONS 64
6.1 Defining the Problem 65
6.1.1 Structural Problem 65
6.1.2 Hydraulic Capacity 66
6.1.3 External Corrosion 67
6.1.4 Joint Leaks 67
6.1.5 Water Quality 67
6.1.5.1 Sedimentation 67
6.1.5.2 Encrustation 68
6.1.5.3 Fouling 68
6.2 Capital Costs 68
6.3 Life-Cycle Costs 69
6.4 Maintenance Requirements 69
6.5 Bypass Piping System Requirements 70
6.6 Disinfection Requirements 71
6.7 NSF/ANSI 61 Requirements 72
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6.8 Accessibility Issues 73
6.9 Asset Criticality 73
7.0: DESIGN AND QA/QC REQUIREMENTS 74
7.1 System Design 74
7.2 Renewal Design 74
7.2.1 Pressure and Stiffness Rating 75
7.2.2 Durability 75
7.2.3 Corrosion Resistance 76
7.2.4 Smoothness of Inner Surface 76
7.2.5 Ease of Tapping and Repair 76
7.2.6 Water Quality Maintenance 76
7.3 Product Standards 76
7.4 Installation Standards 77
7.4.1 Cement Mortar Lining 78
7.4.2 Polymer Spray Linings 78
7.4.3 Sliplining 78
7.4.4 Close-Fit Lining: Symmetrical Reduction 78
7.4.5 Close Fit Lining: Fold and Form 78
7.4.6 Cured-in-Place-Pipe 78
7.4.7 Woven Hose Lining 79
7.5 QA/QC Requirements 79
7.5.1 Short-Term Quality Monitoring 79
7.5.2 Long-Term Quality Monitoring 80
7.5.2.1 PVC Long-Term QA/QC Requirements 80
7.5.2.2 PE Long-Term QA/QC Requirements 80
7.5.2.3 CIPP Long-Term QA/QC Requirements 80
8.0: OPERATION AND MAINTENANCE 81
8.2 Cleaning Methods 81
8.2.1 Water Jetting 82
8.2.2 Pipeline Pigs 82
8.2.3 Drag Scrapers 82
8.2.4 Power Boring 83
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8.3 Cathodic Protection 84
8.3.1 Impressed Current 84
8.3.2 Corrosion Inhibitors 84
8.4 Corrosion Monitoring 84
8.4.1 Indirect Methods 84
8.4.1.1 Customer Complaint Logs 84
8.4.1.2 Corrosion Indices 85
8.4.1.3 Water Sampling and Chemical Analysis 85
8.4.2 Direct Methods 86
8.4.2.1 Examination of Pipe Sections 86
8.4.2.2 Rate of Wall Loss Measurements 86
8.5 Water Audits and Leakage Detection 86
9.0: FINDINGS AND RECOMMENDATIONS 88
9.1. Gaps between Needs and Available Technologies 88
9.1.1 Data Gaps 88
9.1.2 Capability Gaps 88
9.1.3 Benefits, Costs, and Challenges in Closing Gaps 89
9.2 Conclusions and Recommendations 90
10.0: REFERENCES 91
APPENDIX A: TECHNOLOGY DATASHEETS 1
LIST OF DATASHEETS 2
APPENDIX A: TECHNOLOGY DATASHEETS
LIST OF FIGURES
Figure 2-1. Historical and Projected Age of Water Pipes in the U.S 5
Figure 2-2. Estimated Pipe Condition in 20-Year Spans 6
Figure 3-1. Classification of PCCP Pipes 11
Figure 3-2. Factors Contributing to Pipe Failures 13
Figure 4-1. Renewal Approaches for Water Mains 15
Figure 4-2. Application of QuakeWrap™ 18
Figure 4-3. Wrapping Large Diameter Mains with Tyfo® FibrWrap® System 18
Figure 4-4. Options of CarbonWrap™ 19
Figure 4-5. Application of A+Wrap 20
Figure 4-6. Frey-CWRAP Material and Robotic Repair 20
Figure 4-7. Cross Section of Stainless Steel Pipe Sleeve 21
Figure 4-8. Belzona® 5811DW on a Concrete Surface 22
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Figure 4-9. Polyurethane Lining by SprayWall® 22
Figure 4-10. Application of aHydraTite Retaining Bands 23
Figure 4-11. Rehabilitation Approaches for Water Mains 24
Figure 4-12. Summary of Spray-On Lining Technologies 26
Figure 4-13. Spiniello Projectile Rig for CML 26
Figure 4-14. Dakota Pipelining Centrifugal Small Diameter Rig 27
Figure 4-15. Dakota Pipelining Large Diameter Projectile Method 27
Figure 4-16. 3M Scotchkote™ 169HB Lining 29
Figure 4-17. Acuro Polymeric Resin Lining 29
Figure 4-18. Summary of Sliplining Technologies 30
Figure 4-19. Segmental Sliplining using HOBAS Pipe 31
Figure 4-20. Continuous Sliplining by Fusible PVC® 31
Figure 4-21. Summary of Cured-in-Place Pipe Technologies 33
Figure 4-22. Cross Section of InsituMain® 34
Figure 4-23. Aqua-Pipe® Cross Section 35
Figure 4-24. NordiPipe™ Cross Section 36
Figure 4-25. Starline HPL-W Cross Section 37
Figure 4-26. Thermopipe® Cross Section 38
Figure 4-27. Installation of Thermopipe® 38
Figure 4-28. Primus Line® 39
Figure 4-29. Summary of Close-Fit Lining Technologies 40
Figure 4-30. Section of Subline 41
Figure 4-31. InsituGuard® - Folding Apparatus and Restraining Bands 42
Figure 4-32. Swagelining™ Process 43
Figure 4-33. Rolldown Process 44
Figure 4-34. Tite Liner® Roller Reduction Box 44
Figure 4-35. InsituGuard® - Flexing Roller Reduction Machine 45
Figure 4-36. Butt-Fusion Welding of Duraliner™ 46
Figure 4-37. Cross Section of MainSaver™ 46
Figure 4-38. Neofit Liner, Before and After Inflation 48
Figure 4-39. Summary of Replacement Technologies 49
Figure 4-40. Pneumatic Pipe Bursting 50
Figure 4-41. Hydraulic Pipe Bursting Head 51
Figure 4-42. Static Pipe Bursting 52
Figure 4-43. Hydros™ Plus 53
Figure 4-44. EPB Machine 53
Figure 4-45. Summary of Pipe Jacking Technologies 54
Figure 4-46. Pipe Ramming Under a Railroad 55
Figure 4-47. Impact Moling Tool 55
Figure 4-48. HDD Rig 56
Figure 5-1. Copper Piping 58
Figure 5-2. Corrosion Failure of Galvanized Steel Pipe Coupling 59
Figure 6-1. Technology Selection for Water Main Rehabilitation 64
Figure 6-2. A Typical Layout of Bypass Piping 71
Figure 8-1. Winch Cable with Drag Scrapers Attached 83
Figure 8-2. Example of a Rack Feed Bore Head 83
LIST OF TABLES
Table 2-1. Increasing Per Capita Use of Treated Drinking Water 4
Table 3-1. Water Distribution Systems by Material 8
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Table 3-2. Water Distribution Systems by Diameter 8
Table 3-3. Water Distribution Systems by Age 9
Table 4-1. Summary of Renewal Technologies for Water Distribution Systems 15
Table 4-2. Various Rehabilitation Techniques 25
Table 5-1. Types of Service Line Materials 57
Table 5-2. Summary of Renewal Technologies for Service Lines 62
Table 6-1. Water Main Inspection Methods and Methodologies 66
Table 6-2. Summary of Rehabilitation Method Order of Magnitude Costs 69
Table 7-1. Key Parameters for Renewal Design 77
Table 7-2. Short-Term QA/QC Standards 79
Table 8-1. Summary of Cleaning Methods Available to a Water Utility 82
Table 8-2. Various Categories of Leaks in a Network 87
Table 8-3. Various Leak Detection Techniques 87
Table 9-1. Benefits, Costs, and Challenges in Closing Gaps 89
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DEFINITIONS
Cement mortar lining (CML) - A technique that spray applies a cementitious based lining to the interior
surface of a pipe in need of non-structural rehabilitation.
Cured-in-place pipe (CIPP) - A hollow cylinder consisting of a fabric tube with cured thermosetting
resin. The CIPP is formed within an existing pipe and takes the shape of the pipe.
Folded pipe - Pipe that has been manufactured and calibrated in a round shape, and then subsequently
cooled and deformed into a folded shape for insertion into the existing pipe.
Partially deteriorated pipe - The existing pipe can support the soil and surcharge loads throughout the
design life of the pipe, but the soil adjacent to the existing pipe must provide adequate side support.
Fully deteriorated pipe - The existing pipe is not structurally sound and cannot support soil and live
loads, or it is expected to reach this condition over the design life of any rehabilitation.
Joint repairs - A technique that uses mechanical systems for internal joint sealing or repair systems that
inject grouts through leaking joints.
Pipe bursting - A process that utilizes equipment to fracture brittle pipe materials and split ductile pipe
materials and displace the old pipe into the soil while forming a cavity in the soil sufficiently large
enough to place a new pipe of equivalent or larger size in the space formerly occupied by the old pipe.
Reduced diameter pipe - Pipe that is shaped on site for insertion and then reshaped to form a close-fit
liner.
Renewal - The application of infrastructure repair, rehabilitation, and replacement technologies to return
functionality to a drinking water distribution system or a wastewater collection system.
Repair - A technique is typically a spot restoration used when the majority of the existing pipe is
structurally sound, except in some spot locations.
Rehabilitation - Internal coatings, sealants, and linings used to extend operational life and restore much or
all of the pipe's hydraulic and structural functionality.
Replacement - An existing pipe is usually replaced when it is severely deteriorated, collapsed, or
increased flow capacity is needed.
Sliplining - The installation of a smaller-diameter replacement pipe inside an existing pipe, leaving an
annular gap between the two. The replacement pipe can be continuous or made up of discrete segment
lengths. It may be considered a replacement rather than rehabilitation.
Spray-on polymeric lining - A technique that spray applies a polymeric (e.g., epoxy, polyurethane, or
polyurea) based lining to the interior surface of a pipe in need of rehabilitation.
Trenchless technology - A family of techniques that allow installation and rehabilitation of buried utilities
without the need to excavate a continuous trench to access the utility.
Open cut - Excavation from the surface to install or rehabilitate a buried utility.
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ABBREVIATIONS AND ACRONYMS
AC asbestos cement
ACI American Concrete Institute
AI Aggressivity Index
ANSI American National Standards Institute
ASCE American Society of Civil Engineers
ASME American Society of Mechanical Engineers
ASTM American Society of Testing and Materials
AWWA American Water Works Association
AWWARF American Water Works Association Research Foundation
BNQ Bureau de Normalisation du Quebec
BS British Standards
CCFRPM centrifugally cast fiberglass reinforced polymer mortar
CCTV closed circuit television
CFR Code of Federal Regulations
CFRP carbon fiber reinforced polymer
CHIP controlled head inversion process
CI cast iron
CIPP cured-in-place pipe
CML cement mortar lining
CO2 carbon dioxide
CSO combined sewer overflow
DI ductile iron
DIPRA Ductile Iron Pipe Research Association
DIPS ductile iron pipe standard
DOT U.S. Department of Transportation
DR Dimension Ratio
DVGW Deutscher Verein des Gas- und Wasserfaches
ECP embedded cylinder pipe
EES Economic and Engineering Services
EPA U.S. Environmental Protection Agency
EPB earth pressure balance
EPDM ethylene propylene-diene modified
FRP fiberglass reinforced plastic
GAO Government Accounting Office
GIS geographic information systems
gpm gallon per minute
GRP glass reinforced polymer/plastic
GS galvanized steel
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HDB hydrostatic design basis
HDD horizontal directional drilling
HOPE high density polyethylene
HDS hydrostatic design stress
ID Inner Diameter
US intermediate jacking stations
IPS iron pipe size
ISO International Organization for Standardization
LCP lined cylinder pipe
LSI Langelier Saturation Index
MDPE medium density polyethylene
MFL magnetic flux leakage
NACE National Association of Corrosion Engineers
NIPDWR National Interim Primary Drinking Water Regulations
NPDWR National Primary Drinking Water Regulations
NRC National Research Council
NRMRL National Risk Management Research Laboratory
NSF National Sanitation Foundation
O&M Operation and Maintenance
OD Outside Diameter
OSHA Occupational Safety and Health Administration
PAP polyethylene -aluminum-polyethylene
PB polybutylene
PCCP prestressed concrete cylinder pipe
PE polyethylene
PHC petroleum hydrocarbons
PPI Plastic Pipe Institute
PPL Pressure Pipe Liner
PPM Progressive Pipeline Management
PU polyurethane
PVC polyvinyl chloride
PWAP Pipe Wrap A+ Wrap™
QA/QC quality assurance/quality control
RCP reinforced concrete pipe
SDR standard dimension ratio
SDWA Safe Drinking Water Act
SOT state-of-technology
SRF State Revolving Fund
SSO sanitary sewer overflow
TO Task Order
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UL Underwriter Laboratories
UV ultraviolet
VOC Volatile organic compounds
WaterRF Water Research Foundation
WRAS Water Regulations Advisory Scheme
WRc Water Research Center
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1.0: INTRODUCTION
The U.S. Environmental Protection Agency's (EPA's) Aging Water Infrastructure Research Program
directly supports the Agency's Sustainable Water Infrastructure Initiative. Within this program, scientific
and engineering research is being conducted to evaluate promising innovative technologies that can
reduce costs and improve the effectiveness of operation, maintenance, and replacement of aging and
failing drinking water distribution and wastewater conveyance systems (EPA, 2007a). Task Order (TO)
58 under EPA STREAMS Contract No. EP-C-05-05758 involved a comprehensive review and evaluation
of existing and emerging renewal technologies for water distribution systems.
1.1 Project Background
This state-of-technology (SOT) report is one of three SOT reports (see EPA, 2010a and 2010b) prepared
under TO 58. This report covers the rehabilitation of drinking water infrastructure including water mains
and service lines. The companion reports cover separately the SOT for wastewater collection systems and
sewer force mains, respectively. This more detailed report follows a previously released State of
Technology Review Report on Rehabilitation of Wastewater Collection and Water Distribution Systems
(EPA, 2009) that provided a brief overview of the current state-of-the-practice and current state-of-the-art
for rehabilitation of pipes and structures within the wastewater collection and water distribution system
and discussed the common issues needing improvement that apply to both water and wastewater
applications.
During the course of TO 58 activities, including a technology forum and the preparation of the SOT
reports, the research team identified several renewal technologies that are in the early stages of adoption
within the U.S. water industry. These technologies are considered to be appropriate targets for inclusion
in a field demonstration program of emerging and innovative trenchless technologies for water network
rehabilitation. The demonstrations will provide an opportunity for third-party documentation of the
application of new technologies and capture the design and installation data that will be important later in
tracking the deterioration rates for the rehabilitated structure. These field trials are meant to illustrate the
overall technical approach to the evaluation and acceptance of a novel or emerging technology in an effort
to lower the risk for water utilities in implementing new technologies and processes in their networks.
The technology forum also reinforced a key need in applying asset management principles to water and
wastewater systems - the need to track how the rehabilitation system is performing in terms of structural
deterioration and functionality and hence to assess the expected service life of the rehabilitated structure.
A significant volume of treated, potable water is lost to leakage and main breaks and the cost of the lost
water itself is an increasing concern, which adds to the true costs of allowing a distribution system to
deteriorate.
Renewal of distribution pipes is carried out by various technologies, allowing them to successfully fulfill
their purpose of transmission or distribution. Innovative contractors and pipe manufacturers have
developed various trenchless technologies for permanently correcting or controlling water main failures.
For example, structural liners can be used for pipes with a history of breakages, while a non-structural
liner may be suitable for corrosion protection of structurally sound pipes.
1.2 Project Objectives
The project aims to understand the repair, rehabilitation, and replacement technologies for water mains
and water services available to water utilities. Recently, there has been a significant increase in the range
and type of rehabilitation technologies available for water mains in the market, but only limited adoption
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to date has taken place. The scope of this project is to provide an overview of key technical parameters to
assist water utilities in identifying and selecting commercially available rehabilitation/repair technologies
for deployment in the field. Therefore, the main objectives of the report are to:
• Review current and emerging rehabilitation/repair technologies for water distribution system
mains and services.
• Understand the needs of water utilities for renewal of their pipeline infrastructure and to identify
technology gaps that should be addressed in order to meet these needs.
• Identify key performance parameters for various rehabilitation/repair technologies and to gather
and document this information for rehabilitation technologies that are available for use in the
market.
1.3 Project Approach
The research team reviewed available rehabilitation technologies in the water utility market for both water
mains and service lines. As part of the review, the researchers documented key technical parameters
associated with each technology including:
• Technical application parameters;
• Design standards;
• Case studies;
• Acceptance and use data;
• Quality assurance/quality control (QA/QC) requirements;
• Installation methods and standards; and
• Costs and key costing factors.
The rehabilitation of a water main is also not an individual event in itself. The sequence of activities in a
water main rehabilitation program can be complex. Several site preparation tasks such as cleaning,
drying, and setting up bypass piping precede the rehabilitation, while other activities such as verification,
inspection, and disinfection prior to a return to service follow the rehabilitation. The conduct of these
various activities can have significant bearing on the success or failure of the selected repair or
rehabilitation technology and these issues are also reviewed in this report.
1.4 Organization of Report
• Section 2 describes the current state of renewal practices by water utilities.
• Section 3 discusses the common characteristics and pipe materials used in the nation's drinking
water infrastructure systems. It highlights the advantages and disadvantages of each, including
their frequency of use in the distribution/transmission network. Failure modes of these pipes are
also provided in this section.
• Section 4 identifies and describes the renewal technologies that are currently available for water
infrastructure repair, rehabilitation, and replacement of water mains and service lines.
• Section 5 similarly discusses the characteristics of service lines in water infrastructure.
• Section 6 covers technology selection considerations for choosing renewal techniques.
• Section 7 briefly reviews designs and standards used in the water industry and introduces QA/QC
requirements from the perspective of the manufacturers and licensed vendors.
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Section 8 covers operation and maintenance (O&M) activities, which can be used to extend the
life of existing pipe assets and drives the need for future repair, rehabilitation, and replacement
activities.
Section 9 provides a compilation of gaps between needs and available technologies and provides
recommendations to further the widespread use of renewal technologies in water utilities.
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2.0: BACKGROUND
Numerous studies have reported on the impact that the lack of investment will have on the performance of
the aging underground infrastructure over time. For example, the American Water Works Association
(AWWA) previously estimated that there were more than one million miles of water mains serving 273
million people in the U.S., and that $325 billion would have to be spent over a 20-year period to revitalize
the aging underground infrastructure (AWWA, 200la). The Government Accounting Office (GAO)
stated that 33% of water utilities did not adequately maintain assets and a further 29% had insufficient
revenues to even maintain current water service levels (GAO, 2002). The EPA report The Clean Water
and Drinking Water Infrastructure Gap Analysis attempted to reach a common quantitative understanding
of the potential magnitude of investment needed to address growing population and economic needs
(EPA, 2002). It highlighted the concerns of increasing per capita usage of treated drinking water from the
year 1950 to the year 2000, as shown in Table 2-1, combined with a 159% growth in population, which
led to about a 207% growth in drinking water usage (EPA, 2002).
Table 2-1. Increasing Per Capita Use of Treated Drinking Water
Population (Millions)
Usage (Billions of Gallons per Day)
Per Capita Usage (Gallons per Person per Day)
1950
93.4
14
149
2000
242
43
179
Percent Change
159%
207%
20%
The annual American Society of Civil Engineers (ASCE) Infrastructure Report Card 2009 assigned a 'D-'
rating to the nation's drinking water infrastructure. A shortfall of at least $11 billion in annual worth is
what is estimated to replace the aging water infrastructure just to comply with existing and future federal
water regulations and without taking into account growth in the demand for drinking water over the next
20 years (ASCE, 2009). ASCE also indicates that leaking pipes lose an estimated 7 billion gallons of
clean drinking water per day, which is around 15% of the daily drinking water usage.
2.1
Current Utility Practices
Water utilities in the U.S. currently replace about 0.5% of their pipeline assets each year, with individual
programs typically ranging from 0 to 1.5% per year (AWWA, 1998). As a long-term rate, this appears
inadequate since most experts do not expect the average water main to last 200 years. In the near term,
this replacement rate may be sufficient, but only because most pipes within the water distribution network
are relatively young. However, as systems grow older, replacement rates will increase dramatically.
Congestion both above and below the ground is making the replacement of water mains more difficult.
Due to utility congestion, it is becoming increasingly difficult to find space within many rights-of-way for
new pipelines. It is equally difficult to find enough space in many public thoroughfares to perform the
construction, due to traffic congestion. Public tolerance for the disruption caused by construction work is
also diminishing.
Pipeline rehabilitation has the potential to alleviate some of these problems. For the past 20 years, utility
managers have had two basic options when it came to pipeline infrastructure issues: fix leaks or replace
pipes, both of which were largely reactive in nature. Also, there were only a few options available for
extending the life of a pipe, but with technological advances that is changing. It is now possible to assess
pipelines and perform their repair and/or rehabilitation through excavations at both ends of a section of
pipeline rather than excavating the entire length of pipe. However, with more tools and choices, the
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management decisions are not necessarily getting any easier since more options require the understanding
of the applicability of the increasing number of techniques.
Unless significant action is taken quickly, the problem will worsen as the average pipe age continues to
increase without significant replacement or renewal. As shown in Figure 2-1, the average pipe age in
2000 was about 38 years, but by the year 2050 the average pipe age will be more than 50 years. This is
because of the boom in water pipeline installations that took place after World War II. From 1870 to
1945, less than 20,000 miles of pipe was installed each decade; however, after 1945, this rate increased to
over 80,000 miles of pipe per decade (EPA, 2002).
I
,c
O)
O)
100
90
80
70
50
40
30
20
10
0
iitlttttfl
Figure 2-1. Historical and Projected Age of Water Pipes in the U.S.
The U.S. water distribution industry has an environment that is very different from the wastewater
collection industry when it comes to the amount of rehabilitation undertaken or even contemplated.
Formal enforcement action by the EPA on communities with excessive combined sewer overflows
(CSOs) and sanitary sewer overflows (SSOs) during wet weather has been a driver of action for the
wastewater industry. For example, the threat of fines for overflows or spills is driving many communities
to undertake infiltration and inflow (I&I) reduction programs that often involve some form of sewer main
rehabilitation. Without the threat of such costly external enforcement actions, the political environment in
many communities would make it difficult to raise the necessary funds to improve the condition of the
wastewater system to an acceptable level of performance. Water systems also are more difficult to
inspect and require expensive and time consuming temporary services and disinfection in connection with
rehabilitation. With well-developed repair strategies, many water utilities currently find a largely reactive
approach cheaper (in the short term) than establishing a systematic rehabilitation program.
The Clean Water and Drinking Water Infrastructure Gap Analysis stated the need for an improved
decision-making process for maintaining, upgrading, and expanding infrastructure (EPA, 2002). The
relationship between O&M needs and capital stock is not fully understood. Clean water and drinking
water systems will incur significant costs due to deteriorating pipes over the next 20 years at the same
time as they expand capacity to serve current and future growth, as shown in Figure 2-2 (EPA, 2002).
This analysis would benefit from research into an array of factors that ultimately will determine, or at
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least influence, the scale of future capital investment needs. These factors will also determine how future
capital investment needs are met. These factors include asset management processes, restructuring to
gain economies of scale, understanding elasticity of demand for water, demographic shifts, efficiency in
latest technologies, operating trends, criticality analysis, and the effects of non-like-for-like replacement
of assets or repair and rehabilitation options.
(3%) Poor
(3%) Fair
Very Poor (2%)
. , Life Elapsed (5%)
Very Poor (2%)
\ 7 Life Elapsed (7%)
.Life Elapsed (9%)
(13%) Poor
(12%) Fair
Good (11%)
1980
2000
2020
Figure 2-2. Estimated Pipe Condition in 20-Year Spans
2.2
Current Market
Approximately 160,000 public water systems in the U.S. are subject to the Safe Drinking Water Act
(SDWA) - a Federal law (EPA, 2009). The SDWA requires the EPA to establish National Primary
Drinking Water Regulations (NPDWR) for contaminants. Mandatory maximum contaminant levels and
non-enforceable maximum contaminant level goals are established by EPA. The 1996 Amendment to the
SDWA established the Drinking Water State Revolving Fund (SRF). States can use the funds to help
water systems make infrastructure improvements or assess and protect source water. The amount of
money allocated to the revolving funds has decreased over the years with the result being that the amount
of money available in the SRF is low compared with the amount needed to rebuild the water
infrastructure.
States have administrative penalty authority, and many types of formal enforcement action are possible.
However, fines are small in comparison to those for wastewater overflows, so utility efforts tend to focus
more on source water and treatment issues than on distribution and transmission improvements. For
example, service interruptions as a result of failure, inadequate flow or low pressure, all of which can be
very upsetting to the utility customer, do not warrant enforcement action under the SDWA.
The main driver pushing utilities to undertake any rehabilitation work on their underground water
infrastructure is the direct and indirect cost associated with cumulative failures in a water main, but there
may be an underappreciated driver that rehabilitation now can lead to a longer life of water mains. As an
example, Cleveland, Ohio has experienced two breaks in a 36-in. cast iron water main located in the
center of the business district. The Cleveland press reported that the cost to repair the first break, and
restore damage done by flooding, combined with the business losses associated with a complete shutdown
for two days, was about $1.5 million. After the second failure, the City decided to aggressively take
action to upgrade this line because the estimated cost of doing so was less than the costs associated with
these failures.
Main breaks of smaller mains for the most part have limited consequence and actually contribute to the
difficult task of condition assessment. Large transmission mains are another story, as major breaks can
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flood entire areas of a city with serious and costly consequences and some utilities are now experiencing
these types of breaks for the first time. For most mains, the repeated failure of a pipeline that
subsequently leads to repeated repairs are slow to become economically unfavorable in comparison to
rehabilitation or replacement. The driver for pipe renewal is often the customer's intolerance of repeated
or prolonged downtime.
As stated earlier, SRFs are insufficient to cover the costs for rehabilitating an aging water system and rate
structures for pubic water utilities typically are not designed to provide the level of funds needed. Water
rates are politically sensitive and, without significant increases over the years, often do not cover the cost
of providing clean water to stakeholders. Public utilities will need to find a way to raise rates to match
the value of water to society so that money becomes available for renewing the aging infrastructure.
It may take a significant disaster in the U.S., such as occurred in Walkerton, Ontario, to push politicians
to take action on rate increases. An outbreak of E. coll due to operator error in Walkerton, Ontario, in
May of 2000 resulted in the death of seven people from drinking contaminated water and another two
thousand people suffered from the symptoms of the disease (Holme, 2003). The disaster resulted in a
surge of regulations and other enforcement measures, resulting in water rates tripling in many Canadian
municipalities. Utility operators have commented, however, that there is actually few documented water
quality events related to pipe failure.
The rehabilitation of potable water distribution systems is an emerging market in the U.S. and abroad. An
exception is in the UK, primarily due to privatization of the water utilities in 1989, which resulted in an
accelerated adoption of new rehabilitation methods. This is not to say that the needs for water
rehabilitation are small. The needs are presented in the report Dawn of the Replacement Era: Reinvesting
in Drinking Water Infrastructure (AWWA, 200 la):
"For the first time, in many of these utilities a significant amount of buried infrastructure—the
underground pipes that make safe water available at the turn of a tap—is at or very near the
end of its expected life span. The pipes laid down at different times in our history have
different life expectancies, and thousands of miles of pipes that were buried over 100 or more
years ago will need to be replaced in the next 30 years. Most utilities have not faced the need
to replace huge amounts of this infrastructure because it was too young. Today a new age has
arrived. We stand at the dawn of the replacement era. Extrapolating from our analysis of 20
utilities, we project that expenditures of the order of $250 billion over 30 years might be
required nationwide for the replacement of worn-out drinking water pipes and associated
structures (valves, fittings, etc). This figure does not include wastewater infrastructure or the
cost of new drinking water standards. Moreover, the requirement hits different utilities at
different times and many utilities will need to accelerate their investment. Some will see
rapidly escalating infrastructure expenditure needs in the next 10-20 years. Others will find
their investment decisions subject to a variety of factors that cause replacement to occur
sooner or at greater expense, such as urban redevelopment, modernization, coordination with
other city construction, increasing pipe size, and other factors. "
These massive financial needs were also reported by EPA, which estimated that $183.6 billion need to be
invested by 2023 in distribution and transmission infrastructure pipelines (EPA, 2005).
-------
3.0: CHARACTERISTICS OF WATER MAINS
Estimates of the length of water distribution piping in the U.S. ranges from 980,000 miles by AWWA
(2004a), to more than one million miles by Grigg (2004), to nearly 1.8 million miles by Lafrance (2011).
Various materials are used in distribution systems and each material can be categorized differently based
on use and applicability. Each material can behave differently based on age, environmental conditions,
and water quality. This section discusses the characteristics of water distribution systems.
3.1
Pipe Materials
Current materials used in water distribution systems are steel, ductile iron (DI), polyvinyl chloride (PVC),
polyethylene (PE), prestressed concrete cylinder pipe (PCCP), and some glass reinforced plastic (GRP).
Materials no longer used for new installations, but present in the systems from the past include asbestos
cement (AC) and cast iron (CI). The following subsections identify the use and applicability of each
material from known sources including the Water Research Foundation (WaterRF) formally known as the
AWWA Research Foundation (AWWARF) and EPA reports.
3.1.1 Material Usage. Water mains can be categorized as distribution piping (2 to 10 in.) or
transmission mains (12 in. and greater) (EPA, 2009). Approximately 73% of all water mains, on a length
basis, are distribution pipes. Typically, pipe diameters less than 30 in. are considered non-man entry size
so any inspection or trenchless rehabilitation needs to be done remotely. This covers 93% of the entire
population of water mains. Tables 3-1,3-2, and 3-3 provide some statistics on the distribution of pipe
materials, pipe diameter, and age in the U.S. water distribution network (AWWA, 2004a).
Table 3-1. Water Distribution Systems by Material
Material
CI (unlined, cement mortar lined, and other)
DI (unlined, cement mortar lined, and other)
AC
PVC
Steel
PCCP
PE
GRP
Other/Not known
Total
Miles Installed
341,715
189,115
136,196
114,152
34,047
23,584
3,349
665
20,169
863,000
% of Total
39.6
21.9
15.8
13.2
3.9
2.7
0.4
0.1
2.3
100
Table 3-2. Water Distribution Systems by Diameter
Diameter Range (in.)
<6
6-10
12- 16
18-24
30-48
>48
Total
Miles Installed
107,200
523,200
138,600
29,700
57,700
6,600
863,000
% of Total
12.4
60.6
16.1
3.4
6.7
0.8
100
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Table 3-3. Water Distribution Systems by Age
Age (years)
0-10
10-25
25-50
>50
Total
Miles Installed
245,000
325,500
156,500
137,000
863,000
% of Total
28.4
37.6
18.1
15.9
100
For rehabilitation of water pipes, it is important to select a pipe material that is suitable for the operating
environment. Certain technologies require a specific pipe material and most replacement technologies
have preferred materials for the replacement pipe. Environmental factors, such as soil corrosivity, soil
composition, ground temperature, and groundwater actions, are important in choosing the right pipe
material for installation.
Selection of pipe materials for water supply applications is dependent upon pressure, durability,
installation, and water quality approvals such as National Sanitation Foundation (NSF)/American
National Standards Institute (ANSI) Standard 61 certification. Compatibility with existing materials in
the system is also a consideration. The selection process is both quantitative and qualitative and, as a
result of different experiences and preferences of utility managers, can result in a broad range of materials
being found within a single water distribution system.
3.1.2 Applicability. Until the 1940s, water mains were mainly unlined CI and steel. CI
manufacturers turned to DI pipe and CI ceased being manufactured altogether in the mid 1980s. Today,
more than 40% of all underground water mains are CI pipe. Although no longer used to replace old water
mains, there are more miles of CI pipe in use today than of any other material. Today, more than 475
U.S. utilities have had CI mains in continuous service for more than 100 years and they still function well
in daily use (AWWA, 2003a). Each of the pipe materials discussed in the sub-sections below have a
history of changes, application, improvements that might be important considerations in deciding which
technology to use and references that provide more detail are listed for each material as appropriate.
3.1.2.1 Cast Iron Pipe. The primary problems with unlined CI pipe are internal and external
corrosion. Internal corrosion (tuberculation) can lead to water quality issues, reduced flow and pressures,
and eventually leakage. CI pipe is also susceptible to external corrosion if not protected. Graphitization
of CI pipe weakens the pipe wall with the removal of iron ions leaving graphite behind. Graphitization is
not easily detected as the appearance of the pipe remains unchanged. The weakened pipe wall can then
fail with any increase in pressure (i.e., surge), frost heave, or ground movement. Also, the wall thickness
of new CI pipe was reduced over the years as the production process changed from pit cast to spun cast.
Consequently, younger CI pipe can actually pose a greater failure threat because it has thinner walls. CI
pipes are also susceptible to service connection corporation stop failures due to galvanic action, which
leads to leakage and to bending loads induced by loss of beam support (e.g., as a result of an adjacent
excavation), which results in circumferential cracks. CI pipe is strong but brittle, usually offers a long
service life, and is reasonably maintenance-free. However, CI is no longer used for manufacturing pipe in
the U.S. because of the greater strength of DI pipe, although it is still used in the manufacturing of some
valves and fittings. More information on cast iron water distribution pipes can found in Rajani et al.
(2000), Maker et al. (2005), and Rajani and Kleiner (2011).
3.1.2.2 Ductile Iron Pipe. DI pipe was introduced to the utility market in 1955 and has completely
displaced CI pipe. The DI pipe industry is represented by the Ductile Iron Pipe Research Association
(DIPRA). Initially, DI was unlined, like CI, but by 1975 most DI marketed for water service was cement
mortar lined. Internal corrosion is prevented by cement mortar lining and water treatment (e.g., pH
-------
adjustment, calcium carbonate addition, or metallic phosphate addition), while external corrosion is
prevented by wrapping the pipe in a PE film, bonded coatings, or cathodic protection (Deb et al., 2002).
Loose PE sleeves were later made available to electrically isolate the pipe from the soil with varying
effectiveness (Szeliga, 2007).
The U.S. DI pipe industry currently does not offer DI with bonded coatings. A bonded coating to the
exterior surface, in conjunction with cathodic protection to handle any inadvertent holidays in the coating,
is generally considered to offer the highest level of corrosion protection (Peabody, 2001). DI pipe is most
frequently used with the open trench installation method, but with restrained joint systems it can be
installed using pipe bursting and sliplining methods. More information on ductile iron water distribution
pipes can found in Rajani and Kleiner (2003), Liu et al. (2008), WaterRF (201 Ib).
3.1.2.3 Asbestos Cement Pipe. AC pipe was first introduced in North America in 1929 and it was a
popular for potable water mains from 1940s to the 1970s (Hu and Hubble, 2007). Production ceased in
the U.S. in 1983 and it still makes up 16% of U.S. water mains. AC pipe is made of asbestos fibers, silica
sand, and Portland cement. Being non-metallic, AC pipe was not subject to galvanic corrosion.
However, soft water removes calcium hydroxide (free lime) from the cement and this eventually leads to
deterioration of the pipe interior (softening accompanied by release of asbestos fibers) (EPA, 2009).
External exposure to acidic groundwater (e.g., mine waste) or sulfates in the soil can also lead to
deterioration of the cement matrix. The use of Type II Portland cement reduced the negative impact of
sulfates, but this was not always used. The production of AC pipe ceased in the U.S. in 1983, but despite
this cessation, a high percentage of all water mains today are asbestos cement (AWWA, 2004a). This
percentage is much higher on the West coast (closer to 20%) where AC pipe was used more widely.
More information on asbestos cement water distribution pipes can found in Hu and Hubble (2007), Hu et
al. (2009), and WaterRF (201 Ic).
3.1.2.4 Thermoplastic Pipe. Thermoplastic pipes initially in the form of PVC and more recently PE
have also found use as underground water mains. PVC pipes have been used significantly in U.S. water
distributions systems since the late 1970s (Burn et al., 2005). In Europe, PE is the dominant plastic pipe
material in water systems, but the reverse is the case in the U.S., although PE pipes are being increasingly
used in the U.S. A 2005 WaterRF study suggests that the flexibility of PVC pipe is a function of the
amount of plasticizers and lubricants mixed with the PVC resin in the manufacturing process (Burn et al.,
2005). PVC has a coefficient of thermal expansion five times that of DI or steel and PE has a coefficient
of thermal expansion nearly 20 times that of DI or steel and allowance for this expansion and contraction
must be made in the design (AJ Design, 2011). Thermoplastics are not subject to internal or external
corrosion and have a high resistance to chemical and biological degradation. They are, however, subject
to permeation and degradation by petroleum hydrocarbons (PHC) and may not be suitable for installation
in PHC-contaminated soil. Thermoplastic pipes are not subject to electrochemical or galvanic corrosion.
The strength of PVC is related to the operating temperature and as the operating temperature decreases,
the pipe's stiffness and tensile strength increase, which increases the pipe's pressure capacity and makes it
better able to resist deflections due to soil loading. On the other hand, as temperature decreases, PVC
pipe also becomes less ductile and loses impact strength, requiring greater care in handling and placement
in the trench. Care should be taken to avoid excessive deflection of PVC pipe (AWWA, 2002). PVC
pipes have experienced premature fatigue-related failures when used in cyclic pressure applications (e.g.,
irrigation systems and force mains). A recent WaterRF study provides evidence that the longevity of a
PVC pipe is directly related to its resistance to slow crack growth, which is dependent on the pipe's
fracture toughness and distribution and size of defects in the extruded pipe wall (Burn et al., 2005). Most
PVC pipe failures tend to be brittle, not ductile, which tends to support the conclusions of the WaterRF
study.
10
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Since PE pipe is light weight and available in various lengths, it is relatively easy to handle and install.
PE is the material most frequently used in water supply applications in the UK. It is estimated that PE
represents 4 to 6% of the potable water market in the U.S. and nearly 100% of the gas distribution market
(Anon, 1999). More information on thermoplastic water distribution pipes can found in Moser and
Kellogg (1994), Burn et al. (2005), and Davis et al. (2007).
3.1.2.5 Steel Pipe. Steel pipe is very strong and rigid, but it is subject to internal and external
corrosion. Internal corrosion can be prevented by various measures. Common measures being used by
utilities include cement mortar lining and water treatment such as pH adjustment, calcium carbonate
addition, or metallic phosphate addition, while external corrosion is minimized by wrapping the pipe in a
PE film, bonded coatings, or with cathodic protection systems. Steel pipe sections can be either welded
together or connected using mechanical gasketed joints. Fittings and adapters are easily available in the
market to connect steel pipe to PE and PVC pipe and to DI pipe and valves. Steel pipe is usually used for
large diameter or high pressure applications. Steel pipe (usually lined) can also be used as a replacement
pipe in pipe bursting applications and steel pipe is compatible with pipe jacking techniques. AWWA
Manual Mil (AWWA, 2004b) is a guideline for steel pipe design and installation, and more information
on steel water distribution pipes can found in WaterRF (201 Id).
3.1.2.6 Prestressed Cylinder Concrete Pipe. PCCP was first manufactured in the 1940s and consists
of a concrete core, thin steel cylinder, high tensile pre-stressing wires, and a mortar coating. PCCP is
typically used for large diameter mains, making failure of this pipe type relatively catastrophic and costly.
PCCP can be one of two types, either embedded cylinder pipe (ECP) or lined cylinder pipe (LCP). PCCP
with diameters greater than 48 in. are ECP and PCCP with diameters up to and including 48 in. are LCP.
AWWA C304-07 describes the various design specifications, requirements, etc. for PCCP (AWWA,
2007a). Figure 3-1 illustrates a brief classification of PCCP. The various components of the PCCP are
the mortar coating, prestressed wire, steel cylinder, and concrete core ECP. More information on PCCP
water distribution pipes can found in Romer et al. (2008) and Zarghamee et al. (2011).
Diameter?
LCP
ECP
1
Grade 1
Wire
i
r
Grade II
Wire
1
Grade III
Wire
i
Grade IV
Wire
Figure 3-1. Classification of PCCP Pipes
3.1.2.7 Glass Reinforced Plastic Pipe. GRP is known by several names including glass reinforced
plastic, glass reinforced polyester, and fiberglass reinforced plastic (FRP). GRP is manufactured to meet
a wide variety of service requirements. It is commonly used in sewer gravity pipe applications in Europe
and GRP pressure pipe has been approved and available for use in potable water applications in the U.S.
11
-------
for a few years. Some GRP is manufactured as a composite of wound glass fibers, resin, filler, and sand
applied in a centrifugal process, while other uses a winding type process.
GRP is joined with gasketed pressure joints and is normally supplied with ethylene propylene-diene
modified (EPDM) gaskets, which are not resistant to hydrocarbons (Le Gouellec and Cornwell, 2007).
GRP can be manufactured with various resins including polyester, vinyl ester, and epoxy. GRP does not
corrode and has an expected useful life in excess of 100 years. GRP has been used in sliplining and pipe
jacking applications. Its rigidity does not allow it to be passed through bends greater than 3° and it cannot
be tapped. In sliplining applications, GRP is limited to straight runs with few service connections and its
size makes it more compatible with transmission mains rather than distribution mains. Without a
restrained joint, it must be pushed rather than pulled through the host pipe. For potable water pressure
pipe applications, an epoxy coating is applied to the inside surface of the pipe.
3.2 Pipe Failure Modes
There is a vast array of pipe types, with and without corrosion protection systems, in the more than one
million miles of aging water mains. The failure mechanism of each type of pipe is different - meaning
that rehabilitation solutions must be tailored to match the problems experienced by a specific type of pipe
material, or be flexible enough to cover a multitude of performance problems that may vary depending on
operating and environmental conditions.
CI, DI, and steel piping may be subject to internal and external corrosion, resulting in pitting and wall
thinning, which can lead to leakage and eventual burst failures. Cement-based pipes such as AC,
reinforced concrete pipe (RCP), and PCCP are also subject to deterioration due to corrosion of the cement
matrix, and the underlying steel reinforcement in the case of reinforced concrete pressure pipes. In
addition, all types of pipe including thermoplastics are subject to joint failure between pipe lengths and
hence excessive leakage, which can in turn lead to washout of bedding and loss of structural support. If
the pipe is not structurally sound, it becomes a candidate for repair, rehabilitation, or replacement
(AWWA, 200Ib).
For all pipe types, leaks, breaks, pressure complaints, and discolored water are all indicators that pipelines
are in need of attention. An understanding of the failure modes and their indicators is useful in assessing
the condition of the pipe material and selecting the appropriate timing and type of renewal technique to
use. These failure mechanisms and failure indicators have been discussed in the literature such as
AWWA (2001b), Royer (2005), Reed et al. (2006), and Grigg (2007).
Any asset management program must start with a thorough review of available historical data about pipe
performance and failure indicators. A properly assembled database with utility asset information can help
to more precisely analyze and define the priority of pipe renewal work required. Figure 3-2 summarizes
the type of information that is useful to collect regarding pipe assets for an asset management program.
Analysis of this information in a database, relative to specific pipe segments, material types, sizes,
manufacturer date, performance criteria, or other defining characteristics will likely generate patterns
indicating those assets most in need of renewal.
Once the necessary data is gathered, deterioration models or engineering analysis can be used to provide
insight into the condition of pipeline assets and to target specific pipelines for renewal. A cost-effective
inspection program that complements the historic data can then be used to fill in gaps that remain in order
to facilitate the design, selection, and implementation of renewal options. More information on
inspection technologies, deterioration modelling, and asset management tools for the prioritization of
water main renewal can be found in Condition Assessment Technologies for Water Transmission and
Distribution Systems (EPA, 2011 a).
12
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Manufacturing
Pipe
Properties
Internal Loads
Age of Pipe
Installation
Operating
Condition
External
Loading
Conditions
Bedding
Conditions
Differential
Settlement
Internal water
pressure
Temperature
Impact
Chemicals
Crack/
Fracture
Hole
Broken
Exfiltration
Deformed
Collapsed
Corrosion
Lead-Time of the Indicators
Pipe
Failure
w
Installation
Operations and Maintenance
Repair and Rehabilitation
Figure 3-2. Factors Contributing to Pipe Failures
13
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4.0: RENEWAL TECHNOLOGIES
System rehabilitation is the application of infrastructure repair, renewal, and replacement technologies in
an effort to return functionality to a drinking water distribution system or a wastewater collection system
(EPA, 2007a). Generally, rehabilitation includes a broad spectrum of approaches, from repair to
replacement, that attempt to return the system to near-original condition and performance. Various
AWWA reports define repair, rehabilitation, and replacement in the following way:
• Repair. Techniques used when the existing pipe can be readily restored to a structurally sound
condition, providing the pipe has acceptable flow capacity and supports good water quality
• Rehabilitation. Techniques that are often used to extend the operational life and restore much or
all of the pipe's hydraulic capacity, improve water quality, and/or restore structural functionality.
• Replacement. When the existing pipe is severely deteriorated, collapsed, or increased flow
capacity is needed, it is usually replaced.
The concepts of repair, rehabilitation, and replacement can be collectively termed as renewal. The pipe
systems can be addressed by rehabilitation, repair, and replacement methods such as open cut
(conventional) or trenchless technologies. Pipe relining is considered as a structural and/or water quality
measure, while pipe replacement (with the same or a larger diameter pipe) improves both the structural
integrity and hydraulic capacity of the line (Kleiner et al., 2001).
Because most rehabilitation methods are relatively new to the U.S. water market, the advantages and
disadvantages and capabilities and limitations of each system are seldom clearly understood. A pipeline
renewal program should therefore start with a review and analysis of the various pipeline rehabilitation
techniques that are available. As part of this analysis, the utility should investigate the service line
reconnection requirements for each type of rehabilitation technology. These requirements vary
considerably, as do the impacts on customer service, project risk, and final cost.
Significant reductions in the cost of water main rehabilitation are being achieved now that new methods
are emerging to reconnect services without excavating large access pits for each service connection. With
this problem addressed, pipeline rehabilitation could become the most common method of renewing water
mains, just as it is now for wastewater mains. Ultimately, utilities could complete many more miles of
pipeline renewal each year, with the side benefits of causing fewer inconveniences to their customers.
Service lines can certainly be connected without digging access pits. Many promising concepts for
service reconnection have already been developed and several have been implemented in practice.
Renewal technologies can be divided into repair, rehabilitation, and replacement technologies as shown in
Figure 4-1. One of the simplest forms of renewal is a spot repair, usually implemented on a reactive basis
to a failure. More extensive renewal technologies are rehabilitation (using the existing structure of the
water main) and replacement (installing a new independent pipe). This new pipe can be installed offline
using a different alignment or online using the same line and grade of the existing pipe. Both offline and
online replacement can involve trenchless technologies. These technologies have been further divided
into different sub-sections based on technical parameters as seen in the data sheets and described in
industry standards.
14
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Rehabilitation
Use existing
pipe structure
Replacement
No use of existing
pipe structure
hiepair
Use existing pipe
structure
Figure 4-1. Renewal Approaches for Water Mains
A technology-specific datasheet was created for the majority of the technologies reviewed in this SOT
report and these datasheets are included in Appendix A. Table 4-1 summarizes the datasheets along with
the diameter range and upper pressure limit(s) for each of the renewal methods. Vendor contact
information can be located on each datasheet along with the technology history, description, and
applicability; material composition and technical envelope; relevant product, design, and installation
standards; O&M requirements; relevant case study information as available; and references.
Table 4-1. Summary of Renewal Technologies for Water Distribution Systems
Technology
Spot Repair
Joint Repair
Spray -On
Lining
Category
Wrap
Sleeve
Spray-On
Epoxy
Spray-On
Polyurethane
Seals
Chemical Grout
Cement Lining
Epoxy Lining
Polyurea Lining
Polyurethane
Lining
Brand Name
QuakeWrap™
Tyfo® FibrWrap®
CarbonWrap™
A+ Wrap™
Frey-CWRAP®
Duraloop®
Hydro-Seal™
Belzona®5811DW
Powercrete® PW
SprayWall®
SprayShield Green® I
Weko-Seal®
HydraTite
Amex-10®
Clock Spring®
AV-202/AV-303
Cement Lining
WaterLine
AquataPoxy®
SubterraELC 257-91
Scotchkote™ 169
Polymeric Resin
Subterra Fast-Line
Plus™
Vendor
QuakeWrap, Inc.
Fyfe Company
CarbonWrap™
Pipe Wrap LLC
Freyssinet LLC
Freyssinet LLC
Link-Pipe
Belzona, Inc.
Protection Engr.
Sprayroq
Sprayroq
Miller Pipeline
HydraTech
Amex GmbH
Clock Spring Co.
Avanti Intl.
Mainlining, et al.
HydraTech
RLS Solutions
Daniel Contr.
3M
Acuro Inc.
Daniel
Contractors
Diameter
(in.)
>36
>24
>36
>0.5
60-120
60-120
4-54
>36
>8
>36
>36
16-216
18-218
10-230
4-56
>30
>4
>4
3-36
4-24
4-48
>2
3-60
Pressure
(psi)
500+
350
N/A
N/A
290
290
150
N/A
N/A
450
N/A
300
300
290
N/A
N/A
N/A
70-650
N/A
N/A
N/A
200
N/A
Pg.
#
A-51
A-77
A-13
A-47
A-19
A-19
A-35
A-ll
A-49
A-61
A-59
A-39
A-23
A-7
A-17
A-9
A-15
A-25
A-55
A-65
A-3
A-5
A-67
15
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Table 4-1. Summary of Renewal Technologies for Water Distribution Systems (Cont.)
Technology
Sliplining
CIPP
Inserted
Hose Lining
Close-Fit
Lining
Service Line
Category
Segmental
Continuous
Semi-Structural
and Structural
Woven Liners
Fold and Form
Symmetrical
Reduction/
Reduced
Diameter Pipe
Expandable
PVC
Grout-in-Place
Melt-in-Place
Close-Fit
Lining
Epoxy Coating
Brand Name
HOPE, DI, et al.
Fusible C-900®
Fusible C-905®
FPVC®
Insituform PPL®
Aqua-Pipe®
InsituMain®
Tubetex™
NordiPipe™
Starline® 1000 / HPL-
W
Primus Line®
Subterra Subcoil
Thermopipe®
InsituGuard® " Folding
Subterra Subline
Subterra Rolldown
Tite Liner®
InsituGuard® -
Flexing
Swagelining™
Duraliner™
MainSaver™
Aqualiner
Neofit Process
Nu Flow Epoxy
Vendor
HOBAS et al.
Underground
Solutions
Insituform
Sanexen
Insituform
Sekisui
NordiTube
Sekisui
NordiTube
Starline
Trenchless
Radlinger
Daniel Contr.
Insituform
Insituform
Daniel Contr.
Daniel Contr.
United Pipeline
Insituform
Swagelining Ltd.
Underground
Solutions
MainSaver™
Aqualiner
Wavin/Flow-
Liner®
Nu Flow
Technology
Diameter
(in.)
18-110
4-12
14-36
4-36
8-60
6-12
6-60
4-40
6-48
4-24
6-15
3-10
2.75-12
12-48
3-60
4-20
2-52
6-10
4-60
4-16
4-12
6-12
.5-1.5
.5-10
Pressure
(psi)
50-250
165-305
80-235
N/A
200
150
150
460
60-250
150-250
1000
90
170-230
150
90
230
N/A
150
N/A
150
294
150
87-116
N/A
Pg.
#
A-21
A-81
A-81
A-81
A-31
A-57
A-29
A-43
A-41
A-63
A-53
A-71
A-33
A-27
A-73
A-69
A-83
A-27
A-75
A-79
A-37
A-87
A-85
A-45
Renewal approaches vary for small diameter pipes (i.e., pipes less than 16 in. in diameter) and large
diameter pipes (i.e., pipe 16 in. in diameter and larger). Small diameter mains are typically easier to
replace than large diameter mains, except in areas where access is limited or impossible. Small diameter
mains are typically less consequential when they fail and can be monitored based on their break and leak
history to determine when to renew. When replacement of small diameter mains in not possible due to
access limitations or disruption concerns, many of the technologies in Table 4-1 are appropriate for
renewing them. Large diameter mains are typically more consequential when they break and therefore
require a more proactive strategy to determine the condition of the main and an appropriate renewal
strategy. The technologies available for small and large diameter renewal are signified by their diameter
range in Table 4-1 and are discussed in the following sub-sections.
4.1
Repair
Repair technologies are used for small segments of the pipe and specifically for localized problems or
poor workmanship. They can be short or long term in nature.
16
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4.1.1 Open Cut Repair. Water utilities undertake open cut repairs on an as-needed basis or put
out larger works for tender. Regular repairs on large diameter mains due to inappropriate pressure
readings, hydrant checks, or as a result of monitoring policies is common practice. Many utilities retain
direct labor crews of skilled workers to install and repair corporation stops, maintain and replace water
meters, and service existing infrastructure. Such crews have their own tool set and materials such as
epoxy and cement mortars, pipe wraps, and rubber gaskets that are approved by NSF/ANSI Standard 61
certified or by the State regulatory body.
More adverse situations require open cut repairs as well. This is particularly true with pressure pipes such
as water mains that handle high pressures. With numerous valves, hydrants, and bends in the system,
small- and medium-sized utilities follow a simple process. They put into service a redundant line and
shut down supply to the distressed line in the network. The area is then excavated either for local repairs
or more substantial structural provisions on the external surface of the pipe. These measures are the result
of emergency response to pipe failures or customer complaints. Complaints may range from
discoloration, turbidity or odor in water, reduced pressure, or no water at all. The response time to such
measures is different from utility to utility, but aims at same day return to service in all but major breaks.
Installation methods on open cut construction job sites require traffic planning, following of standard
Occupational Safety and Health Administration (OSHA) guidelines, and adequate training and skills for
repair crews. Larger utilities may follow more elaborate procedures, routine maintenance, preventive
maintenance, or reliability-centered maintenance procedures (Basson et al., 2006). These procedures may
require valve, junction entry, or an open cut repair of pipe or joint sections. Large utilities thus require
scheduling specialized crews and equipment.
4.1.2 Spot or Localized Repairs. Water utilities faced with problems of localized corrosion or
structural damage (particularly in pipes greater than 30 in.) increasingly make use of localized repair
techniques. These methods may be external involving local exposure of the buried pipe, including the
methods mentioned in the previous section; or internal involving temporary interruption of water supply
service, creation of access, and disinfection before returning the pipe to service. Spot repair methods for
pressure pipelines are often more complex than those applied in gravity pipe applications, requiring
careful consideration of pipe structural condition and required capability so that a robust design with
proper consideration of engineering material properties and long-term performance can be considered.
Water main shutdown for this work requires careful planning and implementation to minimize disruption
of service.
4.1.2.1 QuakeWrap™. Quake Wrap, Inc. offers a fiber reinforced epoxy system using a variety of
woven fabric and pre-impregnated plates of glass and carbon fiber reinforcement for hand and machine
applied wraps to strengthen deteriorated pipes and structures. Developed from work at the University of
Arizona, it has been used for repair of PCCP and cast-in-place reinforced concrete pipe (Ehsani and Pena,
2009) in spot locations and for large sections of pipe as shown in Figure 4-2.
The company offers QuakeWrap™ fabrics and plates and QuakeBond™ epoxy resins. The
QuakeWrap™ system using QuakeBond™ J201TC tack coat and QuakeBond™ J300SR saturating resin
with QuakeWrap™ VU18C carbon fabric is NSF/ANSI Standard 61 certified.
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Figure 4-2. Application of QuakeWrap™ (courtesy of Quake Wrap)
4.1.2.2 Tyfo FibrWrap Systems. Fyfe Company, which was recently purchased by Insituform,
has a Tyfo® SCH-41 composite system that is a patented carbon fiber reinforced polymer (CFRP) system
for strengthening deteriorated structures including PCCP, reinforced concrete pipe, and metallic pressure
pipe (Carr, 2007). This pipeline rehabilitation system has been used for approximately 13 years to add
structural strength and protect against corrosion. The FibrWrap® System, which has atypical design life
of 50 years, can provide a stand-alone design that does not rely on the integrity of the host pipe or it can
act in conjunction with the host pipe to provide a compositely designed structural system, depending on
the requirements of the project. The Tyfo® FibrWrap® System is made up of Tyfo® S epoxy and Tyfo®
SCH-41 reinforcing fabric as shown in Figure 4-3.
I
1
Figure 4-3. Wrapping Large Diameter Mains with Tyfo® FibrWrap® System (www.fyfeco.com)
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The carbon fabric is a custom weave, uni-directional system with glass cross fibers. American Society for
Testing and Materials (ASTM) standard D-3039/D-3039M is followed for determination of structural
properties such as tensile strength, strain, and tensile modulus (ASTM, 2008a). The composite system
including Tyfo® WP, TC and PWC epoxies as well as the Tyfo® 41 fabric is NSF/ANSI Standard 61
certified. Fyfe Company's Tyfo® SCH-41 fabric's suggested saturation level is 3 to 4 units of epoxy per
600 square foot roll. The standard shipping size of the Tyfo® SCH-41 roll is 24 in. by 300 linear
feet; however, the composite fabric can be pre-cut to desired lengths to meet the pipe diameter. Prior to
installation, the surface must be clean, dry, and free of cavities and protrusions. Sandblasting, grinding,
or other scarifying techniques are required to enhance the bonding capabilities between the composite
system and the existing substrate. The fabric is saturated with epoxy using a mechanical saturator, and is
applied to pipes using wrapping equipment or approved hand methods. Tyfo® FibrWrap® System
applications are performed by FibrWrap Construction to ensure proper QA/QC procedures are followed
to meet material property specifications.
4.1.2.3 CarbonWrap™. CarbonWrap™ is a pipe wrapping system developed by Dr. Saadatmanesh
at the University of Arizona. This system was developed in 1987 and has been available in the market
since 1994. CarbonWrap™ is a composite fabric containing glass, carbon, or aramid fibers. It may be
supplied as a fabric or in pre-cured strips. The flexible fabric or strip is saturated in the field and is
bonded to the pipe wall, using a specially formulated structural epoxy. It can be installed externally or
internally, as shown in Figure 4-4. In the case of man entry diameter pipes, access is made through
prepared access points and all operations are conducted internally. If the pipe can be accessed from the
outside, the wrapping can be installed on the outside face of the pipe resulting in the same benefits.
Figure 4-4. Options of CarbonWrap™ (www.carbonwrapsolutions.com)
CarbonWrap™ fabrics are available in the range of 24 to 50 in. wide and up to 150 yard length in rolls.
The fabric thickness ranges from 0.014 to 0.04 in. and several layers can be applied to build up to the
design thickness, typically 0.125 in. Material property tests are detailed in ASTM D-3039/D-3039M
(2008a) and ASTM D-638 (2008b) and design parameters are detailed in American Concrete Institute
(ACI) 440-R (ACI, 2007).
4.1.2.4 A+ Wrap™. Pipe Wrap's A+ Wrap™ (PWAP) is used to rehabilitate U.S. Department of
Transportation (DOT) regulated pipelines. PWAP works as a corrosion barrier and structural
reinforcement against external defects (Figure 4-5). PWAP is allowed for DOT pipeline repairs under 49
Code of Federal Regulations (CFR), parts 192 and 195 (CFR, 2011), and it has been validated and
certified for use under the American Society of Mechanical Engineers (ASME) PCC-2 article for B31.3,
B31.4, and B31.8 (ASME, 2011); and the International Organization for Standardization (ISO) standard
24817 (ISO, 2006).
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Figure 4-5. Application of A+ Wrap (courtesy of Pipe Wrap LLC)
PWAP uses an epoxy undercoating that is wrapped with a water activated moisture cured urethane resin
impregnated woven fiberglass material. This must be sprayed with water before each layer of
undercoating and wrap is applied. It has a setting time of 1 hour and a 100% curing time of 24 hours.
4.1.2.5 Frey-CWrap®. Freyssinet LLC is a well established company specializing in bridges and
other prestressed and post-tensioned structures. Frey-CWrap® is their CFRP solution for rehabilitation of
pipes, which can be used to address full lengths of pipes or spot repairs. It is an internally applied
composite made up of a carbon fiber fabric saturated with epoxy resins, which is then bonded to the pipe
wall, as shown in Figure 4-6. The Frey-CWRAP® resin and fabric is NSF/ANSI Standard 61 certified for
use in potable water mains. It can be applied manually by a specially designed robot called the Foreva®
Frey-CWrap® Robot in 60 to 120 in. diameter pipes.
Figure 4-6. Frey-CWRAP Material and Robotic Repair (courtesy of Freyssinet)
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The main advantage of the robot is the increased speed of application. The robot is a self motorized
module carrying a rotating arm which helically wraps CFRP on the inner surface of a pipe. It can apply
the fabric at a speed of up to 16 ft per minute. The material is manually applied at certain spot locations
such as elbows, slope changes, and valves. Freyssinet also offers an externally applied pre-grouted PE
sheathed post tensioning system called Duraloop®.
4.1.2.6 Hydro-Seal™. The Link-Pipe Hydro-Seal™ is an internal repair method, designed to seal
joints and isolate lead in the joints from leaching into the potable water in old CI mains. Placing the
sleeve on the internal face of the pipe can be done using closed circuit television (CCTV) and winching
equipment. This is similar to the grouting sleeves used in gravity sewer rehabilitation. It seals leaks
using mechanically locked stainless steel sleeves and an NSF/ANSI Standard 61 certified resin sealant.
The sleeve core is made of stainless steel SST-316 with an internal locking mechanism. The external
fabric is saturated with resin that is mechanically pressed against the host pipe when the sleeve is
expanded and locked in place. The resin is ambient temperature cured, which seals the sleeve in place
and mechanically bonds to the host pipe, thus sealing the joints, pin holes, and cracks in the pipe. The
cross section is detailed in Figure 4-7.
Hydro-Seal™ ranges in diameters from 4 to 54 in. (100 to 1350 mm) having a wall thickness such that
the sleeve should not protrude more than 3/8 in. (10 mm) into the host pipe. It is tested up to 560 pounds
per square inch (psi) (37 bar) ultimate pressure over a 3/8-in. wide open joint and the maximum
recommended working pressure in the pipe is 150 psi. Hydro-Seal™ is available in the market in
standard lengths of 12 in. (300 mm), 18 in. (450 mm), 24 in.(600 mm), and 36 in. (900 mm).
Figure 4-7. Cross Section of Stainless Steel Pipe Sleeve (www.linkpipe.com)
4.1.2.7 Epoxy Coatings. Several epoxy lining materials are currently approved for use in potable
water systems under NSF/ANSI Standard 61 guidelines. Two-component epoxy resin products, 100%
solids by volume with no reactive solvents orthinners present may be suitable for making local repairs.
They may be hand applied, but are usually applied in the case of large applications with specially
designed machines. These machines have separate, heated reservoirs from which positive-displacement
pumps precisely control the proportions of resin and hardener applied to the pipes. Examples of spray or
brush applied epoxy for local repair are Belzona® 5811DW and Powercrete® PW.
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Belzona® 5811DW (Immersion Grade) is a two-component system for protection of metallic and non-
metallic surfaces, such as concrete as shown in Figure 4-8, operating under immersion conditions in
contact with aqueous solutions and aggressive chemicals.
Figure 4-8. Belzona 5811DW on a Concrete Surface (courtesy of Belzona, Inc.)
5811DW can be applied to pipe diameters greater than 36 in. internally and has a final cure time of
roughly 7 days at 68°F or 4 days at 86°F according to NSF. It can repair and protect weld seams and seal
pipe expansion bellows, linings, and leaking pipes. It can also be used in chemically aggressive
environments and can resist attacks of a wide variety of hydrocarbons.
Powercrete® PW is a liquid epoxy resin providing corrosion resistance and abrasion resistance in steel and
DI pipes. It can be spray or hand applied, internally or externally in pipes 8 in. in diameter and larger.
The final cure time is up to 10 days at 104°F.
4.1.2.8 Polyurethane Coatings. In addition to other vendors, Sprayroq provides a polyurethane
based liner called SprayWall®, which is shown in Figure 4-9. SprayWall® is a golden colored, spray-
applied, 100% volatile organic compounds (VOC)-free polyurethane coating that provides both structural
reconstruction and chemical resistance against elements that eat away at underground structures.
Figure 4-9. Polyurethane Lining by SprayWall (www.sprayroq.net)
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Once the two components are mixed, Spray Wall® begins to gel in about 8 to 12 seconds, with a tack-free
condition after one minute. Within 30 to 60 minutes, the initial cure is completed and the structure is
capable of accepting flow, while the complete curing continues for the next 4 to 6 hours. It has a 50-year
design life retaining 70% of its flexural modulus and adheres for thickness design to ASTM F-1216
Appendix XI (ASTM, 2009a).
Spray Shield Green® I is a similar light green colored polyurethane product with lower petrochemical
derivatives, non-structural physical properties, and 35% biobased content for enhanced environmental
performance. SprayWall® and Spray Shield Green® I are NSF/ANSI Standard 61 certified and may be
used for protection of valve chambers and other water pipeline appurtenances.
4.1.2.9 Joint Repairs. Corrosion is one of the main reasons for leakage from joints in metallic pipes.
Replacement of the bolts holding the sealant and ring system is the simplest procedure to renew the joint.
Structural failures require a more complex approach such as a cut-out or spool pieces. A small piece of
pipe may replace the distressed area with mechanical couplings at both ends. With certain PE pipes it is
also possible to use electrofusion couplers that have a copper heating coil embedded in them. A current is
passed through the system to melt the PE and fusion takes place between the pipe and the coupler.
Instead of using repair clamps, some method variations require grout packing and a wrap-around material.
Mechanical systems for internal joint sealing generally involve the mechanical compression of a
polymeric seal both for man-entry and non man-entry pipes. EPDM is a preferred seal material for use
with potable water mains. Weko-Seal® (Hayre, 1986), HydraTite (Figure 4-10), and Amex®-10 seals are
examples of profiled seal gaskets clamped in place across a leaking joint or at the termination of a lining
system. Stainless steel retaining bands are hydraulically expanded into place to seal the EPDM against
the pipe wall and locked in place to make the seal leak tight.
Figure 4-10. Application of a HydraTite Retaining Bands (courtesy of HydraTech)
Techniques from the oil and gas industry for joint repair include external encapsulation where the
polymer resin is applied on a leaking joint through a mould or by hand with the main still in service. To
bond joints in irregularly shaped pipes, Clock Spring® or HydraWrap® products are available. Clock
Spring® is comprised of a coil shaped composite sleeve wrapped around the distressed segment which is
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then bonded to the pipe with an adhesive and a high strength filler material mix. The HydraWrap®
system provides a corrosion barrier for degrading pipe and is certified to NSF/ANSI Standard 61.
Joint repair systems that inject grouts through leaking joints are commonly used in the wastewater
industry. Typically, an inflatable packer is winched in position and centered on a defective joint, the
packer is inflated so that the outer sections of the packer seal are against the pipe, and chemical grout is
pumped through the leaking joint to surround the joint and prevent ingress of groundwater. Certain
grouting chemicals are NSF/ANSI Standard 61 certified for contact with potable water and may be
suitable for sealing leaky joints in low pressure water mains. Hydrophilic and hydrophobic polyurethane
grouts such as Avanti AV-202, AV-330, and AV-333 (which is equivalent to the former 3M Scotch-Seal
5600) may be suitable. These grouts are generally pumped from inside the pipe into joints or cracks.
4.2 Rehabilitation
Rehabilitation focuses on the renewal aspects of water mains where the existing pipe becomes part of the
renewal work. If the rehabilitation is to provide only corrosion protection, or the existing pipe is only
partially deteriorated, then the remaining structural strength of the existing pipe can be incorporated into
the fabric of the completed system. For fully deteriorated situations, the existing pipe acts merely as a
right-of-way for the installation of the structural liner. Sliplining, which is sometimes considered a
replacement method, is also included in the discussion in this section. Pipe bursting can also be
considered a rehabilitation method, but is covered in this report as a replacement method. The
rehabilitation methods for water mains are shown in Figure 4-11 and include the use of spray-on lining,
sliplining, CIPP, inserted hose lining, and close-fit lining systems.
Rehabilitation
Cleaning
Close-Fit
Lining
Figure 4-11. Rehabilitation Approaches for Water Mains
The summary from a 2007 WaterRF report shown in Table 4-2 remains an excellent summation of
generic methods and their advantages and disadvantages (Ellison et al., 2007). Another paper discussing
various rehabilitation technologies is Bontus et al. (2007). The choice of method will be largely dictated
by the perceived condition of the pipe, project objectives, and estimated costs. Determining which
method is the most economical for any given situation is difficult since it depends upon the perceptions of
the contractors who bid the work and, if a method is highly specialized or proprietary, the number of
bidders will be limited. It is a good idea to permit alternative methods to bid, letting the marketplace
decide which is the most economical for a particular situation. Where the alternatives do not provide
equally desirable products, the bid documents need to clearly indicate how the alternative bids will be
compared.
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Table 4-2. Various Rehabilitation Techniques
Method
Cement Mortar
Lining (CML)
Spray -On Epoxy
Lining
Other Spray -On
Plastic Linings
Polyester
Reinforced PE
Cured-in-place
pipe Lining
Reinforced CIPP
Straight (Loose-
Fit) Sliplining
Tight-fit high
density PE
(HOPE)
Sliplining
Tight-fit PVC
Sliplining
Tight-fit Steel
Sliplining
Advantages
Time tested
25 to 50% of replacement cost
Several contractors available
Works with soft water
Cost competitive with CML on small
diameter piping
Faster placement of line back into
service than CML
Short cure times may mean shorter
service outages.
Bypass system may not be needed, if
done sanitarily.
Provides full-pressure restraint
Provides some structural improvement
Several contractors available
Can handle pipe bends
Can provide full structural rehab
Can handle pipe bends
Provides full structural renewal
No special equipment or expertise
needed
Various materials can be used
Can be very cost-effective
Generally provides partial structural
improvement
Can be cost effective
Full pressure rating
Can be cost effective
Cost effective for large-diameter
pressure pipes
Disadvantages
Non-structural
pH problems where water is very soft
Requires bypass system
Uncertain pipe life extension
Non-structural
Small defects lead to combined corrosion
Few U.S. customers
Cost for large pipes higher than CML
Requires Bypass system
Uncertain pipe life extension
Uncertain long-term performance
Limited experience
Uncertain pipe life extension
Proprietary
Special fittings required
Uncertain long-term performance
More costly than CML or epoxy lining
Requires bypass system
Uncertain pipe life extension
NSF/ANSI 61 approval depends on
materials used (usually epoxies)
Proprietary
Requires bypass system
Uncertain pipe life extension
Reduced hydraulic capacity
Requires bypass system
Requires area to lay out pipe string
Excavation to reinstate service
connections needed
Required special equipment/ license
Requires bypass system
Requires area to lay out pipe string
End connections challenging
Proprietary
Uncertain long-term performance
Requires bypass system
Requires area to lay out pipe string
Reduced hydraulic capacity
Welding problems have led to failures
4.2.1 Spray-On Linings. Spray-on linings have been one of the most widely used methods for
rehabilitating a pressurized main when the primary objective was to provide corrosion protection to the
interior surface. Spray-on linings are either cementitious or polymer-based as shown in Figure 4-12. In
this report, the term spray-on includes conventional spray applications and spin-cast, projectile, or
centrifugal applications. More information on spray-on linings can be found in Ellison et al. (2010).
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Non-Reinforced
Reinforced
Epoxy
Polyurea
Polyurethane
J
Figure 4-12. Summary of Spray-On Lining Technologies
4.2.1.1 Cement Mortar Lining. CML is one of the most common rehabilitation techniques in use
today for rehabilitating water mains. Principal contractors include Spiniello (Figure 4-13), Mainlining, J.
Fletcher Creamer, Dakota Pipelining, Heitkamp, and Walsh. CML is applied to a wide variety of pipe
diameters including 4 in. (100 mm) and above shop applied, and 4 in. (100 mm) to 28 ft (9.2 m) in place.
For pipes greater than 30 in. (750 mm) in diameter, reinforcement can be added in the form of wire mesh
or reinforcing bar. Lining thickness is typically 6 mm for 4 to 10 in. (100 mm to 250 mm) pipe and 13
mm for 36 in. (900 mm) or larger pipe. The lining is placed by either the centrifugal or projectile method.
In the centrifugal process, typically for pipes 4 to 48 in., the mortar is applied by compressed air through a
spinning head and is generally smoothed by a conical trowel. In pipes 6 to 24 in., a cable winch that is
controlled above the ground pulls the unit through the pipe as outlined in Figure 4-14. The cement mortar
is pumped to the unit through the supply hose.
Figure 4-13. Spiniello Projectile Rig for CML (www.spiniello.com)
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li mi mi mi nn irn =nn nn 1111
Figure 4-14. Dakota Pipelining Centrifugal Small Diameter Rig (www.dakotapipelining.com)
For pipes that are larger than 24 in. in diameter, an operator can ride the machine through the pipe,
controlling the centrifugal unit. For larger pipes, using the projectile method, a rapidly revolving arm
slings mortar onto the pipe wall shown in Figure 4-15. The machine has a rotating head that dispenses
the mortar and a series of trowels that smooth it to the interior walls of the pipe. Before either process is
initiated, pipes should be thoroughly cleaned and dried.
— INI
HPBT»R h«SE
P.LLUNG CABLE
MM
MM
MM
MM
= nn = nn =
= nn = nil = nil = i
Rotary Trowell Method of Lining Pipe
TFIl
:L_LLLL
_LLIJ_=_1LIJ_=_LUU=_LLIJ_=_11.IJ_=_1LU_;
Figure 4-15. Dakota Pipelining Large Diameter Projectile Method (www.dakotapipelining.com)
One of the main limitations of this technique is that the length of water main that can be lined between
excavations is dependent on the length of the hose and cable and the diameter of the pipe. The maximum
working distance between excavations in winch-controlled processes is 750 ft for 10 to 12 in. pipes. The
maximum working distance will decrease as the diameter of the pipe decreases to approximately 350 ft
for 4 in. pipes. In applications where an operator controls the machine from inside the pipe, the distance
between excavations can be up to 1,500 ft. Generally, the longer the length of pipe that can be lined in
one operation, the lower the cost will be per unit length for the same diameter.
When lining smaller pipes up to 24 in. in diameter, service connections are blown through with
compressed air to remove mortar blockage before it sets. In larger pipes, the connections can be plugged
before lining. After placing the mortar, the pipe ends are capped to keep the pipe free from moisture
during curing. Exposed pipe can be sprayed to keep it cool and prevent cracking. After CCTV or person
entry inspection of the overall surface finish and absence of local defects, the line can be returned to
service. Defects can be repaired by patching, but machine application is preferred for defects extending
around the full circumference.
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Shotcreting is an additional method of application of a cement-based lining that can be used for point
repair and larger sections of large diameter pipes and water tunnels. The low water-cement ratio mortar is
sprayed at the pipe wall and although there can be large volumes of waste, about 75% of the mortar
remains. The mortar can be sprayed over reinforcing bar or wire mesh. This method has most commonly
been used for the renewal of storm water drains. It may be applicable to water transmission pipes, but
with some loss of diameter due to the thickness of shotcrete applied. Reinforced shotcrete can improve
the structural strength of the pipe, but design is inexact and it is most usually a repair method.
4.2.1.2 Epoxy Lining. The process for in situ epoxy resin relining of iron and steel pipelines was
developed in the UK in the late 1970s and has been performed in North America since the early 1990s.
The epoxy materials approved for use were first certified to NSF/ANSI Standard 61 in 1995. Epoxy
lining of potable water mains is currently classified as a non-structural renewal method. The process
involves cleaning the pipe to remove existing corrosion buildup and then spraying a thin 40 mil (1 mm)
liquid epoxy coating onto the inner wall of the pipe. The coating cures in 16 hours and provides a
smooth, pinhole free and durable finish thought to be resistant to mineral deposits and future buildup of
tuberculation. Most lining machine models are computer controlled with warning devices that alert
operators if the minimum lining thickness is not being achieved. A lining machine applies the epoxy
material with an application head attached to the lining hoses.
The applicator head and hoses are pulled to the far end of the cleaned pipe and then winched back through
the pipe at a speed linked to the rate of supply of the resin mixture. After lining, the ends of the pipe are
capped and the resin is allowed to cure overnight at ambient temperature. The pipe is then flushed,
disinfected, and returned to service. Epoxy lining involves the application of complex epoxy bisphenol
amines and hardeners to the interior surface of pipes. In the U.S., this method has not seen widespread
use and its application was restricted to industrial pipelines until the NSF/ANSI Standard 61 approval was
obtained for epoxy materials in potable water mains.
More so than for many other lining techniques, pipelines must be thoroughly cleaned, free from corroded
material, and dried before application of the epoxy lining. The epoxy is required to bond to the metal
surface to provide durable service for the expected service life. The WaterRF report Service Life Analysis
of Water Main Epoxy Lining states that properly constructed epoxy linings can be expected to last 40 to
60 years, but various defects can significantly reduce this longevity (Deb et al., 2006). The defects,
however, can be reduced or eliminated by implementing careful QA/QC procedures during lining
application.
Epoxy resin is applied to the wall of the pipeline using a centrifugal method. A spinning head is winched
through the pipeline at a constant rate depositing the heated pre-mixed epoxy and hardener mixture onto
the pipe wall. The material and air supply for the motor are contained in an umbilical cord, which also
forms part of the winching system. It is possible to use NSF/ANSI Standard 61 certified, spray applied
epoxies to renew large diameter pipes which may require a higher resin build than normal for rapid return
to service. Adequate cure time must be allowed for the epoxy lining to harden before putting the main
back into service, which can be a problem in cold climates where an excessive cure time may be required.
Several epoxy products are NSF/ANSI Standard 61 certified for potable water systems currently
including: HydraTech Waterline, RLS Solutions AquataPoxy®, and Warren Environmental S-301 Epoxy
(Warren and Nance, 1997). It is important to verify that epoxies for water pipe rehabilitation are designed
and approved for rapid return to service and to check the certification for specified conditions of use,
particularly in respect of permitted pipe diameter, thickness, and cure temperatures. Not all NSF/ANSI
Standard 61 certified epoxy materials are suitable for field application and rapid return to service.
Listings are regularly updated and currently may be verified on the NSF Web site (www.nsf.org).
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4.2.1.3 Polyurea Lining. In 2009, 3M Corrosion Protection Products acquired the business of E
Wood Ltd., makers of the Copon™ Hycote range of polyurea coatings approved by the UK Drinking
Water Inspectorate for spray-on lining and immediate return to service. Copon™ Hycote 169 is marketed
in North America as Scotchkote™ 169 (Figure 4-16) and is NSF/ANSI Standard 61 approved for a
maximum wall thickness of 80 mils (2 mm) with 3M specifying 40 mils (1 mm) as the target thickness in
its guidelines. 6,000 miles of water mains have been lined with this material since its launch by E Wood
in 2000, mostly in the UK and Canada.
A high build version of this material (Hycote 169HB) has been used in the UK to provide more than 200
miles of 3 to 5 mm linings for regional water companies, but it was not successful in obtaining NSF/ANSI
Standard 61 approval (Najafi et al., 2009). Accordingly, a modified polyurea material marketed as
Scotchkote™ 269 semi-structural lining was approved and launched in North America early in 2009, but
due to failures in field applications a new product called Scotchkote™ Renewal Liner 2400 was launched
in 2011 (EPA, 2012a).
Figure 4-16. 3M Scotchkote™ 169HB Lining (www.3m.com)
Another polyurea lining product available since 2007 for use in potable water pipelines is the Acuro
Polymeric Resin Lining (Figure 4-17). This product has been used predominately in Canada and also in
Cleveland, OH. The product meets ASTM F-1216 structural requirements and is applied in increments of
about 1 mm each, to a total thickness of 3 mm and up, depending on the pipe's characteristics and
requirements. Acuro lining materials can be used to form non-structural, semi-structural, or fully
structural rehabilitations and same day return-to-service is possible.
ficuro
PittS-Pit*6 |
-------
4.2.1.4 Polyurethane. Fast-Line Plus™ polyurethane lining is manufactured by Subterra, a division
of Daniel Contractors Ltd., UK. The product is currently seeking NSF approval for both a 1 mm and high
build version. Like two-component epoxy resin systems, polyurethane resins are applied by a centrifugal
spray lining machine. The thickness of the coating is controlled by the resin flow rate and the forward
speed of the machine. The resin base and hardener are fed through separate hoses and combined in a
static mixer just behind the spray head. The resin is applied to the prepared internal surface of the pipe,
forming a thick coating, preventing water penetration, and corrosion. Cleaning and condition assessment
must precede this activity, while disinfection, inspection, and proper curing follow the job. Generally,
there is no need to excavate service connections since the spraying application rarely blocks the
connection.
This product and other fast-setting high build polymers have potential for water main lining and they have
been used in various European countries. Such developments when confirmed and NSF/ANSI Standard
61 certified could help utilities in cutting down direct costs incurred during water main lining in bypass
pumping and minimize indirect social and economic costs.
4.2.2 Sliplining. Sliplining is a method of pipe rehabilitation in which a new pipe of smaller
diameter is inserted directly into the deteriorated pipe by pulling or pushing. This technique, when
undertaken by contractors using proprietary NSF/ANSI Standard 61 certified pipe products, will provide a
serviceable pipeline with some loss of cross section, typically a loss of at least 3 inches (75 mm) in
diameter in water mains, and may be a viable option depending upon hydraulic requirements. Cross-
sectional loss can be minimized by using stronger pipe materials, which allows for a thinner wall for a
given pressure rating than with weaker pipe materials. The line being rehabilitated will normally have a
decreased coefficient of friction after being sliplined, which reduces some of the effect of the reduced
cross section. Sliplining may be accomplished by insertion of short lengths of pipe, joined during
insertion, or longer lengths of pipe welded at or near the work site to provide a continuous length of pipe
for insertion, as outlined in Figure 4-18.
Sliplining
Continuous
Figure 4-18. Summary of Sliplining Technologies
Sliplining may be a very cost effective option, especially when a fully structural replacement is needed.
Access requirements for the insertion of continuous pipe can be considerable in order to bring the pipe
down to the proposed alignment while not exceeding the maximum bending radius of the insertion pipe.
Sliplined pipe should be grouted in place to secure the pipe and distribute the load uniformly.
4.2.2.1 Segmental Sliplining. Segmental sliplining uses short pipe segments that are assembled at
the entry point of the existing pipe where the liner is pulled or pushed into the pipe for the length of each
added segment. After installation of the entire slipliner, the annular space is grouted. Care must be taken
during grouting that the grouting pressure does not exceed the buckling resistance of the liner pipe.
Sliplining pipes can be HDPE, PVC, centrifugally cast fiberglass reinforced polymer mortar (CCFRPM)
pressure pipe (i.e., HOBAS, Figure 4-19), steel, GRP, or DI. Pipe with spigot and socket joints contained
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within an expanded bell socket are not usually appropriate for sliplining because the additional cross
section required for the spigot and socket joint will reduce the cross sectional area available for the liner
pipe substantially. However, some types of socketed pipe supplied with a restrained joint may be pushed
or pulled in place if required.
Figure 4-19. Segmental Sliplining using HOBAS Pipe (courtesy of HOBAS Pipe USA)
4.2.2.2 Continuous Sliplining. Continuous sliplining uses a liner that has been manufactured as a
continuous pipe or one that is assembled in the field prior to insertion to match the entire length of the
existing pipe. Continuous sliplining pipe can be HDPE, fusible PVC pressure pipe, or welded steel. PE
pipe has been successfully welded for more than 30 years and working codes and regulations have been
established to ensure that weld processes and practices can be reliably implemented. Manufacturers'
recommendations in terms of operator training, welding pressures, and temperatures and all aspects of site
practice should be followed. Small diameter pipe delivered to the work site in coil form should be
straightened prior to welding, and proprietary equipment such as the McElroy Line Tamer™ and
PolyHorse™ can be used to improve operating efficiency and reliability.
Welding of PVC pipe was commercially introduced in 2004 and over 3,500,000 ft have been installed
with trenchless methods. Fusible C-900® can be used for long length sliplining operations among other
replacement techniques as shown in Figure 4-20. Fusible PVC® pipe is extruded from a specific
formulation of PVC resin (cell class 12454), which allows the joints to be butt fused together using the
manufacturers' fusion process (Botteicher, 2008).
•^••••^^^•^••UH^^^^H ^^^^^^^^^^H
Figure 4-20. Continuous Sliplining by Fusible PVC (www.undergroundsolutions.com)
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Industry standard butt fusion equipment is used with some minor modifications and the resin compound
meets the PVC formulation in the Plastic Pipe Institute (PPI) Technical Report #2 (PPI, 2011). The
fusible pipe is made in ductile iron pipe standard (DIPS) and iron pipe size (IPS) outside diameter (OD)
sizes. For sliplining, the host pipe is cleaned and inspected with CCTV. Depending on site logistics, the
Fusible PVC® pipes can be strung out and the joints butt fused above grade prior to insertion, or butt
fused in the pit if dimensions allow. For pipe bursting or horizontal directional drilling (HDD), the pipe
is normally butt fused in a single length and static burst methods are used. The fused PVC pipe is either
winched into the host pipe if sliplining, or pulled in behind the expansion head when bursting. A non-
rigid connection from the pipe to the expansion head is used. In all installation methods, the maximum
recommended pull force and the minimum recommended bend radius must be followed.
Fusible C-900® 4 to 12 in. and Fusible C-905® 14 to 36 in. are available for potable water applications
and FPVC® 4 to 36 in. is available for potable water in other than C-900®/C-905® dimensions and non-
potable applications. Renewal length of fusible pipes is 300 to 500 feet for pipe bursting with lengths of
over 1,000 feet completed in a single burst. Sliplining of 3,500 feet in a single pull and horizontal
directional drilling of over 6,400 feet in a single length have been accomplished. The fusible range of
products meets ASTM cell classification 12454 and the Fusible C-900®, Fusible C-905®, and FPVC®
pipes are NSF/ANSI Standard 61 certified for potable water. Products comply with AWWA C900
(2007b), AWWA C905 (2010), ASTM D-1785 (2006a), and ASTM D-2241 (2009b).
4.2.3 Cured-in-Place Pipe. CIPP lining is a well established lining method in which a resin-
saturated tube is introduced into the pipe by air or water inversion or pulled into place with a winch, and
expanded using air or water pressure. The resin is subsequently cured at ambient or elevated temperature
(using steam or hot water), or using ultraviolet (UV) light, to create a new pipe. The resin-impregnated
fabric forms a new pipe wall in close contact with and conforming to the host pipe wall. Depending on
the materials used and the thickness of the new pipe, it can be considered as a fully structural or semi-
structural liner. Variations on this technology have been used for sectional or spot pipe repairs as well.
This technology has been widely used in gravity and low pressure wastewater and storm water
applications. It has also been used to renew raw water mains and water distribution pipe where local
regulations permit.
Over the years there have been many new variations made to the original patented CIPP product
introduced by Insituform in the early 1970s. As Figure 4-21 shows, variations exist in resin types,
installation methods, curing methods, and tube construction and only some of these options are applicable
for water main rehabilitation. The requirements of NSF/ANSI 61 determine the type of resin or resin and
coating that can be employed. Currently, UV curing is only being used in sewer systems.
Various Insituform products have been used for pressure applications since the mid 1970s. Initially,
coated felt liners impregnated with thermoset resins were used to line cooling mains, industrial process
pipes, and raw water and this usage has continued intermittently with some product development.
Current pressure pipe lining products include Insituform's Pressure Pipe Liner (PPL®) and InsituMain®,
Sekisui NordiTube's NORDIPIPE™, and Sanexen Environmental Services' Aqua-Pipe®, all of which are
certified to NSF/ANSI Standard 61 (Heavens and Gumbel, 2004). These products have been used in
water mains applications in the Europe, North America, and Asia.
In the early 1980s, collaboration between Japanese gas companies and their suppliers gave rise to hose
lining products, which are polymer coated woven polyester fabrics bonded to the mains using epoxy
resin. Paltem and Phoenix (also known as TUBETEX™) were well established products developed as
Type II gas main liners which have evolved for use as AWWA Class III and Class IV (AWWA, 200 Ib)
water mains liners. The current version offered in North America by Sekisui NordiTube, Inc. is
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NORDIPIPE™. There are a number of other products developed in Europe seeking entry into the North
American market such as Starline® Trenchless Technology.
ICIPP
Variants
LTube
Construction
H
;
4
l i
Resin
Felt
Composite
Resin
Glass Fibre
Composite
Cure
Method
Resin
Type
Inversion
Method
Ambient
Polyester
Ultra Violet
Light
Figure 4-21. Summary of Cured-in-Place Pipe Technologies
For CIPP rehabilitation, prior to installation, the water main is typically prepared by cleaning to restore
the cross section of the host pipe by removing encrusted corrosion product and then plugging the existing
services to prevent resin migration into the service. Cleaning is usually undertaken by drag scraping, high
pressure jetting, or rack feed boring. The pipe surface should be free from debris and running or static
water, particularly if the lining system involved is required to bond to the pipe wall. Where installation
involves an inversion procedure, the inversion pressure may be developed using a column of water
contained within a drop tube suspended from a scaffold tower, a controlled head inversion process (CHIP)
unit, or an air or water inversion vessel (i.e., elephant, snail, torpedo, etc.). This pressure turns the resin
impregnated liner inside out while propelling it through the host pipe and pressing the resin-coated face
against the host pipe wall. The resin is then cured using hot water or steam. For water applications, the
tube can be made from PE or polyurethane (PU) coated fabric of woven polyester or glass-fiber, or non
woven felt and glass reinforcement. The resin used for water applications is typically epoxy, and the
product must be certified to meet NSF/ANSI Standard 61 requirements for contact with potable water.
Equipment used for the installation is dedicated for the water application to minimize risks of cross-
contamination from other non-drinking water pipeline applications.
How the service connections and end seals are treated is particularly important for water pipe
rehabilitation. Service connections and any cut ends or extremities of the CIPP need to be pressure tight
to prevent tracking behind the liner through any annulus which may be present between the liner and the
host pipe. Service reinstatement may be undertaken externally by access to the lined pipe by local
excavation from the ground surface or internally by location and reinstating using a cutter to reopen the
connection. In various developments, a multi-task robot is used to reopen the connection and reinstating
services robotically (i.e., Insituform, Progressive Pipeline Management [PPM], Aqua-Pipe, etc.).
Locating the position of the existing connections after lining can be difficult. Careful survey and
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measurement from a defined base datum are required and plugs can be placed in the service connections
to prevent resin blockage. Some novel location techniques using magnets placed by robot in the service
connection before lining have had some success.
Pressure testing for CIPP lined pipe is prescribed in ASTM F-1216 (ASTM, 2009a). It is recommended
that lined pipe be tested at twice the working pressure or working pressure plus 50 psi, whichever is the
lesser. It must be recognized that a thermoplastic or thermosetting resin liner will expand under the
imposed pressure and transfer load onto the host pipe. Accordingly it may be important to demonstrate
that the host pipe will sustain the test pressure prior to lining. It is good practice, where possible, to test
pressure capability before and after lining. During pressure testing, a stabilization period, which could
take anywhere from half an hour to three hours, should be allowed prior to testing to allow the system to
settle, and air should be carefully expelled from the system prior to testing.
4.2.3.1 InsituMain . InsituMain® is represented as an AWWA Class IV fully structural pressure
rated CIPP technology for transmission and distribution mains. It was introduced into the market in
March 2009. The InsituMain® system, as shown in Figure 4-22, relies on a polyethylene-coated, woven
glass and polyester fiber lining tube impregnated with an epoxy resin and InsituMain® is certified to
NSF/ANSI Standard 61.
.Resin/polyester felt layers
Liner coating
(wetted surface)
Resin / Fiberglass layer(s)
Figure 4-22. Cross Section of InsituMain® (courtesy of Insituform)
The resin impregnated tube is inserted into the host pipe by either a pull-in or inversion method, and hot
water is used to cure the thermosetting resin. The pipe is cooled, tube ends are cut off, service
connections re-opened, and after disinfection the pipe is returned to service. Lined sections are re-
established to the existing system using standard pipe fittings.
InsituMain® is currently aimed at water main lining projects in the range of 6 to 36 in., with the largest
project to date being 24 in. and a successful field test of 36 in. The liner is designed and tested using the
procedures set out in ASTM F-1216 and physical property requirements are set out in ASTM F-1216
(2009a) and ASTM F-1743 (2008c). InsituMain® is suitable for applications having operating
temperatures up to 120°F and operating pressures of 150 psi. The product can handle bends up to 45°, but
the number and location of the bends in which the product can be used is evaluated on a case-by-case
basis for factors such as pipe geometry and layout. Service connections can be made by a robotic remote
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access system. Projects have been completed in several states including Illinois, Arizona, Florida, Texas,
New Jersey, and Missouri.
4.2.3.2 Aqua-Pipe9. Sanexen, in collaboration with the National Research Council (NRC) of
Canada, developed Aqua-Pipe® around the year 2000. At present, the company advises that more than
1.5 million linear feet has been installed throughout North America. The company has different licensees
in North America and has undertaken a small number of projects in the U.S. (e.g., New York City,
Cleveland, Minneapolis, Atlanta, etc.). The Aqua-Pipe® liner consists of two woven polyester jackets, of
which the inner jacket has a PU coating. The liner is impregnated at the work site in a purpose built
vehicle where the resin is injected between the jackets and distributed by feeding the liner through a nip
roller. The liner is designed and tested in accordance with the procedures set out in ASTM F-1216 and
physical properties are determined in accordance with ASTM F-1216 (ASTM, 2009a). The cross section
can be seen in Figure 4-23.
Figure 4-23. Aqua-Pipe Cross Section (courtesy of Sanexen)
Aqua-Pipe® is available in diameters of 6, 8, 10, and 12 in. and has a pressure capability of up to 150 psi
(10 bar). The smooth PU coating provides for a Hazen-Williams coefficient of 120 or greater. Aqua-
Pipe® can be installed in lengths up to 500 feet between access pits. The Aqua-Pipe® liner is installed by
pulling the liner in place and pushing a pig through the liner using water pressure to form the liner to the
pipe wall. Circulating hot water for two hours and then holding under pressure for up to 12 hours
completes the curing process. The service connections are reinstated from within using a remote
controlled mechanical robot to cut open the taps. Aqua-Pipe® is certified to NSF/ANSI Standard 61 and it
has also been certified to the Bureau de Normalisation du Quebec (BNQ) Standard 3660-950 (BNQ,
2003).
4.2.3.3 NORDIPIPE™. NORDIPIPE™, from Sekisui NordiTube, Inc., has its origins in the hose
lining technology transferred by Osaka Bosui to Le Joint Interne in 1983. Process Phoenix
(TUBETEX™) became well established in Europe and evolved through a chain of ownership including
NordiTube and Chevalier Pipe Technologies to its present ownership. TUBETEX™ is a polyester woven
hose coated with PE, which is impregnated with epoxy resin and inverted by air from a pressure vessel
into the host pipe and pressed and bonded against the pipe wall while being cured with steam. A Hytrel
polyester version is used for gas pipe lining. The product is widely used for diameters of 4 to 40 in. (100
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to 1,000 mm) in Europe and Asia for gas and water pipe lining. In North America, the company offers its
higher performance NORDIPIPE™ product for water and force mains and its cross section is shown in
Figure 4-24.
fell impregnated with epoxy resin
host pipe
glass-fibre reinforcmenl
PE-coating
NORDIPIPEIM with two glass-fibre
reinforcement Layers
host pipe
U impregnated with epoxy resin
glass-fibre reinforcement
felt impregnated with epoxy resin
PE-coaling
NORDIPIPE1" with a single glass-fibre
reinforcement layer
Figure 4-24. NordiPipe™ Cross Section (www.sekisuispr.com)
NORDIPIPE™ is a AWWA Class IV fully structural pipe liner and can be used for pipe diameters of 6 to
48 in. The liner is a glass reinforced felt impregnated with epoxy resin. The thickness of the pipe liner
ranges from 0.18 to 0.94 in. (4.6 to 24 mm). Once in place, the system is rated for operating pressures up
to 250 psi. Operating temperatures vary with different impregnating materials, i.e., 100°F with epoxy and
160°F with vinyl ester. The system can achieve renewal lengths up to 1,000 feet in certain conditions.
The NORDIPIPE™ liner is designed and tested in accordance with ASTM F-1216 and has been granted
potable water approval in accordance with the Australian/New Zealand Standard (AS/NZS) 4020 (2005),
Water Regulations Advisory Scheme (WRAS) British Standard (BS) 6920 (WRAS, 2000), NSF/ANSI
Standard 61, and BNQ Standard 3660-950. The liner can be installed by water or air inversion or pulled
in place and inflated. It can be cured with air, steam, or hot water. The service connections can be
reinstated by robotics. Key installation check points include resin yield check for impregnation, pressure
gauges for air inversion, temperature monitoring during cure, hydrostatic pressure test, and post-
installation video for acceptance.
4.2.3.4 Starline9 2000/HPL-W. Starline Trenchless Technology LLC, a joint venture between the
Gas Research Institute (now the Gas Technology Institute, GTI) and Karl Weiss GmbH, a Berlin-based
rehabilitation specialist, was formed in 1999. The most widely used Starline product is Starline 2000,
which can be used on diameters ranging from 3 to 40 in. for pressure up to 100 psi. Starline 2000 has
successfully demonstrated a UV cure option which has been used by PSG&E, National Grid, and
Consolidated Edison. Figure 4-25 illustrates the cross section of the HPL-W product designed for high
pressure water main rehabilitation. Starline's licensee, PPM, has installed the product in fire water lines
at Exelon Nuclear Power and in lines for TW Phillips Gas and Oil. Karl Weiss GmbH has some success
and experience in selling and installing products for water pipe rehabilitation in Europe and it is likely
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that the Starline 2000 and HPL-W products could be employed in North America with a suitable
distribution partner. Once NSF/ANSI Standard 61 certification is achieved, these Starline products can be
used for rehabilitation of drinking water mains with diameters up to 40 in. and operating pressures up to
450 psi.
Pipeline
Adhesive
Seamless Fabric
Impermeable Surface Layer
Figure 4-25. Starline HPL-W Cross Section (www.starlinett.com)
Other products include Starline HPL-G 180, a hose lining product for 6 to 48 in. gas pipe rehabilitation
for pressures up to 180 psi. Also, Starline 1000 is a 4 to 24 in. CIPP hose lining technology using a
polyester woven hose and epoxy resin to bond to the host pipe. It is fully approved for use in gas and
water in Germany by Deutscher Verein des Gas- und Wasserfaches (DVGW) the German Technical and
Scientific Association for Gas and Water. It is a hole and gap spanning liner, AWWA Class II, bonded to
the host pipe and capable of spanning 2 in. (50 mm) diameter holes and gaps at its rated pressure
capability. All of the Starline products mentioned above require a clean, dry surface for ideal bonding
and preparation for lining which usually involves sand blasting. Connections are reopened by robotic
cutter and end seals may be used for fitting flange connectors and spool pieces. The liners can negotiate
multiple bends up to 45° depending on pipe diameter, location and number of bends.
4.2.4 Inserted Hose Lining. Inserted hose liners can be woven from polyester or Kevlar® and
coated on the inside and out with PE or entirely PE. These liners are winched into place in factory folded
shapes and reverted to a round shape with the use of air, steam, or water.
4.2.4.1 Thermopipe®. Developed in the UK in 1992 by Angus Flexible Pipelines Ltd., Thermopipe®
was acquired by Insituform Technologies, Inc. and introduced in the U.S. in 1997. More than 800,000 ft
of Thermopipe® has been installed worldwide. As shown in Figure 4-26, Thermopipe® is a woven
polyester fiber jacket coated inside and out with PE. It was designed for rehabilitation of water
distribution mains and other pressurized piping systems. Prior to lining and once the bypass has been put
online, the service connections are located and the pipe is cleaned to restore the cross section by scraping,
high pressure jetting, or rack feed boring.
Thermopipe® is available in thicknesses ranging from 0.08 to 0.2 in. and diameters ranging from 2.75 in.
(0.08 in. thick) to 12 in. (0.2 in. thick). Thermopipe® has a pressure rating of 170 psi (230 psi for 4 to 8
in. diameters). Supplied as a factory-folded "C" shape liner with up to 1,600 ft on a reel, the
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Thermopipe® liner is pulled into the host pipe (Figure 4-27) by a winch and reverted to its original shape
with air and steam. Once heated and inflated, the liner forms a close-fit within the host pipe, creating a
jointless system. The installation process can usually be completed within 3 to 4 hours. Thermopipe®
can accommodate bends up to 45°.
Pn)*iqkne malm
encapsulates and surrounds
the uoryeslf c reinforcemwil
Figure 4-26. Thermopipe Cross Section (www.insituform.com)
Pressure testing is carried out after the liner has cooled to the original ambient ground temperature and
before reinstatement of the service connections. End seals, mechanical joint couplings, or similar fittings
are used to clamp the ends of the hose liner to the existing pipe and provide flange connections for
reinsertion of a spool piece.
Figure 4-27. Installation of Thermopipe (courtesy of Insituform)
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Service connections can be reinstated eternally by excavation, followed by tapping a hole in the host pipe
and liner and fitting an external fitting to the liner. In pipe 6 in. and greater, service reconnections can be
reinstated internally using a remote controlled robotic system. The Thermopipe® liner may be tested to an
internal pressure equal to twice the known operating pressure, or operating pressure plus 50 psi,
whichever is less. Thermopipe® is currently being used in limited installations in the U.S. market by
Insituform.
4.2.4.2 Primus Line®. Primus Line® also is a woven plastic coated liner and has been developed by
Radlinger in Germany. The woven hose is made from Kevlar® and the coating that encapsulates the
reinforcement is PE as shown in Figure 4-28. The liner is pulled into the host pipe and inflated so the
liner ends and service connectors can be attached and the line disinfected before return to service.
Because of the nature of the reinforcement, Primus Line®, which is offered in diameters up to 18 in., can
accommodate operating pressures up to 1,000 psi (using a double layer in a 6 in. pipe), depending on pipe
diameter and design (i.e., single or double layer). The liner can be installed in lengths up to 6,000 ft.
Experience is in Germany, Austria, Italy, France, Belgium, Russia, Ukraine, Kazakhstan, and Brazil.
Figure 4-28. Primus Line (www.raedlinger.com)
4.2.5 Close-Fit Lining. Close-fit lining is a family of methods, shown in Figure 4-29, for pipe
rehabilitation in which a thermoplastic liner pipe is temporarily deformed, either in the field or at the
manufacturing factory, to reduce its cross section before its insertion into an existing host pipe. The
deformed liner is subsequently restored to its original diameter forming a close-fit with the original pipe.
Close-fitting PE liners can be classified as Class II and Class III (i.e., semi-structural) or Class IV (i.e.,
fully structural) liners depending on the liner pipe standard dimension ratio (SDR) and the operating
pressure of the host pipe (AWWA, 2001b).
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L Close-Fit
Lining |
Symmetrical
| Reduction/Reduced |
Diameter Pipe
I
L Tension Compression Expandable Grout-in Place I Factory On-site
Based Based PVC Pipe Folded Folded
Figure 4-29. Summary of Close-Fit Lining Technologies
Close-fit lining methods can be used to install a semi-structural AWWA Class II and III liner in the host
pipe, typically SDR 22 to 61. The liner is installed in the same way as a structural liner but uses a thinner
wall pipe, which on a final installation and reversion relies upon the host pipe for sufficient structural
strength to resist internal pressure. These hole and gap spanning liners can be designed to have sufficient
stiffness to resist external buckling forces and vacuum pressures without collapse when the pipeline is out
of service or running at less than full flow. The utilization of this technique is ideal for situations where
the existing potable water pipe is in relatively good structural condition but suffers from joint leakage,
internal corrosion, water quality, or tuberculation problems. The loss of cross section is small and the
hydraulic capacity can be restored or improved as the lining material provides a smooth bore with a lower
friction coefficient than the rougher host pipe.
Thicker walled liners require more effort to deform, but when installed can provide a fully structural
AWWA Class IV liner that will support the internal pressure in the event that the host pipe fractures or
fails due to external corrosion. These liners can also withstand the external forces due to soil and traffic
and, importantly, withstand the rapid transfer of load when the host pipe fails.
The objective of close-fit lining is to overcome the traditional problems of sliplining (i.e., significant
reduction in pipe cross section and an annular space between the host pipe and the newly inserted pipe).
In this technique, the liner pipe is deformed either in field or during manufacture to reduce its diameter
for insertion into the host pipe. The PE or PVC pipe is selected and sized according to the required stand-
alone pressure and the host pipe interior size. In fully structural close-fit lining, the host pipe is used
solely to sustain the hole in the ground for installation purposes, as it ultimately makes no contribution to
the performance of the new replacement pipe. The close-fit liner will operate as a stand-alone pipe able
to take on all the imposed loads and perform as a fully structural pipe. With the pipe in its deformed
condition, it becomes a sliplining operation to install the new pipe into the host pipe. After the
installation into the host pipe, the new pipe is reverted back to its original size usually by application of
internal pressure, resulting in a tight fit between the replacement pipe and the host pipe, thus maximizing
the available diameter of new pipe. Existing services are reinstated by direct excavation, robotic, or man
entry methods.
The installation of close-fit liners may require lengthy access pits to install continuous liners, particularly
in larger diameters and lower SDRs where the longitudinal stiffness of the liner will not easily permit the
change in alignment from ground level to the level of the host pipe. Lengthy insertions will also demand
good and extensive access for stringing and welding the liner pipe prior to insertion. Attention to safe
storage of the pipe on site, clean and dry surfaces for welding, and the avoidance of abrasion damage
when pulling it in is important to the longevity of the installed pipe. Care must also be taken to protect
the public when storing and moving long lengths of pipe.
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Thermoplastic pipes may be deformed and inserted into the host pipe and reverted to their original size or
inserted and expanded to form a close fitting liner. Deformed and reformed pipes can be reduced in cross
section by pulling or pushing through a die or folded (either in the field or in the factory prior to delivery
to the project site). Where folded, small diameter pipe, typically up to 15 in. (450 mm), may either be
deformed after extrusion and delivered to the work site on a reel, or folded at the work site. Larger pipe
will typically be deformed at the work site. The reversion or expansion process, particularly for stiffer
PVC pipe, will involve the use of steam to soften the pipe material to facilitate the process. With folded
liner pipes, it is important that the liner is sized always slightly less than the internal circumference of the
host pipe to ensure the reformed liner cross section is fully rerounded and circular.
4.2.5.1 Fold and Form Close-Fit Liners. Fold and form liners can be PVC or PE. The liner folding
can occur in the factory or at the site prior to liner installation. The liners are typically winched into place
and then reverted back to their original shape by air or water pressure.
4.2.5.1.1 Subterra Subline. Subline, a close-fit PE lining technique, was developed by Subterra in the
UK in 1986. It is a relatively thin-walled semi-structural liner able to accommodate some bends in the
host pipe. Installations of 3,000 feet (900 m) in length can be achieved in a single insertion. The business
was acquired in 2008 by Daniel Contractors Ltd., a UK based construction and renovation specialist.
The pre-welded PE pipe is pushed through a former to fold it and it is temporarily held by restraining
bands as shown in Figure 4-30. The reduced cross section creates sufficient clearance to facilitate the
installation of the liner into the original pipe accommodating joint offsets and local deviations from
alignment. Once installed, the folded pipe is reverted back to its circular form by pressurization with
water at ambient temperature, which breaks the temporary restraining bands (Boot and Toropova, 1999).
This creates a close-fit liner within the host pipe, sealing leakage and preventing corrosion. It is
important that the liner is sized slightly less than the internal circumference of the host pipe to ensure the
reformed liner cross section is fully rerounded and circular. If the liner external diameter exceeds the host
pipe internal diameter, the reverted liner will not be fully circular and this may compromise buckling
resistance in the event of external hydrostatic pressure or vacuum loads.
Figure 4-30. Section of Subline (www.subterra.co.uk)
The liner is available in the market in diameters ranging from 3 to 60 in. It uses standard PE 80 or PE
100 designated pipes, SDR 26 to 61. Subline PE liner pipes can typically negotiate long radius pipeline
bends of up to 22.5°, depending on their number and location on the section being lined. Subline
demonstration projects have been undertaken in the U.S.
4.2.5.1.2 InsituGuard® - Folding. InsituGuard® is usually an AWWA Class III semi-structural or
Class IV fully structural liner depending upon SDR, pipe resin grade, working pressure, and host pipe
condition. InsituGuard® is offered in two versions denoted as folding and flexing types, describing the
process of deformation utilized prior to insertion. In the folding version, the SDR of the pipe is typically
SDR 17 or higher and is available in the market in diameters of 12 to 48 in. The pipes are pressure rated
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up to 125 psi for fully-structural applications (i.e., Class IV) and lengths of up to 2,000 feet can be
installed depending on winching capacity, existing pipe conditions, bends and valves, and the site
footprint.
Introduced in the U.S. market in 2001, this product is similar to Subline in principle. Both are methods of
site folding high-performance PE pipe prior to insertion into a new or existing pipeline and reversion to
achieve a close-fit liner against the inner wall of the host pipe, as shown in Figure 4-31. It differs from
Subline in some details of the apparatus for folding.
Figure 4-31. InsituGuard - Folding Apparatus and Restraining Bands (www.insituform.com)
Excavations are required for installation and to remove any existing fittings. Next, the PE pipe selected
for the project is welded into lengths suitable for installation, which can be the entire length or shorter
segments to accommodate available work space. The welded pipe is pushed by hydraulic-powered
clamping jaws through the folding machine, which alters the shape of the pipe, resulting in a diameter
reduction of up to 40% of the cross-sectional area. The shape is maintained by banding the folded pipe as
it exits the machine. The liner is first pulled into the host pipe, then cut to length and the end fittings are
attached, and finally pressurized to snap the restraining bands. Any intermediate fittings are installed,
service connections are excavated and reconnected, and the completed line is pressure tested, disinfected,
and returned to service. Access points are backfilled and reinstated.
4.2.5.2 Symmetrical Reduction/Reduced Diameter Pipe. Symmetrical reduction, sometimes called
reduced diameter pipe, uses a roller reduction box to reduce the diameter of a thin-walled PE pipe to
allow for insertion into the host pipe. Once fully inserted, the tension force can be released and the liner
reverts back to its original diameter.
4.2.5.2.1 Swagelining™. Swage lining™ was developed by British Gas in 1986 for renovation of gas
mains. It has been used to line gas, oil, and mining pipes and it is thought that about 1,500 miles have
been installed in water applications. The process was acquired by Swagelining Ltd. in 2009 and is
offered worldwide by licensed contractors. Originally executed by hot swaging, with improved
equipment and experience, cold or ambient swaging is now the usual form of process. The
Swagelining™ system uses a PE pipe with an OD slightly larger than the inside diameter of the pipe to be
lined (Wrobel et al., 2004). After sections of PE pipe are fused together to form a continuous pipe, the
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pipe is pulled through a reduction die, as shown in Figure 4-32, which temporarily increases its thickness
while reducing the outside diameter by about 10% and lengthens the pipe accordingly. The induced
deformations are largely viscoelastic, so that after release of the reduction die force, the lining natural
reverts to its original dimensions (Boot and Toropova, 1999). This allows the pipe to be pulled into the
existing pipeline.
W •
Figure 4-32. Swagelining™ Process (courtesy of Swagelining)
After the pipe has been pulled completely through the pipe, the pulling force is released and the pipe
returns towards its original diameter until it presses tightly against the inside wall of the host pipe. Due
allowance must be made for shortening of the liner as it reverts back to its original size. The tight fitting
liner results in a flow capacity close to the original pipeline design.
The Swagelining™ process can install diameters ranging from 2 to 60 in. (50 to 1500 mm) and can
achieve renewal lengths of up to 3,000 feet between excavations. Pulling force depends on the pipe rating
as well as whether or not the pipe is to be used as a semi or fully structural liner. Thicker liners, with
SDR in the 11 to 17 range, may require a powerful winching system and a supplementary pushing rig to
be employed to minimize the tensile force acting on the pipe. Installation pulling loads are designed by
Swagelining's proprietary software to ensure that max load is no greater than 50% maximum yield
strength of the material. PE pipes used in the Swagelining™ process are manufactured to local and
international standards and thus have clearly defined properties and an established expectation of service
life. Standard fittings are available to allow sections of PE-lined pipe to be reconnected to the rest of the
water transmission or distribution system. A wide variety of PE pipes and a full complement of tapping,
branching, and connection methods can be provided. It is critical that the tension on the lining is
maintained as it is being inserted; a loss of tension can allow the liner to increase in diameter and become
stuck in the host pipe.
4.2.5.2.2 Subterra Rolldown. Rolldown is a close-fit PE lining technique, developed by Subterra in
the UK in 1986 for British Gas. It can install a fully or semi-structural liner for a deteriorated pipe. In the
Rolldown process, standard grade PE pipe slightly greater than the pipe to be lined, as shown in Figure 4-
33, is gripped by hydraulic clamps and pushed through concentric rollers, which reduce the outside
diameter of the liner pipe by about 10% to allow it to be pulled through the host pipe (Boot et al., 1996).
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The diameter reduction is stable at typical ambient temperatures and the installation and reversion to its
original size may be undertaken quite separately, days or even weeks after the initial reduction.
Figure 4-33. Rolldown Process (www.subterra.co.uk)
The diameter reduction in such processes is up to 10% and it is generally carried out using PE 3408 (PE
80) or PE 4710 (PE 100). Rolldown can be undertaken in diameter ranges from 4 to 20 in. with SDR 11
to 33, and can negotiate bends up to 11.25°. Thin liners are not suitable because they may buckle during
the reduction process. After insertion, the liner is pressurized hydraulically with cold water to revert it to
a close-fit with the host pipe. Lengths in excess of 4,000 ft (1200 m) have been installed and
demonstration projects of Rolldown have been undertaken in the U.S.
4.2.5.2.3 Tite Liner®. Tite Liner® was developed by United Pipeline Systems in 1985 and has
achieved success in industrial pipeline protection. It is a tension-based process, which uses a roller
reduction box, shown in Figure 4-34, to reduce the outside diameter of a thin walled PE pipe so that long
lengths, up to 2,500 feet, can be drawn into the host pipe and reverted by release of the pull force.
Typically 2 to 52 in. PE 3408, SDR 17 to 44, the liner forms a thin corrosion barrier in raw water, mineral
process lines, and in the energy sector. United Pipeline Systems was acquired by Insituform
Technologies, Inc. in 1996 and has provided a body of experience of PE pipe processing from which the
InsituGuard® range of products has been developed. It can be used to install a corrosion protection liner
using a pipe certified to NSF/ANSI Standard 61. As discussed above, the tension must be maintained
consistently during insertion.
Figure 4-34. Tite Liner Roller Reduction Box (www.unitedpipeline.com)
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4.2.5.2.4 InsituGuarcT - Flexing. The PE pipe selected for the project is welded into lengths suitable
for installation. The welded pipe is driven by rollers through a roller reduction box shown in Figure 4-35,
which alters the outside diameter of the pipe, resulting in a diameter reduction of up to 10% of the cross-
sectional area prior to insertion so that the liner can be winched into place. Once the reduced diameter
liner is installed, end fittings are attached and the liner is pressurized to form a close-fitting liner.
Intermediate fittings are installed, service connections are excavated and reconnected, and the completed
line is pressure tested, disinfected, and returned to service. Access points are backfilled and reinstated.
Figure 4-35. InsituGuard - Flexing Roller Reduction Machine (www.insituform.com)
InsituGuard® - Flexing uses high-performance PE pipe to develop an AWWA Class IV fully structural
liner or an AWWA Class III semi-structural liner. The pipes are also pressure rated up to 125 psi for
fully-structural applications and the technology can install lengths up to 2,000 feet depending on
winching capacity, existing pipe conditions, bends and valves, and the site footprint.
4.2.5.3 Other Close-Fit Liners. Other close fit-liners include expandable PVC and grouted in place
PE, which are outlined below.
4.2.5.3.1 Duraliner™. A close-fitting liner technology called Duraliner™ uses an expandable PVC
pipe, which has been developed for structural pipe rehabilitation. Duraliner™ has all of the usual
characteristics of PVC including resistance to water disinfectant induced oxidation and hydrocarbon
permeation. It also has a fusion capability and ease in connection with fittings and valves. The starting
stock, pipe sections typically 2 in. (50 mm) smaller than the diameter of the existing pipe, is fused
together and inserted into the entire length of the host pipe (Figure 4-36). The liner is fitted with end caps
and filled with water. Heat and pressure are applied to expand the pipe tightly against the internal
diameter of the host pipe. A computer control system is used to manage the process and equipment
parameters. As the line is expanded, the molecular structure of the PVC is reoriented to a circumferential
direction. This new molecular orientation increases the tensile strength properties of the liner and
compensates for the loss of wall thickness due to expansion.
DI mechanical joint fittings and DI push-on type fittings can be installed directly onto Duraliner™. Any
joint restraint devices that are commonly used with standard PVC can be used with Duraliner™. The
Uni-Bell PVC Pipe Association's guidance for tapping PVC is applicable to Duraliner™ installations.
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Figure 4-36. Butt-Fusion Welding of Duraliner™ (www.undergroundsolutions.com)
Duraliner™ works for 4 to 16 in. diameter pipes and can handle operating pressure typically up to 150
psi. The expanded pipe meets the performance standards for AWWA C900 and AWWA C905 PVC pipe
and the material conforms to cell classification 12454 as defined in ASTM D-1784 (ASTM, 2008d).
4.2.5.3.2 MainSaver™. MainSaver™ is a PE liner with anchors (i.e., closely spaced hooked tabs) on
the outside of the liner that serve as spacers maintaining an annulus to the inner surface of the pipe. The
annular space created is filled with a high strength cementitious grout, as shown in the cross section in
Figure 4-37. A rounding swab is passed through the pipe, applying air pressure, rounding the liner tube,
distributing the grout evenly against the interior surface of the host pipe, and filling all pipe surface
defects. It was developed in the UK as CemPipe and renamed on its launch in the U.S., where
approximately 7,000 feet has been installed. MainSaver™ is used to renew pipes with holes, displaced
joints, leaking joints, and maximum bends of 11.25°. It is NSF/ANSI Standard 61 certified for use with
potable water.
Host Pipe Substrate
3mm Thick Grout
MDPE Liner with Grout
Key Hooks
Figure 4-37. Cross Section of MainSaver™ (courtesy of MainSaver™)
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MainSaver™ is an AWWA Class III, semi-structural liner available for 4 to 12 in. pipes (Sterling, 2007).
The thickness of the system would be approximately 3 mm, but the grout will often be thicker where it is
filling pipe defects. It can renew lengths of approximately 500 ft. MainSaver™ installation requires a
minimum ambient temperature of 37°F or greater during installation. The product can sustain operating
pressures of up to 294 psi. All installed materials are NSF/ANSI Standard 61 certified for contact with
potable water. Cathodic protection can be restored to ferrous pipes to retard external corrosion.
4.2.5.3.3 Aqualiner. Aqualiner, which was developed by a consortium of three UK water
companies, a Danish contractor, and a plastics consultant, is patented process used to rehabilitate water
mains with a thin thermoplastic polymer composite liner in diameter of 6 in. to 12 in. (150 to 300 mm).
The process is referred to as melt-in-place pipe and the first trial was completed for Wessex Water in the
UK. The composite liner is made up of glass fiber reinforced polypropylene and a woven tube. Once
winched into place, the liner is heated by an electrically powered air driven heating pig that raises the
temperature of the liner to 200°C, melting the thermoplastic, and a removable silicon inversion bag is
used to pressurize the liner tightly against the host pipe. Pressure in the inflation bag is kept at 45 psi
until the liner cools, at which point the bag is deflated and removed. The finished liner is able to perform
as a standalone Class IV liner capable of handling the internal pressure, and external loads. The product
is BS 6920 potable water contact certified in the UK and the structural design procedures are based on the
methods describe in ASTM F-1216 (Boyce and Downey, 2010). There are no product standards yet for
this new class of liner product, but the closest applicable standard might be EN ISO 15874 Polypropylene
for Hot and Cold Water Installations.
4.2.6 Service Line Rehabilitation. A significant component in water distribution system
rehabilitation projects concerns service reinstatement and restoration or replacement of service lines.
Frequently short side service lines involve open cut works in sidewalks, yards, and gardens, whereas long
side replacements may require lengthy excavations in road pavements and restoration of costly traffic-
bearing surfaces. Renovation of service lines with longer runs may be an opportunity for a trenchless
replacement option such as impact moling, pipe bursting, or a trenchless rehabilitation method such as
lining. Traffic impacts and shallow burial may increase the likelihood of leakage and increase the need
for pipe renewal. Technologies that can be used for service line rehabilitation include the following.
4.2.6.1 Nu Flow Technology. Nu Flow Technology has an epoxy pipe lining process that can be
used for plumbing and domestic piping. The in situ epoxy lining solution minimizes the destruction and
disruption to the building. It can be used for lining lead, copper, and galvanized steel service connection
pipes ranging from !/> in. up to 10 in. Prior to epoxy lining, the pipe is sand blasted and blown through
with hot air to dry and remove debris (Boyd et al, 2000). Minimal building component and soil removal
is necessary with in situ lining, and access to the pipe from a valve or fittings is required to blow a thin
film (12 mils) of the epoxy through the plumbing system. Curing involves blowing hot air (100°F)
through for an hour followed by a 24 hour cure.
4.2.6.2 Flow-Liner NeofitProcess. The Neofit Process, developed for !/2to l!/2 in. service
connections in 1998 by Wavin, is available through master distributor Flow-Liner® in North America.
The process involves insertion of a small diameter polyester tube, as shown in Figure 4-38, which is
expanded to 2 to 2.5 times its original diameter using hot water and pressure. Thus, it provides a barrier
layer, preventing further internal corrosion and stopping leaks. The system was designed in Europe to
solve lead pipe issues by creating a barrier between the lead pipe wall and drinking water. It has been
used in France, Australia, Japan, Malaysia, and in North America including Louisville, KY; Calgary, AB;
and Ohio. The liner can span corrosion holes 11A times the diameter of the service pipe. Access at both
ends of the section of pipe to be relined is required for insertion and inflation. The lined pipe is then
reconnected to existing pipes using special fittings (Boyd et al., 2000). The process is quick to install
with typical access requiring only 2 to 3 hours.
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Figure 4-38. Neofit Liner, Before, and After Inflation (www.wavin.com)
4.2.6.3 Deposition ofCalcite Lining. A process for the development of a controlled growth of
limescale was invented by Hasson at the Israel Institute of Technology in 1981 in collaboration with
Mekorot Water to rehabilitate small diameter mains and lead service pipes (Hasson and Karmon, 1984).
The patent rights were assigned to Technion Research and Development Ltd. A hard calcite lining is
deposited on the inside of the pipe from a saturated aqueous solution of calcium carbonate, providing a
barrier to degradation which seals the surface of lead service pipes. The process requires specialized
equipment to circulate the solution through the pipe and the buildup of the layer can take several hours.
There is no evidence of significant commercial use.
4.3 Replacement
Water main replacement is a primary option where renovation of a pipe is necessary. It is frequently used
when a pipe does not have enough structural strength and becomes prone to failure and where precise
condition assessment and residual life estimation may be costly or otherwise difficult to implement. The
two broad categories of water main replacement methods are trenched construction and trenchless
construction.
Trenched construction, which makes up 70 to 75% of water main replacement work, has historically been
the predominant method and traditionally trenches are categorized as narrow or wide trench. For many
utilities, the practice is to install the new mains in a trench parallel to the old main. In some cases,
removal of the old main is not worthwhile or necessary. When AC pipes are replaced, it is usually
considered good practice to leave the old main buried and undisturbed. Since the old main is kept in
service until the new main is in place and ready for connection to the customers' lines, service
interruptions are minimized. In those cases where the old main has to be shut down before the new main
is in place, bypass pipes can be laid to provide uninterrupted service to the customer. A detailed
breakdown of the replacement technologies is shown in Figure 4-39. Sliplining can also be considered a
method of online replacement, but has been covered as a rehabilitation method in Section 4.2.2.
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Impact Moling
Figure 4-39. Summary of Replacement Technologies
4.3.1 Trenched (Open Cut) Replacement. Traditional open cut or trenched replacement can be
categorized into either narrow trench or wide trench construction as described below.
4.3.1.1 Narrow Trench Construction. Narrow trenching or confined trench techniques can
substantially reduce the impacts of the open cut trenching methods. By reducing the trench width, the
amount of excavation and soil disposal, bedding and material importation, pavement restoration, and
construction time to complete the project and associated construction costs can be reduced. The loads on
the installed pipe are related to the trench width for rigid pipes and are reduced by the friction forces
generated between the existing compact soils and the settling installed bedding. Accordingly, a lower
strength pipe may be used with some resultant cost savings. Narrow trench construction requires good
supervision and may call for improved shoring techniques such as trench boxes. Greater care and
supervision in placing the pipe through the trench shoring, jointing in confined working space, and
placing and compacting bedding may be necessary, but the approach can be of considerable benefit in
reducing the disruption normally associated with poorly regulated trenching.
4.3.1.2 Wide Trench Construction. A narrow trench becomes a wide trench when the friction
forces generated at the trench sides are negligible and the settlement of the fill in the trench does not shed
any load to the existing ground at the sides of the trench. In a typical trench, very substantial amounts of
soil, equivalent to 50 to 100 times the volume of the pipe installed, are removed to prepare the foundation
and much of this material is then used for trench fill after the bedding and pipe is placed. Wide trench
conditions can encourage settlement over a wide area and may be damaging to building foundations if
they are within the zone of influence of the ground movements caused by trenching. Substantial costs in
pavement restoration may be incurred in wide trench conditions and higher strengths of pipe may be
required.
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4.3.2 Trenchless Replacement. Confidence is growing in trenchless options and according to
Underground Construction's 14th annual municipal survey, 15.6% of the $2.7 billion spent on new water
main construction and 18.1% of the $1.4 billion spent on water main rehabilitation in 2010 was done
using trenchless methods (Carpenter, 2011). Both figures show an increase in trenchless usage.
Trenchless water main construction methods used for new works and for replacement can be used online,
that is along the alignment of the old pipe, or offline that is taking a new alignment (Iseley and Gokhale,
1997). Principal trenchless options include the following.
4.3.2.1 Pipe Bursting. Pipe bursting is a process that utilizes specialized equipment to fracture
brittle pipe materials and split ductile pipe materials and displace the old pipe into the soil while forming
a cavity in the soil sufficiently large enough to place a new pipe of equivalent or larger size in the space
formerly occupied by the old pipe. Pipe bursting has the advantage that it involves the installation of a
new pipe, often an upsized diameter, and eliminates any need for detailed condition assessment.
However, prior to pipe bursting, a good deal of information about the old pipe and its construction, in
particular the placement and surroundings including the existence of other buried utilities and adjacent
building foundations, is required.
Pipe bursting is easy to install in compressible soil, but rock trenches or reinforced concrete surrounding
the existing pipe preclude its implementation. The alignment must be deep enough to prevent excessive
heave of the ground by the action of bursting or upsizing. Parallel and crossing pipes in the proximity of
the old pipe may be exposed by digging to avoid transfer of the bursting forces and any associated
damage. Removal of service connections is required before bursting to minimize collateral damage. For
this reason, the service connections will often be replaced by trenching or, if lengthy and under the road
pavement, by impact moling. When bursting relatively shallow pipe, the road or driveway pavement may
be stripped back and resurfaced upon reinstatement. Pipe bursting is becoming a popular method of
trenchless replacement of water mains (Deb et al., 1999).
4.3.2.2 Pneumatic Pipe Bursting. The pneumatic pipe bursting method was developed by British
Gas in 1986. It uses compressed air pressure to drive a spring loaded impact hammer behind a bursting
head through the existing pipe, which may be a brittle material such as CI or AC. The bullet shaped
bursting head, as shown in Figure 4-40, is larger than the existing pipe and may have stress raising bars or
blades set into the head to focus the fracture of the existing pipe with each blow from the pneumatic
pressure.
Pneumatic Rpe
Bursting Toot
OtdRpe
BtpanderCcwe
Figure 4-40. Pneumatic Pipe Bursting (www.tttechnologies.com)
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An expanding cone may be placed behind the bursting head to encourage the displacement of the pipe
fragments into the surrounding soil, which creates a cavity large enough to accommodate a new pipe.
This new pipe is usually a continuous length of PE attached to a pulling attachment located behind the
head or expanding cone. PVC pipe should not be used with the pneumatic pipe bursting method.
4.3.2.3 Hydraulic Pipe Bursting. Hydraulic pipe bursting was also developed by British Gas to
provide extra force and displacement during busting. The process initially employed a hydraulic ram and
expander arm mounted in the bursting head to supplement the bursting force and overcome the extra
resistance encountered at joints and repair clamps, as shown in Figure 4-41.
HTC'O
www.perco.co.uk
Figure 4-41. Hydraulic Pipe Bursting Head (courtesy of Perco)
The equipment evolved as an expanding head employing hydraulic cylinders to open the petals of the
head and apply a uniform radial force and extra displacement. The hydraulic power is used to open and
close the bursting head, thus breaking the existing pipe. The bursting head is attached at the front of a
winch chain or cable that passes through the pipe. Once the head opens and breaks the pipe, it is closed
and pulled forward and the process of expansion and forward movement is repeated as the head is pulled
along the line to seat against the next unbroken section of pipe. An HDD rig may also be used to pull the
bursting head through the line. New pipe, usually PE or PVC, is pulled into the formed cavity or jacked
by a hydraulic ram located in the access pipe.
4.3.2.4 Static Pipe Bursting. Static pipe bursting involves pulling a static pipe bursting head through
the line using a winch, chain, or a series of rods as shown in Figure 4-42. Static bursting, using an
automated hydraulic rod puller, provides the opportunity for excellent productivity and efficiency with
minimal risk to workers in the access pit. Typically, rods can be automatically screwed or otherwise
linked together to push a semi-rigid assembly capable of traveling through gradual bends through the line
to the starting pit. The static bursting head, usually an oversize cone shape, is attached to the rod
assembly and drawn back through the line, bursting the old pipe and pulling the new PE or PVC line into
the formed cavity. In the receiving pit, rods can be automatically decoupled and returned to a storage
carousel.
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EXPANDER
HEW
ROLLING
BLADE
CUTTING
QUICKLQCK
BURSTING
RODS
BURSTING SET-UP
Figure 4-42. Static Pipe Bursting (www.tttechnologies.com)
4.3.2.5 Pipe Splitting. For steel or plastic pipe which behave in a ductile manner, a modified
bursting head incorporating cutting wheels or blades is necessary to initiate pipe failure. The blades score
the pipe so that it readily splits as the head is pulled through it. The split pipe is opened up using an
oversize expander and the new PE or PVC main is pulled into place.
4.3.2.6 Pipe Reaming. An HDD machine can be used to rotate and pull a specially designed reaming
head through an AC or plastic pipe, breaking the pipe into fragments and displacing the fragments in
bentonite slurry while pulling in a replacement PE or PVC pipe.
4.3.2.7 Pipe Pulling. A variety of pipe pulling techniques are described in Lead Pipe Rehabilitation
and Replacement Techniques (Kirmeyer et al., 2000). The basic pipe pulling method consists of passing a
cable through the existing pipe, locking the cable, attaching the replacement pipe, and simultaneously
pulling out the cable and old pipe with a winch. These include the Superior Bullet technique, developed
in the U.S., which consists of a cone shaped tool attached to a cable passed through the lead pipe. The
replacement pipe is pulled into the space previously occupied by the lead pipe.
The SADE™ pipe pulling system involves pulling a cable fitted with a series of shaped cones fixed along
the cable. As the cable is tensioned, the cones lock into the lead pipe allowing the pipe to be pulled from
the ground (Boyd et al., 2000). Problems can occur due to buckling, crushing, or rupture of the lead pipe
and the failure to remove the pipe due to compacted ground.
Perhaps the best known pipe pulling method is the Hydros™ system developed in Berlin by Karl Weiss
for pulling CI and AC water mains. Line lengths of up to 300 feet can be replaced with a continuous PE
or PVC pipe. There are a range of variants on the pulling theme: Hydros™ Boy for small diameters up to
2 in.; Hydros™ Lead for lead service pipes; and Hydros™ Plus for water and gas pipes up to 15 in. in
diameter. The Hydros-Lead system, Figure 4-43, uses a different method to transfer the pulling force
from the cable to the lead pipe.
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Figure 4-43. Hydros™ Plus (courtesy of Karl Weiss Technologies)
The technology utilizes an inflatable hose in addition to the steel cable. Both hose and cable are pulled
into the lead pipe where the hose is inflated to grip the inside wall of the lead pipe. The replacement PE
pipe is attached to the service end of the lead pipe via an adapter. The inflated hose plus the cable and
lead pipe are pulled out of the ground by a winch situated above the excavation, while simultaneously
pulling the new pipe into place.
4.3.2.8 Microtunneling and Pipe Jacking. This pipe installation method involves pushing the new
pipe horizontally through the ground with an arrangement of remotely controlled hydraulic jacks while
excavating the soil ahead of the pipe with a rotating cutting head. Developed largely in Japan in the
1970s, the technique can be used to install pipelines from 8 in. up to 10 ft (200 mm to 3 m) or more in
diameter. Microtunneling systems have been used to install pipes in a single pass operation in lengths
typically from 200 to 1,500 ft. Microtunneling systems are usually categorized according to the method
of soil removal as auger, slurry, or earth pressure balance (EPB) machines shown in Figure 4-44.
Figure 4-44. EPB Machine (www.midwestmole.com)
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Considerable planning and geotechnical survey work are required for a microtunneling project to
determine the location of starting and receiving shafts, pipeline alignment, and selection of machinery.
Microtunneling can be undertaken in a wide range of soils and groundwater conditions. It is an expensive
and relatively slow form of construction which may be justified for water mains construction in crowded
urban surroundings and for river, road, and rail crossings.
For short and shallow buried crossings and dry conditions in stable soils, pipe jacking, which includes the
methods shown in Figure 4-45, can also be used. In this option, a pipe fitted with a cutting shield is
jacked from a prepared starting shaft by pushing the pipe with an array of hydraulic cylinders against a
thrust wall while workers at the face hand dig the soil and transport the spoil to the surface.
Figure 4-45. Summary of Pipe Jacking Technologies
The selection of the right jacking pipe is paramount. Typically, the loads imposed on the jacking pipe
during installation are going to control the pipe design. Jacking loads of up to 1,000 tons are possible, so
the jacking pipe needs to have high axial compressive strength and stiffness. "In wall" joints are used to
avoid projections beyond the OD of the shield and to minimize friction between the pipe wall and the soil.
Bentonite slurry is usually introduced between the pipe barrel and the soil to minimize friction, but
smooth, non-porous pipe surfaces are also beneficial. The intermediate jacking stations (US) used on
long drives are operated in sequence so that only sections of the jacking pipe are slid through the ground
at any one time. This minimizes the jacking force needed to drive the tunneling machine and pipe column
forward. Typical pipes that have been used for jacking of pressure pipes are GRP, polymer concrete,
reinforced concrete, steel, and DI. PVC can also be jacked, but requires a large number of US, making it
somewhat uneconomical.
4.3.2.9 Pipe Ramming. Pipe ramming utilizes an impact hammer fixed on rails at the start point to
drive an open-ended steel pipe fitted with a cutting shoe through the ground, as shown in Figure 4-46. It
can be used to place steel casing pipe from 4 to 144 in. in diameter. The casing pipes are equipped with
bentonite lubrication by welding !/> inch pipe on the outer surface. The soil can be left inside the pipe
until the drive is complete or partial soil removal can be undertaken to reduce friction loads during
ramming. Various methods, including compressed air, can be used to remove the soil from the interior of
the pipe. Excess soil also can be displaced from inside of the casing through vents in the hammer adaptor
piece. Ramming is a non-steerable method for pipe installation, which is normally used for short
installation, typically 150 feet, but up to 300 feet under roads or railway embankments where settlement is
not permissible. It is used for construction of pipelines in clay, silt, and sandy soils, and quite large
boulders and gravel can be accommodated. The installed casing may be filled with carrier pipe or cable.
Ramming can also be combined with an initial steerable pilot bore to provide accurate crossing
alignments. It is generally a very safe method of construction in regards to ground settlement, but loose
existing soils that may be compacted by vibration should be carefully evaluated.
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Figure 4-46. Pipe Ramming Under a Railroad (www.midwestmole.com)
4.3.2.10 Impact Moling. Impact moles are also known as earth piercing tools, soil displacement
hammers, impact hammers, percussive moles, and pneumatic moles. Impact moling is a process whereby
the pneumatic impact tool drives itself through the ground, unguided, to form a new hole in the ground
into which a new pipe (usually PE or PVC) is pushed or pulled, as shown in Figure 4-47. This method is
used for short lengths and small diameters (i.e., drives of pipe up to 10 in. in diameter, less than 200 feet
long). Different heads are available for different soil types. Moles are typically launched from a pit using
a launching cradle. The long body of the mole helps to keep the drive reasonably straight, though the
drive path will follow the line of least resistance through the soil. Hand held monitoring equipment can
determine the path of the mole by tracking the signal emitted from a sonde in the mole head. Moles that
provide for a steering capability have been developed, but none yet have proved reliable enough for
regular commercial practice.
Figure 4-47. Impact Moling Tool (www.tttechnologies.com)
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4.3.2.11 Horizontal Directional Drilling. HDD rigs, as shown in Figure 4-48, are used to install
pipelines crossing roads, railroads, rivers, and other obstacles. The HDD process has experienced
significant usage since its development in 1970 and has become a commonplace method of installation.
HDD is ideal for the installation of several replacement pipe materials, such as HOPE, PVC, and steel
pipe. HDD is generally performed in a three-step process: pilot hole drilling; pilot hole reaming and
drilling mud injection; and pipe pull-back. The drilled hole is typically 30 to 50% larger than the pipe to
be installed and the hole is stabilized with bentonite while the excavated material is flushed out with the
drilling fluid.
Figure 4-48. HDD Rig (www.tttechnologies.com)
The pilot hole establishes the path of the installed pipe. Typically, the path of the drill head is tracked
electronically using a sonde located in the drill head and either a hand held detector above ground
(walkover system) or a path tracking system based on the use of natural or artificial electromagnetic fields
and wired back to the drilling machine (wireline system). Design considerations include soil
characteristics, radius of curvature of the bore path, and its effect on the pipe to be installed, particularly
the pull-back force. A detailed geotechnical survey is required to determine the suitability of the chosen
alignment. The HDD drill path can be steered around known obstacles provided the locations are
identified in time for gentle deviation. Mini-HDD rigs can handle pipes up to 12 in. in diameter and are
used primarily for utility construction in urban areas. Large (maxi) HDD rigs are capable of handling
pipes as large as 54 in. in diameter and, under reasonable ground conditions, can install moderate
diameter pipelines (e.g., 18 to 24 in.) over lengths of 1 mile or more. The length of the bore, diameter of
the replacement pipe, and geotechnical properties of the soil determine the size of the drill rig required.
Gravel soils are not recommended, as it can be difficult to sustain an open borehole prior to the pipe pull.
Mud motors are used for drilling through rock and stiffer soils.
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5.0: SERVICE LINES
5.1
Characteristics of Service Lines
Estimates of the length of water distribution piping in the U.S., which range up to 1.8 million miles, do
not include the more than 65 million estimated service lines in use in the U.S. (EPA, 2007b). Kirmeyer et
al. (1994) estimated that there are more than 880,000 miles of service lines in the U.S.
According to Economic and Engineering Services (EES) and Kennedy/Jenks/Chilton (1989), the types of
pipe in common use vary widely. The service line typically has a diameter of % to 2 in. Most service
lines are made of copper, PE, galvanized steel (GS), and PVC. Other materials remaining in use include
lead and polybutylene (PB) and brass. Lead service lines still exist in some older systems and studies
estimate the number of lead services to be around 3.3% of all services, which is close to 2.3 million
service connections (EPA, 2007b). If not removed or lined, lead service lines are potentially a source of
lead entering customers' drinking water.
5.1.1 Service Line Materials. AWWA's Water Stats 2002 Distribution Survey collected data on
the water distribution systems, including customer service lines, from 337 water utilities located in the
U.S. and Canada (AWWA, 2004a). A breakdown of the types of service line materials and the estimated
installed percentage of each material is shown in Table 5-1.
Table 5-1. Types of Service Line Materials
Service Line Material
Copper
Polyethylene
Galvanized Steel
PVC
Lead
Polybutylene
Steel
Cast Iron
Asbestos Cement
Other
Percent of Total
60.5
12.4
8.6
6.3
3.6
2.6
1.7
1.3
0.4
2.2
5.1.1.1 Copper. Copper is popular for its longevity and biostatic characteristics. Copper tube, shown
in Figure 5-1, used for water service and distribution piping is manufactured to ASTM B-88 Standard
specification for seamless copper water tube (ASTM, 2009c). ASTM B-88 tube is available in three
grades (i.e., K, L, and M) with type K being the heaviest walled followed by Type L and Type M,
respectively. Types K and L are available in both annealed (soft) temper and drawn (hard) temper, while
Type M is only available in drawn (hard) temper. Types K and L are the most common copper service
lines used in distribution systems today.
The life expectancy of copper service lines varies depending on soil conditions, acidity of water, stray
currents, and type of disinfectant used at the treatment plant. On average, copper has shown a life
normally in excess of 75 years. Also, U.S. copper tube manufacturers provide a limited warranty of 50
years, depending on the specific situation (NSF, 2005). Copper tubing (Types K, L, and M) is
commercially available in 20-foot rigid lengths or coiled. This material also has high water-flow
efficiency, since there are generally no fittings in water services. Copper is easy to bend with proper
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mechanical bending tools. Copper service lines can be joined by soldering, brazing, compression, or flare
connections depending on utility practices and specifications. Local codes should be followed (e.g.,
solder joints are unacceptable in many municipalities and areas for underground installation of copper
tubing). Copper has a low friction coefficient, therefore smaller diameter services can be installed than
with other materials with higher friction coefficients, which would require larger diameters to achieve
equivalent flows. Copper piping can be readily detected underground with the use of ground penetrating
radar, sonic evaluation, and/or using an electromagnetic emission pulse device.
Figure 5-1. Copper Piping
5.1.1.2 Polyethylene. PE service lines are characterized by their toughness, excellent chemical
resistance, low coefficient of friction, and ease of processing. PE service lines offer many advantages
including high ductility, corrosion resistance, flexibility, light weight, and reduced installation costs as
well as excellent long-term performance as pressure pipes. According to PPI, the life expectancy of PE
pipes is more than 50 years. PE was first used for water service line applications in the early 1950s, and
since that time both the material standards and materials have evolved. PE does not need cathodic
protection and it is also resistant to aggressive soils and the bacteria and fungi found in them. It also has
good resistance to some organic substances, such as solvents and fuels (PPI, 2007). Additionally, PE
service lines have proven to have high tolerance to handling and bending in cold weather.
Joints in PE piping are not made with adhesives or solvent cements, but with mechanical fittings or with
stainless steel band clamps. Service line segments can be heat-fused, which requires skilled labor and
special tools for proper installation. The most common problem with PE pipes and other plastic service
pipes is kinking from improper installation and the difficulty of locating PE lines when they are buried
(Thompson et al., 1992). Many utility lines require a tracer wire to be installed above the service line so
it can be located by magnetic pulse. PE service lines are installed as per AWWA C901 (AWWA, 2008).
5.1.1.3 Galvanized Steel. Usually found in older homes, GS service lines are covered with a
protective coating of zinc to extend the pipe life expectancy about 40 years, but the coating generally fails
and they corrode inside and out depending on soil conditions, temperature, and acidity of water being
transported. Some issues with GS service lines, which are commonly sold in rigid lengths of 22 ft,
include having lower water flow efficiency than copper because of the required number of fittings which
may increase head loss. Also, GS service saddles were found to corrode within 5 to 25 years depending
on local soil conditions and external effects of the environment.
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Other issues include cutting GS, which is more difficult to cut than copper or plastic. Once cut, the
service line has to be threaded and a small amount of pipe joint compound must be applied on the thread
for the screw-on connections needed for fittings. GS service lines have a history of corroding in alkaline
water more than any other piping metal (Grigg, 2004). According to NSF (2005), minerals in water can
react with galvanizing material and form scale, which builds up over time and will eventually clog the
service line. Also, iron oxide can build up over time, especially in small diameter pipes, causing the
water to become rust colored when the tap is first turned on. Eventually the service line will corrode
completely through the pipe wall, usually at the joints first, resulting in leaks. If a leak occurs, corrosion
products can be used to form a coating over the leak and temporarily sealing it.
Another problem associated with GS service lines is the galvanic corrosion effect of joining brass valves
and steel piping shown in Figure 5-2. Whenever the steel pipe meets copper or brass, a rapid corrosion of
the steel service line will occur due to electric charge flowing from one material to the other, which
accelerates deterioration. Dielectric unions can be used between copper and steel pipes to prevent the
flow of electric charge. GS service lines are mostly recommended in locations where the line may be
subject to impacts although the issues mentioned above would still be factors.
Figure 5-2. Corrosion Failure of Galvanized Steel Pipe Coupling
5.1.1.4 Polyvinyl Chloride. PVC service lines are readily available, economical, and corrosion
resistant and have been predicted to have a life expectancy of a hundred years or more (Burn et al., 2005).
Since PVC, like other plastics, is not subject to corrosion, the surface remains smooth, eliminating
tuberculation that can reduce hydraulic capacity and increase pumping costs. The smooth internal wall
surface of PVC service lines minimizes fluid friction and flow resistance, thereby providing high flow
efficiency similar to copper and other plastic service lines. PVC service lines for most water distribution
applications are designed with deep insertion joints engineered not to leak. Because gasketed, push-
together PVC pipe joints are relatively easy to assemble, they can be tested and placed in service quickly.
5.1.1.5 Lead. The revisions of the SDWA in 1996 resulted in reduction of allowable leaching levels
for materials that come into contact with potable water supplies (15 ug/L for lead and 1.3 mg/L for
copper). Many utilities, especially older municipalities, are faced with lead material in their water
distribution systems. Lead service piping has not been used by most U.S. cities since the 1940s and lead
has been banned for use in plumbing systems since 1986 (Kirmeyer et al., 2000). Depending on site
specific connection details, lead service lines have a life expectancy of 60 to 75 years. However, because
of potential health risks associated with excessive lead levels in water, lead has been replaced in new
installation by alternatives such as copper and PE.
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Utilities may be driven to implement a lead service line replacement program that can require enormous
field work to identify lead service lines service by service. Lead line replacement can be either conducted
as a stand-alone project or in combination with main rehabilitation projects. However, partial
replacement of lead service lines usually entails disturbance of lead scales, lead burrs where the service
line is cut, and galvanic corrosion when the remaining lead service line (i.e., customer owned) is coupled
to a copper service line. It is important to note that when the lead service lines are removed, a high lead
content can be observed immediately afterwards, even when the entire lead service line has been
removed. This is due to lead particles being dislodged during shut-off and subsequent pressurization of
the service line. It is recommended that new lines be flushed for about 60 minutes following the
completion of all renewals. Changes in secondary disinfectant and water quality may also result in lead
leaching. Kirmeyer et al. (2000) discuss lead pipe services in more detail and WaterRF has funded a
project to evaluate lead service lining technologies (WaterRF, 201 la).
5.1.5.6 Polybutylene. PB pipe was a popular material in the 1970s through the early 1990s. PB
service lines come in rolls of flexible plastic and require special fittings that are neither soldered nor
cemented but mechanical. This material is relatively easy to cut with a saw or a knife and need not be
threaded. Although PB is corrosion-proof, it has a widespread record of failure possibly owing to its
reaction to chlorinated water. PB has a lower material cost than copper and lower installed cost as well,
because the skills required for installation and the lightness of the material result in reduced installation
time. The useful life of PB service lines is significantly shorter (in some cases, less than 16 years). Many
plumbers may have used improper fittings to join the service lines and it is possible that use of semi-
skilled laborers has led to improper pipe joint installation, mostly by over-tightening the fitting clamps.
However, the current theory is that residual disinfectants in the public water supply react with PB and the
acetal resin in the fittings and thus weakens the service lines and joints. The PB industry is currently
developing a stronger product that will address the past common problems associated with PB installation
and operation to match, or exceed, the performance of other available piping materials.
5.7.5.7 Other Service Line Materials. Tri-layer service lines such as PE-aluminum-PE (PAP)
composite pipes combine the characteristics of both materials to form a service line that is light, strong,
and resists corrosion. By combining the two materials, it is claimed by some manufacturers that tri-layer
pipes avoid the thermal expansion and deformation of plastic service lines (IPEX, 2009) while retaining
the flexibility, frost resistance, and ease of use associated with plastic. PAP pipes are not recommended
at continuous service temperatures above 104°F. Like most plastic service lines, this product requires few
fittings and joints, making for faster installation than metal service lines. Unlike most plastic tubing, tri-
layer pipes permanently hold their shape and do not need additional clips or brackets to retain their shape
in bends or curves. Similar to plain PE pipes, PAP pipes have a smooth inner wall and a design life span
in excess of 50 years (IPEX, 2009). Municipal experience with this relatively new product is very
limited.
Fiberglass pipes are known for their application in corrosive environments. The smooth internal wall
minimizes fluid friction and flow resistance, similar to copper and plastic service lines. Use of fiberglass
piping in service lines is rare because standard products start at 1 in. in diameter.
5.1.2 Ownership and Legal Issues. The information provided in this section is intended for
information only and is not intended as legal advice. Service connections are generally comprised of two
parts:
• Service line from the main to the edge of the street or easement right-of-way
• Customer line from the right-of-way or street into the customer premises
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In general, the service line is owned by the water utility and the customer line by the property owner,
though some locations place ownership of the service line in the right-of-way on the customer.
Responsibility for maintenance rests with the owner of each portion of the connection. There are several
possible points of change of ownership including: the main itself; the property boundary; the meter; the
curb box; or the building itself.
Municipal codes will define the point of change of ownership. In most cases, but not all, the utility aims
to place the meter and/or curb box at the property boundary and to have change of ownership at this point.
Meters themselves remain the property of the utility irrespective of their location, including inside
buildings.
In some communities, the utility or municipality maintains the whole of the service connection. In most
communities, however, the property owner is responsible for maintenance of the service connection, in
particular the customer line. There has been a tendency among communities to avoid programs that
require work on private property or may create future liability from activity on the private portion of the
service connection. However, any rehabilitation program that includes the services will inevitably require
such work.
5.1.2.1 Property Access Issues. Many communities remain unsure of the legal authority to test,
maintain, and rehabilitate service connections. To address these issues, policies related to public health
for work on service connections, work related to inspection, and to enforcement of municipal codes need
to be clarified so that service connections remain in good working condition and do not represent a public
health hazard. For example, there is large variation in municipal codes concerning backwash prevention
devices.
Access to private property for such purposes constitutes exercise of the police power of local authorities.
Legal and constitutional issues involving private rights must be considered, in terms of both right of
access to private property and of potential liability for personal injury or property damage arising from
works undertaken on private property. There are also restrictions on the use of public funds for private
property improvement.
If a public authority wishes to gain access to private property, the most common approach is to use right
of entry permit forms signed by each individual property owner. However, any regulations to permit
inspection of private property must take into account the Fourth Amendment provisions concerning
unreasonable search and seizure or restrict activities to within established easements except in cases of
emergency.
The U.S. Supreme Court determined in 1967 that regulatory agencies must obtain a warrant prior to
conducting an administrative search. Administrative search warrants can be used to permit a large
number of inspections within problem areas without the need to obtain permission from each property
owner in advance, or where owners deny voluntary access, for example through refusal to sign a right of
entry permit form. In emergency situations, an emergency exemption exists, where access may be gained
without a warrant, for example to protect public health or safety.
5.1.2.2 Funding Issues. Most states have constitutional provisions that limit the use of public funds
to expenditure for public purposes (i.e., the public purpose doctrine). State laws vary considerably and
should be reviewed with care before implementing specific programs. It is generally accepted that private
owners may derive some benefit from public funds provided that it is incidental to the benefit accruing to
the public at large through public health, safety, and the environment. Such programs generally fall under
municipal legislation or policy, so local government determines whether that is the case. Very few
projects for public benefit are without elements of personal benefit to certain individuals so there is not a
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fixed definition. Local government officials make determinations based on the merits of each case and
generally have broad discretion to do so.
There may be an impact on existing private property rights from the adoption of new regulations. Both
the Fifth and Fourteenth Amendments impact this. A regulation that has a clear and rational relationship
to preventing or reducing a threat to the public health and environment would generally be considered to
meet the requirements of these amendments irrespective of their effect on private property rights.
Experience from some utilities has shown that legal issues associated with the inspection, rehabilitation,
and repair of service connections on private property and privately-owned can be managed, provided that
there is clear benefit to the public at large and the political will exists to do so.
5.2
Renewal of Service Lines
Service line rehabilitation technologies were discussed in Section 3.2.6. A summary of the technologies
available for the rehabilitation or replacement of water service lines is presented in Table 5-2. Each
technology is capable of rehabilitating or replacing lead service lines, and other pipe materials, thereby
improving water quality when necessary.
Table 5-2. Summary of Renewal Technologies for Service Lines
Category
Rehabilitation
Rehabilitation
Rehabilitation
Replacement
Replacement
Replacement
Type
Close-Fit Lining
Epoxy Coating
Calcite Lining
Impact Moling
Pipe Bursting
Pipe Pulling
Brand Name
Neofit Process
Nu-Flow Epoxy
N/A
Various
Various
Hydros™ Boy
Vendor
Wavin/Flow-Liner
Nu-Flow Technology
Israel Institute of Technology
Various
Various
Hydros™
Diameter, in.
0.5-1.5
0.5 - 10
N/A
1.75-7
0.5-2
0.5-2
5.3
Reconnection of Service Lines
For most of the pipeline rehabilitation techniques, there are three basic issues that must be overcome in
order to reconnect a service without excavating. These challenges include: finding the service connection
post-rehabilitation; re-establishing the opening; and connecting the service to the liner or carrier pipe.
5.3.1 Finding the Service Connection. To accomplish reconnections without excavation at the
service location, work from within the pipeline will likely be required. The insertion of a pipe or liner
within the old main generally obscures the position of each service line. In the wastewater industry,
where laterals are larger, a dimple is often visible in the liner, indicating that a lateral is present. In water
mains, the service lines are generally smaller and more difficult to see and the liners have stiff reinforced
fabrics that limit deflections at openings. The techniques that have been proposed for finding services
include:
• Homing in on a radio frequency signal transmitted on the service line
• Homing in on a transmitter or magnet inserted within the service line
• Using remote-field eddy current technology to detect the corporation stop and tap
• Precisely mapping the service line location prior to lining
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5.3.2 Re-establishing the Opening. Most concepts for re-establishing service lines involve a
pipeline robot that drills a hole through the liner or carrier pipe. Similar devices are used routinely in the
wastewater field for this exact function. Re-establishing the opening should not be difficult if its location
is known with precision, but precision is the key. Since the average water service line is small, a liner
hole that is off the mark by a fraction of an inch may be useless and particularly poorly made holes might
interfere with the reconnection process. Another approach to re-establish the opening would be to drill
from the outside in. For example, a drill-bit attached to a plumbing snake or small boring device that is
deposited in the corporation stop prior to lining, and later signalled to bore its way back to the main.
Such outside in technologies are concepts and/or prototypes at present and there is no evidence of their
commercial use in the field to date.
5.3.3 Connecting the Service Line to the Liner or Carrier Pipe. Achieving a positive connection
between a service line and the liner pipe is the issue that most profoundly separates water system
conditions from wastewater system conditions. In the case of water mains, pipelines are pressurized, and
leakage to the annulus at service connections and liner terminations must be prevented. Where a tight-
fitting liner or a well-adhered spray-on liner is used, the sealing may not be a significant issue. Grouts,
sealants, and adhesives of various types may be capable of preventing this leakage. The problem
becomes more difficult if a loose liner is used or if a material such as HDPE pipe is used, which is
resistant to most chemical and mechanical bonding methods. In such cases, a small connecting piece that
is inserted into the corporation stop and fused or mechanically connected to the liner pipe may be needed.
One of the difficulties in making the connection between the liner and service line is dealing with the
numerous variations in conditions that will be encountered within existing water systems including:
difference in pipeline materials; scaling and other surface conditions; uncertainties regarding structural
integrity of old mains; and differences in diameter and dimensions.
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6.0: TECHNOLOGY SELECTION CONSIDERATIONS
For water main renewal, the challenges fall into two categories: assessing the condition of existing pipes
(e.g., defining the problem) and selecting the appropriate technique to restore the pipe condition to a
desired level (e.g., solving the problem). For the water main requiring renewal, the problem to be
addressed needs to be well defined and understood such as the performance and condition of the asset and
the cause of its deterioration. Once the problem is defined, different solutions can be developed based
upon a review of available technologies that can address the current asset condition and extend the
remaining asset life. Next, an appropriate rehabilitation solution should be selected based upon
consideration of several factors including technology costs (both capital and life-cycle), maintenance
requirements, bypass piping requirements, disinfection requirements, NSF/ANSI 61 requirements,
accessibility, and criticality of the water main. Decision support systems have been developed to assist
decision-makers with selecting water main rehabilitation technologies including Deb et al. (2002) as
shown in Figure 6-1, Matthews (2010), and Ammar et al. (2010).
Selected Pipe
Replace with larger pipe
Add an additional parallel pipe
Structural liner
Replace pipe
Structural liner
Replace pipe
Cathodlc protection
Replace with larger pipe
Add an additional parallel pipe
Ncm or Semi-Structural liner
Structural liner
Replace pipe
Semi-Structural liner
Structural liner
Replace pipe
Non or Semi-Structural liner
Structural liner
Replace pipe
Reevaluate pipe
No action necessary
Figure 6-1. Technology Selection for Water Main Rehabilitation (Adapted from Deb et al., 2002)
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6.1 Defining the Problem
Once the pipe to be renewed has been identified, the various problems or performance issues associated
with the pipe are evaluated to determine the types of renewal options available. The AWWA M28
Manual, Water Main Rehabilitation, describes a number of possible solutions to problems ranging from
corrosion to deposition, as described in the sub-sections below (AWWA, 200Ib). These solutions range
from simple periodic cleaning to replacement of the pipe using trenchless techniques. All of the solutions
discussed in the manual make some use of the existing pipe, either as part of the rehabilitated system
(renovation solutions) or as a convenient route for the installation of a new piping (replacement
solutions). According to the AWWA M28 Manual, the categories of issues that should be evaluated
include: structural, hydraulic capacity, external corrosion, joint leaks, and water quality.
6.1.1 Structural Problem. Any structural problems in the host pipe must be well defined in order
to select and design an appropriate rehabilitation technology. The AWWA M28 Manual has established
four classes of design: non-structural (Class I), semi-structural (Classes II and III), and fully-structural
(Class IV). Class I liners only act as corrosion barriers. Lining systems that span holes and gaps in the
host pipe, but require support from the host pipe to prevent collapse are considered semi-structural Class
II liners. Semi-structural Class III liners also span holes, but they have sufficient thickness to resist
bucking from external hydrostatic load or vacuum load. Class IV liners will carry the full internal
pressure without support from the host pipe.
Condition assessment may be used to determine the degree of deterioration of the host pipe and if it is
partially deteriorated (suitable for semi-structural Class II and III solutions) or fully deteriorated (suitable
only for a Class IV structural solution). Therefore, the assessment of the condition of the water main and
how it compares to the "as new" pipe condition plays an important role when selecting technologies for
renewal. Inspection is also done after rehabilitation of the pipe has been carried out as part of the
rehabilitation QC process.
A brief description of the available water main inspection technologies is provided in Table 6-1. More
detailed information can be found in Condition Assessment Technologies for Water Transmission and
Distribution Systems (EPA, 201 la) and Lillie et al. (2004). Effective inspection and condition assessment
of water mains is generally difficult and may be extremely costly to carry out. Cost effective inspection
methods to be used both before and after rehabilitation are a high priority research need in order to fill
data gaps and improve the success of water main renewal efforts.
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Table 6-1. Water Main Inspection Methods and Methodologies
Technology
Visual Inspection
and Sounding
Leak Noise
Correlators
Acoustic Leak
Detection
Acoustic Emission
Monitoring
Ultrasonic
Inspection
Seismic
Pulse Echo
Remote Field
Technology
Near Field
(Broadband
Electromagnetic)
Electromagnetic
Magnetic Flux
Leakage (MFL)
Laser Profiling
Tracer Gas
Injection
Comments
Used to assess the condition of liners and in PCCP to locate distress (potential wire
breaks, etc.). Generally used for larger diameter man-entry pipes and visual inspection
with CCTV used on small diameters.
Leak detection from the surface using pipe features, but it fails to determine the leak
type (i.e., joint or barrel). Generally not effective on large diameter pipes.
Sometimes limited due to pipeline geometry and presence of valves and fittings. Online
that requires only a small diameter access point of 2 to 4 in.
Inserted under pressure to monitor PCCP for wire breaks. Fiber optic cable used for
long-term monitoring or accelerometers for short-term.
Non-intrusive technique if applied from the exterior. Can detect the loss of wall due to
erosion or corrosion but will not be very successful in pipes with heavy tuberculation.
Also not reliable with cast iron pipe.
Technique requires dewatering and man-entry. Technique is not available for diameters
below 54 in. and is essentially used for online monitoring.
Requires limited cleaning prior to inspection. Remote field pigs can be inserted into live
water mains, 4 to 12 in. Measures average wall thickness over an area.
If internal, requires limited cleaning and dewatering. Measures average wall thickness
over an area (1 to 2 in. square) and evidence of graphitization. Hand scanning tool used
externally without interruption of service.
Man-entry for 36 in. and above, robotics used for smaller diameters down to 24 in.
Used to detect wire breaks in PCCP.
Mainly used where pipe is exposed or by digging pits. Requires cleaning of pipe
exterior. Measures remaining wall. Oil and gas industry use MFL intelligent pigs to
survey long transmission lines. This is not practical with water mains.
Laser light projected on pipe wall and used to measure internal diameter around
circumference. Locate areas of loss of inner wall on mortar lined pipes. Good for
proper sizing of liners. 2D and 3D profilers available.
Tracking gas under roads and pavement surfaces becomes tough to analyze. Relatively
low cost for leak detection.
6.1.2 Hydraulic Capacity. The availability of capacity and need for additional capacity can affect
the selection of renewal technologies for water mains. If the existing pipe's capacity is insufficient, then
the need for a larger size pipe will further limit the renewal options. The flow capacities of the original
and renewed pipe can be estimated by the Hazen-Williams formula. Typically, new renewal liners are
going to improve the flow properties such that a slight reduction in diameter is offset by the higher C-
factor. If the pipe's capacity is adequate, trenchless replacement using sliplining or a structural liner are
recommended options. These rehabilitation options will also rectify any previous joint leak or water
quality problems.
One contributing factor to reduced hydraulic capacity is the buildup of debris and tuberculation inside the
distribution system piping. The Hazen-Williams C-factor, and hence the flow in a pipeline, depends on
the smoothness of the interior surface of the pipe. For a given velocity, increased internal surface
roughness can lead to a reduction in overall pipeline efficiency. Field testing techniques allow
distribution system operators to calculate Hazen-Williams C-factors for their systems. These data help in
making informed decisions about which process to employ to restore hydraulic efficiency. Collecting
data for the Hazen-Williams C-factor before and after employing any cleaning or pipe rehabilitation
process is also a very useful way to gauge the impact of the system improvements.
The capacity of a pipe can be significantly reduced after it has been rehabilitated using some methods.
Certain structural rehabilitation techniques have thicknesses larger than 1 in., which can reduce capacity.
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There may be improvement in hydraulic performance due to the lower friction of the new surface, but in
some cases the operating pressure of the pipe has to be increased. Also, as pipes reach the end of their
service life; hydraulic modeling of the system can help to determine if additional capacity will be needed.
An interactive liner that does not leave an annulus between the liner and the host pipe reduces the
potential for capacity reduction. Sliplining, which has an annulus, results in a greater loss of cross-
sectional area although again the friction coefficient will typically be decreased. Close-fit liners result in
moderate reductions in capacity and typically increase the Hazen-Williams C-factor to 145 or more (EPA,
201 Ob). The utility must determine what type of capacity loss is allowable.
Surface friction is very important for water mains as compared to gravity sewers since the smoothness of
the surface becomes important to facilitate hydraulic flow. Many technologies, such as woven hose
liners, provide a smooth coating that comes in direct contact with water. Lining pipes with polymers or
cement mortar does two things: (1) it avoids metallic pipe material from coming in direct contact with
water; and (2) it facilitates smooth hydraulic flow. It is typically recommended that lining the internal
surface of mains, service lines, and plumbing with approved material be regularly done to avoid loss in
hydraulic capacity.
A cost trade-off becomes a key in deciding whether pipe diameter has to be increased to improve
hydraulic capacity. In these instances, a utility might opt for replacing the existing main even if
rehabilitation measures can be achieved. Online replacement techniques such as pipe bursting or
microtunneling could be used, thereby reducing the impact on pavements, the environment, and regular
traffic (AWWA, 200Ib).
6.1.3 External Corrosion. If external corrosion is the cause of the buried pipe deterioration, and
there are no water quality problems and adequate capacity is available, then the addition of cathodic
protection would be recommended if the remaining strength of the pipe is adequate for the working
pressure, surge pressure, and external loads. If a considerable amount of the pipe wall has already
graphitized, then cathodic protection may not be a good long-term investment. A proper condition
assessment and understanding of the pipe's remaining strength should be done before embarking on
cathodic protection as a solution to structural problems (AWWA, 200Ib).
6.1.4 Joint Leaks. Over time with pipe movement and aging of elastomeric gaskets, joints may
start to leak, resulting in loss of water and diminished pipe support due to eroded bedding materials.
Liners can prevent these leaks by spanning gaps in joints. For joint leaks, a semi-structural liner capable
of bridging joint gaps would be a solution worth considering. Other solutions include mechanical joint
repair systems (AWWA, 200Ib).
6.1.5 Water Quality. The quality of drinking water varies considerably, both from system to
system and within a system, as a result of deterioration after water leaves the treatment plant and comes
into contact with the interior of distribution system piping. Over time, changes in the water chemistry can
cause problems throughout the distribution system, ultimately affecting the quality of water delivered to
the end user. Water quality problems can primarily be addressed by cleaning and lining. The type of
water conveyed might impact the decision to use either a cement mortar lining or a polymeric lining. The
specific nature of distribution system water quality problems varies with water chemistry. However, the
majority of problems fall into three categories: sedimentation, encrustation, and fouling (AWWA, 2001b).
6.1.5.1 Sedimentation. Sedimentation is the process whereby solids settle out of water moving at
low velocity in a main, reducing interior cross section and capacity. Source water pipelines or pipelines
carrying improperly treated water can be subject to deposits of sand, silt, or organic materials. In extreme
cases, sedimentation can also contribute to hydraulic problems, particularly at low points in the pipe.
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Even slight overtreatment of water can result in post-treatment precipitation within the distribution system
of deposits containing alum, lime, or calcium carbonate. A utility may promote controlled precipitation to
lay down a thin layer (eggshell coating) of calcium carbonate on the metallic pipeline interior. However,
excessive or irregular deposits can easily occur, requiring cleaning of the distribution pipe (AWWA,
2001b).
6.1.5.2 Encrustation. Encrustation is a byproduct of corrosion (tubercules) mixed with mineral
deposits such as iron, manganese, and carbonates. Before the 1960s, many iron pipes were installed
without linings to protect the interior surfaces. These unlined pipes experience internal corrosion. As
corrosion occurs, the interior of the pipe develops pits from which material is removed and tubercules
where material is deposited. Additionally, corrosion can create red water complaints from end users.
Corrosion can result from direct oxidation or electrolytic action, but fostered by aggressive water.
Tuberculation may vary with water chemistry from very soft to very hard water. Encrustation can be
removed by cleaning. Such removal of encrustations often increases a system's disinfectant residual. If
the encrustation is removed and the pipe not lined with a corrosion barrier, the encrustation will return
(AWWA, 200Ib).
6.1.5.3 Fouling. Fouling represents a very significant problem, but one that is not always well
understood. A fouling problem can develop with any type of pipe material. The condition is usually due
to naturally occurring biological activity and results in buildup of an organic deposit on the interior of the
pipe. Although this deposit is often soft and filamentous, it can severely affect water turbidity and cause
taste and odor problems. Bacteriological activity from organisms, such as iron-fixing bacteria, can result
in development of slimes and severe deposits in the pipe (AWWA, 200 Ib).
6.2 Capital Costs
Cost is typically the most important selection criteria utilities use to make renewal method selection
decisions. If technologies are capable of meeting the needs of the utility, which is to provide quality
service to its customers, then cost is the primary driver when selecting between multiple options. Capital
cost estimates can vary from engineering order of magnitude estimates to contractor firm prices, the
tightness of the estimate depending on the overall objective of the project, and the degree of project
definition (Corbitt, 1990). Order of magnitude estimates are used in feasibility studies and provide
guidance on basic decision making. Comparative estimates combine an order of magnitude estimate with
the specific factors of a particular project and are developed for comparing alternative solutions to a
particular problem (Corbitt, 1990). As the needed accuracy increases, the information required for
developing the costs becomes more extensive.
Capital costs are both direct and indirect. Direct costs include equipment, labor, materials, and disposal
costs. Indirect costs include services such as administrative and legal costs, engineering fees, and
contractor profit and overhead. These latter costs are generally derived from cost indices. Among the
more common indices used are the Bureau of Labor Statistics, Construction Cost Index, and the
Engineering News Record Building Cost Index for the various regions of the country. EPA also has its
own indices that are published by the Municipal Facilities Division. These indices are updated
periodically by monitoring various components of costs, such as labor, material, etc., and comparing them
with the costs of a base year.
During the data collection process, cost information was sought for each of the technologies described in
the datasheets, but very little cost data were able to be collected from the vendors and manufacturers.
However, Table 6-2 presents representative costs that can be used to estimate order of magnitude costs for
water distribution pipeline rehabilitation and replacement methods (Selvakumar et al., 2002).
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Table 6-2. Summary of Rehabilitation Method Order of Magnitude Costs
Method
Cement mortar lining
Sliplining
Close-fit pipe
Fold and form pipe
CIPP
Pipe bursting
Epoxy lining (cost in $/ft)
HDD
Microtunneling
Diameters (in.)
4-60
4-108
2-42
8-18
6-54
4-36
4-12
2-60
12 - 144
Generic Cost ($/in. diameter/ft)
1-3
4-6
4-6
6
6-14
7-9
9-15
10-25
17-24
Reference
Gumerman etal., 1992
Gumerman etal., 1992
Authors, 1999
Jeyapalan, 1999
Gumerman etal., 1992
Boyce and Bried, 1998
Conroy etal., 1995
Boyce and Bried, 1998
Boyce and Bried, 1998
The costs presented in Table 6-2 only address base installation costs of the various techniques for order of
magnitude purposes. Separate items which would need to be considered in the total cost include:
replacement of valves; fire hydrants; other contingent work; traffic control; utility interference;
obstruction removal; bypass piping; and temporary service connections (Selvakumar et al., 2002).
Another study developed average costs for water main rehabilitation based on previous projects in central
Ohio (Osthues et al., 2005). Although not broken down by method, the study reported average minor
(non-structural) rehabilitation to be approximately $3.75/in. diameter/ft; and major (structural)
rehabilitation to be approximately $6.50/in. diameter/ft.
Although some rehabilitation options are less expensive than replacement methods, some are inherently
more risky. This additional risk can, in some cases, outweigh the benefits of rehabilitation technologies
and potentially offset the cost savings. For example, some rehabilitation technologies will have shorter
service lives than replacement methods and would require additional investments prior to the end of a
replacement pipe's service life. Therefore, the full life-cycle cost of a given technology should be taken
into account, along with the anticipated extension provided to the water main's remaining asset life.
6.3
Life-Cycle Costs
Life-cycle costing is an important consideration when selecting renewal alternatives. It is important that
the selection of the appropriate renewal method be made using as many appropriate evaluation criteria as
possible, and not based solely on economic considerations. For many investment decisions, the cost of
investment can be compared with the anticipated return to determine the financial viability of the project.
For a water utility, however, the decision is not purely economic as the public welfare, philosophical and
policy criteria are also key components. Deb et al. (2002) suggests that the cost categories in any life-
cycle cost model include capital costs (or installation costs, Section 6.2), O&M costs, and social costs.
Other elements of the cost analysis include the time value of money, the cost of capital, and the life of the
asset or planning period over which future costs or benefits are amortized. Given all this information, the
most cost effective technology can then be selected using either net present value analysis or an
equivalent uniform annual cost analysis. More information on how to conduct a life-cycle cost analysis
for water mains can be found in Deb et al. (2002) and on social cost considerations in Matthews (2010).
6.4
Maintenance Requirements
Maintenance of the pipe pre- and post-renewal is equally important. Maintenance measures can be
proactive and reactive. Routine and non-routine maintenance programs may incorporate new
technologies to maintain rehabilitated sections. Such sections behave differently from existing
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infrastructure. After installation, these rehabilitated sections may be subject to increased costs to inspect
their condition and to understand their behavior at joints with existing pipe materials.
Maintenance of lined pipes requires additional steps. The techniques needed for the repair of pipes with
liners are not well understood by crews in charge of O&M in a water utility. Adding a new unfamiliar
material and/or technology can be a factor in technology selection as it may be reluctantly received by
utility crews. Therefore, the O&M requirements should be considered early in the technology selection
process to understand the vendor recommendations. In addition, if hydrants or valves are replaced on
such pipes, it becomes important to check the compatibility of appurtenances with the rehabilitated pipe.
A good connection is imperative as is the chemistry between materials, adhesives, and other chemicals
that are used in the process.
6.5 Bypass Piping System Requirements
For most water rehabilitation techniques, keeping the customers supplied with potable water is a major
consideration. This is typically done using temporary pipe laid in gutters on each side of the street. The
temporary pipes are generally 2 to 4 in. in diameter and are supplied from nearby fire hydrants as
illustrated in Figure 6-2 (AWWA, 200Ib). Under extraordinary circumstances, bypass pipes can range up
to 12 in. in diameter and sometimes a tap or connection to an adjacent main is required.
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Bypass piping is available in 2-. 4-,
6-or8-in. (SO-.100-. 150-or
200-mm) diameters. In special
situations larger diameter bypass
can be obtained to meet project
requirements.
V
End-Capped Pipe
lex Bypass Feed
Temporary Fire Hydranl
Commercial Large-Diameter
Service Connection
Basemeni Connection
Sill Cock Connection
Meier Pit Connection
Temporary Connectjon Jo
Fire Protection System
Fire Hydrant (or Bypass Feed
* Out-of-Servtce
Section of Pipeline Being
Cement-Mortar Lined
Sideline Tap for Bypass Feed
n-wtnod
Figure 6-2. A Typical Layout of Bypass Piping
Processes and equipment used in water systems must provide assurance that the system is kept free of any
contamination, and the system must be disinfected and tested for bacteria before return to service.
Because invasive work on water systems will often involve time-consuming bacterial testing, bypass
supply systems may be needed. This is true even if the in-pipe work takes only a few minutes.
Short sections of hose are used to connect the bypass pipe to the services at the meter or directly to an
exterior faucet. Where the bypass pipe crosses driveways, special rubber ramps or cold asphalt mix
mounded over the pipe permit the passage of vehicles. Rehabilitation contractors often have crews that
specialize in installation and removal of such systems, and the work can be a major project in itself.
Another issue that must be taken into account is ensuring enough hydrants remain in service.
6.6
Disinfection Requirements
Any new or repaired water main must be thoroughly flushed, disinfected, and tested for bacteriological
quality before it can be put into use. Flushing is primarily necessary to remove any mud or debris that
was left in the pipe from the installation. One or more fire hydrants should be used to perform the
flushing. A blow-off connection, if one has been installed, can also be used. The velocity in the pipe
should be maintained long enough to allow two or three complete changes of water for proper flushing. If
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the pipeline is large or if the water plant capacity is not sufficient to supply the quantity of water required
for flushing a new main, the pipe can be cleaned with pigs.
Chlorine compounds are the most common chemicals used to disinfect large pipes. Calcium hypochlorite
and sodium hypochlorite solutions are generally used for smaller pipes. The chlorine solution is usually
injected through a corporation stop at the point where the new mains connect to the existing system.
Water utility personnel must ensure that excess chlorine does not flow back into the potable water supply.
All high points on the main should be vented to make sure there are no air pockets that would prevent
contact between the chlorinated water and portions of the pipe wall. These chlorination requirements
should normally conform to the AWWA Standard C651 for disinfecting water mains, unless there are
other overriding local, federal or State requirements (AWWA, 2005). In general, the rate of application
should result in a uniform free chlorination of at least 25 mg/L at the end of the section being treated.
Methods of rapid chlorination are discussed in Rockaway and Ball (2007). Calculations on chlorine and
water needed for proper disinfection involve determining:
• Capacity of the pipeline
• Desired chlorine dosage
• Concentration of the chlorine solution
• Pumping rate of the chlorine solution pump
• Rate at which water is being admitted to the pipeline
Materials in some rehabilitation technologies may be sensitive to contact with chlorine. If this is the case,
the manufacturer will recommend a maximum dosage of free chlorine during the disinfection process and
a minimum flushing volume (e.g., duration and flow rate) prior to return to service.
6.7 NSF/ANSI 61 Requirements
Federal and State governments encouraged the development of a consensus standard that could filter out
products not suitable for use in the conveyance of potable water. NSF in Ann Arbor, Michigan
spearheaded the development of NSF/ANSI Standard 61, which covers products in direct contact with
potable water. Pipe and joining materials must undergo a searching evaluation of formulation,
toxicology, and product use and a rigorous testing program that includes water immersion under
controlled conditions and testing for migration of contaminants, odor, and taste. The testing protocol can
take up to 6 months and the cost to the supplier interested in getting an NSF listing against Standard 61
will reach tens of thousands of dollars.
NSF/ANSI Standard 61 Drinking Water System Components - Health Effects establishes minimum health
and safety requirements for chemical contaminants and impurities that may be indirectly imparted to
drinking water and covers many items including, but not limited to:
• Plastic materials, plastic and metal pipe and related products (fittings, tanks, etc.)
• Protective materials (coatings, linings, cement, cement admixtures, etc.)
• Joining and sealing materials (adhesives, lubricants, elastomers, etc.)
• Process media (carbon, sand, ion exchange resin, etc.)
• Treatment/transmission/distribution devices (valves, pumps, filters, chlorinators, etc.)
• End-point devices (faucets, end-point control valves, etc.)
NSF/ANSI Standard 61 does not address all aspects of product use. The standard is limited to addressing
potential health effects except where specific application and performance standards are referenced.
Some items not addressed by this standard are performance (such as long term pressure), microbiological
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growth support, and electrical safety. Other standards may address these aspects of products. NSF/ANSI
Standard 61 is divided into nine sections and four annexes that can be found at www.nsf.org.
In the U.S., it is virtually impossible to supply a pipe, liner, or sealing mechanism (i.e., gasket) for a
potable water application that is not NSF/ANSI Standard 61 listed. Products that are made from organic
compounds, such as polyester resins and their catalyst systems, especially if they incorporate styrene,
have particular difficulties in this regard.
When the chemistry is brought to the field and curing is done under non-laboratory or less controllable
conditions, it becomes even more difficult to get an NSF/ANSI Standard 61 listing. Some CIPP liners
have achieved acceptance by using epoxy resins, which are more costly than polyester resins, or by
incorporating a PE or PU coating that separates the resin body from the potable water stream.
6.8 Accessibility Issues
Access to the pipe, leakage, or the segment that is to be renewed is a critical factor in choosing the
technology. Certain pipes are buried deep below cable and electricity lines, while some water mains are
laid close to the surface. In each of these cases, the cost and application of technologies will be different.
Renewal of buried lines requires additional steps at the job site. Obtaining permissions and regulatory
approval for digging large areas, pavements, and private properties can be a complex process. In such
cases, it would be very helpful for the utility to use techniques and methods that give flexibility in
accessing the pipe at locations that are removed from the point of replacement. Improvising access to
pipes can become a factor in pipe renewal.
Access to pipes for rehabilitation or replacement is not the only concern. Excavation to make service line
reconnections is also a key issue. Mains that have risers, bends, valves, and hydrants at fairly short
distances can affect the total project cost. The cost of making such excavations could make open cut
replacement an equally feasible option for the utility. Service line reinstatement also increases the cost of
restoration work, fees, and the number of permits required to do the job.
6.9 Asset Criticality
Water distribution systems can be considered critical infrastructure and the capability to operate at normal
operating requirements is of prime importance. Customers expect access to drinking water on a 24 hour a
day basis. If they are notified of interruptions to supply for maintenance works they expect the period to
be minimized and adhered to. Therefore, undertaking construction or renewal jobs on an active pipeline
network has to be well managed. Scheduling machinery, material, and manpower is necessary to start
and finish the job on time. Establishing bypass lines, providing water to hospitals and other emergency
services, and understanding the complexity of the job are necessary for completion of the work within the
designated time. Curing time of a renewal technique is important for the utility. If renewal is taking
place in a network that has limited or no redundancy, then the renewal of the pipeline has to be done in a
short period of time. Certain mains may be the sole distribution mains to a town or a cluster. In that case,
the utility may consider replacing the pipe. Conservative policies can sometimes be the right approach
with new technologies, especially because water transport is critical to life and day-to-day activities.
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7.0: DESIGN AND QA/QC REQUIREMENTS
This section presents existing design concepts and QA/QC requirements that pertain to renewal of water
mains. Multiple design manuals and regulatory specifications exist in the U.S. water utility market.
AWWA, ANSI, ASTM, ASME standards are primarily used and BS or ISO standards may be referenced
where relevant. Material standard specifications and installation and testing manuals are also developed
by trade associations and industry research organizations such as PPI, DIPRA, or Uni-bell. Some
standards, such as ASTM F-1216, incorporate design procedures, while others are used to regulate
product acceptance, installation methodology, in situ evaluation, and acceptance procedures. This section
also covers the QA/QC aspects of renewal by looking at short-term factory and field requirements, as well
as long-term qualification requirements.
7.1 System Design
Water infrastructure is a system from which continuous performance is demanded. Since some
intervention is inevitable for maintenance during the service life of the system, it is desirable to
incorporate either redundancy or reticulation into the design. This enables supply to be maintained by
alternative routes through the system when interventions for maintenance or rehabilitation take place.
However, such redundancy is rarely extensive within water distribution networks.
7.2 Renewal Design
Water main renewal design based on the AWWA M28 Manual Rehabilitation of Water Mains and can be
categorized into four classes of design for rehabilitation, ranging from non-structural to fully structural
(AWWA, 200la). The four classes are described below:
Non-Structural
• Class I - provides no structural support, only acts as an internal corrosion barrier and improves
water quality.
Semi-Structural
• Class II - resists external hydrostatic pressure from groundwater, bridges over holes and gaps in
the host pipe, but not able to carry the full internal pressure independently, adheres to the interior
surface of the host pipe.
• Class III - same as Class II except has sufficient thickness to resist bucking from external
hydrostatic load or vacuum load and is not dependent on adherence to the host pipe wall.
Full Structural
• Class IV - independently capable of resisting external hydrostatic pressure from groundwater,
and can handle the full internal pressure without support from the host pipe.
Water mains must have adequate strength to sustain external loads and internal pressure. Structural
capacity can be expressed in terms of an internal pressure rating, its D load (load capacity per unit length),
tensile strength, and flexural strength. External load is the pressure exerted on the buried pipe. This
pressure is a result of the backfill, groundwater pressure, and traffic loads. The pipe must be able to resist
loads imposed during installation (such as jacking forces when installed by microtunneling, or pulling
forces if installed by HDD). Additionally, the pipe must be able to accommodate a reasonable amount of
external damage from impact during transportation and temporary storage at the worksite. Pipe
characteristics are frequently defined as follows:
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• Internal pressure is the hydrostatic pressure within the pipe. Normal water pressure depends on
local conditions and requirements. Surge, also known as water hammer, is a momentary increase
in pressure. It may be caused by a sudden change in velocity or direction of water flow, the rapid
opening or closing of valves or hydrants, or the sudden starting or stopping of pumps. Water
hammer may result in shock, or transient pressure several times normal pressure. It can cause
extensive damage, such as a ruptured pipe and damaged fittings. One of the more significant
advantages that thermoplastic pipes provide is that surge pressures are lower than those
associated with higher modulus materials of similar dimensions such as DI pipe. These lower
pressure surge responses enable PVC and PE pipe systems to provide conservative factors of
safety with regard to handling dramatic transient velocity changes. PVC and PE pipes are able to
withstand short duration pressure surges, which are of the order of three times their pressure
ratings. This helps to prevent failures resulting from power outages and system interruptions.
• Tensile strength is a measure of the resistance a material has to longitudinal stress, the applied
force per unit area, or lengthwise pull before that material fails. Tensile strain is the increase in
length of a specimen subject to tensile stress. Tensile modulus is the ratio of tensile stress to
tensile strain. Metallic materials are characterized by high strength and relatively low strain at
failure and have a relatively high modulus. Plastic materials have lower strength and greater
strain at failure and exhibit lower modulus. Cementitious materials have relatively low tensile
strength and strain at failure due to the presence of microcracks which causes brittle failure.
• Flexural strength, strain, and modulus are the corresponding values measured in bending
without breaking. Materials may also exhibit characteristic yield that is a significant increase in
strain without a corresponding increase in stress. After the yield point, materials tend to behave
plastically until failure occurs. Ductility, the ability to absorb energy on impact, is often
measured as the area under the stress-strain curve. Plastic materials exhibit a large area under the
curve whereas brittle materials like concrete have low area under the stress-strain curve.
• Pipe shear or beam failure may occur due to ground movement, uneven bedding, or excessive
traffic loading. Smaller diameter pipes, particularly brittle materials like CI or AC, may be prone
to shear failure. Failure may be initiated at a defect in the pipe wall such as a corrosion pit.
7.2.1 Pressure and Stiffness Rating. Pipes and pipe linings should be carefully selected to ensure
that the pressure and stiffness rating of the pipe or lining are sufficient to sustain the internal pressure and
external loads indicated in the design. Pressure and stiffness ratings for pipes are usually specified by the
manufacturer and ratings can be calculated for linings using formulas and tables found in current AWWA
and ASTM standards. Distribution system piping should have a pressure rating of 2.5 to 4 times the
normal operating pressure. When a section of pipe is being replaced, the new piece must have a pressure
rating equal to or greater than that of the piece being replaced.
Specific minimum requirements or standards for all types of pipe have been established and published by
AWWA to ensure adequate and consistent quality of water mains. Other agencies that have established
standards for pipe include federal and state governments and organization such as Great Lakes-Upper
Mississippi River Board (GLUMRB, 2007) of State Public Health Environmental Managers, Underwriter
Laboratories (UL), NSF International, ASTM, and the manufacturers. These standards, which cover
methods for design, manufacture, suitability for contact with potable water, and installation in detail may
be used for specifying pipe or liners for specific applications.
7.2.2 Durability. Durability is the degree to which a pipe will provide satisfactory and economical
service under normal conditions of use. It implies long life, toughness, and the ability to maintain tight
joints with little or no maintenance throughout the service life of the pipe. The expected durability for
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pipe and liners is generally at least 50 years. Some standard specifications include tests intended to
demonstrate durability. Pipe and linings may be subjected to internal pressure or external loading for
10,000 hours in wet or chemically aggressive conditions to determine creep rupture or strain corrosion
performance as a demonstration of resistance to service conditions.
7.2.3 Corrosion Resistance. Consideration must be given to pipe's resistance to both internal and
external corrosion. Metallic pipes (e.g., steel or DI) may be corroded by the water they carry and may be
coated internally with cement mortar, calcite, phosphate, or epoxy. Metallic pipe may be prone to attack
from corrosive soils unless special coatings are applied to the pipe exterior as well. The pipe may be
protected by a plastic wrap or provided with special cathodic protection.
7.2.4 Smoothness of Inner Surface. Smooth pipe walls ensure maximum flow capacity for water
pipe. The roughness coefficient or C-factor of a pipe is a measure of the pipe wall roughness that retards
flow because of friction. A high C-factor denotes a smooth pipe. When a pipe is renewed by lining, there
may be a loss of cross-sectional area and a smooth lining may compensate for this loss and restore
original flow capacity.
7.2.5 Ease of Tapping and Repair. The pipe or liner selected should be easy to repair and tap for
service connections. It should support the service connection firmly without cracking, breaking, or
leaking. The tapping connection should be easily replaceable or at least repairable. Where a pipe is
renewed by lining, remote reinstatement of the service connection is preferred to minimize disruption,
although these techniques are relatively new. However, reinstatement of the service connection by an
open cut method may be acceptable where it is also necessary to renew the service pipe.
7.2.6 Water Quality Maintenance. The pipe or liner must be able to maintain the quality of the
water distributed by the system. It should not add taste, color, odor, chemicals, or other undesirable
qualities to the water. Pipes or liners and all fittings used for renewal must be suitable for contact with
potable water. Inorganic coatings such as factory applied CML and site applied CML have been available
since the 1930s. The in situ applied coatings, such as calcite developed by McCauley in 1958 or zinc
orthophosphate, may be effective in preventing corrosion for some years and have little impact on water
quality. Polymer coatings such as epoxy and polyurethane have been developed more recently. Concerns
have been raised that these coatings may release chemicals into the water and only coatings having
ANSI/NSF 61 certification should be used in water mains. In the U.S., ANSI/NSF 61 certification is the
principal water quality determination and acceptance criterion. The certification procedure described
earlier involves identification and screening of all chemicals used in manufacture, processing and
installation, process and procedure audit, and extensive testing for specific potentially harmful substances.
7.3 Product Standards
Various ASTM standards are available in the market for product design and testing. Typically, vendors
perform the testing according to the ASTM standards (Table 7-1) to provide assurance for their product.
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Table 7-1. Key Parameters for Renewal Design
Parameter
ASTM
Definition and Testing Procedure
Abrasion
Resistance
D-4060
(2010a)
Tests a liner's ability to withstand the constant flow of liquid and
participates. The Taber abrasion test involves rotating a sample under a
specific weight against a grinding wheel for a defined number of
revolutions. The samples are evaluated by measuring the weight of the
sample before and after the test. The resulting weight loss indicates the
ability of the liner to resist abrasion.
Adhesion
D-4541
(2009d)
Adhesion of a lining system to the substrate is considered a good indicator
of the liner's ability to resist corrosion. Generally, the better the adhesion,
the longer the liner will last. The adhesion test measures the pull-off
strength of a lining system by determining the perpendicular force the
material will withstand before releasing from the surface or pulling apart
cohesively.
Cathodic
disbondment
and
Salt spray
resistance
G-95
(2007)
and
B-117
(2009e)
Cathodic disbondment and salt spray resistance both measure the
undercutting resistance of a lining system. Cathodic methods are found to
be more consistent in their ability to predict actual lining performance.
Liners with better cathodic disbondment resistance have better corrosion
resistance and greater longevity.
Chemical
Resistance
D-714
(2009f)
Chemical resistance test methods monitor the effect of a chemical solution
when the liner is applied to a metal coupon. The evaluation is completed by
observing the sample for blisters and general appearance after immersion in
test solutions. Accelerated testing using higher concentrations can be
performed to provide long-term service life estimates.
Flexibility
D-522
(2008e)
Flexibility is an indicator of the liner's ability to withstand cracking,
disbonding, or other mechanical damage that can occur from handling and
bending of the pipe in the field and in the factory. Lined steel samples are
bent to determine their ability to withstand bending before liner failure.
Impact
Resistance
D-2794
(2004)
The impact resistance test represents the liner's ability to withstand damage
due to impact with another object. The test method consists of a fixed
weight being dropped from varying heights to produce a point impact on the
liner surface. The results are measured in terms of energy required to
rupture the liner and create a holiday or discontinuity.
Water
Absorption
D-570
(201Ob)
A measure of the ability of a waterborne chemical or gas to penetrate the
liner to the substrate. Samples are immersed in potable water at 50°C for 48
hours and the weight of the samples before and after immersion in water are
noted. Results are noted in percentage of weight change. The lower the
resulting number, the better the liner is at resisting blisters and disbondment.
7.4
Installation Standards
Installation standards vary for different rehabilitation techniques. The AWWA M28 manual provides a
comprehensive list of installation standards (AWWA, 200 Ib). Vendor and industry organization
approved standards and recommended practices are also available. Many of the pipe and liner products
used for water main renewal are flexible pipes where the performance of the installed pipe or liner is
heavily dependent on support from the pipe bedding or surrounding pipe. It is important that the
manufacturer's recommendations are followed during the installation process so that the pipe or liner is
able to mobilize the surrounding support in service. Technology specific installation standards are
summarized in the following sections.
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7.4.1 Cement Mortar Lining. CML is not designed to replace the host pipe, but to prevent further
structural weakening by preventing corrosion of the pipe. CML has been used in the U.S. since the mid-
19308 and its use is widespread throughout the world (AWWA, 200 Ib). It relies on the integrity of a
cement mortar layer to provide a protective barrier and the alkalinity of the mortar to inhibit corrosion.
AWWA C602-06, Standard for Cement Mortar Lining of Water Pipelines in Place - 4 in. (100 mm) and
Larger, provides details of process monitoring and pipeline acceptance testing (AWWA, 2006).
7.4.2 Polymer Spray Linings. In situ spray lining of water pipelines with epoxy resin was
developed in the UK in the late 1970s (AWWA, 200Ib). Epoxy spray lining was adopted by many UK
water companies in the 1990s and first approved in the U.S. to ANSI/NSF 61 in 1995. Recently,
polyurethane spray lining, which offers a more rapid cure and the potential to deliver high build linings,
has displaced epoxy from the UK marketplace and is entering the U.S. market. Polyurea spray linings are
also being introduced in the U.S. AWWA C620-07, Standard for Spray-Applied In-Place Epoxy Lining
of Water Pipelines, 3 in. (75 mm) and Larger, provides details of process monitoring and pipeline
acceptance testing (AWWA, 2007c). Water Research Center (WRc) publications IGN 4-02-02, Code of
Practice: In Situ Resin Lining of Water Main (WRc, 2007) and IGN 4-02-01, Operational Requirements:
In Situ Resin Lining of Water Main (WRc, 2010) provide additional insight into UK experience in the
application of polymer spray lining of water mains.
7.4.3 Sliplining. For sliplining, the insertion pipe should be sized so that its OD is typically 3 to 4
in. (75 to 100 mm) smaller than the inside diameter of the host pipe to allow for smoother insertion.
Possible obstructions at the pipe joints and taps, and the normal friction created during the insertion
process dictate a conservative approach to liner pipe sizing. Pipe manufacturers typically recommend
sizing of available liners. Most pipe sizes are standard iron pipe size, but special diameters are also
available for sliplining. The operation procedures for sliplining are discussed in AWWA M28 (AWWA,
2001b).
7.4.4 Close-Fit Lining: Symmetrical Reduction. Close-fit lining by symmetrical reduction may
be achieved with a tension based or compression based process. A liner pipe with an OD close to inside
diameter of the host pipe is pulled through a die or pushed or driven through rollers to achieve the
required symmetrical reduction. The reduced diameter pipe is pulled into place and reverted to size to
form a close-fitting liner by application of internal pressure. Close-fit liners may perform as semi-
structural or fully structural liners (AWWA Class III or IV) depending on the installed thickness achieved
with the reduction process. The operation procedures for close-fit lining are discussed in AWWA M28
(AWWA, 200Ib).
7.4.5 Close Fit Lining: Fold and Form. Close-fit lining by the fold and form process involves the
reduction of the outside diameter of a liner pipe selected to fit tightly within the pipe to be lined. The
selected pipe must be smaller than the pipe to be lined so that when reverted, the liner pipe is fully
circular and not prone to buckling failure. The liner is reverted by application of internal pressure. The
forces required to fold thicker walled liner pipes may be substantial and many fold and form systems are
employed as semi-structural pipes (AWWA Class III). The operation procedures for fold and form lining
are discussed in AWWA M28 (AWWA, 200Ib). Installation standards for fold and form with PVC
materials are included ASTM F-1867 (ASTM, 2006b) and for PE materials in ASTM F-2719 (ASTM,
2009g).
7.4.6 Cured-in-Place-Pipe. The tube may be manufactured from polyester felt, reinforcing fiber
fabric, or fiber reinforced felt to suit specific host pipe dimensions. The liner is impregnated with an
appropriate resin either at the work site or in the factory. The requirements of ANSI/NSF 61 determine
the type of resin or resin and coating employed. The resin-impregnated liner may be cured at ambient or
elevated temperature using steam or hot water or by exposure to UV light. The installation, curing, and
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cooling recommendations of the system provider should be implemented to ensure adequate cure. CIPP
liners may be semi-structural or fully structural (AWWA Class III or IV). ASTM F-1216 includes
calculations for pressure capability for hole and gap spanning and fully structural liners (ASTM, 2009a).
Other CIPP installation standards include ASTM F-1743 (ASTM, 2008c) and ASTM F-2019 (ASTM,
2009h).
7.4.7 Woven Hose Lining. Woven hose linings generally provide a semi-structural (AWWA
Class II) capability at typical operating pressures and are used for severe internal corrosion, pinhole leaks,
or faulty joints. The installed liner is very thin and its high 'C' value and joint-free construction may
allow flow rates identical to original pipe. Some variants of the woven hose liner, which incorporate
additional impregnated felt layers to impart stiffness, can also be considered as semi-structural self
supporting Class III liners when cured, reducing their dependence on the condition of the host pipe.
Design considerations for Class II and III liners include hole and gap spanning in accordance with ASTM
F-1216 and an additional determination of resistance to buckling for Class III liners when empty and
subject to external hydrostatic load and internal vacuum (ASTM, 2009a).
7.5 QA/QC Requirements
QA/QC procedures are required and specified in many cases by the utility owners and basic requirements
are included in the product and process specifications developed by AWWA, ASTM, and vendor
organizations. Assurance in the form of test certificates can be provided by the manufacturer or by the
licensed seller of the products. The contractor in most cases provides a level of process QC, which may
be supervised by third party consultants and testing agencies. Technology specific QA/QC practices are
covered in details in the EPA report, Quality Assurance and Quality Control Practices for Rehabilitation
of Sewer and Water Mains (EPA, 201 Ib).
7.5.1 Short-Term Quality Monitoring. To take full advantage of the estimated design life of the
various rehabilitation technologies, it is important that the installer follows the manufacturer's or system
provider's recommendations and implements proper installation procedures, and that the finished
installation quality is confirmed by good QA/QC practices. Qualification (i.e., proof of design) testing is
typically performed on the materials and the related installation process to define applicability of a
particular technology. The installation process is given control limits by the technology system
manufacturer or the standard specifications of relevant agencies that allows the installer to demonstrate
the finished quality of the installation during the execution of the work and prior to acceptance testing by
the owner. QA and acceptance testing confirms that the installation is consistent with the product that
was pre-qualified in the design phase and that it should meet its design performance expectations.
Short-term quality monitoring activities include checks of raw materials for lining, testing of materials
applied in the field to ensure design parameters are met, and pressure and hydraulic testing of the system
post-installation to ensure system requirements are met. Specific monitoring activities for the
rehabilitation technologies are listed in Table 7-2. Detailed checklists for technology specific QA/QC
practices can be found in the EPA report, Quality Assurance and Quality Control Practices for
Rehabilitation of Sewer and Water Mains (EPA, 201 Ib).
Table 7-2. Short-Term QA/QC Standards
Technology
CML
Polymer spray liners
Fold and form liners
Close-fit PE liners
CIPP
Standard
AWWA C602 (2006)
AWWA C620 (2007c)
ASTM F-1871 (2002)
ASTMF-2718(2009i)
ASTMD-5813(2008f)
Comment
Includes checks on raw materials, cement, sand, and water.
Includes checks on raw materials and approvals.
Includes evaluation and testing for fold and form PVC.
Includes evaluation and testing for close-fit PE materials.
Includes evaluation and testing for CIPP materials.
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QA is the responsibility of the system owner, the designated project engineer, and the authorized quality
manager or agency. Whether utilizing prescriptive specifications or performance specifications, it is
important that communication with the installer convey what QA testing will be performed, and that the
contract documents establish these requirements as mandatory and specify such remedial measures as
may be necessary. Pipeline construction and renovation projects often have adequate specifications for
QA testing, but implementation and supervision are important as well. Samples of the finished
installation need to be taken, placed in safe custody, and properly tested by qualified third-party
laboratories to confirm that the minimum mechanical properties have been achieved. It is generally
preferable that the relationship with the testing laboratory providing the results of the testing undertaken
be between the owner and the laboratory, not the laboratory and the contractor. Contractually, there
should be a list of known problems that can arise and a specified remedy prescribed that is clear before
the work begins.
7.5.2 Long-Term Quality Monitoring. Any long-term performance testing requirements for
products to be used for water main rehabilitation are specific to the type of materials in the product as
most products or rehabilitation processes designed for renewal or replacement of deteriorated water mains
are relatively new. Aside from CML, there is relatively little information available on the long-term
performance of these new materials. QC procedures for the various technologies discussed herein are
typically given to the installation contractor by the system manufacturer. To further reinforce a system's
commitment to having a quality installation, the manufacturers will develop an ASTM installation
standard for their system. The following sections examine some of the requirements for PVC, PE, and
CIPP products.
7.5.2.7 PVC Long-Term QA/QC Requirements. PVC pipe meeting AWWA C900 (AWWA, 2007b)
or C905 (AWWA, 2010), or ASTM D-2241 (ASTM, 2009b) Standard Specification for Polyvinyl
Chloride (PVC) Pressure-Rated Pipe (SDR Series) is subjected to long-term pressure regression testing to
establish a hydrostatic design stress (HDS) for the pipe. Pipes are tested in accordance with ASTM D-
1598 (ASTM, 2009J) and the results analyzed in accordance with ASTM D-2837 (ASTM, 2008g). A
HDS or hydrostatic design basis (HDB) is determined, which is the maximum tensile stress the material is
capable of withstanding continuously with a high degree of certainty that failure of the pipe will not
occur. Fusible PVC and expandable PVC are made from standard C900 or C905 stock, so these are
qualified.
7.5.2.2 PE Long-Term QA/QC Requirements. PE pipe meeting AWWA C901 (AWWA, 2008) or
C906 (AWWA, 2007d) or ASTM D-3035 (ASTM, 2008h) is similar to PVC in that these products are
also subjected to long-term pressure regression testing. These tests establish a basis for the long-term
pressure rating of the products. There are no other long-term tests for standard PE pipe. PE used for
deformed liners under ASTM F-1533 is to be made from materials that have a PPI HDB of either 1,600
psi for PE 3408 or 1,250 psi for PE 2406 (ASTM, 2009k). However, there is no requirement for the
reformed PE liner to demonstrate that it has a similar HDB rating.
7.5.2.3 CIPP Long-Term QA/QC Requirements. ASTM D-5813 includes a long-term qualification
test for chemical resistance, which includes two requirements (ASTM, 2008f). The first is that the CIPP
specimens retain 80% of their flexural modulus of elasticity after one-year exposure to six chemical
solutions. The other chemical resistance requirement is the strain corrosion test requirement of ASTM D-
3681, developed for fiberglass pipes used in gravity sewers (ASTM, 2006c). Neither of these long-term
requirements is particularly meaningful for a CIPP liner in a water main application. Unfortunately, there
is currently no long-term pressure regression testing requirement for CIPP liners used in pressurized water
mains, similar to that for PVC and PE products.
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8.0: OPERATION AND MAINTENANCE
O&M of water networks encompasses many activities that can be affected by rehabilitation. The impact
of O&M on water distribution networks after rehabilitation is widely unknown mainly because of the
young age of water rehabilitation techniques. However, there are essential elements to consider:
• Can the rehabilitated pipe be readily located?
• Can the rehabilitated pipe be controlled (i.e., shutdown) for making future repairs?
• Can future defects (e.g., leaks) be readily identified and pinpointed?
• Can anticipated future connections and controls be installed?
The ability of a utility's repair crews to skillfully carry out emergency repairs on rehabilitated water
mains is another important consideration. In addition, proper cleaning is essential both prior to
rehabilitation activities and during routine operations to improve the capacity and hydraulic performance
of water mains. This section also reviews best practices for O&M that can be effective in either
prolonging the life of a water main or allowing a utility to monitor real-time performance so action can be
taken as needed to repair, rehabilitate, or replace the water main before a catastrophic failure occurs.
These methods include cathodic protection, corrosion monitoring, water audits, and leak detection.
8.1 Maintenance and Emergency Repair of Rehabilitation Systems
Maintenance departments at utilities have set procedures for emergency repairs of water mains. These are
dependent on material, type of emergency (break, leak, joint leak, etc.), and location. A rehabilitated
main effectively adds to the range of material that must be potentially repaired in an emergency. There
are no set procedures for repair of rehabilitated (i.e., lined) water mains. This is an area of concern for
utilities and certainly makes them reluctant to line their mains because they do not know how to deal with
them when emergency repair becomes necessary. This further influences the choice of replacement over
rehabilitation. The onus is on the suppliers of lining technologies to develop repair procedures for their
products in water main applications and to train utilities in their application. Procedures that require the
vendors' personnel to attend and undertake specialized work will not be adequate in emergency situations
where swift action is necessary.
8.2 Cleaning Methods
The selection and use of appropriate cleaning methods both before and after rehabilitation can be an
important factor in the success or failure of a water main renewal effort. For example, there is experience
that high pressure water jetting can cause damage to lining systems. Similarly, drag scraping of water
mains may damage linings and/or corporation stops prior to rehabilitation, which makes service
reconnection very challenging.
Cleaning is primarily undertaken to remove tuberculation and corrosion byproducts, which lead to
reduction in diameter of the host pipe and cause taste, color, and turbidity problems in the delivered
water. More rigorous cleaning may be required for detailed pipe surface and pipe wall inspections to
assess the host pipe condition. Prior to rehabilitation activities, rigorous cleaning will remove corrosion
products and expose bare metal, restoring the original diameter and providing a key for bonded linings or
an enhanced mechanical fit. Rigorous cleaning may also reduce the residual strength of the host pipe and
therefore could influence the choice of rehabilitation method.
Various cleaning methods are summarized in Table 8-1. Some are commonly used by water utilities,
while others are patented technologies used in tandem with the rehabilitation technology by a certain
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licensed operator. Descriptions are provided below of water jetting, pipeline pigs, drag scrapers, and
power borers that are commonly used in the water industry. More detailed information on these cleaning
methods can be found in Ellison (2003).
Table 8-1. Summary of Cleaning Methods Available to a Water Utility
Method
Flushing
Drag scraping
Hydraulic jets
Electric
scrapers
Rack feed
boring
Fluid propelled
devices
Chemical
cleaning
Air cleaning
Abrasive
particle
cleaning
Summary
Involves isolating sections of a main and allowing water to flow until the main flows
clear.
Mechanical scrapers are pulled through the pipe with a winch to remove hard
encrustations.
High-pressure water jets are used to dislodge and remove encrustations from pipe
surfaces.
Rotating scrapers on a cart controlled by an operator for use in larger diameter pipe.
Steel rods simultaneously rotate and are pushed through the main by an operator.
Requires water pressure to move though the pipe and requires chemicals to remove
hard encrustations. Readily available and commonly used by utilities.
Solutions of acid can be used to dissolve mineral deposits within the pipes. Various
acids are used with additives that do not harm rubber gaskets or valve seats.
Air at high pressure is forced through smaller diameter sections to remove scales and
deposits after draining the water.
Flint rock to steel shot or grit specified particles are air blown at high pressures. Such
cleaning is restricted to straight runs of a pipe and needs a particle collection system.
8.2.1 Water Jetting. High volume, low pressure water jetting is commonly used for pipe cleaning
prior to inspection and prior to non-structural rehabilitation such as CML and polymer spray lining. Low
volume, high pressure water jetting may be used where access to water is restricted or where water
disposal may be problematic. High pressure jetting may also be used to clean stubborn deposits, but may
exacerbate local corrosion damage or impact polymeric pipes. Jetting is particularly useful for removal of
light corrosion products rich in iron and manganese, which gives rise to water quality problems. Typical
jetting pressures range from 2,000 psi to 20,000 psi with flow rates from 2 to 80 gpm.
8.2.2 Pipeline Pigs. Utility pipeline pigs are usually made from a flexible solid or foamed plastic
fitted with solid plastic ribs, abrasive strips, or components such as carbide studs and wire brush heads
assembled on a mandrel tube. Pigs are propelled down water mains by pressure and can be propelled
several miles. Cleaning is accomplished by the frictional drag, and abrasive and flexible characteristics of
the foam pig, which removes foreign objects and leaves the metallic or plastic surfaces smooth and free
from debris and loosely adherent detritus and corrosion products. When water pressure is applied for
propulsion, a certain amount of water bypass (about 10%) helps to keep loose debris suspended out in
front of the foam pig. Cleaning of deteriorating mains may require a series of swabs and foam pigs
applied in progressively larger diameters until the pipe is restored to its original diameter.
8.2.3 Drag Scrapers. A metal cleaning scraper consists of a steel frame shaped like a piston.
Specially tempered steel blades are attached around the scraper at various angles to create a scraping and
brushing action (Figure 8-1). The cleaner is pulled through the main by winch via a steel tension cable
while water flows through the main under pressure to carry away debris. Cleaning is often accomplished
with a single pass in a continuous operation, however, interior pipe conditions may require more passes.
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•^••fl
Figure 8-1. Winch Cable with Drag Scrapers Attached
The length of pipe that can be cleaned hydraulically in one operation is limited by the availability,
volume, and pressure of water and a proper means of disposing of water and sediments. An opening must
be provided at each end of the section to be cleaned for entry and exit of the scraping tool. The volume of
water required to hydraulically clean a pipe will depend on how dirty the water is. Sufficient water must
be added behind the cleaner to fill the pipe as it moves ahead. The water that passes the cleaner scours
the wall of the pipe and washes ahead the material that is scraped off the pipe. While the velocity of
water ahead of the cleaner is independent of cleaner speed, it must be sufficient to remove the deposits.
Experience indicates that a flow velocity ahead of the cleaner of 2 to 10 ft/sec is required to remove the
deposits. The cleaning water and deposits must be discharged from the pipe in a way that avoids creating
an environmental problem. A sandbag dam can be used to create a pond for particle settlement, which
allows the clean water to be decanted to a storm drain while solid materials are collected and disposed of.
8.2.4 Power Boring. A rack feed boring machine is a compact, diesel powered unit that uses
hydraulic pressure to deliver up to 31 horsepower to a bore head (Figure 8-2) to clean and remove debris
from the pipe at a rate of up to 300 ft/day. The boring head is designed to accommodate steel boring rods
15 ft long, fitted with spring-loaded quick connects for connecting into suitable lengths for cleaning
various lengths of pipe. The end of a boring rod assembly is fitted with a spring steel cutter blade that can
rotate at 750 rpm through the pipe. This cleaning process is conducted against a controlled, upstream
water flow to flush loosened debris from the pipe.
Figure 8-2. Example of a Rack Feed Bore Head
The rack feed boring machine may be equipped with an adjustable boom to accommodate various pipe
depths and to control the angle at which boring rods are inserted into the pipe. The ratio of boring rate to
spring cutter blade revolutions can be predetermined and fixed to eliminate operator error. This setting
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ensures consistent results throughout the cleaning operation. The rack feed boring method leaves a pipe's
interior surface free from tuberculation and encrustation and can be effective for bends up to 22.5°.
8.3 Cathodic Protection
Cathodic protection systems may be used in association with a protective coating to provide long-term
corrosion protection. Interior coating systems will last significantly longer because the cathodic
protection will halt under-film corrosion at coating gaps. Cathodic protection systems can be designed
primarily using two methods: (1) impressed current and (2) corrosion inhibitors (National Association of
Corrosion Engineers [NACE], 1984).
8.3.1 Impressed Current. The choice of methods depends largely on the integrity of the interior
coating and its compatibility with cathodic protection. Typically, impressed current systems are used due
to their ability to be adjusted to protect an increased amount of exposed steel surfaces. Impressed current
systems can cause damage to certain polymeric paint systems if not carefully installed and operated.
NACE publishes the recognized standard for designing and testing cathodic protection systems for use in
water distribution systems (www.nace.org). A clear understanding of the soil characteristics and pipes
are required for effective use of the procedures.
8.3.2 Corrosion Inhibitors. Corrosion inhibitors are a useful source of cathode protection.
Corrosion can be controlled by adding chemicals to the water, which form a protective film on the surface
of a pipe and provide a barrier between the water and the pipe. These chemicals, called inhibitors, reduce
corrosion, but do not prevent it. The three most commonly used chemical inhibitors approved for use in
potable water systems are CaCO3 scale formation, inorganic phosphates, and sodium silicates. There are
several hundred of commercial products listed in various State and Federal agencies.
The success of any inhibitor in controlling corrosion depends upon three basic requirements. First, it is
best to start the treatment at two or three times the normal inhibitor concentration to build up the
protective film as fast as possible, which minimizes the opportunity for pitting to start before the entire
metal surface has been covered by a protective film. Second, the inhibitor must be fed continuously and
at a sufficiently high concentration, since interruptions can cause loss of the protective film by
redissolving it, which may lead to pitting. Thirdly, flow rates must be sufficient to continuously transport
the inhibitor to all parts of the metal surface otherwise an effective protective film will not be formed and
maintained and corrosion will then be free to take place.
8.4 Corrosion Monitoring
There are two primary categories of corrosion monitoring, namely indirect and direct. These two
methods are described in the following sections (Singley et al., 1985).
8.4.1 Indirect Methods. Indirect methods do not physically measure corrosion rates. Rather, the
data from these methods must be interpreted to determine trends or changes in the system. The indirect
methods include customer complaint logs, corrosion indices, and water sampling, which are described in
the following three sub-sections.
8.4.1.1 Customer Complaint Logs. Customer complaint logs can be the first evidence of an internal
corrosion problem in a water system, although the complaints may not always be due to corrosion. For
example, red water may also be caused by iron in the raw water that is not removed in treatment.
Therefore, in some cases further investigation is necessary before attributing the complaint to internal
corrosion in the system. Complaints can be a valuable corrosion monitoring tool if records of the
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complaints are organized. The complaint record should include a customer's name and address, date of
complaint, and description. The following information should also be included:
• Type of material used in the customer's system and type of lining
• Whether the customer uses home treatment devices prior to consumption
• Whether the complaint is related to the hot water system and if so what types of material
are used in the hot water tank and its associated appurtenances
• Any follow-up action on previous or current complaints by the utility or the consumer
These records can be used to monitor changes in water quality due to system or treatment changes. The
development of a complaint map is useful in pinpointing problem areas. The complaint map could be
combined with the materials map by overlaying GIS layers, which indicates the location, type, age, and
use of particular types of construction materials. If complaints are recorded on the same map, the utility
can determine whether there is a relationship between the complaints and the materials used.
8.4.1.2 Corrosion Indices. Attempts have been made to develop indices that would predict whether
or not water is corrosive; unfortunately most of these indices are of limited value. However, several of
the indices can be useful for predicting corrosion. These indices can be calculated by all utilities and can
be used in an overall corrosion program. The National Interim Primary Drinking Water Regulations
(NIPDWR) requires all community water supply systems to determine either the Langelier Saturation
Index (LSI) or the Aggressivity Index (AI) and report these values to the State regulatory agencies. The
LSI is based on the effect of pH on the solubility of calcium carbonate, while the AI is defined by
AWWA Standard C400 as the sum of pH and log of total alkalinity and calcium hardness (AWWA,
2003b).
Other corrosion indices include the Reynar Stability Index that uses the same parameters as the LSI, but
reverses the signs and doubles the pH. The Riddick's Corrosion Index is based on field observations, and
the values obtained are applicable to soft water on the East Coast, but not to the hard water found in the
middle part of the U.S. McCauley's Driving Force Index is also based on calcium carbonate solubility
and attempts to predict the amount of CaCO3 that will precipitate.
8.4.1.3 Water Sampling and Chemical Analysis. Since internal corrosion is affected by the
chemical composition of water, sampling, and chemical analysis of the water can provide valuable
corrosion-related information. Some waters tend to be more corrosive than others because of the quality
of water. For example, waters having a low pH (<6.0), low alkalinity (<40 mg/1), and high carbon
dioxide (CO2) tend to be more corrosive than waters with a pH greater than 7.0, high alkalinity, and low
CO2. Corrosion, however, depends on the action of water on the pipe material. Most utilities routinely
analyze their water to ensure that they are providing safe water to their customers and to meet regulatory
requirements. The 1980 Amendments to the NIPDWR require all community water supply systems to
sample for certain corrosive characteristics. Recommended sample locations for additional corrosion
monitoring within the system are:
• Water entering the distribution system
• Water at various locations in the distributions system prior to household service lines
• Water in several household service lines throughout the system
• Water at the customer's tap
Further analysis of the corrosion by-product material and an approved sampling technique is required of
utilities.
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8.4.2 Direct Methods. Direct corrosion measurements can involve the actual examination of a
corroded surface of the pipe or the measurement of corrosion rates, particularly actual metal loss. The
direct methods included are discussed in the following two sub-sections.
8.4.2.1 Examination of Pipe Sections. Examining the scale found inside a pipe is a direct measure
of corrosion, which can tell a great deal about water quality and system condition. It can be used as a tool
to determine why a pipe is deteriorating, or it can be used to monitor the effectiveness of any corrosion
control program. A high concentration of calcium in the scale may shield the pipe wall from dissolution
and reduce the corrosion rate. Direct inspection techniques include physical inspection, X-ray diffraction,
or Raman spectroscopy.
8.4.2.2 Rate of Wall Loss Measurements. Rate measurement is another method used to identify and
monitor corrosion activity. The corrosion rate of a material is commonly expressed in mils (.00 I/inch)
penetration per year. Common methods used to measure corrosion rates include: weight loss method
(coupon testing and loop studies); and electrochemical methods. Weight-loss methods measure corrosion
over a period of time. Electrochemical methods measure either instantaneous corrosion rates or rates over
a period of time. The coupon weight-loss method uses calculations from ASTM D-2688 Method B, while
the loop system weight-loss method uses Method C (ASTM, 2005). Another method that can be used is
the use of ultrasonics to measure wall loss over a period of time.
8.5 Water Audits and Leakage Detection
A water audit followed by a leak detection program can help water utilities reduce water and revenue
losses and make better use of water resources. A water audit identifies how much water is lost and what
that loss costs the utility. Leak detection is a survey of the distribution system to identify leak sounds and
pinpoint the exact location of hidden underground leaks. Basic leak noise detectors may be used by
utility teams and specialist contractors may be employed to survey water mains using tethered or free
flowing acoustic devices to pinpoint and quantify leakage sources.
The overall goal of the audit is to help the utility select and implement programs to reduce distribution
system losses. The cost of a water audit is the sum of in-house work and field work. The total cost
depends on the size of the service area to be audited, the completeness, currency, and accuracy of the
utility's records, including meter-testing programs and records, and the extent to which utility staffer
outside contractors and consultants are used to conduct the audit.
According to AWWA M36 Manual of Water Supply Practices: Water Audits and Leak Detection, leaks
usually can be divided by type into six categories, as shown in Table 8-2, based on where they occur
(AWWA, 2009). Leaks may be located in the main, the service line, a residential meter box, residential
service, or in valves and other appurtenances. Causes of leaks include improper installation, settlement,
overloading, third party damage, corrosion, and others.
The suitability for a water utility of a single leak detection technique or combination of techniques is
subject to a number of factors. The economic value of water that is being lost will play an important role
in determining an appropriate leak detection strategy. Water utilities with a high cost of water and large
losses may be able to justify an extensive system-wide leak detection program using sophisticated tools.
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Table 8-2. Various Categories of Leaks in a Network
Leaks
Main Leaks
Service Line
Leaks
Residential
Meter-box
Leaks
Residential
Leaks
Valve Leaks
Miscellaneous
Leaks
Comments
Leaks range from 1 gallon per minute (gpm) to over 1,000 gpm and may start due to corrosion.
Occur due to excessive pressure, improper installation, settlement, and overloading.
Leaks range from a low of 0.5 gpm to over 15 gpm. Leaks can be caused by a variety of
factors.
Leaks range from less than 1 gpm to 10 gpm. Leaks can be caused by loose spud nuts on the
meter, loose packing nuts, damaged or broken angle stops, couplings, broken meters, or meter
yokes.
Leaks range from less than 1 gpm to 15 gpm. Leaks can be caused by holes, breaks, inefficient
hose-bib or shutoff valves, interior plumbing lines, or fixtures.
Leaks range from 1 gpm to 500 gpm. Leaks are caused by loose packing, broken parts, etc.
and sometimes start in system controls.
Excessive pressure, settlement, overloading, improper installation, improper materials and
operation can also cause break in the valves.
The chosen techniques must also take into account the water system geography, infrastructure materials,
age, and expected condition. Also important is the ability of the water utility personnel in using the
chosen techniques, as adequate training and supervision may be required. More information on leakage
management technologies can be found in Fanner et al. (2007). The methodologies for leakage
management can be grouped into two distinct categories:
• General Methods for localizing leaks, which are those techniques that indicate the general
vicinity of a leak (e.g., visual, comprehensive, step testing, noise loggers).
• Specific Methods for pin-pointing a leak, which are those techniques that indicate the estimated
position of a leak where excavation for repair will take place (e.g., acoustic, general, leak noise
mapping).
A summary of specific characteristics of some leak detection techniques is given in Table 8-3.
Table 8-3. Various Leak Detection Techniques
Techniques
Visual Survey
Acoustic Survey
Sounding
Comprehensive
Survey
General Survey
Step Testing
Noise Logger
Survey
Leak Noise
Mapping
Comments
Most basic form of leak detection. Survey done by walking above the lines and looking for
signs of leaks, such as water pooling on the surface.
Various kinds of leak noise detection equipment are used. Frequency and magnitude of
noise generated by a leak varies with the type of leak, pipe material, diameter, and pressure.
Listens to all available fittings on the pipe and service connections. Time consuming but
effective in detecting leaks in the system.
Referred to as hydrant survey because it uses geophones and leak noise correlators for
pinpointing leaks. Less suitable for non-metallic pipes or pipes with many service lines.
Involves isolating sections of main from the zone and meter. Each time a section with a leak
is isolated there will be a marked drop on the data loggers that represents the leak volume.
Most useful for areas with high background noise and those where the avoidance of night
crew work for leak detection is necessary.
Leak is pinpointed immediately after localization and is most appropriate for areas with high
density hydrants.
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9.0: FINDINGS AND RECOMMENDATIONS
9.1. Gaps between Needs and Available Technologies
The available technologies for water pipeline renewal leave certain gaps or needs unmet. The following
subsections address these gaps and how they may be closed to provide utilities with decision-making
processes and rehabilitation technologies that will enable them to implement water main rehabilitation
programs. The gaps fall into two main categories: data gaps in terms of knowledge of the existing pipe
condition; and capability gaps in terms of the available renewal and rehabilitation technologies.
9.1.1 Data Gaps. The renewal process comprises three sequential elements: inspection of the
existing pipe; assessment of its condition from the inspection data; and renewal to restore the condition to
the desired for future service and performance requirements, and this process begins with data. Data may
be obtained either externally or internally. Obtaining external data requires excavation for inspection on
the pipe surface. For reasons of cost and practicality, this can only be done at a small number of discrete
locations along a pipeline. As a result, the sample size is extremely small and the confidence level of the
findings in terms of being representative of the pipeline as a whole is very low. Internal data can be
obtained over the full internal surface area of the pipe, but this typically requires the main to be shutdown
and dewatered for inspection, although some technologies do exit for live inspections. This is extremely
costly due to the service interruption. Alternative methods that obtain data from inside a pipe in service
are costly and still in early stages of development.
A broad range of inspection and monitoring tools is available in the market, and each provides data on
specific materials or characteristics. In general, the inspection technologies for pressure pipelines are
material-specific (i.e., they are suitable for just one, or a small range of pipe materials). The ability to
obtain some data of value from condition assessment is good for most pipe materials. Sophisticated
electromagnetic techniques exist for inspecting ferrous and PCCP that provide a robust basis for condition
assessment and renewal technology design. For other pipe materials, in particular AC and plastics, there
remain gaps in the ability to obtain such data without removing coupons or sections of pipe for off-site
inspection.
A further gap exists in terms of understanding the cost-effectiveness of obtaining data. This is closely
related to taking a risk-based approach. Condition data and subsequent assessment identify the likelihood
of failure. This is of value where the consequence of failure is serious (e.g., for large diameter mains or
main in critical areas). However, where the consequence of failure is not serious the value of the data is
low because it has no impact on decisions or actions (e.g., small diameter mains). Therefore, the cost of
obtaining it must also be low otherwise the data are not economic. There is a need for more economic
inspection technologies that can provide data more cost-effectively for lower risk locations or for
assessment methodologies that can work with limited data. Development of clear maintenance guidelines
and linking of O&M data, such as cathodic protection system and power consumption data, to condition
assessment is also necessary.
9.1.2 Capability Gaps. Through the course of these research efforts, it was recognized that only a
select number of water utilities in the U.S. have begun to utilize trenchless rehabilitation technologies,
other than CML. This suggests that significant market barriers still exist for water main rehabilitation
compared to what exists today on the wastewater side. This is due to the fact that most water utilities are
unfamiliar with emerging and innovative rehabilitation technologies and water utilities are typically
reluctant to be one of the first to try out new technologies. Section 4 of this report identified a large range
of technologies for repair, rehabilitation, and replacement of both mains and services for the full range of
transmission and distribution diameters, many of which are emerging in the U.S. water market. These are
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able to provide renewal that meets structural and hydraulic requirements in a variety of circumstances.
There remains a need to demonstrate innovative rehabilitation technologies that are new to the U.S.
market to evaluate their capabilities and performance and demonstrate their applicability to water utilities.
This will help to reduce the risk to water utilities in experimenting with new technologies and new
materials on their own.
Significant capability gaps do remain. There are a wide variety of piping materials in water distribution
systems requiring rehabilitation including challenges associated with appropriate and safe rehabilitation
options for AC pipe. There is a need for rehabilitation methods suitable for AC pipe materials, which
could help to reduce the need to remove AC pipe materials from the ground when renewals are required.
Thinner composite liners that reduce the amount of cross section loss would be favored by water utilities.
For some technologies, reopening service connections after lining still generally requires excavation at
each connection location for manual reopening and reconnection to the service pipe, often requiring a new
fitting. Where service connections are frequent, this becomes almost as disruptive as a full-length
excavation, thereby negating the benefits of a trenchless lining solution. Operational aspects such as
access requirements and the length of time that the main is out of service are also areas where gaps exist
between capability and customers' needs. Simplifying or minimizing access requirements could remove a
major barrier to the use of many rehabilitation methods and developing processes that limit service
interruption to one day will also overcome a significant operational barrier. The ability of a utility's
repair crews to skillfully carry out emergency repairs on rehabilitated water mains is also an important
consideration. There is a demonstrated need for suppliers of lining and similar technologies to develop
repair procedures for their products in water main applications and to train utilities in their application.
A gap also remains in the understanding of the long-term performance of the various rehabilitation
technologies and their materials. These materials and methods are young in terms and usage for water
main rehabilitation and they have not been subjected to retrospective analysis, which involves the study of
the installed performance of materials over their lifetime. There is a need to conduct a retrospective study
of the materials that have been used in distribution systems for more than 20 years to determine how well
these materials are performing and to determine if these materials can remain in service for their intended
designed service lives.
9.1.3 Benefits, Costs, and Challenges in Closing Gaps. Table 9-1 summarizes the technology
gaps identified in knowledge of the existing pipe condition and in the capability of the available renewal
and rehabilitation technologies.
Table 9-1. Benefits, Costs, and Challenges in Closing Gaps
Gap
Live Internal
Inspection
Assessment with
Limited Data
Applicability of
Rehabilitation
Methods
Reopening Service
Connections
Long-term
Performance of
Materials
Close By
Developing
technologies
Statistical
methods
Demonstrating
innovative
technologies
Developing
technologies
Retrospective
study of installed
materials
Benefit
Reduces cost and
disruption of service
Lower cost assessment
Evaluation of the
applicability of new
technologies
Substantial reduction of
required excavation
Understanding of actual
material service life that
could improve designs
Cost
High
Low
Medium
Medium
High
Challenge
Cost (likely beneficial for
large and high risk mains).
Determining adequate level
of data for more robust
models.
Utilities are typically
hesitant to be the first to try
out new technologies.
Different materials require
different approaches.
Difficult to obtain samples
without interruption of
service and destructive
testing.
89
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9.2 Conclusions and Recommendations
There is a growing range of rehabilitation technologies available for water mains. Many of these are
relatively new to the market and in the introductory stage of their life-cycle with the exception of CML,
which is a large and mature segment of the market. Several barriers and challenges still need to be
overcome and in doing so this will help to establish a market in which customers (owners and operators
of water supply networks) will have clearly defined needs and an equally clear understanding of
appropriate technologies that can meet those needs.
In order to overcome the barriers and challenges identified, it is recommended that innovative
rehabilitation technologies be demonstrated in field conditions and measured against a clearly defined set
of performance criteria. These demonstrations can inform water utilities of the capabilities, applicability,
and costs of innovative technologies. Demonstrations of innovative structural CIPP and semi-structural
polyurea lining have already been conducted under an EPA demonstration program (EPA, 2012a; 2012b)
and the results of the studies provide valuable resources to water utilities in need of actual installation,
performance, and cost information. An additional research need is identifying appropriate accelerated
aging test protocols that would help system owners to predict the long-term performance of the
rehabilitation products and technologies that are emerging in the market. A WaterRF project is underway
to study the use of CFRP for the repair of PCCP, but other technologies (e.g., pipe bursting or spray-on
lining for the rehabilitation of asbestos cement pipe) should be studied to identify appropriate design and
performance standards.
It is also recommended that a retrospective analysis of water main rehabilitation materials be conducted to
understand service life performance. Although water main rehabilitation is relatively new except for
CML, retrospective study of materials in use for up to 20 years or more can provide data on the
performance of field installed materials. These data can assist utility decision makers in selecting the
proper situation where these technologies and materials should be used in their systems. Decision-
support methodologies could also be developed to build an improved understanding of the condition of a
utility's networks and to assist with decision support for determining the most appropriate solutions.
These data along with the documented performance and applicability evaluation performed under a
demonstration program would be essential in providing utility decision makers with the information they
need for selecting appropriate technologies and materials to meet their system needs.
90
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Royer, M. 2005. "White Paper on Improvement of Structural Integrity Monitoring for Drinking Water
Mains," U.S. EPA, National Risk Management Research Laboratory, Washington, D.C.,
www.epa.gov/nrmrl/pubs/600r05038/600r05038.pdf
Selvakumar, A., R. Clark, and M. Sivaganesan. 2002. "Cost of Water Supply Distribution System
Rehabilitation." Journal of Water Resources Planning and Management, 128(4), 303-306.
Singley J., B. Baudley, P. Markey, D. DeBerry, J. Kidwell, and D. Malish. 1985. "Corrosion Prevention
and Control in Water Treatment and Supply Systems." Noyes Publication, Park Ridge, NJ.
Sterling, R. 2007. "Review if Test Data and Field Trials for the MainSaver Process." TTC Evaluation
Report No. TTC-2007.01, Ruston, LA.
Steward, E., E. Allouche, M. Baumert, and J. Gordon. 2009. "Testing of Rigid Polyurethane Spray-on
Lining under Internal Pressure." Pipelines, San Diego, CA, ASCE, Reston, VA.
Szeliga, M. 2007. "Analyses of Ductile Iron Corrosion Data from Operating Mains and Its Significance."
Pipelines, Boston, MA, ASCE, Reston, VA.
Thompson, D., S. Weddle, and W. Maddaus. 1992. "Water Utility Experience with Plastic Service
Lines." WaterRF Project No. 414, Denver, CO.
98
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U.S. Environmental Protection Agency (EPA). 2002. "The Clean Water and Drinking Water
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U.S. Environmental Protection Agency (EPA). 2005. "Drinking Water Infrastructure Needs Survey and
Assessment," U.S. EPA, Office of Water, Washington, D.C.
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forthe 21st Century, Research Plan." U.S. EPA, ORD, Washington, D.C.,
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Transmission and Distribution Systems. U.S. EPA, ORD, Edison, NJ.
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Edison, NJ.
U.S. Environmental Protection Agency (EPA). 2012b. Performance Evaluation of Innovative Cured-in-
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Warren, D., and S. Nance. 1997. "New York Aqueduct Rehabilitation." No-Dig Intl., 8(2), 12-13.
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99
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Quality of the Water." WRAS, Oakdale, UK.
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Water Research Center (WRc). 2010. Operational Requirements: In Situ Resin Lining of Water Main,
IGN 4-02-01. www.water.org.uk/home/member-services/wis-and-ign/archived-documents/wis-4-
02-01 -v3 —april-2010 .pdf.
Wrobel, G., M. Szymiczek, and L. Wierzbicki. 2004. "Swagelining as a Method of Pipelines
Rehabilitation." J. of Materials Processing Technology,Vol. 157-158, 637-642.
Zarghamee, M., R. Ojdrovic, and P. Nardini. 2011. "Pre-stressed Concrete Cylinder Pipe Condition
Assessment-What Works, What Doesn't, What's Next." WaterRF Project No. 4233, Denver, CO.
100
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APPENDIX A: TECHNOLOGY DATASHEETS
The datasheets that follow represent a useful collection of technology and product descriptions related to
the rehabilitation of water mains and service pipes in water distribution systems. Datasheets that were
prepared as part of the companion wastewater collection rehabilitation and force main rehabilitation
reports have also been included in this set where the product/technology has a clear applicability and/or a
stated market in the water distribution sector. Not all applicable products have been included in the
datasheets provided, since there may be many similar commercial offerings of a similar technology. In
general, datasheets from major or long-standing providers have been sought to represent each class of
product. The datasheet information was prepared initially by the research team from existing knowledge,
product brochures, and company Websites. The datasheets were then forwarded to the technology
provider for additional information and/or clarification. This process has resulted in some variation in the
quantity and quality of information available for each product. The authors hope that this will be a useful
compilation of information on the range of technologies available. Contact information has been
provided for the reader to access additional information, as needed.
A-l
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LIST OF DATASHEETS
Datasheet A-1.
Datasheet A-2.
Datasheet A-3.
Datasheet A-4.
Datasheet A-5.
Datasheet A-6.
Datasheet A-7.
Datasheet A-8.
Datasheet A-9.
Datasheet A-10
Datasheet A-11
Datasheet A-12
Datasheet A-13
Datasheet A-14
Datasheet A-15
Datasheet A-16
Datasheet A-17
Datasheet A-18
Datasheet A-19
Datasheet A-20
Datasheet A-21
Datasheet A-22
Datasheet A-23
Datasheet A-24
Datasheet A-25
Datasheet A-26
Datasheet A-27
Datasheet A-28
Datasheet A-29
Datasheet A-3 0
Datasheet A-31
Datasheet A-32
Datasheet A-3 3
Datasheet A-34
Datasheet A-3 5
Datasheet A-3 6
Datasheet A-3 7
Datasheet A-3 8
Datasheet A-3 9
Datasheet A-40
Datasheet A-41
Datasheet A-42
Datasheet A-43
3M™ Scotchkote™ 169 Polyurea Lining A-3
Acuro Polymeric Resin Lining A-5
AMEX®-10 Joint Seal A-7
Avanti AV Chemical Grouting A-9
Belzona® 58HDWEpoxy Coating A-ll
CarbonWrap™ Pipe Wrapping A-13
Cement Mortar Lining A-15
Clock Spring® Pipe Sleeve A-17
Freyssinet Frey-CWRAP® Pipe Wrapping A-19
. HOBAS® Segmental Sliplining A-21
HydraTech HydraTite® Joint Seal A-23
HydraTech WaterLine Epoxy Lining A-25
Insituform InsituGuard® Close-Fit Lining A-27
Insituform InsituMain® CIPP Lining A-29
Insituform PPL® CIPP Lining A-31
Insituform Thermopipe® Hose Lining A-33
LINK-PIPE Hydro-Seal™ Mechanical Sleeve A-35
MainSaver™ Composite Lining A-37
Miller Pipeline Weko-Seal® Joint Seal A-39
NordiTube NordiPipe™ CIPP Lining A-41
. NordiTube Tubetex™ CIPP Lining A-43
. Nu Flow Epoxy Coating A-45
. Pipe Wrap A+Wrap™ Pipe Wrapping A-47
Powercrete® PW Epoxy Coating A-49
Quake Wrap™ Pipe Wrapping A-51
Radlinger Primus Line ® Hose Lining A-53
RLS Solutions AquataPoxy® Epoxy Lining A-55
Sanexen Aqua-Pipe® CIPP Lining A-57
Sprayroq SprayShield Green® I Polyurethane Coating A-59
Sprayroq SprayWall® Polyurethane Coating A-61
Starline® CIPP Lining A-63
SubterraELC257-91 Epoxy Lining A-65
Subterra Fast-Line Plus™ Polyurethane Lining A-67
Subterra Rolldown Process A-69
Subterra Subcoil Hose Lining A-71
Subterra Subline Fold and Form A-73
Swagelining™ Reduced Diameter Pipe A-75
Tyfo® FibrWrap® Pipe Wrapping A-77
Underground Solutions Duraliner™ A-79
Underground Solutions Fusible PVC Continuous Sliplining A-81
United Pipeline Tite Liner® Reduced Diameter Pipe A-83
WavinNeofit Service Lining A-85
Aqualiner Melt-in-Place Pipe Lining A-87
A-2
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Datasheet A-l. 3M™ Scotchkote™ 169 Polyurea Lining
Technology/Method Scotchkote™ 169/Spray-On Polyurea Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name
Practitioners
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Formally known as Copon Hycote 169 and introduced in the UK in 1999.
About 6,000 miles have been lined, bulk of which is in UK.
3M Corrosion Protection Products Division
Austin, Texas 78726-9000
Phone:(512)984-5515
Email: gsnatwig@mmm . com
Web: www.3m.com
• Pierre Leblanc, Alltech Solutions, Canada
Email: leblanc@alltechsolutions.ca
• David Brown , Yorkshire Water UK
Email: david.brown(g),yorkshirewater.co.uk
• Les Metcalfe, South West Water UK
Email: lmetcalfe@southwestwater.co.uk
3M™ Scotchkote™ 169 is a two component Polyurea based coating
designed for use in water pipe rehabilitation applications. For pipe
application, the material is pumped to a remote spray head and is moisture
tolerant to provide high build, slump resistant coatings with adhesion
characteristics assuming a properly prepared surface. Finished coatings
are hard, glossy, and free of surface tack. The lining forms a barrier
coating and is an alternative to conventional pipe replacement methods.
• No large scale disruption and small carbon footprint
• Abrasion resistance
• Long term (design life of 50 years) corrosion protection material
• Equivalent to AWWA M28 Class I Rehabilitation technology
• Well suited for minimal local host pipe damage
• Not recommended for pipe with residual asset life less than 20 years
• Not recommended for use in PVC due to failure pattern in host pipe
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Oil, Gas, and Industrial pipelines
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Lining Rehabilitation of Water Mains
• Service connections are not normally blocked.
• If CCTV inspection shows a blocked service connection, it can be
repaired with a drill tool on the camera.
• Ultimate tensile strength is 25.0 MPa
• Flexural strength is 55.0 MPa
• Flexural Modulus is 3,200 MPa
• Hardness 85 Shore D
• (LC8 standards clearance)
Polyurea
• Base Component: White thixotropic liquid
• Activator Component: Black thixotropic liquid
• Mixed Material: Light Grey
• Mix ratio 2.5:1 base to activator
4 in. to 48 in.
A-3
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Technology/Method
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length
Other Notes
Scotchkote™ 169/Spray-On Polyurea Lining
• Maximum film thickness of 80 mils.
• Practical applications of 40 to 80 mils are specified.
Not Available
• To be stored in the original sealed containers at temperatures
between 0°C and 40°C.
• Applied when substrate/water temperatures are less than 3°C
• Material temperature at the application head is 25-35°C (75-95°F).
100 ft to 500 ft (typical installation lengths)
• Approved manufacturing facility is in North Yorkshire, UK
• Recommended deflection in pipe of up to 12°
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
• NSF/ANSI Standard 61 Certification
• DWI approved (UK)
• Approved under Regulation 3 l(4)(a) of the Water Supply
Regulations
• Norwegian, Spanish, and Polish approvals
Not Available
30 years (Some studies suggest 40 to 60 years).
Not Available
• Host pipe cleaning and drying are required.
• One coat 40 mils (1 mm) thick is applied in a single pass of the head.
• Coating should be allowed to cure for at least 60 minutes at ambient
temperature after lining before disinfection and flushing procedures.
• CCTV inspection of the coating may be carried out after a minimum
cure period of 10 minutes from completion of lining.
• One hour flush required prior to being placed into service.
• Disruption of around 10 hours if bypass water supply is not used.
Equipment needs special head and cleaning.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Using a maximum of 100 mg/litre of free chlorine
Leakage detection tests and recoating
V. Costs
Key Cost Factors
Case Study Costs
• Lining materials
• Spraying equipment
• Entry and exit access pits
• Time for installation
• Tarmac coating required at excavation pits
Not Available
VI. Data Sources
References
• http://solutions.3m.com/wps/portal/3M/en US/Corrosion/Protection/
Products/Cataloa2/?PC 7 RJH9U523001R40I49E2FVI20E3 nid=K
FJDBHV60QbeMD6XD483P9gl
• www.nsf.org
• International Pipelines Article (Najafi et al., 2009)
• Email correspondence with Gary Natwig
A-4
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Datasheet A-2. Acuro Polymeric Resin Lining
Technology/Method
Acuro Polymeric Resin/Spray-On Polyurea Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Introduced in 1999 in U.S., potable water since 2007
10 km+ lining applied to date
Acuro Inc.
2126, Principal Ave.
St-Zotique, QC, Canada JOP 1ZO
Phone: (450) 267-0747
5 1194 Romeo Plank
Macomb, MI 48042
Phone:(810)499-9318
Email: info@acuro.ca
Web: www.acuro.ca
• City of Vaudreuil-Dorion, Quebec
• City of Beauceville, Quebec
• City of Peterborough, ON
• City of Napanee, ON
• City of Cleveland, Ohio
Water main rehabilitation that is a NSF/ANSI Standard 61 compliant
fully-structural, semi -structural, and/or non-structural system.
• Restores hydraulic capacity
• Enhances pipe structure
• Stops leaks, breaks, and corrosion
• Designed to provide a non-, semi-, or fully-structural protection
• Same day return-to-service possible
• Current equipment unable to negotiate 90° bends
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length
Other Notes
Lining Rehabilitation of Water Mains
Need to be plugged or inspected and drilled open from inside the main
(normally do not need to be drilled).
Meets ASTM F-1216 structural requirements
Polymeric Resin
2 in. and up
3 mm and up
200+ psi (third-party testing)
Not Available
Up to 650 ft (200 m.) between access pits
• Used for AC, DI, CI, PVC, steel, clay, and previously coated pipes
• Hazen -Williams coefficient around 110
• Polymeric resin shows 10% elongation to help in-case of pipe breaks
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
NSF/ANSI Standard 61-5 approved by Truesdail Laboratories (not listed
on the NSF website)
Designed as per ASTM F-1216
50 years (75-100 years claimed)
A-5
-------
Technology/Method
Installation Standards
Installation Methodology
QA/QC
Acuro Polymeric Resin/Spray-On Polyurea Lining
With some changes to the Field operations Manual, mostly it is based on
the Code of Practice: In-situ Resin Lining of Water Mains from the UK
Water Industry, and AWWA M28 (currently working on new ASTM
Standard)
Following the cleaning and drying of the water main, the resin is spray-
formed to the host water main by use of a robotic sprayer and umbilical
cord. The polymeric resin is a thermoset material cure applied using
impingement mixing under hydraulic pressure within the tube. The liner
is continuous and tight fitted to the host structure. The liner consists of
one or more layers of applied liner to meet the level of rehabilitation
required (i.e., non-, semi-, or fully-structural). Curing begins in less than
10 seconds.
A structural assessment may take place to help determine the level of
rehabilitation required. A probe is inserted throughout the entire length of
the main using a pulling and transmission cable. All defects correspond
to a loss of material (pitting, corrosion) and reduce the attenuation and the
phase shift of the electromagnetic field. These variations are then used to
evaluate the volumetric importance and depth of the defects.
Disinfection as per AWWA standards, pressure and water tightness tests
and water samples for laboratory testing.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
An electromagnetic probe may be used to check for wall thickness loss.
Internal repair of any holes larger than 1/8 in. prior to spraying.
V. Costs
Key Cost Factors
Case Study Costs
• Polymeric resin materials
• Spraying equipment
• Entry and exit access pits
30% less expensive than CIPP lining in one of the cases
VI. Data Sources
References
• www.acuro.ca/eng/services/water-main-rehabilitation.html
• Brochure from No-Dig 2009
• ACURO Specifications
• Email correspondence with Stephane Joseph
A-6
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Datasheet A-3. AMEX®-10 Joint Seal
Technology/Method Amex®-10/Internal Joint Seal
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1970s in Germany
Over 1.3 million units worldwide
AMEX GmbH
Rondenbarg 16
Hamburg, Germany 22525
Phone: +49 (405) 590-0199
Email: info@amex- 1 0 . de
Web: www.amex-10.de
Not Available
AMEX-10 profiles are produced in endless sections and are joined
together to any required size by a special production method. The
physical characteristics, resistance, and special shape with its three fold
seal between the main seal, ensure a permanent seal in the pipe. The
special elastic quality of various rubber types with the ability to bridge
axial and radial displacements without influencing the sealing properties
is the basis for a permanent sealing function reached by radial tension via
the retaining bands, which are manually installed without the use of a
robot or adhesives.
• For circular, elliptical, egg shape, mouth, and cornered profiles
• By variable shaping any installation length can be realized
• Absolute sealing caused by gearing
• Bypass pumping required
• Applicable for accessible pipes only or end of non-accessible pipes
• Very rough surfaces have to be treated with a coating
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length
Other Notes
Spot Repair with Internal Joint Seals
Not applicable
Not-structural
• Medium density PE (MDPE) backing
• SS retaining bands
• EPDM rubber
20 in. to 230 in. (500 mm to 5800 mm) accessible pipes
10 in. to 20 in. (250 mm to 500 mm) non-accessible pipe ends
Not Available
Up to 290 psi (20 bar)
14°F to 212°F (-10°C to over 100°C)
Spot repair technology, seal is 10 in. long
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
• Complies with NSF/ANSI Standard 6 1 (not listed on the NSF
website)
• German Institute for Standardization EN 68 1-1 2003 - 05
• KTW - Recommendation 1.3.13
A-7
-------
Technology/Method
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Amex®-10/Internal Joint Seal
Not Available
50 years
As per manufacturer's guidelines
• All pollution has to be removed mechanically in such a way that a
clean and smooth surface exists. In case of depressions of the pipe
wall, a suitable material has to be applied to reach a smooth surface.
• Put in the pipe and transported together with the retaining bands to
the place of installation.
• Placed exactly onto the clean and smooth pipe surface and adjusted.
• Set up of the seal is completed by the two retaining bands.
• After the hydraulic expander has been fitted to the retaining bands a
slight press on follows. (Correct fitting of the seal and the retaining
bands has to be controlled).
• Installation of the safety spindle for bracing follows.
• By slow activation of the hydraulic pump and hammering
simultaneously onto the retaining bands the pressure is slowly
increased until the pressure gauge does not show a loss of pressure.
• In order to guarantee an optimal installation it is necessary,
depending on the pipe material, to after-pressure the seal once.
• The perfect fit and tightness of the seal can be tested by putting
pressure through a super flat test valve to the seal.
• After having inflated the seal a leak detecting spray is applied to the
end wall of the seal in order to detect escaping air.
• For leaking joints, temporary sealing of the joint is required.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Seals and equipment
• Mobilization
• Entry access pits
• Cleaning
• Surface restoration
Not Available
VI. Data Sources
References
• www.amex-10.de/en/pdf/AMEX Imagebroschuere en.pdf
A-8
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Datasheet A-4. Avanti AV Chemical Grouting
Technology/Method Avanti AV-202, AV-330 and AV-333/Chemical Grouting
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
2005 for potable water use
• Approximately 500,000 Ibs/yr of AV-202
• Approximately 125,000 Ibs/yr of AV-333.
Avanti International
822 Bay Star Blvd.
Webster, TX 77598
Phone: (800) 877-2570
Fax:(281)486-5600
Email: j im. gentry (giavantigrout.com
Web: www.avantigrout.com
Concrete repair and waterproofing contractors.
AV-202, AV-330, and AV-333 multigrouts are polymer solutions that
cure when reacted with water. It reacts freely with water to form a strong
film, gel, or foam of PU. Its intended use would be to prevent water
infiltration into sub-grade structures and pipes.
• Durable elastic foam or gel
• Used for heavy or light flow conditions, as well as under water
• Nonflammable
• Bypass pumping required
• Requires man-entry
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Dams and Reservoirs
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair with Chemical Grout
Not applicable
Not-structural
Prepolymer urethane resin grout
• 1 in. and up (externally)
• 24 in. and up (internally)
Not Available
Not Available
40°F to 200°F
Spot repair technology, can be used in as many locations as needed
The primary difference in the two products is the viscosity, with AV-202
having a viscosity of approximately 2,500 cps and AV-333 having a
viscosity of approximately 450 cps. The more viscous material would be
used in larger cracks.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
NSF/ANSI Standard 61 approved by UL (not listed on the NSF website)
ASTM D-93 and ASTM D-3574
25 years
As per manufacturer's guidelines
• Clean the crack or joint to be sealed of any loose foreign material.
• Cut oakum in sizes to meet the requirements of the cracks and holes.
• Place the oakum in a heavy-duty plastic bag or pail.
A-9
-------
Technology/Method
QA/QC
Avanti AV-202, AV-330 and AV-333/Chemical Grouting
• Pour the product into the plastic bag or pail. Pour enough to cover
the oakum. Let the oakum soak long enough to get thoroughly
saturated with the chemical grout. The appropriate protective
equipment and ventilation should be used.
• Take the saturated oakum out of the container and submerse in water
for approximately 5 to 10 seconds. Then hold the oakum out of
water until the grout starts to foam (approximately 5 to 10 seconds).
• Place the oakum into the leaking crack, joint, or hole. Use a blunt
instrument, such as a screwdriver, to drive the oakum further into the
leaking area (joint). The water in the joint will continue to activate
the grout that has been absorbed by the oakum.
Manufacturer's QA/QC procedures plus UL certification each year.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Grout and equipment
• Mobilization
• Entry access pits
• Cleaning
• Surface restoration
Not Available
VI. Data Sources
References
• www.avantigrout.com/202sum.html
• Email correspondence with Jim Gentry
A-10
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Datasheet A-5. Belzona® 5811DW Epoxy Coating
Technology/Method Belzona® 5811DW/Spray-On Epoxy Coating
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
2007
Not Available
Belzona, Inc.
2000 N.W. 88th Court
Miami, FL 33 172
Phone: (305) 594-4994
Fax:(305)599-1140
Toll Free: (800) 238-3280
Email: belzona@belzona.com
Web: www.belzona.com
Not Available
Belzona® 581 1DW is a two-component system applied by brush or spray
for protection of metallic and non-metallic surfaces operating under
immersion conditions in contact with aqueous solutions and aggressive
chemicals.
• Provides protection from the effects of salt water, acid, alkali,
alcohol, hydrocarbon, and the environment
• Long lasting and economically sound system
• Repair and seal pipe expansion bellows
• Repair existing linings
• Repair leaking pipes
• Requires up to 5 days for full cure
• Requires man-entry
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair Coating of Water Mains
Connections may have to be plugged or handled separately.
Not Available
2 Component, Solvent-Free Epoxy
36 in. and up
20 mils (maximum film thickness)
Not Available
• 50°F (use within 2 hrs)
• 77°F (use within 1 hr)
• 86°F (use within 30 mins)
Limited by length of hose if spray applied
Final curing time is 5 days and at 68°F temperature. A re-coat cure
is for 6 to 8 hrs at 68°F temperature for a maximum of 72 hrs.
time
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
NSF/ANSI Standard 61 Certification
ASTM D-695, ASTM D-790, ASTM D-1002, ASTM D-2240, ASTM D-
4541, andNACE TMO 174-2002
Not Available
As per manufactures' guidelines
A-ll
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Technology/Method
Installation Methodology
QA/QC
Belzona® 5811DW/Spray-On Epoxy Coating
The epoxy coating is applied by spraying 2 coats, each having a mix ratio
of Part A to Part B at 3 to 1 by volume.
As per manufacturers' guidelines
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection as per AWWA standards when used in potable water pipes.
The coating can be reapplied over rehabilitated sections.
V. Costs
Key Cost Factors
Case Study Costs
• Epoxy materials
• Entry and exit access pits
• Duration of cure time
Not Available
VI. Data Sources
References
• www.belzona.com/prod5k.aspx
• Belzona Press Release: "Belzona, Inc. Coating NSF Approved
Drinking Water System Components"
• Product Flyer: Belzona® 5811 DW
for
A-12
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Datasheet A-6. CarbonWrap™ Pipe Wrapping
Technology/Method CarbonWrap™/Pipe Wrapping
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Invented in 1987, available in the market since 1994.
Over 100,000 If of pipe have been wrapped.
CarbonWrap™ Solutions LLC
2820 E. Fort Lowell Rd.
Tucson, Arizona 85716
Phone:(520)292-3109
Fax: (520) 408-5274
Toll Free: (866) 380-1269
Email: info@carbonwrapsolutions .com
Web: www.carbonwrapsolutions.com
• Strengthening of underground concrete pipes in Phoenix, AZ
• Strengthening of underground concrete pipes in Tucson, AZ
CarbonWrap™ is an effective and economical application for
strengthening buried pipes. Concrete and steel pipes can be strengthened
to take pressures even greater than that of their original design value.
• Requires no excavation
• Increases pipe strength to higher than its original pressure rating
• Creates a smooth surface and improves pipe flow
• Requires no heavy equipment for installation
• Requires man-entry if used internally
• Requires excavation if used externally
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair of Water Mains
Can be cut to fit around services
Structural material
Epoxy and carbon
36 in. and up if used internally and any size if used externally
1/8 in. thick
Increases pipe strength to higher than original pressure rating (claimed)
Application in humid temperature is not recommended
No limitation, limited by access only
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Meets NSF/ANSI Standard 61 (not listed on the NSF website)
ASTM D-638, ASTM D-3039, and ACI 440
Minimum 25 years
As per manufacturer guidelines
In the case of 3 ft and larger diameter pipes operations are conducted
internally. If the pipe can be accessed from the outside, the wrapping can
be installed on the outside face of the pipe; resulting in the same benefits.
It is generally applied in the following format: Epoxy-fiber-epoxy-fiber.
Not Available
IV. Operation and Maintenance Requirements
A-13
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Technology/Method
O&M Needs
Repair Requirements for
Rehabilitated Sections
CarbonWrap™/Pipe Wrapping
Regular cleaning is required. Maintenance strategies should include
condition assessment measures.
Relining may be done.
V. Costs
Key Cost Factors
Case Study Costs
• The composite material is generally the key governing factor
• Site accessibility and pipe condition determine the amounts
Material cost at $10 to $15/sf
VI. Data Sources
References
• www.carbonwrapsolutions.com/PDFinfo/Brochure.pdf
• Phone and email correspondence with Dr. Hamid Saadatmanesh.
• Email correspondence with Faro Mehr.
A-14
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Datasheet A-7. Cement Mortar Lining
Technology/Method
Cleaning and Cement Mortar Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1930s
Thousands of miles in the U.S.
J. Fletcher Creamer & Son, Inc.
101 East Broadway
Hackensack, New Jersey 0760 1
Phone:(201)488-9800
Fax:(201)488-2901
Email: info(®ifcson.com
Web: www .j fcson . com
Mainlining Service, Inc.
P.O. Box 96
Elma, New York 14059
Phone: (716) 652-3700
Email: rehab@mainlining .com
Web: www.mainlining.com
• Macon-Bibb Water Authority, Macon , Georgia
Lined over 200,000 If of 6 in. to 36 in. CI pipe at various locations.
• Los Angeles Department of Water and Power, California
Cleaned and lined over 3,000,000 If of 4 in. to 60 in. CI and steel
water mains on numerous projects.
• New Jersey American Water, Haddon Heights, New Jersey
Cleaned and lined over 250,000 If of 4 in. to 20 in. water lines.
In-place cleaning and cement mortar lining restores flow, eliminates red
water complaints, and it's all done without removing the pipe from the
ground and without interruption of water service to the customer. There
are large excavations and no disruption of traffic or business operations.
• Less local area inconvenience
• Savings in pumping costs
• Extends system life
• Eliminates red water
• Increases pressure and fire flow
• Improves water quality
• Surfaces must be very clean
• Cannot negotiate sharp bends
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Storm Water Lines
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Thickness Range
Pressure Capacity, psi
Lining Rehabilitation of Water Mains
Need to be free of debris and mortar or reinstatement is required
Not a structural solution
1:1 mixture of Portland cement, well-graded silica sand, and water added
4 in. and up
6 mm to 13 mm
Depends in the diameter
A-15
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Technology/Method
Temperature Range, °F
Renewal Length
Other Notes
Cleaning and Cement Mortar Lining
Not Available
Up to 750 ft, limited by the length of the spray hose
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
AWWAC104
50 years
AWWA C602
• While excavations are being made to prepare for cleaning and lining
operations, temporary bypass pipe is installed along the curb line on
both sides of the street.
• Before lining, the pipe interior must be cleaned either hydraulically
(a steel frame with protruding metal scraper blades is propelled
through the pipeline by water pressure) or mechanically (the cleaning
scrapers are pulled through the pipe by a winch and water is used to
flush debris out of the pipe opening).
• The premixed cement mortar lining is centrifugally applied to the
pipe wall interior using mortar application equipment. As the mortar
lining is applied, a flexible troweling device follows behind to
produce a smooth, hydraulically efficient surface.
AWWA C602
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Coating can be resprayed over the problem area.
V. Costs
Key Cost Factors
Case Study Costs
• Cement mortar materials
• Entry and exit access pits
• Bypass system
• Cleaning and inspection
• Surface restoration
Not Available
VI. Data Sources
References
• www.jfcson.com
• www.mainlining.com
• www.eDa.aov/nrmrl/Dubs/600ia02406/600ia02406.Ddf
A-16
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Datasheet A-8. Clock Spring® Pipe Sleeve
Technology/Method Clock Spring®/Pipe Sleeve
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1993
Over 250,000 units installed in over 75 countries
Clock Spring Company, L.P.
14107InterdriveWest
Houston, TX 77032
Phone:(281)590-8491
Fax:(281)590-9528
Email: salesi®clockspring.com
Web: www.clockspring.com
• Conoco Phillips
• British Petroleum
• Enterprise Products
• Koch
• Duke Energy
Clock Spring® is an economical repair alternative for pipelines. The
repair is comprised of 8 wraps of composite, a high-strength filler
material, and the adhesive. The individual wraps of the repair are bonded
together, and to the pipe surface to restore serviceability. It can be used
to permanently repair external blunt metal loss defects with a depth of
less than 80% of the nominal wall thickness.
• High strength and corrosion resistant
• Fast repairs
• No release of greenhouse gases
• No waste disposal issues
• Only used for external repairs
• Requires excavation for installation
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length
Other Notes
Spot Repair with External Pipe Sleeve
Not applicable
Not-structural
• E-glass and polyester resin composite sleeve
• Adhesive and filler
4 in. to 56 in.
!/2 in.
Shares the load with the host pipe
• 0°F to 170°F (-18°C to 77°C) for application
• -20°F to 1 70°F (-29°C to 77°C) for service
Spot repair technology, sleeve width of 1 1.5 +/- 0.5 in.
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
NotNSF/ANSI Standard 61 Certified
Long-term accelerated laboratory testing and evaluations of long-term
field installations results in the aged material properties.
A-17
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Technology/Method
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Clock Spring®/Pipe Sleeve
50 years
As per manufacturer's guidelines
• The missing or damaged wall is replaced by filling the volume with
a proprietary compound that transfers the structural load from the
defect to the glass fibers reinforcement.
• The sleeve is then wrapped around the pipe while applying the
viscous adhesive between each layer.
• During installation, the adhesive acts as a lubricant between the
composite layers, allowing them to be cinched tightly to the pipe.
• During cinching, the excess adhesive/filler is distributed, filling
voids and tented areas - and is squeezed out the sides of the
composite.
Documentation of the system is in the form of a controlled QA Manual
and controlled work instructions/procedures providing sufficient detail to
demonstrate compliance to requirements and allow evaluation of results.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Allowable repairs based on specific codes, such as ASME B31.4 or
B31.8.
NACE 3 surface preparation
V. Costs
Key Cost Factors
Case Study Costs
• Sleeves and equipment
• Mobilization
• Access pits
• Surface restoration
Not Available
VI. Data Sources
References
• www.clocksprins.com/PDF/ClockSprinspiperepairsvstempdf.pdf
• Email correspondence with Buddy Powers
A-18
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Datasheet A-9. Freyssinet Frey-CWRAP® Pipe Wrapping
Technology/Method Freyssinet Frey-CWRAP®/Pipe Wrapping
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Innovative
Product is ready to be commercialized
Not Applicable
Freyssinet LLC.
44880 Falcon Place, Suite 100
Sterling, VA, 20166
Phone: (703) 378-2500
Fax: (703) 378-2700
Email : frevssinet^frevssinetusa.com
Web: www.frevssinetusa.com
• 96 in. diameter pipe repair in Potomac, MD
• 84 in. diameter pipe repair in Tucson, AZ
Reinforcement by CFRP lining is a promising technology for pipe repair
and Freyssinet has developed FREY-CWRAP®: a carbon fiber/epoxy
resin composite specifically designed for application on PCCP surfaces.
Used to ensure there is no delamination due to internal pressure.
Complete water tightness is guaranteed. It is a primary solution to
corrosion in PCCP pipes. It can also handle premature failing due to
hydrogen brittleness, corrosion of the liner initiating from inside the pipe,
and leakage due to defects or differential settlement. It uses a FREY-
CWRAP® robot making it an industrialized and automated pipe relining.
• Limited to sectional repairs
• Requires man-entry
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Mainly PCCP pipes
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Composite Lining/Spot Repair of Water Mains
Need to be plugged.
Not Available
Carbon Fiber Reinforced Polymer
60 in. to 120 in.
20 to 27 mils
290 psi
3°C above dew-point, generally ambient temperature is acceptable.
Full length or spot repair (joints can be bridged by NSF approved glass-
fiber based products
• Freyssinet has also developed a PCCP external durable pre-grouted
PT system called DURALOOP®.
• Based on the use of the patented 2MX15 anchorage and special
indented strand centering external HDPE/PP sheathing to achieve a
fully encapsulated and durable post-tensioning system.
• Pre-grouting of the centralized strands prior to stressing provides
uniform support of the unbonded monostrands, thus ensuring that the
corrosion protection system remains intact.
III. Technology Design, Installation, and QA/QC Information
Product Standards
NSF/ANSI Standard 61 Certification
A-19
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Technology/Method
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Freyssinet Frey-CWRAP®/Pipe Wrapping
ASTM D-3039
50 years
As per manufacturer's installation manual
• Pipeline is dewatered.
• Defects and delaminated concrete surfaces repaired with Foreva.
• Inner surface is dried.
• Robot is introduced in the pipeline through normal entry points.
• It is assembled and loaded with carbon fabric rolls and resin barrels.
• Initially a layer of Epanol Resin 385 is coated followed by 1 1 coats
of Resin 382 and Resin 385 such that the last coat is Resin 385,
which seals the edges.
• Curing time is done at ambient temperature within 2 hours.
• Final coat has a cure time of 15 days at ambient temperature. If a
second coat is applied, it shall be cured for 7 days.
• Bond tests are performed to check the bond strength of 2 MPa.
• Ensure a minimum overlapping of 600 mm.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
The system shall be disinfected in accordance with local standards.
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Distance from repair location to surface access
• Wrapping materials
• Quantity of lineal feet to be rehabilitate
• Cleaning and inspection
Not Available
VI. Data Sources
References
• www.frevssinetusa.com/pdfs/brochuresAVATER%20CIVIL%20EN
GINEERING%20STRUCTURES%20-%20Foreva.pdf
• www.frevssinetusa.com/projects.html#pipe
Brochure provided by Freyssinet USA
• Email correspondence with Dominique Deschamps and Gregoire
Jeanson
A-20
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Datasheet A-10. HOBAS® Segmental Sliplining
Technology/Method HOBAS®/Segmental Sliplining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
NSF/ANSI Standard 61 potable water approval in 1998
• Sliplining (all applications) -1,200,000 ft since 1987
• Less than 5,000 ft for potable water
Hobas Pipe USA, Inc.
1413RicheyRd.
Houston, Texas 77073
Phone:(281)821-2200
Fax:(281)821-7715
Toll Free: (800) 856-7473
Email: info(®hobaspipe.com
Website: www.hobaspipe.com
• New Orleans, Louisiana, Boh Brothers Construction
Sliplining of 1,000 ft of 36 in., 125 psi pressure, 46 psi stiffness class
pipe into a 48 in. CI main that was nearly 100 years old.
• McAllen-Miller International Airport, McAllen, Texas
Sliplining of 1,090 ft of 63 in. pipe in concrete pipe under a runway.
HOBAS pipes are centrifugally cast, fiberglass reinforced, polymer
mortar (CCFRPM). They are strong, light, and inherently corrosion
resistant with consistent dimensions, smooth surfaces and high stiffness.
• Long, maintenance-free life and corrosion resistance.
• Leak-free, quick assembly, gasket-sealed, push-together joints
• Low head loss experienced from the smooth inner surface
• 20 ft sections and push-together joints (no welding or chemicals).
• Field length adjustments with gasket-sealed coupling joints that seal
anywhere along the natural pipe OD surface with no calibration.
• Cannot push through bends over: 3° (for 1 8 in.), 2° (for 27 in.), 1 .5°
(for 36 in.), and 1° (for 54 in.) (elbows required at these locations).
• Requires excavation at each service for reinstatement
• Reduces the inner diameter (ID) although the smooth wall typically
improves flow
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Culverts
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Sliplining Rehabilitation of Water Mains
Reinstate with excavation
Fully structural with grouted annulus
• Centrifugal cast fiberglass reinforced polymer mortar wall
• Final interior layer is epoxy resin in addition to the normal polyester
layer (for potable water applications only)
18 in. to 110 in.
0.35 in. to 4 in.
50 psi to 250 psi
Up to 150°F suitable (NSF potable water approval for cold water only)
Typical length up to 1,000 ft
Stiffness Classes - 36, 46, and 72 psi standard, although others, in-
A-21
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Technology/Method
HOBAS®/Segmental Sliplining
between and higher, are available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
• NSF/ANSI Standard 61 Certification
• AWWA C950, Fiberglass Pressure Pipe Standard
• Chapter 5 of the AWWA Fiberglass Pipe Design Manual, M45
• ASTM D-638, ASTM D-790, ASTM D-1599, ASTM D-2290,
ASTM D-2412, ASTM D-2583, ASTM D-2584, ASTM D-2992,
ASTM D-3567, and ASTM D-3681
100 years
As per manufacturer's guidelines
• Liner pipes are pushed into the existing pipe with the pipes being
inserted spigot end first with the bell end trailing.
• Sometimes the leading pipe spigot end is protected by a nose piece
designed to ride-up and over off-set joints and other minor
inconsistencies or debris in the invert.
• The pushing force must be applied to the pipe wall end inside of the
bell (do not apply the pushing load to the end of the bell and assure
that safe jacking loads are not exceeded).
• Laterals may be typically reconnected to the new liner pipe using
"Inserta Tees" or similar accessories.
• Grout the annular space between the OD of the liner pipe and the ID
of the existing pipe with a cement or chemical based grout.
• During grout placement, assure that the safe grouting pressure is not
exceeded and that the grout density and lift heights are coordinated
to control the liner pipe flotation and deformation to within
allowable limits.
Standard quality control tests are defined in AWWA C950. However, it
is not standard to factory hydrotest HOBAS pressure pipes due to their
seamless, solid wall, non-porous, monolithic cast construction.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Cut out and replace with pipe of the same OD, using repair clamps and all
standard fittings.
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Entry and exit access pits
• Cleaning and inspection
• Service reconnection
Not Available
VI. Data Sources
References
• www.hobaspipe.com
• Email correspondence with Rick Turkopp
A-22
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Datasheet A-ll. HydraTech HydraTite® Joint Seal
Technology/Method HydraTech HydraTite®/Internal Joint Seal
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1995
Over 7,500 seals installed
HrdraTech Engineered Products, LLC
10448 Chester Rd.
Cincinnati, Ohio 45215
Phone:(513)827-9169
Fax (5 13) 827-9171
Email: info(®hvdratechllc.com
Web: www.hydratechllc.com
Various municipalities and DOT's. Installed by a network of certified
contractors specializing in trenchless technology repairs.
HydraTite® is an internal sealing system that offers customized
mechanical remediation for pipe joint repairs without excavation featuring
rapid installation and return-to-service.
• A mechanical, trenchless remediation for repair of pipe j oints
• Each seal is designed and custom made for each application to
ensure complete compliance with project specifications
• Low profile ensures minimal flow loss
• Patented interlocking design for lining long lengths of pipe.
• Non-corrosive components
• Bypass pumping required
• Applicable for accessible pipes only
• Smaller pipes down to 18 in. are subject to location of repair with
respect to access point.
• Installed by fully trained application specialists
• Pipes must be in a condition to accommodate pressures exerted
during expansion of retaining bands.
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas and Power
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair with Internal Joint Seals
Not applicable
Not-structural
• Proprietary rubber seal (EPDM for water)
• Stainless steel retaining bands
18 in. to 218 in.
• EPDM rubber is 0.6 in. ( non-compressed state )
• Retaining bands range from 1/8 in. to 3/8 in. depending on pipe size
Up to 300 psi
Up to 250°F
Spot repair technology, although seals can be interlocked to any length
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
NSF/ANSI Standard 61 Certification
AWWA M28, ASTM D-395, ASTM D-412, ASTM D-573, and AWS
A-23
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Technology/Method
Design Life Range
Installation Standards
Installation Methodology
QA/QC
HydraTech HydraTite®/Internal Joint Seal
Dl.l
50 years
As per manufacturer's guidelines
• The system consists of a proprietary rubber seal that spans the joint
and is held in place by stainless steel retaining bands in either side of
the joint, which must be repaired and cleaned.
• These retaining bands are expanded and locked in place using a
wedge lock design which forms an air tight clamp around the joint
eliminating all infiltration and exfiltration.
In order to guarantee an optimal installation it is necessary pressure test
the seals to check for leaks.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Maintenance free
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Seals and equipment
• Mobilization
• Entry access pits
• Cleaning
• Surface restoration
Not Available
VI. Data Sources
References
• www.nsf.org
• www.hvdratechllc.com/hvdratite .html
• www.hvdratechllc.com/tds/hvdratite tds2.html
• Email correspondence with Mike Fox
A-24
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Datasheet A-12. HydraTech WaterLine Epoxy Lining
Technology/Method HydraTech WaterLine/Spray-On Epoxy Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Innovative
1993 in the U.K.
More than 500,000 If (95 miles) since 2005 (reported by one contractor)
HrdraTech Engineered Products, LLC
10448 Chester Rd.
Cincinnati, Ohio 45215
Phone:(513)827-9169
Fax (5 13) 827-9171
Email: info(®hvdratechllc.com
Web: www.hydratechllc.com
• AMEC Utilities, UK
• Heitkamp Inc.
• Atlantic Underground Services Ltd.
WaterLine can be remotely applied in small diameter pipe or installed in
potable water vessels. This remote installation allows for the trenchless
remediation of pipe down to 4 in. in diameter with minimal out of service
time.
• A high-build, fat-curing, solvent free epoxy lining system.
• Compatible with a variety of substrates.
• Return to service in 16 hours
• Surfaces must be sound and free from grease, dust and all moisture
• Requires fully trained application specialists.
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Storage Tanks
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Lining Rehabilitation of Water Mains
Need to be plugged
• Tensile Strength (MPa) 22.26
• Elongation at Yield (%) 1.18
• Young's Modulus (MPa) 1,814
• Compressive Yield Strength (MPa) 1 18.67
• Flexural Strength (MPa) 38.21
• Coating to Concrete Bond Strength (N) 3,3 16
• Coating to Metal Bond Strength (N) 2,808
Epoxy: 2 parts Base , 1 Part Hardener by volume
4 in. and up
Wet and dry film thickness of 40 mils
Depends on hole size, from 70 up to 650 psi (5 to 45 bar, burst pressure )
• Minimum application temperature 40°F (3°C)
• Flash point above 212°F (100° C)
Limited by the length of the spray hose
• Storage life 12 months when stored in original sealed containers,
between 50-77°F (10°-25°C)
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
NSF/ANSI Standard 61 Certification
AWWA M28 and Deb et al., 2006
A-25
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Technology/Method
Design Life Range
Installation Standards
Installation Methodology
QA/QC
HydraTech WaterLine/Spray-On Epoxy Lining
50 years
In accordance with manufacturer's recommendations
• All surfaces must be clean, dry and sound.
• Coating should not take place if: (1) the temperature is below 40°F
(3°C); (2) the relative humidity exceeds 85%; (3) on steel substrate
temperature is less than 5°F (3°C) above the dew point; (4) on
concrete the substrate has a moisture content greater than 50%
• During application, regular wet film thickness readings must be
taken to ensure the required dry film is obtained.
• Due to the chemical cure of the materials, they must be thoroughly
mixed. The system must be allowed to cure for 16 hours prior to
being placed back in service or commissioned.
A clear spark test is recommended on conductive substrates.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Allow a minimum of 6 hours (maximum 48 hrs) before over coating if
patch repair is required.
V. Costs
Key Cost Factors
Case Study Costs
• Epoxy materials
• Entry and exit access pits
• Cleaning and inspection
Not Available
VI. Data Sources
References
• www.nsf.org
• www.hvdratechllc.com/waterline .html
• Email correspondence with Mike Fox
• Waterline epoxy pressure data
A-26
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Datasheet A-13. Insituform InsituGuard® Close-Fit Lining
Technology/Method Insituform InsituGuard®/Fold and Form/Reduced Diameter Pipe
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
Introduced in the U.S. is 2001
Approximately 6 miles for potable water applications
Insituform Technologies, Inc.
17999 Edison Avenue
Chesterfield, MO 63005
Phone: (636) 530-8000
Fax:(636)519-8744
Email: drosenberg@insituform.com
Web: www.insituform.com
• 1,000 ft of 19 in. to 24 in.
Steven Tusler, City of Colorado Springs, (719) 668-8537
• 19,000 ft of 30 in.
Dick Fett, IMC Agrico Company, Mulberry, Florida, (863) 648-9990
• 3,700 ft of 36 in.
Howard Wellspring, City of Baytown, TX, (713) 424-5508
• 10,000 ft of 48 in.
Madison Ave., City of New York
Inserted into an existing pipeline, the PE liner is continuous, and
installed with a close-fit against the inner wall of the host pipe. The liner
isolates the flow stream from the host pipe wall, eliminating internal
corrosion. The liner stops leaks, and can provide a fully structural
solution and increases flow capacity in some cases. Can be installed via
the fold and form process or symmetrically reduced diameter process.
• Negotiates sweeping bends
• Utilizes PE 80 (3408) and high-performance PE 100 (4710)
• Minimizes disruption
• Cannot do factory bends
• Bypass required
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Fold and Form or Reduced Diameter Pipe Rehabilitation of Water Mains
Service Connections have to be excavated.
Class III or IV depending upon diameter, pressure, and pipe condition.
4710(PE 100) is preferred.
12 in. to 48 in. Folded or 6 in. to 10 in. Flexed
Dimension ratio (DR) 17 or thinner
• Up to 150 psi for Class III
• Class IV dependent upon DR.
140°F
Up to 2,000 ft depending on winching capacity.
Pipes may be cleaned, as needed, with high-pressure water jet cleaners,
mechanically powered equipment, and winch cable attached devices or
fluid-propelled pig devices.
III. Technology Design, Installation, and QA/QC Information
A-27
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Technology/Method
Product Standards
Design Standards
Design Life Range
Installation Methodology
QA/QC
Insituform InsituGuard®/Fold and Form/Reduced Diameter Pipe
NSF/ANSI Standard 61 Certification
• Class IV design based on AWWA/PPI design standards.
• Class III interactive design based on industry accepted design.
50 years
• Excavations are made for access and removal of existing fittings.
• Sections of PE pipe are fused into lengths suitable for installation;
this can be the entire length, or shorter segments to accommodate
available work space. If shorter segments are used, they will be
fused together prior to entering the folding machine.
• The fused pipe is pushed through the folding machine or roller box,
which alters the shape of the pipe, resulting in a diameter reduction
of up to 40% of the cross-sectional area which is maintained by
banding the folded pipe.
• The liner is inserted into the host pipe.
• Once the liner is in place, it is pressurized with water to break the
bands and re-round the liner.
• The liner is cut to length and all end and intermediate connections
are installed using fused or mechanical fittings.
• The completed line is pressure tested, disinfected and returned to
service. Access points are backfilled and reinstated.
• Prior to installation, CCTV inspection of the main is needed to locate
any obstructions, protrusion, changes in diameter or in-line valves
that could affect the liner.
• After installation, the liner is inspected again visually with CCTV,
and any abnormalities are noted.
• For the post-installation pressure test, an internal pressure equal to
twice the known operating pressure, or operating pressure plus 50
psi, whichever is less is applied to the liner.
• After a stabilization period, the test period is one hour. Limit on
make-up water to maintain pressure is 20 gallons per inch diameter
per mile of pipe per day.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
The system shall be disinfected in accordance with local standards.
Excavate, remove the damaged portion of the liner and host pipe (if
necessary), install end couplers and bridge the previously damaged
location with new pipe and couplers as required.
V. Costs
Key Cost Factors
Case Study Costs
• Pipe Material
• Installation Equipment
• Entry and exit access pits
Not Available
VI. Data Sources
References
• www .insituform . com/mm/files/InsituGuard-UK .pdf
• www.insituform.com/content/309/insituauard — pressure-pipe. aspx
• Email correspondence with David Rosenberg
A-28
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Datasheet A-14. Insituform InsituMain® CIPP Lining
Technology/Method
Insituform InsituMain®/CIPP
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Innovative
Introduced in the U.S. in early 2009
Approximately 25,000 ft installed for potable water
Insituform Technologies, Inc.
17999 Edison Avenue
Chesterfield, MO 63005
Phone: (636) 530-8000
Fax:(636)519-8010
Email: drosenberg@insituform.com
Web: www.insituform.com
• City of Rochester, Minnesota
• Missouri American Water, St. Louis, Missouri
• Kansas City, Missouri
• Naperville, Illinois
• AWWA Class IV fully structural pressure rated CIPP technology.
• Applicable for both distribution and transmission water mains.
• No risk of disrupting or damaging nearby utilities or other
underground infrastructure systems.
• Has a PE layer on the inside pipe surface that increases smoothness,
reduces surface friction, and provides an additional corrosion barrier
• Can withstand internal pressure and external load requirements
• Eliminates leakage and corrosion
• Adheres to the existing host pipe
• No need for specialty fittings
• Bypass required
• Cannot negotiate 90° bends
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Industrial Pressure and Fire
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
CIPP Lining Rehabilitation of Water Mains
• No specialty fittings required.
• In 6 in. and larger pipes service connections can be made by robotic
remote access using mechanical sealing apparatus.
Exceeds ASTM F- 12 16 and ASTM F-1743 standards
Epoxy composite layer reinforced with glass and polyester fiber materials
6 in. to 60 in.
% in. (7.5 mm)
150 psi
Up to 120°F
200 ft to 400 ft (typically)
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
NSF/ANSI Standard 61 Certification
ASTM F- 12 16 and ASTM F-1743
50 years
A-29
-------
Technology/Method
Installation Standards
Installation Methodology
QA/QC
Insituform InsituMain®/CIPP
In accordance with manufacturer's operation manual.
• Composite materials are saturated with a thermosetting epoxy resin
either on the job-site or in an authorized Insituform wet out facility.
• Using water or air pressure, the tube is then inserted into the host
pipe by either a pull-in or inversion method.
• Following installation, hot water or steam is used to cure the
thermosetting resin.
• The pipe is cooled, the ends are cut, and the pipe is returned to
service. Lined sections are re-established to the existing system
using standard pipe fittings.
• Inspection of main prior to installation.
• Followed by post-installation inspection, pressure testing (at twice
the operating pressure).
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Excavate, remove the damaged portion of the pipe, install end couplers
and bridge the previously damaged location with new pipe and couplers.
V. Costs
Key Cost Factors
Case Study Costs
• Materials: liner and epoxy resin, fittings, valves and hydrants
• Mobilization
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
• Service plugging and reinstatement
• Site restoration
Not Available
VI. Data Sources
References
• www.insituform.com/mm/files/InsituMain%20Brochure .pdf
• www.insituform.com/content/579/insitumain-technical-
envelope.aspx
• Email and phone correspondence with David Rosenberg
A-30
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Datasheet A-15. Insituform PPL® CIPP Lining
Technology/Method Insituform PPL®/CIPP
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability (Underline
those that apply)
Emerging
Introduced in the early 1990s
Not Available
Insituform Technologies, Inc.
17999 Edison Avenue
Chesterfield, MO 63005
Phone: (636) 530-8000
Fax:(636)519-8010
Email: drosenberg@insituform.com
Web: www.insituform.com
• City of Albuquerque, NM
• CityofGreely, CO
• City of Detroit, MI
• City of Saskatoon, Saskatchewan, Canada
• Custom-engineered product designed to eliminate leakage and
prevent internal corrosion and/or erosion in structurally sound
pressure pipe.
• Designed with the flexibility to expand up to and transfer internal
pressure loading to the host pipe while maintaining the ability to
span any small holes, pits or open joints that may exist in the host
pipe.
• Design assumes that the host pipe is currently structurally sound and
will continue to carry the internal pressure loading for the life of the
piping system.
• Suitable for CI, DI, steel, AC, RCP, and thermoplastic pipes
• Thin wall and close fit minimizes reduction in flow cross section
• Flexibility to negotiate horizontal and vertical bends up to 90°
• Small site footprint required for installation
• Installed inside the existing main so there is no risk of damage or
disturbance to adjacent utilities or infrastructure
• Trenchless installation of CIPP reduces traffic and commercial
disruption, site noise, pollution and safety concerns as well as the
need for imported backfill and pavement reinstatement
• Bypass required
• Limited to structurally sound host pipes
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Industrial Pressure and Fire
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
CIPP Lining Rehabilitation of Water Mains
No specialty fittings required
Not a structural solution
• The CIPP tubes have a construction similar to that of standard
Insituform CIPP tubes, but special glass reinforcement is included to
address specific service conditions found in pressure applications.
• Resin system is either a vinyl ester or epoxy, depending on the
application.
A-31
-------
Technology/Method
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Insituform PPL®/CIPP
• For drinking water applications, a special epoxy resin system is used.
8 in. to 60 in.
Not Available
Up to 200 psi
Up to 120°F
200 ft to 1,000 ft (Typically)
pH range of 0.5 to 12
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
ASTMF-1216
50 years
In accordance with manufacturer's operation manual.
• The reinforced felt tube is saturated with a thermosetting resin, then
carefully packaged for transport.
• The tube is positioned in the pipeline using water pressure to turn the
tube inside out via the inversion process.
• The continuous hydrostatic pressure of the inversion process results
in a close fit with the host pipe.
• Following inversion, the thermosetting resin is cured by circulating
hot water throughout the tube. Once cured, the pipe is cooled, ends
are cut and sealed, and the pipe is returned to service.
• Samples tested in accordance with ASTM D-790 and ASTM D-638.
• The lined section is tested under pressure to check for water
tightness.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of the system before putting it back into service.
Excavate, remove the damaged portion of the pipe, install end couplers
and bridge the previously damaged location with new pipe and couplers.
V. Costs
Key Cost Factors
Case Study Costs
• Materials: liner and resin
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
Not Applicable
VI. Data Sources
References
• www.insituform.com/content/345/about insituform_ppl.aspx
• www.insituform.com/content/207/how insituform_ppl is installed.
aspx
• Insituform PPL Specification for Potable Applications
• Email and phone correspondence with David Rosenberg
A-32
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Datasheet A-16. Insituform Thermopipe® Hose Lining
Technology/Method Insituform Thermopipe®/Hose Liner
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
Introduced in the U.S. in 1997
Over 800,000 ft. installed worldwide
Insituform Technologies, Inc.
17999 Edison Avenue
Chesterfield, MO 63005
Phone: (636) 530-8000
Fax:(636)519-8010
Email: drosenberg@insituform.com
Web: www.insituform.com
• 1,550 ft of 12 in. Water Main
Dennis Pay, City of South Salt Lake
195 W. Oakland Avenue, South Salt Lake, UT 841 15
(801)483-6038
• 1,400 ft of 8 in.
Terry Hodnik, NIES Engineering
Hammond, IN
(219) 844-8680
• 1,000 ft of 8 in.
George Fanous, City of Grand Prairie, TX
(972)237-8143
• A thin reinforced polyethylene liner that is ideally suited for
rehabilitation of distribution water mains and other pressurized
piping systems.
• Supplied as a factory-folded "C" shape liner, the PE liner is winched
into the host pipe from a reel and reverted with steam.
• Once inflated and heated, the liner forms a close-fit within the host
pipe, creating a joint less, leak-free lining system able to
independently carry the full system internal design pressure.
• Can usually be completed within an 8-hour time period.
• The fully structural PE liner stops leakage by bridging and sealing
holes and faulty joints with the liner
• Improves quality of water within the water main
• Reduces social cost of water main repair because of low foot print
and minimal downtime
• Extends life of water infrastructure
• Bypass required
• Will collapse under external loads
• Cannot negotiate bends greater than 45°
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Industrial and Fire applications
II. Technology Parameters
Service Application
Service Connections
Hose Lining Rehabilitation of Water Mains
In pipe 6 in. in diameter and greater, service reconnections up to 10 in.
diameter can be made to the lined pipe by remote internal connection of a
mechanical sealing apparatus.
A-33
-------
Technology/Method
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Insituform Thermopipe®/Hose Liner
Independent structural lining, AWWA Class IV
Polyester Reinforced Polyethylene
2.75 in. to 12 in.
0.08 in. to 0.20 in.
170 psi (up to 230 psi for 4 in., 6 in., and 8 in. diameters)
140°F
1,600 ft (for 4 in. to 8 in.) and 700 ft (for 10 in. to 12 in.)
Can negotiate bends up to 45°.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
Manufacturer supplied internal pressure rating
50 years
In accordance with manufacturer's recommendations
• The pipe is dewatered and reasonably free of incoming water.
• The liner is winched in through an appropriate pipe opening.
• The liner is inflated using compressed air, then heated with steam.
• The liner is then cooled and adequate air pressure shall be
maintained during the cooling process to ensure a tight fit between
the liner and the host pipe when pressure is removed.
• After installation, the liner shall be cut to appropriate length to allow
fitting of end couplers capable of maintaining a leak proof seal at the
system design pressure.
• Prior to installation, CCTV inspection of the main is needed to locate
any obstructions, protrusion, changes in diameter or in-line valves.
• After installation, the liner is inspected again visually with CCTV,
and any abnormalities are noted.
• Pressure testing is carried out after cooling to the original ambient
ground temperature. The liner is subjected to an internal pressure
equal to twice the known operating pressure, or operating pressure
plus 50 psi, whichever is less.
• After a stabilization period, the test period is one hour. Make-up
water to maintain pressure is limited to 20 gallons per inch diameter
per mile of pipe per day.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Excavate, remove the damaged portion of the pipe, install end couplers
and bridge the previously damaged location with new pipe and couplers.
V. Costs
Key Cost Factors
Case Study Costs
• Materials: fittings and liner
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
Not Available
VI. Data Sources
References
• www.insituform.eom/mm/files/IBLU%20A4%20Therm%20Sheet.p
df
• Email correspondence with Lynn Osborn and David Rosenberg
A-34
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Datasheet A-17. LINK-PIPE Hydro-Seal™ Mechanical Sleeve
Technology/Method LINK-PIPE Hydro-Seal™/Mechanical Sleeve
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Not Available
Not Available
LINK-PIPE Inc.
27 West Beaver Creek Road, Unit #2
Richmond Hill, ON L4B 1M8
Phone: (800) 265-5696
Fax: (905) 886-7323
Email: info(5Uinkpipe.com
Web: www.linkpipe.com
Not Available
Hydro-Seal™ is an internal repair method, designed for joint
rehabilitation of water mains, repair of pin-holes, cracks, and areas of
corrosion.
• Provides long-term seal of leaks using mechanically locked stainless
steel sleeves and aquatic resin sealers
• Seals leaking and separated, misaligned, and offset joints
• Seals pinholes
Only used for spot repairs up to 3 ft long
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair by Mechanical Sleeve
Need to address separately.
Punching holes in the sleeve is not recommended.
Not structural
• The sleeve core is made of stainless steel SST-3 16.
• Outside gasket is saturated with resin.
4 in. to 54 in.
Less than 3/8 in.
Tested up to 560 psi (37 bar) for ultimate pressure over a 3/8 in. (10 mm.)
wide open joint.
Maximum recommended working pressure in the pipe is 150 psi.
Not Available
Standard lengths of 12 in., 18 in., 24 in., and 36 in. are available.
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
NSF/ANSI Standard 61 Certification
ASTM A-240
More than 50 years
As per manufacturer's guidelines
• For repairs, the main must be taken out of service .
• The prospective work site in the pipe should then be pre-inspected
using a CCTV camera to determine the internal condition of the host
pipe and the location of the intended installation.
• Prior to an installation, the main must be thoroughly cleaned of any
A-35
-------
Technology/Method
QA/QC
LINK-PIPE Hydro-Seal™/Mechanical Sleeve
deposits exposing the pipe wall to bare metal over the repair area.
• A second CCTV inspection should be made following the cleaning
to verify that the pipe is ready for the repairs.
• In preparation for the installation the plug must be calibrated.
Calibration pressure is the pressure required to inflate the plug
rubber to make contact with inside wall of the host pipe.
• Sleeve preparation: Supplied resin is mixed and worked into the felt
gasket. The gasket is then wrapped around the sleeve and tied so as
to hold it on the sleeve. The prepared sleeve is then mounted on the
air plug specified for installation. Slight pressure is applied to the
plug to hold the sleeve in place while the assembly travels in the
pipe. A camera is attached in front of the plug/sleeve assembly
looking back on the sleeve to monitor sleeve transportation and
installation of the sleeve.
• When the sleeve arrives to the repair site, it is positioned while being
observed by the CCTV camera.
• Installation is complete when all locks are engaged. Engaging of the
locks is often announced by clicking sounds that can be heard
coming from the pipe. As soon as the locks are engaged, the plug
must be deflated. The resin must be left to cure undisturbed.
• Before removing the Plug from the pipe, or moving on to another
installation site, the sleeve must be re-inspected to make sure all
locks are engaged. Equipment is then retrieved.
Manufactured under ISO-900 1:2000 certified quality control conditions.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Regular inspection and cleaning is required.
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Stainless steel sleeves
• Resins materials
• Pits for access to the main
Not Available
VI. Data Sources
References
www.linkpipe.com/applications.htm
www.linkpipe.com/PDF/hs specifications internet.pdf
A-36
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Datasheet A-18. MainSaver™ Composite Lining
Technology/Method MainSaver™/Cement-Polyethylene Composite Liner
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Innovative
UK market in 1999 and U.S. market in 2006
Approximately 7,000 ft installed in the U.S.
MainSaver™
14062 Denver West Parkway, Suite 110, Building 52
Golden, CO 80401
Phone: (303) 277-8603
Fax: (303) 277-0042
Toll Free: (866) 594-8345
Email: info@mainsaverworld.com
Website: www .mainsaverworld .com
• City of Thornton
12450 Washington Street
Thornton, CO 80241-2405
Jason Pierce, (720) 977-6274
MainSaver is a flexible MDPE tube with integral grout key hooks on the
outside surface, which is inserted into the main, then a predetermined
quantity of proprietary cement grout is placed between the outside of the
tube and the inside of the host. Air pressure is used to move a swab along
the length of the liner, which progressively expands the tube and
distributes the grout against the interior surface of the host pipe. Used to
renew pipes with holes, displaced joints, and leaking joints.
• Suitable for use with ferrous, AC, reinforced concrete, and PCCP
• PE tube ensures water quality, prevents leakage and restores
hydraulic capacity
• Service connections can be reinstated robotically to reduce
excavation requirements
• Designed for pressure pipes only
• Unsuitable for lining PVC, PE, or PE/PU/bituminous coated pipe
• Unsuitable for lining through diameter changes
• Cannot negotiate bends greater than 1 1 .25° elbows
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Cement-Polyethylene Composite Lining Rehabilitation of Water Mains
Uses a RoboTap™ method for remote robotic service connection
reinstatement after the composite has been installed.
Class III, Interactive and Semi-Structural Liner
• Medium-density polyethylene
• Cement mortar (Masterflow® 1515 PipeSaver)
4 in. to 12 in.
Up to 3 mm, however, grout will often be thicker where it is filling pipe
defects.
Maximum hole size of 1 in. with pressure up to 294 psi (20 bar)
37°F and up (ideally between 40°F and 80°F during installation)
Up to 500 ft
A-37
-------
Technology/Method
Other Notes
MainSaver™/Cement-Polyethylene Composite Liner
Cathodic protection can be restored to ferrous pipes to retard external
corrosion.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
Not Available
50 years
As per manufacturers guidelines
• Main must be thoroughly cleaned and CCTV inspected.
• Robotically plug any open service connections where unwanted
grout may migrate.
• The liner is winched in and at the end where grout is to be
introduced; a grout injection fitting is fixed to the main.
• Trim other end of liner and install tensioning and anti -twist
assembly.
• Grout slug is pumped into the grout fitting and the rounding swab is
advanced down length of lining run to distribute the mortar around
the outside of the liner.
• The liner is held under very low air pressure in order to allow the
grout to hydrate for 16 hours.
• Once the grout is hydrated, the lining is inspected using CCTV and
Infrared thermography.
• Services are remotely reinstated and PE end seals are installed to
protect the liner while it's being returned to service.
• The pipe is disinfected before being put back into service.
• The Quality Management System is certified to ISO 900 1 :2000 for
the Custom Manufacture of NSF/ANSI Standard 61 Extruded Tape
and Insitu Remediation of Potable Water Lines.
• Post-lining the installation is CCTV and IRTV (Infrared) inspected
to verify grout distribution behind the liner.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
No special maintenance needs.
The liner can be cut out with the damaged pipe section and conventionally
patched with a spool piece.
V. Costs
Key Cost Factors
Case Study Costs
• Liner material and equipment
• Mobilization
• Entry and exit access pits
• Surface restoration
• Cleaning and inspection
• Traffic control requirements
Not available
VI. Data Sources
References
• www.mainsaverworld.com/about
• Email correspondence with Dan Cohen and Bruce Butler.
A-38
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Datasheet A-19. Miller Pipeline Weko-Seal® Joint Seal
Technology/Method Miller Pipeline Weko-Seal®/Internal Joint Seal
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1980
Over 285,000 installations to date.
Miller Pipeline Corp.
8850 Crawfordsville Rd.
Indianapolis, Indiana 46234
Phone:(317)293-0278
Fax:(317)293-8502
Email : terrv .bell^millerpipeline . com
Web: www.millerpipeline.com
• Denver Water
• City of Dallas, Water Department
• Ft. Worth Water
• City of Milwaukee, Milwaukee Water Works
• Santa Clara Valley Water Department
• City of Des Moines Water
• Marietta Water Authority
• DC Water and Sewer Authority
The Weko-Seal® is flexible rubber leak clamp that ensures a non-
corrodible, bottle-tight seal around the full inside circumference of the
joint area. Its design incorporates a series of proprietary lip seals that
create a leak proof fit on either side of the joint. Installed internally with
up to 2,000 feet between access points, the seal can be utilized in square,
rectangular, round or elliptical pipes, including transitions, fittings, and
vertical offsets or specialty configurations. In nuclear and fossil fuel
power plant applications, the WEKO-SEAL® is used for sealing leaks in
both fresh and seawater cooling and circulation lines.
• Non-corrodible seal with minimal reduction of internal diameter
• Accommodates normal pipe movement from ground shifting,
thermal expansion or contraction, and vibration
• Test valves standard in all seals
• Minimum surface disturbance
• Access openings can be in excess of 2,000 feet apart
• Bypass pumping required
• Applicable for accessible pipes only or end of non-accessible pipes
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Natural Gas. Industrial, and Nuclear
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Spot Repair with Internal Joint Seals
Not applicable
Non-structural
• Cement mortar
• Stainless steel retaining bands
• EPDM rubber
16 in. to 216 in.
Approximately 1 in. diameter reduction after installation.
A-39
-------
Technology/Method
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Miller Pipeline Weko-Seal®/Internal Joint Seal
Up to 300 psi
0°F to 305°F
• Spot repair technology, seals vary from 1 1 in. to 18 in. long.
• Extended coverage can be achieved through sleeve/seal concept.
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Classified by UL for NSF/ANSI Standard 61 (not listed on the NSF
website)
ASTM D-3568 and ASTM D-3900
50 years
As per manufacturer's guidelines
Selected seal straddles the leaking joint and is held firmly in position by
hydraulically expanded stainless steel retaining bands.
• Seals are tested to provide a 100% positive leak-proof barrier
through the test port located within each seal.
• Installations typically performed by manufacturer's trained
installation personnel.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Dewatering, lock-out/tag-out, access and means for ventilation.
V. Costs
Key Cost Factors
Case Study Costs
• Seals and equipment
• Mobilization
• Entry access pits
• Cleaning
• Surface restoration
Not Available
VI. Data Sources
References
• www.millerpipeline.com/weko-seal.html
• Email correspondence with Terry Bell
A-40
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Datasheet A-20. NordiTube NordiPipe™ CIPP Lining
Technology/Method NordiTube NordiPipe™/CIPP
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Innovative
Introduced in 2002 in Sweden, 2004 in Canada, 2009 in the U.S.
Approximately 34 miles installed annually in North America
Sekisui NordiTube Inc.
501 N. El Camino Real, Suite 224
San Clemente, CA 92672
Phone:(714)267-1030
Email: j aykeating@cox.net
Web: www.sekisuispr.com/public/spr/en
• Jean Lemire, City of Cornwall
1225 Ontario Street
Cornwall, Ontario, Canada K6H 5T9
Phone : (613) 930-2787
Email: jelemire(g),cornwall.ca
• Tony Di Fruscia, City of Montreal
13301 Sherbrooke St. E., Suite 209
Montreal, Quebec, Canada HI A 1C2
Phone : (5 14) 872-6678
Email : tonydifruscia(S>ville .montreal .qc .ca
• Annie Fortier, City of Dorval
60 Martin Ave.
Dorval, Quebec, Canada H9S 3R4
Phone:(514)633-4244
Email: afortier(S>ville.dorval.qc.ca
NordiPipe™ is a CIPP system that incorporates a glass fiber reinforced
layer(s) between two polyester felt layers, impregnated with epoxy resin.
A PE coating is on the interior of the liner.
• Fully-structural, no support of the host pipe required for internal or
external loads
• High pressure resistance
• Can negotiate bends up to 45°
• Not recommended for low ground temperature when using epoxy
• Bypass required
• Cannot negotiate bends greater than 45°
Force Main Gravity Sewer .Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
CIPP Lining Rehabilitation of Water Mains
Internally reinstated robotically or externally by excavation
AWWA Type IV - Fully-structural
• Polyethylene coating in contact with potable water
• Non-woven felt and glass fiber woven mat
• Epoxy or vinyl ester resin
6 in. to 48 in. (150 mm to 1200 mm)
0.18 in. to 0.94 in. (4.6 mm - 24 mm)
6 in. to 250 psi and 48 in. to 60 psi
A-41
-------
Technology/Method
Temperature Range, °F
Renewal Length, feet
Other Notes
NordiTube NordiPipe™/CIPP
100°F with epoxy and 160°F with vinyl ester
800 ft to 1,000ft
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
ASTMF-1216
50 years
Not Available
• The liner is either air inverted with air/steam cure, or water
inverted with circulated water cure.
• Service reinstatement is performed internally with robotics
externally with saddles.
column
or
• Resin yield check for impregnation
• Pressure gauges for air inversion
• Temperature monitoring during cure
• Hydrostatic pressure test and post installation video for acceptance
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Protection of the PE coating during inspection or cleaning
• Install a spool piece with mechanical couplings/fittings
• Link-Pipe ring repair
V. Costs
Key Cost Factors
Case Study Costs
• Materials: liner, resin, fittings, valves and hydrants
• Mobilization
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
• Service plugging and reinstatement
• Site restoration
Not Available
VI. Data Sources
References
• www.sekisuispr.com/public/spr/en/technoloav/schlauchlinina/nordip
ipe.html
• Email correspondence with Steve Leffler and Jay Keating
• Norditube brochure
A-42
-------
Datasheet A-21. NordiTube Tubetex™ CIPP Lining
Technology/Method NordiTube Tubetex™/CIPP
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Introduced in 1986 in Europe
Several kilometers for gas and water
Sekisui NordiTube Inc.
501 N. El Camino Real, Suite 224
San Clemente, CA 92672
Phone:(714)267-1030
Email: j aykeating@cox.net
Web: www.sekisuispr.com
Not Available
This type of liner was developed in Japan to rehabilitate pipes in
earthquake areas. It has a unique coating which combines with the round,
woven fabric pipe; TUBETEX™ can cope with many gas and water-
related problems.
• Adheres to the old pipe but remains extremely flexible
• Approved for host pipes up to PN 32
• Can negotiate bends up to 90°
• Support service offered by experts every step of the way
• Bypass required
• Not available currently in the U.S.
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
CIPP Lining Rehabilitation of Water Mains
Internally reinstated robotically or externally by excavation
Not Available
• PE coating in contact with potable water
• High modulus polyester yarn tube
• Epoxy resin
4 in. to 40 in. (100 mm to 1000 mm)
Not Available
Up to 460 psi (32 bar)
Not Available
Up to 1,970 ft (600m)
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
• Not NSF/ANSI Standard 6 1 Certified
• Approved for potable water in various countries
Not Available
50 years
As per manufacturer's guidelines
• The liner is inverting with a pressure drum and cured with
• Service reinstatement is performed internally with robotics
externally with saddles.
steam.
or
• Manufactured in accordance with ISO 900 1
IV. Operation and Maintenance Requirements
A-43
-------
Technology/Method
O&M Needs
Repair Requirements for
Rehabilitated Sections
NordiTube Tubetex™/CIPP
Protection of the PE coating during inspection or cleaning
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Materials: liner, resin, fittings, valves and hydrants
• Mobilization
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
• Service plugging and reinstatement
• Site restoration
Not Available
VI. Data Sources
References
www.sekisuispr.com/public/spr/en/technologv/schlauchlining/tubetex.ht
ml
A-44
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Datasheet A-22. Nu Flow Epoxy Coating
Technology/Method
Nu Flow Epoxy/Forced Air Epoxy Coating
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Not Available
Not Available
Nu Flow Technologies Inc.
1010 Thornton Rd. South
Oshawa, Ontario L1J 7E2
Phone: (800) 834-9597
Fax: (905) 433-9687
Email: info(®nuflowtech.com
Web: www.nuflowtech.com
• MetLife Building, New York City , NY
• Bonner Hospital, Sandpoint, ID
Streamlines restoration in a quick, cost-effective way. Nu Flow's non-
invasive epoxy pipe lining process can resolve plumbing concerns. The
epoxy solution minimizes the destruction and disruption to the building
and its occupants, while insuring the building will be impervious to these
problems in the future.
Safe, durable, cost effective, and flexible.
• Limited to diameters less than 10 in.
• Not applicable for water mains
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Industrial pressure lines
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Coating Repair of Water Services
Valves and couplings are refitted after curing
Not Available
Epoxy
!/2in. to 10 in.
12 mils
Not Available
Not Available
10 ft to 1,000ft
The process can be used on a variety of piping materials including
galvanized steel, copper, CI, black iron, and lead pipe. The abrading
agent is EPA-approved sand for open and closed blasting locations. The
cured epoxy product is durable and impervious to the corrosive action of
acids, alkalis, and petroleum.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
NSF/ANSI Standard 61 approved by Underwriters Laboratories, Inc. (not
listed on the NSF website)
• Potable Water Part A #700
• Potable Water Part B #720
35 to 50 years under normal use (has exhibited a potential useful life up to
80 years in accelerated laboratory mechanical testing).
Not Available
• System diagnosis begins with mapping the internal plumbing system
A-45
-------
Technology/Method
QA/QC
Nu Flow Epoxy/Forced Air Epoxy Coating
and inspecting it for integrity and spot repairs are made to
excessively worn joints and fittings. Temporary bypass water piping
may be installed. The system is drained and air-dried. After testing
for leaks, the pipes are prepared for cleaning.
• Pipes are dried with heated, compressed air. A safe abrading agent is
blown through the pipe system, removing rust and corrosion by-
products that are collected in a holding unit for disposal.
Compressed air is applied once again to remove fine particles.
• Optimal internal pipe surface temperature is created prior to epoxy
coating. Another air pressure leak test is performed. Conditioned air
is then introduced into the pipe to uniformly distribute the epoxy
coating throughout the pipe segment. Following the coating
application, continuous controlled air flows through the piping to
facilitate epoxy curing.
• After curing, valves and couplings are refitted. A final leak test and
inspection confirms lining integrity.
Water quality, volume, and flow tests confirm system functionality.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Not Available
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Epoxy materials
• Forced air equipment
• Access to the service
• Duration of cure, entire process takes 2 to 3 days
Not Available
VI. Data Sources
References
• www.nuflowtech.com/Products/EPOXYLINING.aspx
• Nu Flow Technical Specifications
• Phone conversation with Cameron Manners
A-46
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Datasheet A-23. Pipe Wrap A+ Wrap™ Pipe Wrapping
Technology/Method Pipe Wrap A+ Wrap™/Pipe Wrapping
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Innovative
October 2006
Not Available
Pipe Wrap LLC
P.O. Box 270190
Houston, TX 77277
Phone: (713)365.0881
Fax: (713) 463 .4459
Web: www.piperepair.net
E-mail: info(Sipiperepair.net
Not Available
The A+ Wrap™ Repair System is a pliable water-activated high strength
composite sleeving system used to permanently repair external defects
associated with general corrosion up to 80% wall loss, blunt dents, and
gouges. The system is comprised of a high compressive strength putty, an
epoxy coating, smart pig detector tabs (as applicable), and the load
carrying composite wrap.
• Conformable high strength piping remediation wrap consisting of
proprietary glass fiber reinforcement fabric that is factory
impregnated with durable, moisture cured polyurethane resins
• Offers non-intrusive piping remediation, repair, reinforcement,
and/or complete hoop strength replacement to any size, material,
shape or configuration including elbows, manifolds, tees, or bends
• Efficient and economical
• Chemically resistant, nonconductive, and temperature resistant
• Only used externally
• Requires excavation
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Oil and Gas lines
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Spot Repair of Water Mains
Service connections have to be done separately if required.
• Shear Modulus 185,000 psi as per ASTM D-5379
• Tensile Modulus 3 . 0 1 x 1 06 psi as per ASTM D-3 03 9
• Tensile Strength 5 1,800 psi as per ASTM D-3039
• Flexural Modulus 1 .9 x 106 psi as per ASTM D-790
• Thermal Expansion 10.2 (um/m/C0) as per ASTM E-83 1
Resin impregnated woven fiberglass
!/2 in. and up
Ply thickness 0.022 in. (22 mils)
No pressure limit (design of the systems are based on the maximum
working stress of steel pipe). All pipelines are designed in accordance
with the basic formula, where the maximum allowable wall stress is a
constant regardless of pressure.
176°F (80°C)
No limitation, limited by access only
A-47
-------
Technology/Method
Other Notes
Pipe Wrap A+ Wrap™/Pipe Wrapping
Setting Time of 1 hr and a curing time of 24 hrs to achieve 100%
operational use.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
• Allowed for DOT pipeline repairs under 49 CFR, Parts 192 and 195,
as well as being validated and certified for use under the ASME
PCC-2 Article for B3 1.3, B31.4 and B31.8, ISO 24817.
• Meets NSF/ANSI Standard 6 1 2007a, Section 6 (not listed on the
NSF website), tested in May 2008 by IAPMO R&T Lab, Project No.
14177, results available upon request.
• ASTM D-790, ASTM D-3039, ASTM D-5379, and ASTM E-83 1
20 years
• As per manufacturer's guidelines
• The anchor pattern and cleanliness requirement shall meet the
minimum standard of NACE #3 or SA 2 !/2 (NACE #1 is preferred)
finish or equivalent for pipe surface preparation prior to installation.
• Solvent wipe blasted surfaces.
• In the event that the repair zone of the pipe cannot be sandblasted, a
hand grinder with disc (24 to 80 grit) may be used to create a clean
anchor patterned surface. Solvent wipe surface (as applicable).
• Prepare pipe by abrasive blast to produce a uniform 2.5 to 4 mil
profile. Disk grinding, wire brush or wire wheel can be used as
alternatives in some situations.
• Apply accompanying undercoating, according to directions, over
prepared area. Wrap tightly over the coating. Wrap a layer, spray
with water and repeat until area is covered. Wrap constrictor wrap,
perforate, remove when cured.
In-house procedure as per ISO 900 1
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
The system shall be disinfected in accordance with local standards.
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Wrap materials
• Access to the main
• Surface restoration
Available on request
VI. Data Sources
References
• www.piperepair.net/apluswrap.html
• E-mail correspondence with Jim Souza and Gen Withers
A-48
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Datasheet A-24. Powercrete® PW Epoxy Coating
Technology/Method Powercrete® PW/Spray-On Epoxy Coating
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Not Available
Not Available
Protection Engineering
2201 Harbor St., UnitC
Pittsburg, California 94565
Phone: (925) 427-6200
Fax: (925) 427-6202
Web : http ://powercrete .corrosioncoatings.com/index.htm
Email: info^corrosioncoatings.com
Not Available
Powercrete® PW is a liquid epoxy polymer coating designed for use on
potable and wastewater pipes and storage tanks. The coating is effective
for slurries and abrasive applications and offers protection from corrosion
as it provides high adhesion to bare steel and ductile iron along with
abrasion resistance.
• Same formula can be hand or spray applied
• Flexibility in difficult to coat field conditions
• Adhesive to, cathodic disbondment and soil stress resistance on bare
steel
• Requires man-entry for internal use
• Not a structural solution
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Storage Tanks
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair Coating of Water Mains
Need to be plugged or done in a second phase.
ASTM C-109, ASTM D-2240, and ASTM D-3289
100% Solids Liquid Epoxy, no VOCs or isocyanates
8 in. and up
0.02 in. (20 mils)
Not Applicable
Maximum operating temperature is 140°F
Limited by length of hose if spray applied
Mix ratio A:B is 100:5.5 by weight.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
• NSF/ANSI Standard 61 Certification
• WRc-NSF, UK BS: 6920 Standard Certified
ASTM C-581, ASTM D-149, ASTM D-570, ASTM D-4060, ASTM D-
4541, ASTM G-14, ASTM G-95, and NACE RP0394-2002
Not Available
If the surface to be coated is below 10°C (50°F), preheating of the
substrate is recommended. Preheat temperatures should not exceed 82°C
(180°F) prior to the application.
The coating is applied by spraying 1 coat, roughly 20 mils thick. Curing
takes 24 hrs at 25°C (72°F) and 10 days at 43°C (104°F) +/- 3°C.
A-49
-------
Technology/Method
QA/QC
Powercrete® PW/Spray-On Epoxy Coating
Disinfection as per AWWA standards when used in potable water pipes.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Not Available
The coating can be reapplied over rehabilitated sections.
V. Costs
Key Cost Factors
Case Study Costs
• Epoxy materials
• Entry and exit access pits
• Duration of cure time
Not Available
VI. Data Sources
References
• www.berrvcpa.com/index.asp ?marca=004
• http://powercrete.corrosioncoatines.com/powercrete-pw.html
A-50
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Datasheet A-25. Quake Wrap™ Pipe Wrapping
Technology/Method QuakeWrap™/Pipe Wrapping
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Mid-1990s
More than 6,500 If of pipe
QuakeWrap, Inc
2055 E. 17th St.
Tucson, Arizona 85719
Phone: (520) 791-7000
Fax: (520) 791-0600
Toll Free: (800) 782-5397
Email: engineering@quakewrap .com
Web: www.quakewrap.com
• FRP Construction, Tucson, Arizona
San Juan Generating Station, 700 ft of 10 in. PCCP
San Juan Generating Station, sections of 4 ft and 10 ft steel
El Encanto Pipeline, Costa Rica, 5700 ft of 7 ft concrete pipe
• Nuclear Power Plant, 1 1,500 ft2 on 9 ft diameter PCCP
QuakeWrap™ VU18C is a high -strength unidirectional carbon fabric.
The fabric is impregnated in the field using QuakeBond™ J300SR
saturating resin to form a CFRP used to strengthen structural elements.
• Strong and lightweight fabric ideal for confined spaces
• Used for flexure and shear strengthening as well as confinement
• Can be wrapped around complex shapes
• Non-corrosive and alkali resistant
• Requires man-entry if used internally
• Requires excavation if used externally
• Not to be used on concrete pipes in freeze thaw areas
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Water Tanks
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, ° F
Spot Repair of Water Mains
Can be cut to fit around services
• Nominal tensile strength is 4. 1 kips/linear inch of width of FRP strip.
• For multiple layered FRP with all carbon fibers running in the same
direction, the total force is 98 kips by the number of layers.
Epoxy resin and carbon fabric
36 in. and up if used internally and any size if used externally
1/8 in. (90 mils)
Depends on the diameter of the pipe and the number of layers considered.
The formula to calculate the nominal pressure capacity is P = 2nT/D;
where P is the nominal internal pressure capacity provided by the FRP
liner, n is the number of layers, T is the nominal tensile strength of the
laminated FRP and D is the diameter of the pipe. For example, if you are
retrofitting a 24 in. pipe with 2 layers of VU18C, the nominal increase in
the internal pressure capacity of the pipe will be P = 2(2 layers)(4100
psi)/24in. = 683. 33 psi.
32°F to 140°F (0°C to 60°C)
A-51
-------
Technology/Method
Renewal Length, feet
Other Notes
QuakeWrap™/Pipe Wrapping
Limited by access only
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
ASTM D-2584 and ASTM D-3039
Up to 50 years
The manufacturer specification addresses proper prep work, installation
and curing procedures.
• A tack coat is applied at a ratio of 2: 1 by volume up to 40 mils.
• The second layer involves applying a coat of saturating resin to the
carbon fabric at a ratio of 2: 1 by volume (to a maximum 50% by
volume of resin to fabric) to 50 mils.
• Provided in the FRP installation specification.
• In general, QA/QC involves testing of the pipe substrate pull off
strength, FRP pull off strength and FRP tensile strength.
• FRP installation quality is addressed by establishing repair measures
as a function of the size and dispersion of blisters. Such blisters
develop due to entrapped air bubbles or delaminations of the FRP.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Repair procedures during FRP installation are addressed in the QA/QC
sections of the specifications.
V. Costs
Key Cost Factors
Case Study Costs
• Materials: Carbon fabric and saturating resin
• Mobilization
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
• Site restoration
Unit prices for retrofit of pipelines in US power plants have a practical
range of $30/sf to $40/sf of CFRP liner. This price includes engineering,
installation supervision, materials, and installation labor.
For the Costa Rica pipeline, a glass FRP liner was installed. The unit
price was around $8/sf and included materials, engineering, and
installation supervision, but excluded installation labor (provided by the
prime).
VI. Data Sources
References
• www.nsf.org
• www.quakewrap .com/pipes .php
• Phone and email correspondence with Carlos Pena
A-52
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Datasheet A-26. Radlinger Primus Line ® Hose Lining
Technology/Method Radlinger Primus Line®/Hose Liner
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
Introduced in the Germany in 200 1
Not Available
Radlinger Primus Line GmbH
Kammerdorfer Strasse 16
Cham, Germany 93413
Phone: +49 (0) 9971 400-3100
Fax: +49 (0)9971 400-3 123
Email: primusline@raedlinger.com
Web: www.raedlinger.com
• Gemeindeverwaltung Griinwald - Wasserwerke
85 m of 6 in. and 8 in. drinking water pipe up to 232 psi
• Berliner Wasserbetriebe, Berlin, Germany
60 m of 6 in. siphon underneath a canal
• ENI Neapel, Italy
2300 m. of 8 in. drinking water pipe
Primus Line® is a new technology of flexible high-pressure pipes for the
transport of gases and liquids in large diameters. It is used in the
renovation of high-pressure pipes, as bypass-pipe during maintenance and
in other fields of application.
• Renovation of high-pressure pipes
• Able to negotiate bends in big lengths
• Close fit liner limits the loss of diameter
• Bypass required
• Cannot negotiate 90° bends
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas. Oil, and Bypass pipes
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Hose Lining Rehabilitation of Water Mains
Must be excavated and reconnected
Not-structural
Seamless woven aramid fiber embedded in high-performance plastic
6 in. to 18 in.
Up to 6 mm
Up to 1,000 psi (double layer design for a 6 in. pipe)
Not Available
Up to 6,000 ft
The liner is winched into the host at a rate of 1,200 ft/hr.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
• Not NSF/ANSI Standard 6 1 Certified
• DVGW German Technical and Scientific Assoc. for Gas and Water
• Meets the certification of KTW and W270
Not Available
Not Available
In accordance with manufacturer's recommendations
• The existing pipe is dewatered, the condition of the host is inspected
A-53
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Technology/Method
QA/QC
Radlinger Primus Line®/Hose Liner
with a camera which pulls in a rope and the pipe is cleaned.
• The liner is winched in through the entry access pit.
• The liner is fixed to the existing system with specialty couplings that
are based on an inner sleeve and an outer sleeve. The inner sleeve is
put into the inliner; the outer sleeve is slid over the inliner.
• A deformable steel jacket is welded on the inside of the outer sleeve
to form a casing.
• A resin is pressed into this casing and forces both the steel jacket and
the inliner to move into the contours of the inner sleeve.
• After curing of the resin the coupling serves as a durable and save
joint. The inner sleeve of the coupling can be welded on the existing
pipe. T-iron or other special pipe components can be fixed by
common welding engineering.
• The flexible tube is then pressurized and the coupling is slid into
place.
• Pressure testing is carried out after installation
• Manufacturing certified to ISO 9001:2000 and ISO 14001:2004
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Excavate, remove the damaged portion, install end couplers and bridge
the previously damaged location with new pipe and couplers.
V. Costs
Key Cost Factors
Case Study Costs
• Materials: liner plus specialty couplings and fittings
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
Not Available
VI. Data Sources
References
• www.primusline .com/en/technoloav/medium-hiah-pressure-
svstem/svstem/
A-54
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Datasheet A-27. RLS Solutions AquataPoxy® Epoxy Lining
Technology/Method AquataPoxy®/Spray-On Epoxy Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Used in North America over the past 10 years
Over 360,000 ft in water pipe
RLS Solutions Inc.
13105 East 61st Street, Suite A
Broken Arrow, Oklahoma 74012
Phone:(800)324-2810
Fax: (918) 615-0140
Email: henkej @rl ssolutions.com
Web: www.rlssolutions.com
New York Aqueduct, 700 mi. of 8 in. to 20 in. diameter multi-material
125 year-old pipes
AquataPoxy® can be applied using the CuraFlo Spincast System™, a
trenchless, in situ technology that rehabilitates water, drain line, and
industrial process pipes. It repairs and protects metal and cement-based
pipes by centrifugally casting 1 to 5+ mm. of a solvent-free, protective
coating on to the interior surface of the pipe.
• Restores and sustains water quality
• Restores water pressure
• Protects against future leaks and corrosion
• Extend service life of the pipe
• Unable to negotiate 90° bends
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Tanks. Reservoirs, and Basins
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Lining Rehabilitation of Water Mains
Must be drilled robotically if plugged during lining
Not Available
100% solids epoxy
3 in. to 36 in.
1 to 5+ mm
Not Available
Approved for use in pipes with water temperatures up to 180°F
Up to 500 ft segments
Not Applicable
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
Not Available
50 years
As per manufacturer's guidelines
The Spincast process begins by using specialized equipment to clean the
pipes and remove corrosion. Pipes are then lined by centrifugally casting
epoxy onto the interior surface of the pipe, creating a seamless barrier.
After the epoxy lining is applied, potable water pipes are inspected to
ensure water quality.
Disinfection as per AWWA standards
A-55
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Technology/Method
AquataPoxy®/Spray-On Epoxy Lining
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Not Available
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Epoxy Materials
• Spraying equipment
• Entry and exit access Pits
• Cleaning and inspection
Not Available
VI. Data Sources
References
• http://ravenlining.com/ServiceOfferings/PipeRestoration.aspx
• http://ravenlining.com/ServiceOfferings/ProductsServices.aspx
• http://curaflo.com/EpoxvPipeLining/WaterSafetvCertified.aspx
• New York Restoration: Case No. 58
A-56
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Datasheet A-28. Sanexen Aqua-Pipe® CIPP Lining
Technology/Method Sanexen Aqua-Pipe®/CIPP
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Innovative
2000 in Canada and 2005 in U.S.
Over 800,000 ft installed since 2000 in Eastern Canada and the U.S.
Sanexen Environmental Services Inc.
1471 Lionel-Boulet Blvd., Suite 32
Varennes, Quebec J3X 1P7
Phone: (450) 652-9990
Toll Free: (800) 263-7870
Fax: (450)652-2290
Email: aqua-pipe @sanexen. com
Web: www.aqua-pipe .com
• John Vose, City of Naperville, (630) 420-6741
1200 W. Ogden
Naperville, IL 60563
• Kevin Bainbridge, City of Hamilton (905) 546-2424, ext. 5677
320-77 James St. North
Hamilton, ON L8R 2K3
• Kamran Sarrami, City of Toronto, (416) 395-6370
North York Civic Center, 2nd Floor
Toronto, ON M2N 5V7
Sanexen, in collaboration with the NRC Canada developed a new
structural liner for the structural rehabilitation of drinking water mains.
Aqua-Pipe® is an economical and viable alternative to the water main
problems where, in the past, dig and replace was the only choice.
The line is a class IV structural liner that is designed and manufactured
with mechanical properties exceeding all specifications and meeting
drinking water requirements
• Installation of 2,500+ ft per week and negotiates bends up to 45°
• Corrosion resistance and no effect on water quality
• Economic considerations include small carbon footprint
• Bypass required
• Cannot negotiate 90° bends due to limitations of the robot
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
CIPP Lining Rehabilitation of Water Mains
• Service connections are reinstated from within the lined pipe using a
remote controlled mechanical robot.
• CCTV is used for monitoring the operation.
• Water tightness is preserved by the resin that surrounds the threaded
cavities of the service connections and ensures a tight bond.
Class IV (AWWA M28 Manual) fully structural independent liner
• Composed of two concentric, tubular, plain woven seamless
polyester jackets and a polymeric membrane bonded to the interior
to ensure water tightness.
• The liner is impregnated with a thermoset epoxy resin that allows a
A-57
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Technology/Method
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Sanexen Aqua-Pipe®/CIPP
tight bond between the liner and the host pipe.
6 in. to 12 in.
3 to 6 mm
Up to 150 psi (operating pressure)
35°Fto 100°F
100 ft to 500 ft between access pits (typical 350 ft)
Hazen -Williams coefficient of up to 120 or more
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
• NSF/ANSI Standard 61 Certification
• BNQ Standard 3660-950
ASTM F- 12 16 and ASTM F-1743
50 years
In accordance with manufacturer's operation manual.
• Precisely aligned with the host pipe's point of entry and pulled
through to the exit point.
• Shaping is achieved by pushing a pig through the hose using water
pressure. Circulating hot water ensures the curing process.
• Day 1 : Cure 1.5 hrs at 65°C and 25 psi water pressure, then cure for
12 hours at ambient temperature and 50 psi water pressure
• Day 2: Flush at 2.8 liters per minute for 24 hrs at ambient
temperature
• Day 3 : Cure for 24 hours at ambient temperature
• This product requires a 1 hour flush with potable water prior to being
placed into service.
The lined section is tested under pressure to check for water tightness.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
• Pressure or dry taps for future service connections can be easily
carried out with no special equipment.
• Disinfection of system before putting it back into service.
• Typically need to cut out defective pipe and replace with new pipe.
V. Costs
Key Cost Factors
Case Study Costs
• Materials: liner, resin, fittings, valves and hydrants
• Mobilization
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
• Service plugging and reinstatement
• Site restoration
• Hamilton = $133/ft
• Toronto = $137/ft
• Naperville = $186/ft
VI. Data Sources
References
• www.sanexen.com/en/aquapipe/tech info_product.htm
• Communication with Valerie Belisle, Michael Davison, and Joseph
Loiacono
A-58
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Datasheet A-29. Sprayroq SprayShield Green® I Polyurethane Coating
Technology/Method Sprayroq SprayShield Green® I/Spray-On Polyurethane Coating
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
Introduced in January 2007 in the U.S.
Over 5,000+ Structures repaired/rehabilitated to date
Sprayroq, Inc.
248 Cahaba Valley Parkway
Pelham,AL 35124
Toll Free: (800) 634-0504
Phone: (205) 957-0020
Fax: (205) 957-0021
Email: info@sprayroq.com
Web: www.sprayroq .net
• Wayne Schutz, Assistant Manager
Deny Township, PA
Email: wschutz@dtma.com
Office: (717) 566-3237, x312, Cell: (717) 497-8026
• Rodney Jones, Construction Program Manager
County of Sarasota, FL
Email: rjones@scgov.net
Cell: (94 1)232-8295
SprayShield Green® I is an elastomeric, 100% solids polyurethane
coating which provides chemical resistance for concrete, steel, masonry,
fiberglass pipes and has a quick curing time which allows the pipe to be
returned to service immediately.
• Fast installation and high corrosion resistance
• Provides chemical resistance against all elements that eat away at
underground structures
• Requires man-entry
Force Main Gravity Sewer Manholes Appurtenances
Water Main Other: Tanks, Lift Stations, or anv exposed surfaces
II. Technology Parameters
Service Application
Service Connections
Physicals Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair of Water Mains
Connections need to be plugged during installation.
• Tensile Strength > 2,780 psi
• Tear Strength > 5 80 pli
• Biobased
• Elongation > 115%
• Manning's "n" = 0.01
100 % solids - polyurethane
36 in. and greater on pipes and unlimited on man entry structures
Up to !/2 in. (13 mm) or greater in special applications
Not Available
Operating temperature up to 140°F
Limited by length of the spray hose
Solvent Cleaning (SSPC-SP1) may be necessary for steel. Surfaces to be
treated must be cleaned of all oil, grease, rust, scale, deposits and other
debris or contaminants. All resins, including SprayShield Green® I,
A-59
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Technology/Method
Sprayroq SprayShield Green® I/Spray-On Polyurethane Coating
require a clean and dry substrate for optimal performance.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
See website for complete list
50 year design life
Per Manufacturer's Guidelines
After the A and B components are mixed, the polyurethane begins to gel
in about 8 to 12 seconds, with a tack free condition after one minute.
Within 30 to 60 minutes, the initial cure is completed and the structure is
capable of accepting flow while the complete curing continues for the
next 4 to 6 hours.
Licensed Installers (Sprayroq Certified Partners) are trained in proper
substrate cleaning and preparation.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Can be cleaned with standard cleaning equipment
Surface preparation per Manufacturer's Guidelines
V. Costs
Key Cost Factors
Case Study Costs
• Polyurethane materials
• Entry and exit access points
• Amount of surface preparation
Corrosion only $200-3 00/vertical ft; Structural $300-500+/vertical ft
VI. Data Sources
References
• www.spravroq.net/index.php/en/products/spravshield-ereen-i-
elastomeric-polyurethane
• E-mail correspondence with Jerry Gordon and Chip Johnson
A-60
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Datasheet A-30. Sprayroq SprayWall® Polyurethane Coating
Technology/Method Sprayroq SprayWall®/Spray-On Polyurethane Coating
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Introduced in January 1990 in the U.S.
Over 200,000+ structures repaired/rehabilitated to date (number of water
mains unknown)
Sprayroq, Inc.
248 Cahaba Valley Parkway
Pelham,AL35214
Toll Free: (800) 634-0504
Phone: (205) 957-0020
Fax: (205) 957-0021
Email: info@sprayroq.com
Web: www.spravroq.net
• Wayne Schutz, Assistant Manager
Deny Township, PA
Email: wschutz(®dtma.com
Office: (717) 566-3237, x312, Cell: (717) 497-8026
• Rodney Jones, Construction Program Manager
County of Sarasota, FL
Email: rionesi® scgov.net
Cell: (94 1)232-8295
SprayWall® is a durable, spray-applied 100% VOC-free polyurethane
coating that provides both structural reconstruction and chemical
resistance against all elements that eat away at underground structures.
• Fast installation and high corrosion resistance
• Provides chemical resistance against all elements that eat away at
underground structures
• Requires man-entry
Force Main Gravity Sewer Manholes Appurtenances
Water Main Other: Tanks, Lift stations, or anv exposed surfaces
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Spot Repair of Water Mains
Connections need to be plugged during installation.
• Tensile Strength 7,450 psi
• Compression Strength 19,000 psi
• Flexural Modulus of Elasticity (Short Term) 735,000 psi, (Long
Term 5 19,000 psi).
• Elongation < 3% at break.
• Manning's "n" = 0.0009
100 % solids - polyurethane
36 in. and greater on pipes and unlimited on man entry structures
Up to 1 in. (25.4 mm) or greater in special applications
400 psi @ 250 mils (per LA Tech 2009 study)
Operating temperature up to 140°F
Limited by length of the spray hose
Complete capability to handle hydrostatic loading if required. Solvent
Cleaning (SSPC-SP1) may be necessary for steel. Surfaces to be treated
A-61
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Technology/Method
Sprayroq SprayWall®/Spray-On Polyurethane Coating
must be cleaned of all oil, grease, rust, scale, deposits and other debris or
contaminants. All resins, including Spray Wall, require a clean and dry
substrate for optimal performance.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
Thickness Design for Structural ASTM F-1216 Appendix XI
50 year design life retaining 72% of Flex Modulus
Per Manufacturer's Guidelines
After the A and B components are mixed, the polyurethane begins to gel
in about 8 to 12 seconds, with a tack free condition after one minute.
Within 30 to 60 minutes, the initial cure is completed and the structure is
capable of accepting flow while the complete curing continues for the
next 4 to 6 hours.
Licensed Installers (Sprayroq Certified Partners) are trained in proper
substrate cleaning and preparation.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Can be cleaned with standard cleaning equipment
Surface preparation per Manufacturer's Guidelines
V. Costs
Key Cost Factors
Case Study Costs
• Polyurethane materials
• Entry and exit access pits
• Amount of surface preparation
Corrosion only $200-3 00/vertical ft; Structural $300-500+/vertical ft
VI. Data Sources
References
• www.sprayroq.net/index.php/en/products/structural-spravwall
• E-mail correspondence with Jerry Gordon and Chip Johnson
• ASCE Pipelines Paper (Steward et al., 2009)
A-62
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Datasheet A-31. Starline® CIPP Lining
Technology/Method Starline® 1000/HPL-W/CIPP
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
For water, 1998 in Europe and 2010 in the U.S.
400 miles installed for water and gas
Starline Trenchless Technology, LLC
1700 South Mount Prospect Rd.
Des Plaines, IL 600 18-1 804
Phone: (847) 544-3428
Cell Phone: (847) 222-3493
Email: mattson@gastechnology.org
Web: www.starlinett.com
Progressive Pipeline Management, Red Bank, New Jersey
Capable of rehabilitating drinking water transmission mains.
• Structural solution
• Can negotiate 45° bends depending on diameter, locations and the
number of bends
• Withstands circumferential pipe fractures
• Bridges corrosion holes up to 2 in.
• Bypass required
• Cannot negotiate bends greater than 45°
• Relies on overall structural integrity of the host pipe
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
CIPP Rehabilitation of Water Mains
Reinstated from inside the pipe
Semi -structural solution
• Polyester woven liner
• Epoxy resin
4 in. to 24 in.
1 mm to 3 mm
Up to 150 psi (250 psi for gas)
Up to 78°F
Up to 1,800 ft (depending on installation equipment)
Same day reconnection for force mains is possible
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
• Meets KTW and DVGW W270 Compliant in Germany
• NSF/ANSI Standard 6 1 Certification Applied For
• ASTM F-2207, DIN 30658-1, DVGW VP 404, and DVGW W
330(E)
50 years
• DVGW G 478 and DVGW GW 327(E)
The liner has to be pressed through calibrated rollers before it is pushed
into the pipe. Liner is then wound on a pressure drum and bolted into an
inversion cone which it then attached to the host pipe. The liner is then
forced to invert inside the host pipe and the process ends when the liner
reaches the catch basket. The liner is then cured via hot water.
A-63
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Technology/Method
QA/QC
Starline® 1000/HPL-W/CIPP
After installation the liner is tested under pressure.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
No welding on potable water steel pipelines
V. Costs
Key Cost Factors
Case Study Costs
• Materials: liner, resin, fittings, valves and hydrants
• Mobilization
• Bypass system
• Entry and exit access pits
• Cleaning and inspection
• Site restoration
Article in Underground Construction Magazine (Huttemann and Mattson,
2009)
VI. Data Sources
References
• www.starlinett.com/products/index.html
• Email correspondence with Brian Mattson
A-64
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Datasheet A-32. Subterra ELC 257-91 Epoxy Lining
Technology/Method Subterra ELC 257-91/Spray-On Epoxy Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Late 1990s in North America, Early 1990s in the UK
More than 250,000 gallons (850,000 liters) supplied
Daniel Contractors Limited (Subterra Division)
Lyncastle Way, Appleton Thorn
Warrington, Cheshire WA4 4ST
Phone +44 0 (192) 586-0666
Fax: +44 0(192) 586-0504
Email: infoi® subterra.co.uk
Web : www . subterra. co .uk/subterra.php ?page=home
• Bucks County W&S Authority, Philadelphia, PA
• City of Pierrefonds, Canada
• City of Minneapolis, MN
• CityofHalton,ON, CN
• Montreal North, Quebec, CN
• Peterborough, ON, CA
ELC 257/91 is a second generation epoxy resin lining material, specially
formulated to give a high performance coating with improved durability
for water industry in-situ lining applications. Provides a durable,
corrosion-resistant barrier layer over the surface to be protected.
• Thin, smooth coating enhances flow capacity of previously corroded
mains enabling pressure reduction to be readily achieved.
• Does not affect pH of conveyed water.
• Does not block customer service connections during application.
• Unable to negotiate 45° bends
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Lining Rehabilitation of Water Mains
Need to be inspected after lining to ensure they have not been plugged.
Non-structural (for pipeline internal corrosion protection)
Solvent free epoxy resin base, with added hardener technology
4 in. to 24 in.
0.039 in. to 0.059 in., depending on diameter
Not Applicable
37°Fto 100°F(3°Cto40°C)
Up to 650 ft (200 m)
Not Applicable
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
NotNSF/ANSI Standard 61 Certified
Complies fully with Water UK's "In-situ Resin Spray Lining -
Operational Requirements and Code of Practice"
30 to 50 years
Contractors must carry out a lining trial supervised by an authorized
independent assessor.
The mixed resin is applied by a centrifugal spray lining machine. The
A-65
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Technology/Method
QA/QC
Subterra ELC 257-91/Spray-On Epoxy Lining
thickness of the coating is controlled by the resin flow rate and the
forward speed of the machine. The resin base and hardener are fed
through separate hoses and are combined in a static mixer just behind the
spray head. The resin is applied to the prepared internal surface of the
pipe, forming a thick coating, preventing water penetration and corrosion.
Manufactured under a quality assurance system registered to EN ISO
9002.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Soft swab to remove sediment/deposits arising from supply, as required.
Lined pipe can be drilled and tapped using conventional tools with sharp
bits. Cut lined pipe preferably with disc cutter. If necessary, repair any
lining damage using ELC 257/91 patch repair kits.
V. Costs
Key Cost Factors
Case Study Costs
• Epoxy resin materials
• Spraying equipment
• Entry and exit access pits
• Cleaning equipment
$17/ft on 4 in. to 6 in. mains in large-scale lining programs
VI. Data Sources
References
• www. subterra.co.uk/subterra.php ?paae=Polvurethane and Epoxv
Resins
• NASTT No-Dig Article (Hoffman and Warren, 1 999)
• Email correspondence with John De Rosa and Norman Howell
A-66
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Datasheet A-33. Subterra Fast-Line Plus™ Polyurethane Lining
Technology/Method Subterra Fast-Line Plus™/Spray-On Polyurethane Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
2004
15,000 ft (4,500 m) low-build lining
30,000 ft (9,000 m) high-build lining
Daniel Contractors Limited (Subterra Division)
Lyncastle Way, Appleton Thorn
Warrington, Cheshire WA4 4ST
Phone +44 0 (192) 586-0666
Fax: +44 0(192) 586-0504
Email: info@subterra.co .uk
Web: www . subterra. co .uk
• Municipality of Dijon/Axeo, France
• Vicany Water Company/Combin, Slovakia
• Scottish Water, UK
• South East Water
• Wessex Water, UK
Fast-Line Plus™ is a rapid-setting polyurethane resin that has been
formulated specifically for the in-situ lining of drinking water mains by
centrifugal application. It can be applied equally as a low-build lining, to
solve water quality problems in distribution, as well as a high-build
lining, which can help reduce leakage from corrosion holes and
deteriorated joints. It can be applied from conventional resin spray lining
machines, suitably adapted to store and handle the product. Provides a
durable, corrosion-resistant barrier layer over the surface to be protected.
• Low -build (non-structural) and high-build (semi-structural) linings
can be applied from the same resin spray lining machine without
machine modification or change of material.
• Touch dry in 30 minutes and can be returned to service in 2 hours
• Negligible shrinkage on curing
• Coating provides a corrosion-resistant barrier layer
• Enhances flow capacity of previously corroded mains enabling
pressure reduction to be readily achieved
• Does not affect pH of conveyed water
• Does not block customer service connections during application
• Unable to negotiate 45° bends
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Lining Rehabilitation of Water Mains
Need to be inspected after lining to ensure they have not been plugged.
Non-structural or Semi-structural
Solvent-free isocyanate, and a blend of solvent-free polyols
3 in. to 60 in. (75 mm to 1500 mm)
0.039 in. to 0.276 in. (1 mm to 7 mm) depending on diameter
• Non-Structural - not applicable
• Semi -structural - depends on lining thickness, pipeline pressure and
A-67
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Technology/Method
Temperature Range, °F
Renewal Length, feet
Other Notes
Subterra Fast-Line Plus™/Spray-On Polyurethane Lining
size of corrosion holes, etc.
37°Fto 100°F(3°Cto40°C)
Up to 650 ft (200 m.)
Not Applicable
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NotNSF/ANSI Standard 61 Certified
Complies fully with Water UK's "In-situ Resin Spray Lining -
Operational Requirements and Code of Practice"
30 to 50 years
Contractors must carry out a lining trial supervised by an authorized
independent assessor.
The mixed resin is applied by a centrifugal spray lining machine. The
thickness of the coating is controlled by the resin flow rate and the
forward speed of the machine. The two components are fed through
separate hoses and are combined in a static mixer just behind the spray
head. The resin is applied to the prepared internal surface of the pipe,
forming a thick coating, preventing water penetration and corrosion; high-
build linings can also seal corrosion holes/leaking joints.
Manufactured under a quality assurance system registered to EN ISO
9002.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Soft swab to remove sediment/deposits arising from supply, as required.
Lined pipe can be drilled and tapped using conventional tools with sharp
bits. Cut lined pipe preferably with disc cutter. If necessary, repair any
lining damage using ELC epoxy patch repair kits.
V. Costs
Key Cost Factors
Case Study Costs
• Polyurethane resin materials
• Cleaning equipment
• Spraying equipment
• Entry and exit access pits
$17/ft on 4 in. to 6 in. mains in large-scale lining programs
VI. Data Sources
References
• www. subterra.co.uk/subterra.php ?paae=Polvurethane and Epoxv
Resins
• ISTT No-Dig Article (Howell and De Rose, 2000)
• Email correspondence with Norman Howell
A-68
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Datasheet A-34. Subterra Rolldown Process
Technology/Method
Subterra Rolldown/Reduced Diameter Pipe
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1986
Over 280 miles (450 km) installed worldwide
Daniel Contractors Ltd. (Subterra Division)
Lyncastle Way, Appleton Thorn
Warrington, Cheshire WA4 4ST
Phone +44 0 (192) 586-0666
Fax: +44 0(192) 586-0504
Email: infoi® subterra.co.uk
Web : www . subterra. co .uk/subterra.php ?page=home
• Client: Aziend Mediterranea Gas Acqua (AMGA)
Site: Via Gramsci, Genoa, Italy
• Consolidated Edison/PIM Corporation, NJ
• LILCO/PIM Corporation, NJ
Recommended for the following objectives:
• Where the pipeline to be renovated is structurally unsound or a liner
is needed to correct leakage or bursting.
• When pipelines are suffering from water quality problems, corrosion,
pitting & perforation and joint leakage.
• When there is a need to reduce disturbance to the surrounding area.
• Where bore capacity is to be maximized.
• Ambient temperature process - no heat required
• Low winching loads and reversion procedure minimize the residual
stresses in the liner after installation
• Close-fit of lining maximizes carrying capacity
• Smooth bore of PE liner pipe minimizes friction
• Solves pipeline leakage and water quality problems arising from
internal pipeline corrosion
• Bypass required
• Cannot negotiate bends greater than 1 1 .25°
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas and Industrial
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Reduced Diameter Pipe Rehabilitation of Water Mains
Service connections have to be excavated.
Fully-structural
PE 80 or PE 100
4 in. to 20 in. (100 mm to 500 mm)
SDR 11 to 33
Up to 230 psi (16 bar)
As per PE guidelines
1,000 ft to 4,000 ft (300 m to 1200 m) between excavations
• Pipe is reduced in diameter up to 10% before installation.
• Use insert stiffeners to bring liner pipe OD to standard size for
termination with standard electrofusion couplers.
III. Technology Design, Installation, and QA/QC Information
A-69
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Technology/Method
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Subterra Rolldown/Reduced Diameter Pipe
PE 80/PE 100 has NSF/ANSI Standard 61 Certification (overall product
is not listed on the website)
As suggested by PE 80 or PE 100 market guidelines
50 years
As per manufacturer's guidelines
• In the Rolldown process, standard grade PE pipe is pushed through
concentric rollers, which reduce the diameter of the liner pipe to
allow it to be pulled through the host main.
• The liner is then pressurized with the water at an ambient
temperature to revert it to its original size. Thereby minimizing loss
in cross-sectional area and maximizing capacity.
After installation the liner is tested under pressure.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Replacement with standard PE pipe sections and appropriate fittings.
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Entry and exit access pits
• Cleaning and inspection
• Service reconnection
Project costs are dependent on pipe dimensions, length of main to be
rehabilitated, pressure rating of the liner pipe and overall site conditions.
Budget rates for cleaning existing pipeline, PE liner welding, processing
and installation only are as follows:
• Installation > 150 mm but <= 300 mm $55/lf
• Installation > 300 mm but <= 450 mm $90/lf
• Installation > 450 mm but <= 500 mm $110/lf
VI. Data Sources
References
• ConEdison Website
• www. subterra.co.uk/subterra.php ?page=Close Fit and PE Lining
Systems
• Email correspondence with Norman Ho well
A-70
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Datasheet A-35. Subterra Subcoil Hose Lining
Technology/Method Subterra Subcoil/Hose Liner
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1999
Over 60 miles (100 km) installed worldwide
Daniel Contractors Limited (Subterra Division)
Lyncastle Way, Appleton Thorn
Warrington, Cheshire WA4 4ST
Phone +44 0 (192) 586-0666
Fax: +44 0(192) 586-0504
Email: infoi® subterra.co.uk
Web : www . subterra. co .uk/subterra.php ?page=home
• Consolidated Edison Inc. NY/PIM Corporation
• Abu Dhabi Distribution Company/Kurtec, Abu Dhabi
• Anglian Water, UK
• Bournemouth & West Hampshire Water, UK
Subcoil is specifically designed as a low cost rehabilitation system for
distribution mains and small trunk mains. It uses a PE liner which is
factory folded and held in a heart shape. This folding process creates a
clearance allowing the fast installation of the liner pipe into the host pipe
to be renovated.
• Close-fit lining, therefore minimum loss of diameter
• Thin wall and smooth bore - maximizes flow capacity
• Minimal elongation - low winching loads, minimizes residual
stresses after installation
• Process stop-start capability -flexibility of insertion procedures
• Thin wall liner and smooth bore maximizes flow capacity
• Solves pipeline water quality and leakage problems arising from
internal pipeline corrosion
• Bypass required
• Cannot negotiate bends greater than 22.5°
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Hose Lining Rehabilitation of Water Mains
Service Connections have to be excavated.
Structural or Semi -Structural
Polyethylene, PE 80 or PE 100
3 in. to 10 in. (75 mm to 250 mm)
SDR 26 and greater
Up to 90 psi (6 bar)
As per PE guidelines
Up to 4,200 ft (1,300 m) in a single insertion
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
PE 80/PE 100 has NSF/ANSI Standard 61 Certification (overall product
is not listed on the NSF website)
As suggested by PE 80 or PE 100 market guidelines
A-71
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Technology/Method
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Subterra Subcoil/Hose Liner
50 years
As per manufacturer's guidelines
• The PE liner pipe is supplied in coils on a drum.
• The product is dispensed from a small site drum trailer unit.
• The liner pipe is inserted into the pre-cleaned main and then reverted
to a round profile by pressurization with air or water according to the
liner size and application.
• The lining is completed by fitting liner end terminations and
customer service connections designed specifically for this use.
After installation the liner is tested under pressure.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
• Structural: Replacement with standard PE pipe sections and
appropriate fittings.
• Semi-structural: Cut out damaged section, re-terminate liner ends
with proprietary fittings, complete repair with standard PE pipe
sections and appropriate fittings.
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Entry and exit access pits
• Cleaning and inspection
• Service reconnection
Project costs are dependent on pipe dimensions, length of main to be
rehabilitated, pressure rating of the liner pipe and overall site conditions.
Budget rates for cleaning existing pipeline, PE liner welding, processing
and installation only are as follows:
• Installation > 75 mm but <= 100 mm $25/lf
• Installation > 100 mm but <= 150 mm $30/lf
• Installation > 150 mm but <= 225 mm $45/lf
VI. Data Sources
References
• ConEdison Website
• www. subterra.co.uk/subterra.php ?paae=Close Fit and PE Lining
Systems
• Email correspondence with Norman Howell
A-72
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Datasheet A-36. Subterra Subline Fold and Form
Technology/Method Subterra Subline/Fold and Form
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1986
Over 150 miles (250 km) installed worldwide
Daniel Contractors Limited (Subterra Division)
Lyncastle Way, Appleton Thorn
Warrington, Cheshire WA4 4ST
Phone +44 0 (192) 586-0666
Fax: +44 0(192) 586-0504
Email: infoi® subterra.co.uk
Web : www . subterra. co .uk/subterra.php ?page=home
• Annarundel, MD/ PIM Corporation
• Cinnaminson, NJ/PIM Corporation
• Detroit Water, MI
• Middlesex County Water, NJ/PIM Corporation
• New York City-DEP/PIM Corporation
Subline is a close-fit PE lining technique, developed by Subterra, which is
specifically designed for thin wall application.
• Ambient temperature process - no heat required
• Folded cross section reduces friction and winching loads, facilitates
the negotiation of existing pipeline bends, minimizes liner residual
stresses after installation
• Close-fit of lining maximizes carrying capacity
• Smooth bore of PE liner pipe minimizes friction
• Stops water quality problems from internal corrosion
• Bypass required
• Cannot negotiate bends greater than 22.5°
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas and Industrial
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Fold and Form Rehabilitation of Water Mains
Service connections have to be excavated.
Structural or Semi -Structural
Polyethylene, PE 80 or PE 100
3 in. to 60 in. (75 mm to 1500 mm)
SDR 26 to 61
Up to 90 psi (6 Bar)
As per PE guidelines
Up to 3,000 ft (900 m) in a single insertion
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
PE 80/PE 100 has NSF/ANSI Standard 61 Certification (overall product
is not listed on the NSF website)
As suggested by PE 80 or PE 100 market guidelines
50 years
As per manufacturer's guidelines
• Lengths of the PE liner pipe are butt fused into strings of the
A-73
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Technology/Method
QA/QC
Subterra Subline/Fold and Form
appropriate length.
• The liner is then folded cold into a heart shape by pushing it through
the former machine on site, secured with temporary restraining strap
bands and inserted into the precleaned main.
• The liner is pressurized with cold water to revert it back to its
circular form, which breaks the temporary restraining bands.
• The liner end terminations and other connections are then completed
according to requirements using commercially available fittings.
After installation the liner is tested under pressure.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Cut out damaged section, re-terminate liner ends with proprietary fittings,
complete repair with standard PE pipe sections and appropriate fittings.
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Entry and exit access pits
• Cleaning and inspection
• Service reconnection
Project costs are dependent on pipe dimensions, length of main to be
rehabilitated, pressure rating of the liner pipe and overall site conditions.
Budget rates for cleaning existing pipeline, PE liner welding, processing
and installation only are as follows:
• Installation > 150 mm but <= 300 mm $60/lf
• Installation > 300 mm but <= 450 mm $95 /If
• Installation > 450 mm but <= 600 mm $ 120/lf
• Installation > 600 mm but <= 1 000 mm $ 1 5 0/lf
• Over 1000 mm costs are generated on a specific project basis
VI. Data Sources
References
• ConEdison website
• www. subterra.co.uk/subterra.php ?paae=Close Fit and PE Lining
Systems
• Email correspondence with Norman Howell
A-74
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Datasheet A-37. Swagelining™ Reduced Diameter Pipe
Technology/Method
Swagelining™/Reduced Diameter Pipe
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1986
Around 1,500 miles installed to date for water worldwide.
Swagelining Limited
1 Aurora Ave.
Queens Quay, Clydesbank
Glasgow G81 1BF
Phone: +44 (0) 845-180-3444
Email: enquiries@swagelining.com
Web: www.swagelining.com
• Licenser: Murphy Pipeline Contractors, Inc
Contact: Andy Mayer
1 1243-4 St. Johns Industrial Parkway South
Jacksonville, FL 32246
Phone: (904)620-9702
Fax: (904) 620-9703
Email: andvm(a),murphvpipelines.com
A polymer liner that can provide an effective barrier against further
corrosion and deliver a significant life extension to the existing pipeline.
This is a low risk operation in terms of proven technology that also
minimizes pipeline system downtime and usually eliminates the extensive
process of gaining regulatory approvals to build a replacement pipeline.
• Not necessary for the PE liner to depend upon the original pipe for
strength, unless the new PE pipe is being used to replace the old pipe
• When the host pipe is structurally sound, the wall thickness of the
liner may be reduced
• Since sections of PE pipe are butt fused together, there are no joints
where leaks could develop in the future
• Compact, lightweight equipment requires very little setup time
resulting in less disruption, faster installation, and less expense
• It is capable of installing the full range of PE pipe in CI, DI, steel,
and AC pipelines
• There is no shrinkage or curing, and no field chemistry or heating is
required. PE is flexible and highly resistant to chemical attack
• Bypass required
• Limited to 22.5° bends, dependent on length of the bend
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Gas and Mining Slurry
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Reduced Diameter Pipe Rehabilitation of Water Mains
Service connections have to be excavated.
Structural and Semi -structural, as per PE pipe rating guidelines
Polyethylene
2 in. to 60 in.
Any thickness of PE
As per PE pipe rating guidelines
A-75
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Technology/Method
Temperature Range, °F
Renewal Length, feet
Other Notes
Swagelining™/Reduced Diameter Pipe
As per PE pipe rating guidelines
Up to 3,000 ft between excavations.
Standard fittings are available to allow sections of PE-lined pipe to be
easily and securely reconnected to the rest of your water transmission or
distribution system.
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
PE pipe has NSF/ANSI Standard 6 1 Certification (overall product is not
listed on the website)
PE pipes used in the Swagelining process are manufactured to ISO, AGA,
ASTrVT, and API standards, so lines renewed by this process have known
physical properties and an established service life.
As per specification of PE pipe used
As per client specifications
• The Swagelining system uses polyethylene pipe which has an outside
diameter slightly larger than the inside diameter of the pipe to be
lined. After sections of PE are fused together to form a continuous
pipe, the PE pipe is pulled through a reduction die, which
temporarily reduces its diameter.
• This allows the PE pipe to be pulled through the existing pipeline.
After the PE pipe has been pulled completely through the pipe, the
pulling force is removed and the PE pipe returns toward its original
diameter until it presses tightly against the inside wall of the host
pipe. The tight fitting PE liner results in a flow capacity close to the
original pipeline design.
After installation the liner is tested under pressure.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Replacement with standard PE pipe sections.
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Entry and exit access pits
• Cleaning and inspection
• Service reconnection
Not Available
VI. Data Sources
References
• http://swagelining.com/indexl.html
• Communication with Richard Hempson and David Whittle.
A-76
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Datasheet A-38. Tyfo® FibrWrap® Pipe Wrapping
Technology/Method
Tyfo® FibrWrap®/Pipe Wrapping
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
In use since 1980s, pipe rehabilitation system since 1999
100s of pipes since 1999
Fyfe Company, LLC
8380 Miralani Dr.
San Diego, CA 92 126
Phone: (858) 642-0694
Fax: (858) 444-2982
Email: info(®fyfeco.com
Web: www.fyfeco.com
• Gary Schult, Kiewit Western Company, (602) 437-784 1
For 60 in. through 96 in. PCCP pipes
• John Galleher, San Diego County Water Authority, (760) 488-1991
For two 24 ft sections of 96 in. pipe
• Don Lieu, Chief and Robert Diaz, Engineering Project Manager
Utility Design Division, DPW, Bureau of Engineering
Howard County, MD
Cell for Mr. Lieu: (410) 313-6121
Cell for Mr. Diaz: (410) 313-6125
The Tyfo® FibrWrap® Pipe Rehabilitation System is a fiber-reinforced
polymer (FRP) based trenchless technology method for the internal repair,
strengthening and retrofit of corrosion-damaged and distressed large
diameter PCCP, RCP, and steel pressure pipelines used in municipal,
industrial and other applications.
• Allows for trenchless emergency repair of pipelines
• Accommodates rehabilitation of non-uniform geometry
• Restoration of pipelines to original hydrostatic pressure
• Accommodation of increased internal pressure requirements
• Re-establishment of flexural loading capabilities
• Restoration of original external load bearing capacity
• Non-metallic material ensures that corrosion-related damages do not
recur in rehabilitated pipe segments
• Requires highly trained technicians for appropriate installation
• Requires extensive polymer durability studies to predict lifecycle
• Requires dewatering to allow for man-entry for internal repair
• Minimal compression strength added in comparison to tensile
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Tunnels
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Spot Repair of Water Mains
Can be cut to fit around services (design must be taken into account)
Fully structural rehabilitation of only distressed pipe segments
Layers of FRPs (carbon fibers and glass fibers)
24 in. and up
0.1 in. to 0.5 in.
-14 psi (vacuum pressure) to 350 psi.
A-77
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Technology/Method
Temperature Range, °F
Renewal Length, feet
Other Notes
Tyfo® FibrWrap®/Pipe Wrapping
220°F
4 ft and up
Care should be taken during installation to prepare the surface for
bonding and the humidity must be maintained. It is non-corrosive in
nature, rapid installation schedule, long term durability, leaves the internal
diameter of the pipe unchanged, has reduced surface co-efficient of
friction and negligible loss of pipe volume
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
• Biological Growth Support Potential Test (BGSP) cleared
• Long-term durability testing by Metropolitan Water District of
Southern California.
• External loading from soils to pipe should be considered and
designed accordingly.
• ACI 503R-93, ACI 546R-96, ASTM D-695, and ASTM D-3039.
50 to 75 years
ICC Pmg Report and Fyfe Co. QA/QC Manual
By bonding layers of FRPs to the internal surface of a pipeline, advantage
is taken of the inherent strength of these FRP systems which in turn
contribute to significantly increasing both the hoop and axial strengths of
a distressed pipe segment. Application of the layers of fiber composites
virtually leaves the internal diameter of the pipe unchanged and results in
a rapid installation process that is both economical and, most importantly,
fully structural. When necessary, protective coatings can be applied for
aggressive chemical or environmental exposures. Speed of completion is
48 to 72 hours.
Manufacturer's manual includes responsibility sharing on site and in lab,
manufacturing specifications, installation controls, storage, testing,
certifications, calibrations, complaints and inspection.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
• Indicated and provided by Manufacturer.
• Periodic visual inspections.
Top coat renewal.
V. Costs
Key Cost Factors
Case Study Costs
• Distance from repair location to surface access
• Quantity of lineal feet contracted
• Lead time for crews mobilization
• Allotted time for onsite completion of project
• $l,000/lf to $6,000/lf (varies based on design requirements and
project conditions).
• Typically, a 54 in. pipe operating at 150 psi with 12 ft of cover
would be $3,000/lf
VI. Data Sources
References
• www.fibrwrapconstruction.com/pipeline-repairs-rehabilitation.html
• Correspondence via email and a binder provided by Heath Carr.
• Email and phone correspondence with Anna Pridmore.
A-78
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Datasheet A-39. Underground Solutions Duraliner™
Technology/Method Underground Solutions Duraliner™/Expandable PVC
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioners
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
2003
Not Available
Underground Solutions, Inc.
13135 Danielson St., Suite 201
Poway, CA 92064
Phone:(858)679-9551
Fax: (858) 679-9555
Email: info@undergroundsolutions.com
Website: www.undergroundsolutions.com
• Rogers St., Billerica, MA
100 If of 6 in. DR18 Duraliner
UGSI Contact: Martin Barrette - (724) 622-4475
• Cleveland, OH Water Main Replacement Project
600 If of 12 in. DR18 Duraliner
UGSI Contact: Chet Allen - (724) 321-1514
• City of Lima, OH
2,000 If of Duraliner
Duraliner™ is a patented, fully structural pipe rehabilitation system. The
piping system can handle a wide range of system operating pressures and
restore or improve the flow capacity of the host pipe. The PVC pipe
provides a design life of 100+ years.
• Meets system operating pressures
• Fully-structural "stand-alone" system
• It is resistant to water disinfectant induced oxidation and resistant to
hydrocarbon permeation
• Cannot negotiate bends greater than 45°
• Requires excavation at each service for reinstatement
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Fire protection svstems and Industrial
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Sliplining Rehabilitation of Water Mains with Expandable PVC
• Services are tapped with standard fittings and procedures.
• May be tapped with the same saddles used on conventional PVC.
Fully-structural stand-alone system
100% PVC
4 in. to 16 in.
Similar to C900 and C905 PVC pipe
Up to 150 psi
As per PVC guidelines
Up to 500 ft
The improved coefficient of friction can offset the reduction in internal
area to maintain or improve flow.
III. Technology Design, Installation, and QA/QC Information
Product Standards
• NSF/ANSI Standard 61 Certification
• Products meet all of the same current performance standards and
A-79
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Technology/Method
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Underground Solutions Duraliner™/Expandable PVC
health/safety issues as AWWA C900 and C905 PVC pipe
• Conforms to cell classification 12454 as defined in ASTM D-1784
• Meets AWWA C900 or AWWA C905
100 years
Uni-Bell PVC Pipe Manual
• Excavations are performed at entry, exit and service locations.
• The OD of the starting stock is smaller than the ID of the host pipe.
• The pipe is fused to length for the project.
• The fused pipe is inserted into a cleaned, inspected host pipe.
• The pipe is expanded tightly against the interior walls of the host
pipe after insertion.
• Exposed ends of the liner are expanded to standard fitting sizes.
• The new liner is cut to length and reconnected to system.
After installation the liner is tested under pressure.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Replacement with standard pipe sections and appropriate fittings.
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Entry and exit access pits
• Cleaning and inspection
• Service reconnection
Not Available
VI. Data Sources
References
• www.undergroundsolutions.com/duraliner.php
• Business Wire Article (Business Wire, 2003)
A-80
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Datasheet A-40. Underground Solutions Fusible PVC Continuous Sliplining
Technology/Method Fusible C900®, C905®, FPVC®/Cont. Sliplining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
Introduced in 2004
Over 3.5 million linear feet installed since 2004
Underground Solutions, Inc.
13135 Danielson St., Suite 201
Poway, CA 92064
Phone:(858)679-9551
Fax: (858) 679-9555
Email: info@undergroundsolutions.com
Website: www.undergroundsolutions.com
• Zaragosa Boulevard Water Line, El Paso, TX
Sliplining of 16,300 If of 24 in. DR25 using Fusible C905
UGSI Contact: Marty Scanlan - (858)-774-8887
• Homestead Road Water Line, City of Sunnyvale, CA
Sliplining of 1,000 If of 20 in. DR18 using Fusible C905
UGSI Contact: Rob Craw - (925) 577-7566
• Carrolton Pump Station Water Main, New Orleans, LA
Sliplining of 24 in. DR25 using Fusible C905
UGSI Contact: Dan Huffaker - (713) 545-4789
Fusible PVC™ pipe is extruded from a specific formulation of PVC resin
which allows the joints to be butt fused together using UGSFs fusion
process. Industry standard butt fusion equipment is used with some minor
modifications. The resin/compound meets the PVC formulation in PPI
Technical Report #2. With the proprietary formulation, the fused joint
strength is about as strong as the pipe wall. The fusible pipe is made in
DIPS and IPS OD series, as well as Schedule and Sewer sizes.
• Corrosion and abrasion resistant.
• Fully restrained joint -Fusible PVC™ joints allow long lengths of
pipe to be used for HDD, pipe bursting, and sliplining applications.
• Uses standard fittings and service saddles.
• Higher strength enables longer pulls and larger inside diameters.
• Bending radius limitations as per PVC guidelines
• Requires excavation at each service for reinstatement
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Culverts
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Sliplining Rehabilitation of Water Mains with Fusible PVC
• Reinstate with excavation.
• Tapping procedure per Uni-bell standards.
• Fully structural (Class IV)
• Extruded with a unique patent pending formulation that meets PPI
TR-2 range of composition of qualified PVC ingredients.
• Meets ASTM cell classification 12454.
• 4 in. to 12 in. (C900®) and 14 in. to 36 in. (C905®)
• 4 in. to 36 in. (FPVC® potable water pipe other than C900D/C905®)
• Fusible C900®: DR 14 - 25 and Fusible C905®: DR 14 - 5 1
A-81
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Technology/Method
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Fusible C900®, C905®, FPVC®/Cont. Sliplining
• FPVC®: DR 14, 18, 21, 25, 26, 32.5, 41, 51, Sch 40, Sch 80
165 psi - 305 psi (C900®) and 80 psi - 235 psi (C905®)
Up to 140°F (above 73°F, standard internal pressure de-rating factors
apply for long term elevated temperature exposure)
Up to 1,000 ft typically (3,500 ft in a single pull has been completed)
High C-factor at 150
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
NSF/ANSI Standard 61 Certification
AWWA C900, AWWA C905, ASTM, D-1785, ASTM D-2241, ASTM
D-3034, and ASTM F-679
100 years
As per manufacturer's guidelines
• For sliplining, host pipe is cleaned and CCTV.
• Depending on logistics, the pipes can be strung out and the joints
butt fused above grade prior to insertion, or butt fused in the ditch.
• The fused PVC pipe is either winched into the host pipe if sliplining,
or pulled in behind the expansion head when bursting.
• A non-rigid connection from the pipe to the expansion head is used.
• In all installation methods the maximum recommended pull force
and the minimum recommended bend radius must be followed.
• The stock pipe is subjected to all of the normal QC requirements in
AWWA C900/C905, including dimensional conformance, flattening,
acetone immersion, hydrostatic, and burst tests.
• UGSI includes impact, heat reversion, and axial tensile testing as
well. In addition 3rd party labs are used to confirm extrusion results
on key tests prior to shipment.
• The fusion process parameters of pressure and the time are recorded
for each joint using a data logger. Additional parameters such as the
heat plate temperature are also recorded.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Cut out and replace with AWWA PVC of the same OD, using repair
clamps and all standard PVC and DI water works fittings
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Long access pits to accommodate required bend radius
• Service reconnection
Fusible PVC™ was used for a 5, 120 ft directional drill crossing under the
Beaufort River for the Beaufort Jasper Water & Sewer Authority in June
of 2007 and was compared in costs to both steel and HOPE pipe. The
overall project cost $1.7 million and the customer estimated they saved
$400,000 of total cost (materials and installation) by selecting Fusible
PVC™ pipe over the other materials for the drill portion.
VI. Data Sources
References
• www.underaroundsolutions.com/fusible-pvc.php
• Correspondence with Tom Marti, Gary Shepherd, and Chet Allen
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Datasheet A-41. United Pipeline Tite Liner® Reduced Diameter Pipe
Technology/Method United Pipeline Tite Liner®/Reduced Diameter Pipe
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
Introduced in 1985
Over 8,500 miles worldwide for oil, gas and water
United Pipeline Systems
135 Turner Dr.
Durango, CO 8 1303
Phone: (970) 259-0354
Toll Free: (800) 938-6483
Fax: (970) 259-0356
Cell: (303) 506-5230
Email: j hawn@insituform . com
Web: www.unitedpipeline.com
• 5,000 ft of 48 in. along Madison Ave. in New York City
• 30 in. in Austin, Texas
• Decatur, Illinois
United's HOPE pipe lining system spans holes and gaps in the leaking
host pipes, resulting in a continuous HOPE interactive lining system. The
smooth inner surface coupled with the thin, close-fitting HOPE lining
often result in increased flow capacity.
• Minimizes disruption
• Fully structural in some situations
• Corrosion resistant
• Bypass required
• Cannot go through sharp tees or 90° bends (unless sweeping)
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Oil and Gas
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Reduced Diameter Pipe Rehabilitation of Water Mains
Service connections have to be excavated.
In some cases, the HOPE system can act as a fully structural solution
where the host pipe is considered fully deteriorated.
HOPE
2 in. to 52 in.
DR35toDR44
No pressure rating (pressure must be contained by the host-pipe)
192°F (highest to date)
Up to 2,500 ft depending on winching capacity
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
Installation Methodology
NSF/ANSI Standard 61 Certification
Not Available
50 years
• The PE pipe lining has a larger outside diameter than the inside
diameter of the steel pipe it protects. The steel pipeline is cut into
sections that allow for the insertion of the pipe lining system.
Depending on diameter, bends, terrain, and condition of the steel, the
A-83
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Technology/Method
QA/QC
United Pipeline Tite Liner®/Reduced Diameter Pipe
maximum section length (pull-length) can be up to a mile.
• A wire line cable is sent through a section of pipeline and is then
attached to the liner pipe. The wire line pulls the internal pipe lining
system through the roller reduction box which is positioned at the
insertion end of the pipeline section.
• The liner pipe is compressed radially as it passes through the roller
reduction box. This temporary reduction provides sufficient
clearance between the steel pipe and the liner pipe to allow insertion.
• Until the pulling is complete, the liner is under tension, causing it to
remain at a reduced diameter. When the tension is released, the liner
pipe expands and creates a tight fit against the internal wall of the
steel pipe.
• Following relaxation of the inner pipe, the polyethylene flange-
fittings are attached and the line is ready for bolt-up and testing.
After installation the liner is tested under pressure.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Before returning to service, the system shall be disinfected in accordance
with local standards.
Minor damage is repaired by stretching the liner and fusing it together
within a flange.
V. Costs
Key Cost Factors
Case Study Costs
• Liner material
• Installation equipment
• Entry and exit access pits
• Service reconnection
Not Available
VI. Data Sources
References
• www.unitedpipeline.com/content/1 1 1 /municipal, aspx
• www.unitedpipeline.com/content/148/about-tite-liner.aspx
• Email and phone correspondence with Jordan Hawn
A-84
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Datasheet A-42. Wavin Neofit Service Lining
Technology/Method Wavin Neofit Process/Close-Fit Pipe Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Conventional
1998 in Europe
More than 50 installation companies worldwide
Flow-Liner System, Ltd.
4830 North Pointe Drive
Zanesville, Ohio 43701
Phone: (800) 348-0020
International: (740) 453-9387
Web: www.flow-liner.com
• North America (Louisville, KY; Calgary, AB; and Ohio)
• Australia South East Water
• France
The Neofit process is suitable where alternative solutions prove to be
disruptive, such as long side service connections involving road crossings,
congested ground and customer service pipes under drives, fencing,
gardens, etc. An effective barrier is created between water supply and
pipe material. The thin lining provides leak tightness in bridging socket
gaps and holes in the wall, without affecting the performance of the
service. The max hole spanning capability is about 1.5 times the liner
diameter (i.e., 15 mm holes to be covered with a 10 mm tube).
• A typical planned pipe relining from preparation to completion is
about 2-3 hours with 'water off time reduced to about 1 hr
• Apart from an access pit at the main connection point, no disturbance
to the environmental surroundings takes place
• Minimal effect on flow rates
• Water off is required
• Not applicable for water mains
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Close-Fit Pipe Lining of Service Lines
Not applicable
Not-structural
Polyethylene terephthalate
!/2 in. to 1.5 in. (7 mm to 45 mm)
0.006 in. to 0.016 in. (0.15 mm to 0.40 mm)
• Installed in services with pressures 87 psi to 1 16 psi
• Has been exposed to pressures up to 290 psi
Cold water applications only
Up to 110ft
Not Available
III. Technology Design, Installation, and QA/QC Information
Product Standards
Design Standards
Design Life Range
• NSF/ANSI Standard 61-G Certification, EN 14409 and ISO 1 1298,
Australian WSAA, Dutch KPvVA, and French LHRSP
Not Available
50 years
A-85
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Technology/Method
Installation Standards
Installation Methodology
QA/QC
Wavin Neofit Process/Close-Fit Pipe Lining
As per manufacturer's guidelines
• A small flexible tube made of PET material is inserted into the pipe
• Then 85° to 87°C water is run through the lined pipe to inflate it up
to 2.2 times the original size to form a close fitting thin walled liner.
• Once the pipe has expanded, compressed air is run through pipes
until the temperature drops to 50°C.
• The cycle is completed in approximately 30 minutes.
As per manufacturer's guidelines
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
Disinfection of system before putting it back into service.
Not Available
V. Costs
Key Cost Factors
Case Study Costs
• Pipe material and equipment
• Mobilization
• Entry point access pits
• Surface restoration
Not Available
VI. Data Sources
References
• http://overseas.wavin.com/overseasAVavin Neofit.html
• www.nsf.org
• www.flow-liner.com/water linina.html
• Phone and email correspondence with Mike Gonder
• International Article (Elzink, 2006)
A-86
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Datasheet A-43. Aqualiner Melt-in-Place Pipe Lining
Technology/Method Aqualiner/Melt-in-Place Pipe Lining
I. Technology Background
Status
Date of Introduction
Utilization Rates
Vendor Name(s)
Practitioner(s)
Description of Main Features
Main Benefits Claimed
Main Limitations Cited
Applicability
(Underline those that apply)
Emerging
2008 - development trials in Europe
Limited, still in development stage
Aqualiner Ltd
Unit 10, Charnwood Business Park, North Road,
Loughborough, Leicestershire, LEU 1QJ, United Kingdom
Phone: +44 (0) 150-921-0027
Email: info@aqualiner .co .uk
Website: www.aqualiner.co.uk
Three field trials undertaken by Wessex Water
Contact Julian Britton, Manager - Critical Sewers Team
Kingston Seymour STW, Back Lane
ClevedonUKBS216UY
Phone: +44 (0) 127-587-5157
Aqualiner involves inserting a glass fiber reinforced polypropylene sock
into a deteriorated pipe. Once the composite sock has been inserted into
the host pipe, a silicone rubber inflation tube pushes a heated pig through
the composite melting the thermoplastic sock against the pipe. The
inversion bag presses the molten thermoplastic composite sock against
the pipe wall where it cools to form a solid glass reinforced thermoplastic
liner.
• No mixing of chemicals - long shelf life
• Environmentally safe - no releases
• Structural - capable of withstanding internal and external pressure
• Minimizes any loss of capacity since the liner is thin
• Minimizes excavation and disruptions
• Bypass required
• Still in incubation - not commercially released yet
• Not NSF/ANSI 6 1 certified
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Not Applicable
II. Technology Parameters
Service Application
Service Connections
Structural Rating Claimed
Materials of Composition
Diameter Range, inches
Thickness Range
Pressure Capacity, psi
Temperature Range, °F
Renewal Length, feet
Other Notes
Melt-in-Place Pipe Lining Rehabilitation of Water Mains
Open cut or robotically reinstate. Fusion couplings under development
• Class IV (AWWA M28 Manual) fully structural independent liner
• Will conform to the strain corrosion requirements for a GRP sewer
pipe as contained in Table 6 of EN 13566-4:2002 (similar to those in
ASTMD-3262).
Chopped glass fiber and polypropylene
6 in. to 12 in.
3 to 6 mm
Up to 145 psi
23°F to 104°F (-5°C to 40°C)
500 ft for 12 in. pipes
Not Available
III. Technology Design, Installation, and QA/QC Information
A-87
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Technology/Method
Product Standards
Design Standards
Design Life Range
Installation Standards
Installation Methodology
QA/QC
Aqualiner/Melt-in-Place Pipe Lining
None at this time. Closest applicable standard might be EN ISO 15874 -
Polypropylene for hot and cold water installations
None at this time. Closest applicable standard might be EN 13566-
4:2002, Plastic piping systems for renovation of underground sewerage
networks (CIPP).
50 years
None at this time.
• The host pipe is first cleaned and then CCTV inspected for location
of laterals and fittings.
• The liner can be installed through a bend of up to 45 degrees.
• A pig is inserted into the thermoplastic composite sock. The pig
heats the polypropylene until it melts.
• An inversion drum deploys a silicone rubber inflation tube which
pushes the pig through the pipe. Application rate is 1.5 ft/min.
• The inversion bag also presses the molten thermoplastic composite
sock against the pipe wall where it cools to form a solid
homogeneous thermoplastic composite liner. Pressure in the
inversion bag is kept at 45 psi (3 bar).
• The inversion bag is deflated and removed after the liner cools.
• After installation, CCTV inspection should be performed on the
liner. The internal surface is to be smooth, clean, and free from
scoring, cavities, wrinkling, and other surface defects.
• Samples of the formed liner should be checked for thickness, short-
term flexural modulus, and tensile strength, but as yet no design
values have been provided.
IV. Operation and Maintenance Requirements
O&M Needs
Repair Requirements for
Rehabilitated Sections
None identified yet.
Remove host pipe and Aqualiner and replace with new pipe section and
tie back to existing host pipe with repair clamps.
V. Costs
Key Cost Factors
Case Study Costs
• Mobilization one fully equipped installation truck, compressor, and
generator.
• Cleaning and inspection
• Materials: liner tuber, resin, and fittings
• Bypass system
• Entry and exit access pits
• Service reinstatement
• Site restoration
Estimated Cost ~ $35-$40/ft
VI. Data Sources
References
• www.aqualiner.co.uk
• ISTT No-Dig Paper (Boyce and Downey, 2010)
• Aqualiner Product Specification Issue 3 (Aug. 12, 2007)
A-8
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