Environmental Technology
Verification Report
Baghouse Filtration Products
Donaldson Company, Inc.
Tetratec # 6255 Filtration Media
Prepared by
RTI International
ETS, Incorporated
EPA Cooperative Agreement CR 831911-01
EPA Project Manager
Michael Kosusko
Air Pollution Prevention and Control Division
National Risk Management Research Laboratory
Office of Research and Development
U.S. Environmental Protection Agency
Research Triangle Park, NC 27711
September 2007
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THE ENVIRONMENTAL TECHNOLOGY VERIFICATION
PROGRAM /}
EIV
U.S. Environmental Protection Agency
HRTI
INTERNATIONAL
ETV Joint Verification Statement
TECHNOLOGY TYPE: BAGHOUSE FILTRATION PRODUCTS
APPLICATION:
CONTROL OF PM2.5 EMISSIONS BY BAGHOUSE
FILTRATION PRODUCTS
TECHNOLOGY NAME: Tetratec #6255 Filtration Media
COMPANY:
ADDRESS:
WEB SITE:
E-MAIL:
Donaldson Company, Inc.
85 Railroad Drive PHONE: (215) 396-8349
Ivyland,PA 18974 FAX: (215)396-8308
http://www.donaldson.com
rpennepa@.mail.donaldson.com
The U.S. Environmental Protection Agency (EPA) has created the Environmental Technology
Verification (ETV) Program to facilitate the deployment of innovative or improved environmental
technologies through performance verification and dissemination of information. The goal of the ETV
Program is to further environmental protection by accelerating the acceptance and use of improved and
cost-effective technologies. ETV seeks to achieve this goal by providing high-quality, peer-reviewed data
on technology performance to those involved in the design, distribution, financing, permitting, purchase,
and use of environmental technologies.
ETV works in partnership with recognized standards and testing organizations; stakeholder groups, which
consist of buyers, vendor organizations, permitters, and other interested parties; and with the full
participation of individual technology developers. The program evaluates the performance of innovative
technologies by developing test plans that are responsive to the needs of stakeholders, conducting field or
laboratory tests (as appropriate), collecting and analyzing data, and preparing peer-reviewed reports. All
evaluations are conducted in accordance with rigorous quality assurance protocols to ensure that data of
known and adequate quality are generated and that the results are defensible.
The Air Pollution Control Technology Verification Center (APCT Center) is operated by RTI
International (RTI), in cooperation with EPA's National Risk Management Research Laboratory. The
APCT Center evaluates the performance of baghouse filtration products (BFPs) used primarily to control
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Donaldson Company, Inc. 6255
PM2 5 emissions (particles 2.5 um and smaller in aerodynamic diameter). This verification statement
summarizes the test results for Donaldson Company, Inc.'s Tetratec # 6255 filtration media.
VERIFICATION TEST DESCRIPTION
All tests were performed in accordance with the APCT Center Generic Verification Protocol for
Baghouse Filtration Products, available at http://www.epa.gov/etv/pdfs/vp/05_vp_brp.pdf The protocol
is based on and describes modifications to the equipment and procedures described in Verein Deutscher
Ingenieure (VDI 3926, Part 2), Testing of Filter Media for Cleanable Filters under Operational
Conditions, December 1994. The VDI document is available from Beuth Verlag GmbH, 10772 Berlin,
Germany. The protocol also includes requirements for quality management, quality assurance,
procedures for product selection, auditing of the test laboratories, and test reporting format.
Outlet particle concentrations from a test fabric were measured with an impactor equipped with
appropriate substrates to filter and measure PM2 5 within the dust flow. Outlet particle concentrations
were determined by weighing the mass increase of dust collected in each impactor filter stage and
dividing by the gas volumetric flow through the impactor.
Particle size was measured while injecting the test dust into the air upstream of the baghouse filter
sample. The test dust was dispersed into the flow using a brush-type dust feeder. The particle size
distributions in the air were determined both upstream and downstream of the test filter fabric to provide
accurate results for penetration through the test filter of PM2 5. All tests were performed using a constant
18.4 ± 3.6 g/dscm (8.0 ± 1.6 gr/dscf) loading rate, a 120 ± 6.0 m/h (6.6 ± 0.3 fpm) filtration velocity
[identical to gas-to-cloth ratio (G/C*)], and aluminum oxide test dust with a measured mass mean
aerodynamic diameter maximum of 1.5 um (average of three impactor runs). All baghouse filtration
products are tested in their initial (i.e., clean) condition.
Each of the three test runs consisted of the following segments:
• Conditioning period - 10,000 rapid-pulse cleaning cycles,
• Recovery period - 30 normal-pulse cleaning cycles,
• Performance test period - 6-hour filter fabric test period with impactor.
VERIFIED TECHNOLOGY DESCRIPTION
The Donaldson Company, Inc. provided the following information about their product. The Tetratec #
6255 filtration media is a 22 ounces per square yard woven fiberglass with Tetratex
polytetrafluoroethylene (PTFE) membrane. Figure 1 is a photograph of the fabric. The sample material
was received as nine 46 x 91 cm (18 x 36 in.) swatches marked with the manufacturer's model number,
year, and month of manufacture, and cake side. Three of the swatches were selected at random for
preparing three test specimens 150 mm (5.9 in.) in diameter.
VERIFICATION OF PERFORMANCE
Verification testing of the Donaldson Company, Inc., Tetratec # 6255 filtration media was performed
during April 12-19, 2007, at the test facility of ETS, Incorporated, 1401 Municipal Road, Roanoke, VA
24012. Test conditions are listed in Table 1. The overall test results summarized in Table 2 are the
averages of three individual tests.
*Filtration velocity and gas-to-cloth ratio are used interchangeably and are defined as the gas flow rate divided by
the surface area of the cloth.
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Donaldson Company, Inc. 6255
Donaldson
PC#6255
22opsy Woven Fiberglass with
Tetratex Membrane
Figure 1. Photograph of Donaldson Company, Inc.'s 6255 Filtration Media
Table 1. Test Conditions for Baghouse Filtration Products Brand/Model:
Donaldson Company, Inc.'s 6255 Filtration Media
Test parameter
Dust concentration
Filtration velocity (G/C)
Pressure loss before cleaning
Tank pressure
Valve opening time
Air temperature
Relative humidity
Total raw gas stream flow rate
Sample gas stream flow rate
Number of filtration cycles
• During conditioning period
During recovery period
Performance test duration
Value
18.4 ± 3.6 g/dscm (8.0 ± 1.6 gr/dscf)
120 ± 6 m/h (6.6 ± 0.3 fpm)
1,000 ± 12 Pa (4 ± 0.05 in. w.g.)
0.5 ± 0.03 MPa (75 + 5 psi)
50 ± 5 ms
25 ± 2 °C (77 + 4 °F)
50 ± 10 %
5.8±0.3m3/h(3.4±0.2cfm)
1. 13 ± 0.06 m3/h (0.67 ± 0.03 cfm)
10,000 cycles
30 cycles
6h± Is
111
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Donaldson Company, Inc. 6255
Table 2. Baghouse Filtration Product Three-run Average Test
Results for Donaldson Company, Inc.'s Fabric 6255 Filtration Media
Verification parameter
Outlet particle concentration at standard conditions3
PM2 5, g/dscm
(gr/dscf)
Total mass, g/dscmb
(gr/dscf)
Average residual pressure drop, cm w.g. (in. w.g.)
Initial residual pressure drop, cm w.g. (in. w.g.)
Residual pressure drop increase, cm w.g. (in. w.g.)
Filtration cycle time, s
Mass gain of test sample filter, g (gr)
Number of cleaning cycles
At verification test
conditions
0.000021
(0.000009)
0.000021
(0.000009)
3.47(1.37)
3.31(1.30)
0.30(0.12)
136
0.11 (1.65)
159
NA = Not applicable - values shown are for three tests.
a Standard conditions: 101.3 kPa (14.7 psia) and 20 °C (68 °F). One or more of the impactor substrate weight
changes for these results were near the reproducibility of the balance.
b Total mass includes the mass of PM2 5 and larger particles that passed through the fabric.
The APCT Center quality assurance officer has reviewed the test results and the quality control data and
has concluded that the data quality objectives given in the generic verification protocol and test/QA plan
have been attained.
This verification statement addresses five aspects of filter fabric performance: filter outlet PM2 5
concentration, filter outlet total mass concentration, pressure drop (AP), filtration cycle time, and mass
gain on the filter fabric. Users may wish to consider other performance parameters such as temperature,
service life, and cost when selecting a filter fabric for their application.
In accordance with the generic verification protocol, this verification statement is applicable to filter
media manufactured between the signature date of the verification statement and 3 years thereafter.
IV
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Donaldson Company, Inc. 6255
signed by Sally Gutierrez 9/14/07 signed by Andrew R. Trenholm 9/6/07
Sally Gutierrez Date Andrew R. Trenholm Date
Director Director
National Risk Management Research Laboratory APCT Center
Office of Research and Development RTI International
United States Environmental Protection Agency
NOTICE: ETV verifications are based on an evaluation of technology performance under specific, predetermined
criteria and the appropriate quality assurance procedures. EPA and RTI make no express or implied warranties as to
the performance of the technology and do not certify that a technology will always operate as verified. The end user
is solely responsible for complying with any and all applicable federal, state, and local requirements. Mention of
commercial product names does not imply endorsement.
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Donaldson Company, Inc. 6255
Notice
This document was prepared by RTI International (RTI) and its subcontractor ETS, Inc. (ETS) with
partial funding from Cooperative Agreement No. CR 831911-01 with the U.S. Environmental Protection
Agency (EPA). The document has been subjected to RTI/EPA's peer and administrative reviews and has
been approved for publication. Mention of corporation names, trade names, or commercial products does
not constitute endorsement or recommendation for use of specific products.
RTI International is a trade name of Research Triangle Institute.
VI
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Donaldson Company, Inc. 6255
Foreword
The Environmental Technology Verification (ETV) Program, established by the U.S. Environmental
Protection Agency (EPA), is designed to accelerate the development and commercialization of new or
improved technologies through third-party verification and reporting of performance. The goal of the
ETV Program is to verify the performance of commercially ready environmental technologies through the
evaluation of objective and quality-assured data so that potential purchasers and permitters are provided
with an independent and credible assessment of the technology that they are buying or permitting.
The Air Pollution Control Technology Verification Center (APCT Center) is part of the EPA's ETV
Program and is operated as a partnership between RTI International (RTI) and EPA. The center verifies
the performance of commercially ready air pollution control technologies. Verification tests use approved
protocols, and verified performance is reported in verification statements signed by EPA and RTI
officials. RTI contracts with ETS, Inc. (ETS) to perform verification tests on baghouse filtration
products, including filter media.
Baghouses are air pollution control devices used to control particulate emissions from stationary sources
and are among the technologies evaluated by the APCT Center. The APCT Center developed (and EPA
approved) the Generic Verification Protocol for Baghouse Filtration Products to provide guidance on
these verification tests.
The following report reviews the performance of Donaldson Company, Inc.'s Tetratec # 6255 filtration
media. ETV testing of this technology was conducted during April 2007 at ETS. All testing was
performed in accordance with an approved test/QA plan that implements the requirements of the generic
verification protocol at the test laboratory.
vn
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Donaldson Company, Inc. 6255
Availability of Verification Statement and Report
Copies of this verification report are available from:
• RTI International
Engineering and Technology Unit
P.O. Box 12194
Research Triangle Park, NC 27709-2194
• U.S. Environmental Protection Agency
Air Pollution Prevention and Control Division (E343-02)
109 T. W. Alexander Drive
Research Triangle Park, NC 27711
Web Site:
http://www.epa.gov/etv/verifications/verification-index.html (electronic copy)
Vlll
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Donaldson Company, Inc. 6255
Table of Contents
Page
ETV Joint Verification Statement [[[ i
Notice [[[ vii
Foreword [[[ viii
Availability of Verification Statement and Report [[[ ix
List of Figures [[[ xi
List of Tables [[[ xi
List of Abbreviations and Acronyms [[[ xii
Acknowledgments [[[ xiv
Section 1. Introduction [[[ 1
Section 2. Verification Test Description [[[ 1
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Donaldson Company, Inc. 6255
List of Figures
Page
Figure 1. Diagram of FEMAtest apparatus 6
List of Tables
Table 1. Summary of Control Test Results 4
Table 2. Summary of Verification Results For Donaldson Company, Inc.'s Fabric 6255 8
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Donaldson Company, Inc. 6255
APCT Center
APPCD
BFP
cfm
cm
cm w.g.
dia.
AP
dscmh
EPA
ETS
ETV
FEMA
rpm
ft3
g
G/C
gr
gr/dscf
g/dscm
g/h
g/m2
hr
in.
in. w.g.
kg/m2
kPa
m
mbar
min
m/h
m3/h
List of Abbreviations and Acronyms
Air Pollution Control Technology Verification Center
Air Pollution Prevention and Control Division
baghouse filtration product
cubic feet per minute
centimeters
centimeters of water gauge
diameter
pressure drop
dry standard cubic meters per hour
U.S. Environmental Protection Agency
ETS, Incorporated
environmental technology verification
Filtration Efficiency Media Analyzer
feet per minute
cubic feet
grams
gas-to-cloth ratio (filtration velocity)
grains
grains per dry standard cubic foot
grams per dry standard cubic meter
grams per hour
grams per square meter
hours
inches
inches of water gauge
kilograms per square meter
kilopascals
meters
millibars
minutes
meters per hour
cubic meters per hour
XI
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Donaldson Company, Inc. 6255
mm millimeters
MPa megapascals
ms milliseconds
NA not applicable
Pa pascals
PM particulate matter
PM2 5 particulate matter 2.5 micrometers in aerodynamic diameter or smaller
psi pounds per square inch
psia pounds per square inch absolute
PTFE polytetrafluoroethylene
QA quality assurance
QC quality control
RTI RTI International
s seconds
scf standard cubic feet
scfm standard cubic feet per minute
VDI Verein Deutscher Ingenieure
w.g. water gauge
ug micrograms
um micrometers
°C degrees Celsius
°F degrees Fahrenheit
°R degrees Rankine
xn
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Donaldson Company, Inc. 6255
Acknowledgments
The authors acknowledge the support of all those who helped plan and conduct the verification activities.
In particular, we would like to thank Michael Kosusko, EPA's Project Manager, and Paul Groff, EPA's
Quality Assurance Manager, both of EPA's National Risk Management Research Laboratory in Research
Triangle Park, NC. Finally, we would like to acknowledge the assistance and participation of Donaldson
Company, Inc. personnel who supported the test effort.
For more information on Donaldson Company, Inc.'s filtration media, contact:
Robert Pannepacker
Donaldson Company, Inc.
85 Railroad Drive
Ivyland, PA 18974
(215) 396-8349
rpennepa@mail.doanldson.com
For more information on verification testing of baghouse filtration products, contact:
Andrew Trenholm
RTI International
P.O. Box 12194
Research Triangle Park, NC 27709-2194
(919)316-3742
atrenholm(S),rti .org
xni
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Donaldson Company, Inc. 6255
SECTION 1
INTRODUCTION
This report reviews the filtration and pressure drop (AP) performance of Donaldson Company, Inc.'s
Tetratec # 6255 filtration media. Environmental Technology Verification (ETV) testing of this
technology/product was conducted during a series of tests in April 2007, by ETS, Inc. (ETS), under
contract with the Air Pollution Control Technology Verification Center (APCT Center). The objective of
the APCT Center and the ETV Program is to verify, with high data quality, the performance of air
pollution control technologies. Control of fine particle emissions from various industrial and electric
utility sources employing baghouse control technology is within the scope of the APCT Center. The
APCT Center program area was designed by RTI International (RTI) and a technical panel of experts to
evaluate the performance of particulate filters for fine particle (PM2 5) emission control. Based on the
activities of this technical panel, the Generic Verification Protocol for Baghouse Filtration Products was
developed. This protocol was chosen as the best guide to verify the filtration performance of baghouse
filtration products (BFPs). The specific test/quality assurance (QA) plan for the ETV test of the
technology was developed and approved in May 2000 with an approved update in February 2006. The
goal of the test was to measure filtration performance of both PM25 and total PM as well as the pressure
drop characteristics of the Donaldson Company, Inc. technology identified above.
Section 2 documents the procedures and methods used for the test and the conditions over which the test
was conducted. A description of the Donaldson Company, Inc.'s Tetratec # 6255 filtration media is
presented in Section 3. The results of the test are summarized and discussed in Section 4, and references
are presented in Section 5.
This report contains summary information and data from the test as well as the verification statement.
Complete documentation of the test results is provided in a separate data package and audit of data quality
report. These reports include the raw test data from product testing and supplemental testing, equipment
calibrations results, and QA and quality control (QC) activities and results. Complete documentation of
QA/QC activities and results, raw test data, and equipment calibrations results are retained in ETS's files
for seven years.
SECTION 2
VERIFICATION TEST DESCRIPTION
The baghouse filtration products were tested in accordance with the APCT Center Generic Verification
Protocol for Baghouse Filtration Products1 and the Test/QA Plan for the Verification Testing of
Baghouse Filtration Products2 This protocol incorporated all requirements for quality management, QA,
procedures for product selection, auditing of the test laboratories, and reporting format. The Generic
Verification Protocol (GVP) describes the overall procedures to be used for verification testing and
defines the data quality objectives. The values for inlet dust concentration, raw gas flow rate, and
filtration velocity used for current verification testing have been revised in consultation with the technical
panel since posting of the GVP. These revisions are documented in Section 4.1. The test/QA plan details
how the test laboratory at ETS will implement and meet the requirements of the GVP.
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Donaldson Company, Inc. 6255
2.1 DESCRIPTION OF THE TEST RIG AND METHODOLOGY
The tests were conducted in ETS's Filtration Efficiency Media Analyzer (FEMA) test apparatus
(Figure 1). The test apparatus consists of a brush-type dust feeder that disperses test dust into a vertical
rectangular duct (raw-gas channel). The dust feed rate is continuously measured and recorded via an
electronic scale located beneath the dust feed mechanism. The scale has a continuous read-out with a
resolution of 10 g. A radioactive polonium-210 alpha source is used to neutralize the dust electrically
before its entry into the raw-gas channel. An optical photo sensor monitors the concentration of dust and
ensures that the flow is stable for the entire duration of the test. The optical photo sensor does not
measure concentration. A portion of the gas flow is extracted from the raw-gas channel through the test
filter, which is mounted vertically at the entrance to a horizontal duct (clean-gas channel). The clean-gas
channel flow is separated in two gas streams, a sample stream and a bypass stream. An aerodynamic "Y"
is used for this purpose. The aerodynamic "Y" is designed for isokinetic separation of the clean gas with
40 percent of the clean gas entering the sample-gas channel without change in gas velocity. The sample-
gas channel contains an Andersen impactor for particle separation and measurement. The bypass channel
contains an absolute filter. The flow within the two segments of the "Y" is continuously monitored and
maintained at selected rates by adjustable valves. Two vacuum pumps maintain air flow through the raw-
gas and clean-gas channels. The flow rates, and thus the gas-to-cloth ratio (G/C) through the test filter,
are kept constant and measured using mass flow controllers. A pressure transducer is used to measure the
average residual pressure drop of the filter sample. The pressure transducer measures the differential
pressure across the filter samples 3 seconds after the cleaning pulse. The pressure drop measurements are
then averaged as described in Appendix C, Section 4.4.1 of the GVP.1 High-efficiency filters are installed
upstream of the flow controllers and pumps to prevent contamination or damage caused by the dust. The
cleaning system consists of a compressed-air tank set at 0.5 MPa (75 psi), a quick-action diaphragm
valve, and a blow tube [25.4mm (1.0 in.) dia.] with a nozzle [3 mm (0.12 in.) dia.] facing the downstream
side of the test filter.
Mean outlet particle concentration is determined when a portion of the gas flow is extracted from the raw-
gas channel through the test filter, which is mounted vertically at the entrance to a horizontal duct (clean-
gas channel). The clean-gas flow is separated using an aerodynamic "Y" so that a representative sample
of the clean gas flows through an Andersen impactor that determines the outlet particle concentration.
The particle size was measured while a fine dust was injected into the air stream upstream of the filter
fabric sample.
The following series of tests was performed on three separate, randomly selected filter fabric samples:
• Conditioning period,
• Recovery period, and
• Performance test period.
To simulate long-term operation, the test filter was first subjected to a conditioning period, which consists
of 10,000 rapid pulse cleaning cycles under continuous dust loading. During this period, the time
between cleaning pulses is maintained at 3 seconds. No filter performance parameters are measured in
this period.
The conditioning period is immediately followed by a recovery period, which allows the test filter fabric
to recover from rapid pulsing. The recovery period consists of 30 normal filtration cycles under
continuous and constant dust loading. During a normal filtration cycle, the dust cake is allowed to form
on the test filter until a differential pressure of 1,000 Pa (4.0 in. w.g.) is reached. At this point the test
filter is cleaned by a pulse of compressed air from the clean-gas side of the fabric. The next filtration
cycle begins immediately after the cleaning is complete.
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Donaldson Company, Inc. 6255
Performance testing occurs for a 6-hour period immediately following the recovery period (a cumulative
total of 10,030 filtration cycles after the test filter has been installed in the test apparatus). During the
performance test period, normal filtration cycles are maintained and, as in the case of the conditioning and
recovery periods, the test filter is subjected to continuous and constant dust loading.
The filtration velocity (G/C) and inlet dust concentrations are maintained at 120 ± 6 m/h (6.6 ± 0.3 fpm)
and 18.4 ±3.6 g/dscm (8.0 ±1.6 gr/dscf), respectively, throughout all phases of the test.
2.2 SELECTION OF FILTRATION SAMPLE FOR TESTING
Filter fabric samples of Tetratec # 6255 filtration media were supplied to ETS directly from the
manufacturer (Donaldson Company, Inc.) with a letter signed by Robert Pannepacker, senior product
development engineer, Donaldson Company, Inc., attesting that the filter media were selected at random
in an unbiased manner from commercial-grade media and were not treated in any manner different from
the media provided to customers. The manufacturer supplied the test laboratory with nine 46 x 91 cm
(18x36 in.) filter samples. The test laboratory randomly selected three samples and prepared them for
testing by cutting one test specimen of 150 mm (5.9 in.) diameter from each selected sample for insertion
in the test rig sample holder. The sample holder has an opening 140 mm (5.5 in.) in diameter, which is
the dimension used to calculate the face area of the tested specimen.
2.3 CONTROL TESTS
Two types of control tests were performed during the verification test series. The first was a dust
characterization, which is performed monthly. The reference dust used during the verification tests was
Pural NF aluminum oxide dust. The Pural NF dust was oven dried for 2 hours and sealed in an airtight
container prior to its insertion into the FEMA apparatus. The dust characterization results had to meet the
requirements of a 1.5 ± 1.0 um maximum mass mean diameter and between 40 and 90 percent less than
2.5 um to continue the verification test series.
The second control test, the reference value test, is performed quarterly using the reference fabric and the
FEMA apparatus. The reference value test determines the weight gain of the reference fabric as well as
the maximum pressure drop. The results of the test verify that the FEMA apparatus is operating
consistently within the required parameters. Reference values tests are conducted and the average fabric
maximum pressure drop must be 0.60 cm w.g. ± 40% and the fabric weight gain average must be 1.12 g ±
40%.
The results of the control tests are summarized in Table 1.
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Donaldson Company, Inc. 6255
Table 1. Summary of Control Test Results
Mass mean diameter, um
% Less than 2.5 um
Weight gain, g
Maximum AP, cm w.g.
Requirement
1.5 ± 1.0
40 to 90%
1.12 ±40%
0.60 ± 40%
Measured value
0.92
76.91
0.97
0.49
Met requirements?
Yes
Yes
Yes
Yes
AP = pressure drop.
Three reference value control test runs were conducted.
2.4 ANALYSIS
The equations used for verification analysis are described below.
Af = Exposed area of sample filter, m2
Cds = Dry standard outlet particulate concentration of total mass, g/dscm
C2.5ds = Dry standard outlet particulate concentration of PM2 5, g/dscm
d = Diameter of exposed area of sample filter, m
Fa = Dust feed concentration corrected for actual conditions, g/m3
Fs = Dust feed concentration corrected for standard conditions, g/dscm
G/C = Gas-to-cloth ratio, m/h
Mt = Total mass gain from Andersen impactor, g
M2 5 = Total mass gain of particles equal to or less than 2.5 urn diameter from Andersen impactor, g.
This value may need to be linearly interpolated from test data.
N = Number of filtration cycles in a given performance test period
Pavg = Average residual pressure drop, cm w.g.
Pj = Residual pressure drop for ith filtration cycle, cm w.g.
Ps = Absolute gas pressure as measured in the raw-gas channel, mbar
Qa = Actual gas flow rate, m3/h
Qds = Dry standard gas flow rate, dscmh
Q2.5ds = Dry standard gas flow rate for 2.5 urn particles, dscmh
Qst = Standard gas flow rate for a specific averaging time, t, dscmh
t = Specified averaging time or sampling time, s
tc = Average filtration cycle time, s
Ts = Raw-gas channel temperature, °F
wf = Weight of dust in feed hopper following specified time, g. Because of vibrations causing
short-term fluctuations to the feed hopper, it is recommended that this value be measured as a
1-min average.
w; = Weight of dust in feed hopper at the beginning of the specified time, g. Because of vibrations
causing short-term fluctuations to the feed hopper, it is recommended that this value be
measured as a 1-min average.
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Donaldson Company, Inc. 6255
Conversion factors and standard values used in the equations are listed below.
460 = 0 °F, in °R
1,013 = Standard atmospheric pressure, mbar
528 = Standard temperature, °R
Area of Sample Fabric, Af
Af=(:r*d2)/4
Actual Gas Flow Rate, Qa
Qa = QdS * rrr. + 460)* 1013 1
L Ps * 528 J
Gas-to-Cloth Ratio, G/C
G/C = Qa/Af
Standard Dust Feed Concentration, Fs, for a specified time, t
F, = (wi-Wf)/(Qst*t)
Actual Raw Gas Dust Concentration, Fa
Fa = Fs * [P; + 460)* 1013 "]
[ " Ps * 528 J
Dry Standard Clean Gas Particulate Concentration, Total Mass, Cds
Cds = H / [ Qds * t * (1 - %H2O/100) ]
Dry Standard Clean Gas Particulate Concentration, PM2 5 C2.5ds
C2.5ds = M2 5 / [ Q2.5ds * t * (1 - %H2O/100) ]
Filtration Cycle Time, tc
tc = t/N
Average Residual Pressure Drop, P
avg
Pavg =
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Donaldson Company, Inc. 6255
DUST FEED FROM EXTERNAL HOPPER
DUST CHARGE NEUTRALIZER
RECTANGULAR CHANNEL
111 x 292 mm (4-3/8x11-1/2")
PHOTOMETER
FILTER FIXTURE AND TEST FILTER
CYLINDRICAL EXTRACTION TUBE
CLEAN-GAS SAMPLE PORT
RAW-GAS SAMPLE PORT
CLEANING SYSTEM
BACKUP
FILTER
MASS FLOW
CONTROLLER
ABSOLUTE FILTER AND
ANDERSENIMPACTOR
MASS FLOW
CONTROLLER
Figure 1. Diagram of FEMA test apparatus
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Donaldson Company, Inc. 6255
SECTION 3
DESCRIPTION OF FILTER FABRIC
The Donaldson Company, Inc. Tetratec # 6255 filtration media is a 22 ounces per square yard, woven
fiberglass with Tetratex polytetrafluoroethylene (PTFE) membrane.
SECTION 4
VERIFICATION OF PERFORMANCE
4.1 QUALITY ASSURANCE
The verification tests were conducted in accordance with an approved test/QA plan.2 The EPA quality
assurance manager conducted an independent assessment of the test laboratory in lune 2005, and found
that the test laboratory was equipped and operated as specified in the test/QA plan.
The ETS QA officer and the APCT Center's QA staff have reviewed the results of this test and have
found that the results meet the overall data quality objectives as stated in the test/QA plan. Data on
calibration certificates for the flow meters, flow transducers, weights, low- and high-resolution balances,
thermometer, and humidity logger are maintained at ETS in a separate data package.
Deviations from the test plan include organizational personnel changes.
The ETS QA officer and the APCT Center's QA staff have also reviewed the results of the control tests,
which are summarized in Section 2.3, Table 1. The dust characterization control test met the appropriate
requirements of the test/QA plan and verification protocol. The reference fabric tests meet maximum
pressure drop and weight gain requirements established for reference fabric performance in the GVP,
indicating the measurement system is operating in control.
4.2 RESULTS
Table 2 summarizes the mean outlet particle concentration measurements for the verification test periods.
Measurements were conducted during the 6-hour performance test period. The performance test period
followed a 10,000-cycle conditioning period and a 30-cycle recovery period.
Table 2 summarizes the three verification tests that were performed under standard verification test
conditions. The average residual AP across each filter sample at the nominal 120 m/h (6.6 fprn) filtration
velocity [for a flow rate of 5.8 m3/h (3.4 cfin)] is also shown in Table 2. This AP ranged from 3.36 to
3.58 cm w.g. (1.32 to 1.41 in. w.g.) for the three filter samples tested. The residual AP increase ranged
from 0.29 to 0.31 cm w.g. (0.11 to 0.12 in. w.g.) for the samples tested. All three standard condition
verification runs were used to compute the averages given in Table 2. The PM2 5 concentration average
for the three runs is 0.0000209 g/dscm. The total PM concentration average for the three runs is
0.0000209 g/dscm.
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Donaldson Company, Inc. 6255
Table 2. Summary of Verification Results for Donaldson Company, Inc.'s Fabric 6255 Filtration
Media
Test run number
PM25 (g/dscm)**
Total PM (g/dscm)
Average residual AP (cm w.g.)
Initial residual AP (cm w.g.)
Residual AP increase (cm w.g.)
Mass gain of sample filter (g)
Average filtration cycle time (s)
Number of cleaning cycles
4V6-R1
0.0000187
0.0000187
3.36
3.19
0.31
0.14
141
153
4V6-R2
0.0000252
0.0000252
3.58
3.42
0.30
0.09
133
162
4V6-R3
0.0000187
0.0000187
3.47
3.31
0.29
0.09
134
161
Average*
0.0000209
0.0000209
3.47
3.31
0.30
0.11
136
159
* All three verification runs were used to compute averages.
** One or more of the impactor substrate weight changes for these results was near the reproducibility limit of the
balance.
4.3
LIMITATIONS AND APPLICATIONS
This verification report addresses two aspects of baghouse filtration product performance: outlet particle
concentration and AP. Users may wish to consider other performance parameters such as service life and
cost when selecting a baghouse filtration fabric for their application.
In accordance with the GVP, this verification statement is applicable to baghouse filtration products
manufactured between signature of the verification statement and 3 years thereafter.
SECTION 5
REFERENCES
Generic Verification Protocol for Baghouse Filtration Products, RTI International, Research
Triangle Park, NC, February 2000. Available at http://www.epa.gov/etv/pdfs/vp/05 vp bfp .pdf.
Test/QA Plan for the Verification Testing of Baghouse Filtration Products (Revision 2), ETS,
Inc., Roanoke, VA and RTI International, Research Triangle Park, NC, February 2006. Available
at http://www.epa.gov/etv/pdfs/testplan/600etv06095/600etv06095 .pdf
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