Environmental Technology Verification
Baghouse Filtration Products
Donaldson Company, Inc.
Tetratex® 6277 Filtration Media
(Tested March 2011)
Prepared by
RTI International ETS Incorporated
BRTI
INTERNATIONAL
Under a Cooperative Agreement with
U.S. Environmental Protection Agency
EPA
EW EW ET
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THE ENVIRONMENTAL TECHNOLOGY VERIFICATION
PROGRAM
U.S. Environmental Protection Agency
HRTI
INTERNATIONAL
ETV Joint Verification Statement
TECHNOLOGY TYPE:
APPLICATION:
TECHNOLOGY NAME:
COMPANY:
ADDRESS:
WEB SITE:
E-MAIL:
BAGHOUSE FILTRATION PRODUCTS
CONTROL OF PM2 5 EMISSIONS BY BAGHOUSE
FILTRATION PRODUCTS
Tetratex® 6277 Filtration Media
Donaldson Company, Inc.
85 Railroad Dr. PHONE:
Ivyland,PA 18974 FAX:
http://www.donaldson.com
Anil.Suthar@Donaldson.com
Karen.Bentlev(£jDonaldson.com
(215) 396-8349
(215) 396-0516
The U.S. Environmental Protection Agency (EPA) 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. The ETV Program 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.
The ETV Program 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 (QA)
protocols to ensure that data of known and adequate quality are generated and that the results are
defensible.
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The Air Pollution Control Technology Center (APCT Center) is operated by RTI International* (RTI), in
cooperation with EPA's National Risk Management Research Laboratory (NRMRL). The APCT Center
evaluates the performance of baghouse filtration products (BFPs) used primarily to control PM25
emissions (i.e., particles 2.5 urn and smaller in aerodynamic diameter). This verification statement
summarizes the test results for Donaldson Company, Inc.'s Tetratex 6277 filtration media.
VERIFICATION TEST DESCRIPTION
All tests were performed in accordance with the APCT Center draft Generic Verification Protocol for
Baghouse Filtration Products, available at http://www.epa.gov/etv/pubs/05 vpbfp.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 and QA, procedures for
product selection, auditing of the test laboratories, and the test reporting format.
Outlet particle concentrations from a test fabric were measured with an impactor equipped with
appropriate substrates to filter and measure PM2s 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 PM2s. 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 BFPs 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
Donaldson Company, Inc. provided the following information about their product. The Donaldson
Tetratex 6277 is an ePTFE laminate on Polyester. Figure 1 is a photograph of the fabric. 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.
* RTI International is a trade name of Research Triangle Institute.
"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.
PC# 6277
ePTFE Laminate on Polyester
Figure 1. Photograph of Donaldson Company, Inc.'s Tetratex 6277 filtration media.
VERIFICATION OF PERFORMANCE
Verification testing of the Donaldson Company, Inc.'s Tetratex 6277 filtration media was performed
during the period of March 17, 2011, to March 23, 2011, for standard test conditions at the test facility of
ETS Incorporated, 1401 Municipal Road NW, Roanoke, VA 24012. Test conditions are listed in Table 1.
The overall test results summarized in Table 2 represent the averages of three individual tests.
The APCT Center quality manager has reviewed the test results and the quality control (QC) 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 PM25
concentration, filter outlet total mass concentration, pressure drop, 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.
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Table 1. Test Conditions for Baghouse Filtration Products
Brand/Model: Donaldson Company, Inc.'s Tetratex 6277 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 cleaning cycles
During conditioning period
During recovery period
Performance test duration
Value
18.4 ± 3.6 g/dscm (8.0 ± 1 .6 gr/dscf)
120±6m/h(6.6±0.3fpm)
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 ± 1 0%
5.8 ± 0.3 m3/h (3.4 ± 0.2 cfm)
1.13 ± 0.06 m3/h (0.67 ± 0.03 cfm)
10,000 cycles
30 cycles
6h±1 s
Beginning of table description. Table 1 is titled Test Conditions for Baghouse Filtration Products; the Brand/Model is
listed as Donaldson Company, Inc.'s Tetratex 6277 Filtration Media. The table describes the test conditions that are
specified in the QA/QC requirements for the test; all conditions were achieved for this test. The table lists the test
parameters in one column and their values in the next column. The test parameters include such items as the dust
concentration, filtration velocity, flow rates, air temperature and humidity, and the number of cleaning cycles during
the test. End of table description.
Table 2. Baghouse Filtration Product Three-Run Average Test Results
for Donaldson Company, Inc.'s Tetratex 6277 Filtration Media
Verification Parameter
Outlet particle concentration at standard conditions3
PM25, g/dscm
(gr/dscf)
Total mass, g/dscmb
(gr/dscf)
Average residual pressure drop (A P), cm w.g. (in. w.g.)
Initial residual A P, cm w.g. (in. w.g.)
Residual A P 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
<0.0000167C
(<0.0000073)
<0.0000167C
(<0.0000073)
3.57(1.40)
3.44(1.36)
0.24 (0.09)
154
0.17(2.67)
142
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Verification Parameter At Ration Test
Conditions
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 PM25 and larger particles that passed through the fabric.
c The measured value was determined to be below the detection limit of 0.0000167 grams per cubic
meter. The detection limit is for a 6-hour test and based on VDI 3926.
Beginning of table description. Table 2 is titled Baghouse Filtration Product Three-Run Average Test Results for
Donaldson Company, Inc.'s Tetratex 6277 Filtration Media. The table lists the verified test results for this product.
The table lists the verification parameters in one column and their values at the verification test conditions in the
next column. The verification parameters listed include the outlet particle concentration, the pressure drop
characteristics, the filtration cycle time, the mass gain of the test sample, and number of cycles during the test. End
of table description.
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.
signed by Sally Gutierrez 7/19/2011 signed by Jason Hill 6/30/2011
Sally Gutierrez Date Jason Hill Date
Director Director
National Risk Management Research Laboratory Air Pollution Control Technology 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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