Standard Test Method for Sulfuric Acid Resistance of Polymer Linings for Flue Gas Desulfurization Systems

SCOPE
1.1 this test method is intended to evaluate the sulfuric acid resistance at elevated temperatures of polymer linings applied to carbon steel substrates subject to sulfuric acid attack.  
1.2 The values stated in inch-pound units are to be regarded as the standard. the values given in parentheses are for information only.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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09-Jun-1997
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ASTM D6137-97 - Standard Test Method for Sulfuric Acid Resistance of Polymer Linings for Flue Gas Desulfurization Systems
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 6137 – 97
Standard Test Method for
Sulfuric Acid Resistance of Polymer Linings for Flue Gas
Desulfurization Systems
This standard is issued under the fixed designation D 6137; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 5162 Practice for Discontinuity (Holiday) Testing of
Nonconductive Protective Coating on Metallic Substrates
1.1 This test method is intended to evaluate the sulfuric acid
2.2 Steel Structures Painting Council Standards
resistance at elevated temperatures of polymer linings applied
SSPC VIS 1–89 Visual Standard
to carbon steel substrates subject to sulfuric acid attack.
SSPC No. SP5 Blast Cleaning to White Metal
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
3. Significance and Use
information only.
3.1 The results obtained by this test method can be used in
1.3 This standard does not purport to address all of the
combination with other test methods for the selection of a
safety concerns, if any, associated with its use. It is the
lining for surfaces in flue gas desulfurization (FGD) systems
responsibility of the user of this standard to establish appro-
that will be exposed to hot unscrubbed flue gas or to scrubbed
priate safety and health practices and determine the applica-
gas that has been reheated well above the water dew point.
bility of regulatory limitations prior to use.
3.1.1 This test method does not evaluate or correlate to areas
2. Referenced Documents within the scrubber or scrubbed gas streams at temperatures at
or below the water dew point.
2.1 ASTM Standards:
3.2 This test method is intended to evaluate the combined
A 36/A 36M Specification for Structural Steel
effects of heat and exposure to sulfuric acid upon a lining
C 868 Test Method for Chemical Resistance of Protective
system as applied to a carbon steel substrate. It does not
Linings
produce the thermal gradient through the lining that may exist
D 660 Test Method for Evaluating Degree of Checking of
in actual applications. Actual lining performance may also be
Exterior Paints
affected by concurrent physical or mechanical effects and other
D 661 Test Method for Evaluating Degree of Cracking of
chemicals that may be present in the flue gas.
Exterior Paints
3.3 This test method evaluates major failure modes of
D 714 Test Method for Evaluating Degree of Blistering of
4 linings applied to square test panels that are cycled from room
Paint
temperature to a designated elevated temperature.
D 772 Test Method for Evaluating Degree of Flaking (Scal-
4 3.4 The recommended test temperatures of 200°F (93°C)
ing) of Exterior Paints
and 350°F (177°C) are based on typical maximum operating
D 1186 Test Methods for Nondestructive Measurement of
zone temperatures in flue gas desulfurizations systems. Other
Dry Film Thickness of Nonmagnetic Coatings Applied to
temperatures may be evaluated as desired. Cycling to lower
a Ferrous Base
temperatures, including freezing, may be considered if appli-
D 1474 Test Method for Indentation Hardness of Organic
cable.
Coatings
3.5 The standard acid concentration for all tests is 20 %,
D 4138 Test Method for Dry Film Thickness of Protective
recognizing that the concentration will quickly rise to the
Coating Systems by Destructive Means
equilibrium at the selected test temperature.
D 4417 Test Method for Field Measurement of Surface
Profile of Blast Cleaned Steel
4. Apparatus
4.1 Forced Air Circulation Oven, capable of maintaining the
selected test temperature 6 4 F° (2C°). Note that acid fumes
This test method is under the jurisdiction of ASTM Committee D-33 on
Protective Coating and Lining Work for Power Generation Facilities and is the direct may damage the oven and a drip pan and protective shroud
responsibility of Subcommittee D33.09 on Protective Lining for FGD Systems.
may be needed.
Current edition approved June 10, 1997. Published August 1997.
Annual Book of ASTM Standards, Vol 01.04.
Annual Book of ASTM Standards, Vol 04.05.
4 6
Annual Book of ASTM Standards, Vol 06.01. Available from the Steel Structures Painting Council (SSPC), 5416 Henry St.,
Annual Book of ASTM Standards, Vol 06.02. Pittsburgh, PA 15213.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D6137–97
4.2 Rack or Stand, to support the test panels vertically in the including longer cure times or elevated cure temperature, may
oven while maintaining a distance of at least 1 in. (25 mm) be conducted if specified. Conditioning time and temperature
between the panels and between the panels and oven walls. shall be recorded and stated in the test report.
5. Test Specimen
6. Procedure
5.1 Substrate:
6.1 Preheat the oven to the required test temperature of
5.1.1 Test panels shall be new commercial quality, carbon
200°F (93°C) or 350°F (177°C) unless otherwise specified.
steel conforming to Specification A 36/A 36M. Panels shall be
6.2 Immerse the lower portion of the test panel(s) in a 20 %
a minimum of ⁄4-in. (6-mm) thick, and 8-in. (200-mm) square,
solution (by volume) of sulfuric acid at laboratory temperature
and shall have their edges broken or radiused if the lining is to
of 73 6 4°F for 1 h. The upper 4 in. (10 cm.) shall remain
be wrapped over the edges of the panel.
above the fluid level.
5.1.2 These test panels are large enough and rigid enough
6.3 Remove the test panel(s) and allow to dry for approxi-
for linings and coatings up to ⁄4-in. thick. For thicker linings,
mately 15 min in a vertical position at laboratory temperature.
the test panels shall be at least 32 times the lining thickness in
6.4 Place the test panel(s) in the preheated oven in a vertical
height and width.
position such that there is a minimum 1-in. (25-mm) space
5.1.3 Two control test panels shall be prepared for each
between the panels and between the panels and the oven walls.
lining system tested. One shall be cycled between the selected
Panel(s) shall remain in the oven for 16 6 1h.
temperatures without exposure to acid. The second shall be
6.5 Remove the panel(s) at the end of each exposure period.
maintained at laboratory conditions without exposure to either
Place the panels in a vertical position with a minimum of one
elevated temperature or acid.
inch space between panel(s) and allow them to cool at
5.2 Preparation:
laboratory temperature for
...

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