ASTM D5499-94 (R2021) pdf free download.Standard Test Methods for Heat Resistance of Polymer Linings for Flue Gas Desulfurization Systems.
1 .1 These test methods are intended to evaluate the resistance of polymer linings applied to carbon steel substrates to elevated temperatures. Two separate methods are included as follows:
1.1.1 Test Method A Continuous elevated temperature exposure, and
1. 1.2 Test Method B Cycling elevated temperature exposure.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that arc provided for information only and are not considered standard.
3. Significance and Use
3.1 The results obtained by these test methods can be used in combination with other test methods for the selection of a lining in flue gas desulfurization (FGD) systems.
3.2 These methods are intended to evaluate effects of heat alone upon a lining system as applied to a carbon steel substrate. These methods do not produce the thermal gradient that may exist in actual applications. Actual lining performance may also be effected by concurrent physical mechanical or chemical effects.
3.3 These methods evaluate major failure modes of linings applied to square test panels.
3.4 The recommended test temperatures of 200°F (93°C) and 350°F (177°C) are based on typical maximum operating zone temperatures in flue gas desulfurizations systems. Other temperatures may be evaluated as desired.
4. Apparatus
4. 1 Forced-air Circulation Oven, capable of maintaining the selected test temperature within 4°F (2°C).
4.2 A Rack or Stand to support the test panels vertically in the oven while maintaining a distance of at least I in. (25 mm) between the panels and between the panels and oven walls.
5 Test Specimens
5. 1 Suhstrate.
5.1.1 Test panels shall be new commercial quality carbon steel conforming to Specification A36/A36M. Panels shall be a minimum of ¼ in. (6 mm) thick, and 8 in. (200 mm) square.
5.1.2 These test panels are large enough and rigid enough for linings and coatings up to 0.25-in. (6-mm) thick. For thicker linings, the test panels shall he at least 32 times the lining thickness in each direction.
5.1 .3 One test panel shall he prepared for each test temperature, for each method (Test Method A or Test Method B). in addition to a control panel, which shall be maintained at laboratory conditions without elevated temperature exposure.ASTM D5499 pdf download.