ASTM D5499-94(R2021) pdf free download

ASTM D5499-94(R2021) pdf free download.Standard Test Methods for Heat Resistance of Polymer Linings for Flue Gas Desulfurization Systems
1. Scope
1.1 These test methods are intended to evaluate the resis- tance 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 expo- sure. 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 are provided for information only and are not considered standard. 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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-airCirculation Oven, capable ofmaintaining 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 1 in. (25 mm) between the panels and between the panels and oven walls.
5. Test Specimens
5.1 Substrate: 5.1.1 Test panels shall be new commercial quality carbon steel conforming to Specification A36/A36M. Panels shall be a minimum of 1 ⁄ 4 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 be at least 32 times the lining thickness in each direction. 5.1.3 One test panel shall be 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. 5.2 Preparation: 5.2.1 Prepare one side of each panel in accordance with SSPC No. SP5 to the degree of cleanliness represented in SSPC VIS 1–89. Clean, new, angular abrasive shall be used. The surface profile shall be as recommended by the lining manufacturer. Determine and record the average profile depth in accordance with Test Method D4417, Test Method A using a visual surface profile comparator or Test Method B, using a tape replica. 5.2.2 Apply the lining to the prepared surface of the test panels in a manner as closely simulating field application as possible and as prescribed by the manufacturer’s latest techni- cal bulletin. Record the manufacturer’s batch numbers or manufacturing dates, mixing method, mixing time, and method of application. 5.2.3 The lining may be terminated at the edges of the panel or may be wrapped around the panel edges. 5.2.4 The lining thickness shall be within 10 % of the maximum lining thickness specified by the manufacturer. 5.3 Specimen Measurements: 5.3.1 Determine and record the thickness of the lining material using an appropriate dry-film thickness gage in accordance with SSPC PA-2.