AWWA standard for coal-tar protective coatings and linings by American Water Works Association. American National
By American Water Works Association. American National Standards Institute.
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Additional resources for AWWA standard for coal-tar protective coatings and linings for steel water pipelines, enamel and tape, hot applied
The electrical equipment used to test the enamel and tape systems in the shop, yard, or field shall be a portable, low-amperage, adjustable-voltage, pulse-type holiday detector employing an audible signaling device. The holiday detector shall be provided with a coil-spring electrode or a suitable brush-type electrode. 1 Input power. The primary input wattage shall be no higher than 20 W,and the minimum number of pulses at crest voltage shall be 20 per sec. 2 Operating voltage. 1 For electrical inspection of exterior pipe coatings, the operating voltage of the detector shall be established according t o the following procedure, but in no case shall the operating voltage exceed 15,000V.
4 in. (13 mm). Then place the knife blade under the loosened end. Grasping the loose end of the enamel strip between the knife blade and thumb, pull slowly and steadily upward. Measure and record the length that the enamel strip has peeled or lifted before breaking. 4in. ” Repeat the procedure for each successive higher temperature level until the 160°F (71°C) test has been completed. 4 Laboratory test for bond (72 hr). Store the second test plate in a horizontal position with the enamel side up in an air chamber with the temperature maintained at 160°F f 2°F (71°C It 1°C) for a period of 72 hr f 2 hr.
10 Glass fiber felt outerwrap weight-loss-on-heating tests. Cut two samples 6 in. x 12 in. (152 mm x 305 mm) in size. Remove all loose surfacing material from both sides of the sample to prevent any loose particles from falling off in the oven during heating or during the test. Weigh each strip and suspend them on wire hooks in an oven maintained at 180°F f 5°F (82°C f 3°C). Exercise care to ensure that the samples do not touch each other or the sides of the oven and that localized overheating does not occur.