AWWA C203:2020 pdf download.Coal-Tar Protective Coatings and Linings for Steel Water Pipe
4.3.3.1 Quality of enamel. Coal tar shall be produced from coal that has a minimum heating value of 13,000 Btu/lb (7.233 × 10 6 cal/kg) on a moisture- and mineral-free basis (ASTM D388) and that has been carbonized in a slot-type coke oven at a temperature of not less than 1,652°F (900°C). The coal-tar enamel shall be Type I or Type II enamel as specified by the purchaser. When tested in accordance with Sec. 5.4, the enamel shall have the physical properties shown in Table 1 and shall be composed of a specially processed coal-tar pitch and compatible oils combined with an inert mineral filler. The enamel shall contain no asphalt of either petroleum or natural base.
4.3.4 Outerwraps.
4.3.4.1 Description. The outerwrap shall be a Type 1, 2, or 3 glass fiber mat base (as described in Table 2) or a Type 1, 2, or 3 glass fiber mat that has been uniformly impregnated and heavily coated with a coal-tar saturant produced from coal tar meeting the requirements of Sec. 4.3.3.1 that is compatible with the coal- tar enamel coating. The outerwrap shall have a uniform porosity that allows the air and fumes to escape and the hot coating to bleed through the outerwrap, ensuring it is fused into the outer surface.
4.3.4.2 Quality of outerwrap. The outerwrap shall be Type 1, 2, or 3 as specified by the purchaser. When tested in accordance with Sec. 5.4, the outerwrap shall have the physical properties shown in Table 2.
4.3.4.3 Appearance. When tested in accordance with ASTM D146, finished outerwrap shall have a uniform surface free from holes, slits, and other visible defects. Where applicable, the reinforcement yarns shall be spaced evenly over the width. Fine mineral matter (surfacing material) may be applied to the surface to prevent sticking between layers of the packaged outerwrap prior to its application. Before packaging, loose or unbonded surfacing material shall be removed from the surface of the wrap by brushing or other suitable means. When unrolled at temperatures between 32°F and 100°F (0°C and 38°C), the outerwrap.AWWA C203 pdf download.