AWWA C210:2003 pdf download.Liquid-Epoxy Coating Systems for the Interior and Exterior of Steel Water Pipelines
4.4.3.2 Holdback for field welds. When pipe sections are to be joined together by field welding, a band that is free of lining and coating shall be left on the inside and outside surfaces at the ends of the sections. This band shall be of sufficient widths, as specified by the purchaser, to permit the making of field joints without damage to the lining and coating (Sec. 4.6.1). The manufacturer should be consulted for holdback width.
4.4.3.3 Pipe ends for nonwelded field joints. When rubber-gasketed joints or mechanical couplings are used, the coating shall extend to the ends of the pipe. The coating thickness on the pipe surfaces that receive rubber sealing gaskets shall not exceed what is recommended by the manufacturer of the coupling. However, the coating system’s dry film thickness shall not be less than 16 mils (406 µm). If the purchaser specifies steel pipe with rubber-gasketed joints; an interior lining of liquid epoxy meeting the requirements of this standard; and an external pipe coating of another material, such as those described in ANSI/AWWA C203, ANSI/AWWA C214, or ANSI/AWWA C215, the liquid-epoxy system shall be extended around the pipe end and cover the exterior pipe surface from the end to a point 4 in. (100 mm) past the sealing point of the rubber gasket.
4.4.3.4 Application temperature. Application shall be performed when the metal temperature is more than 5°F (2.8°C) above the dew point. The temperature of the mixed coating material shall not be lower than 50°F (10°C). The temperature of the pipe during application shall conform to the recommendations of the coating manufacturer. Preheating of the coating material; the use of in-line heaters to heat the coating material; or heating of the pipe, fittings, or pipe connections or appurte-nances and dehumidification equipment may be used to facilitate the application. Heating shall conform to the recommendations of the coating manufacturer.AWWA C210 pdf download.