1.适用范围和领域1。1本标准涉及在工厂通过镀锌对球墨铸铁管进行外部涂层。1.2本标准包括锌涂层规范、应用要求和涂层检查。此外，还包括对镀锌表面的终饰层的要求。1.3待涂覆的管道应符合以下要求之一:ANSI/AWWA C151/A21。511986球墨铸铁管，离心铸造在金属模具或砂衬模具中，用于水或其他液体。ISO 25311986压力管道用球墨铸铁管、配件和附件。

1. Scope and Field of Application1.1This Standard deals with the external coating of ductile iron pipe at the factory by zinc-coating.1.2This Standard includes specifications for the zinc-coating, application requirements, and coating inspection. Also included are requirements for the finishing layer applied to the zinc- coated surface.1.3Pipe to be coated shall comply with one of the following:ANSI/AWWA C151/A21.51, 1986 Ductile-iron pipe, centrifugally cast in metal molds or sand- lined molds for water or other liquids.ISO 2531, 1986 Ductile iron pipes, fittings and accessories for pressure pipe-lines.