Practice for qualification of polyethylene saddle fusion joints 聚乙烯鞍形熔融接頭合格鑒定的實施規(guī)范
Pipe joint assemblies and fittings for high - density polyethylene pressure pipes ; adaptors for fusion jointing , flanges and sealing elements ; dimensions 高密度聚乙烯壓力管道用管道連接組件和管道配件.第4
Pipe joint assemblies and fittings for types 1 and 2 polypropylene pressure pipes ; adaptors for fusion jointing , flanges and sealing elements ; dimensions 1型和2型聚丙烯壓力管道用管道連接組件和管道配件.第