DIN EN 1123-1:2004-12
废水系统用带承插口的直缝焊接热浸镀锌钢管的管道和管件第1部分:要求、测试、质量控制
Pipes and fittings of longitudinally welded hot-dip galvanized steel pipes with spigot and socket for waste water systems - Part 1: Requirements, testing, quality control; German version EN 1123-1:1999 + A1:2004