Pipes and fittings of longitudinally welded hot-dip galvanized steel pipes with spigot and socket for waste water systems - Part 3: Dimensions and special requirements for vacuum drainage systems and for drainage systems in ship-building
废水系统用带插口和插座的纵向焊接热浸镀锌钢管和配件第3部分:真空排水系统和造船排水系统的尺寸和特殊要求