Pipes and fittings of longitudinally welded stainless steel pipes with spigot and socket for wastewater systems - Part 4: Components for vacuum drainage systems and for drainage systems on ships
废水系统用带插口和插座的纵向焊接不锈钢管和配件.第4部分:真空排水系统和船舶排水系统用部件;德文版EN 1124-4:2013