DS EN 1123-1:2000 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 Defines requirements, tests and quality control for longitudinally welded, hot-dip galvanized steel pipes and fittings with spigot and socket for use in waste water systems usually operating under gra