Pipes and fittings of longitudinally welded hot-dip galvanized steel pipes with spigot and socket for waste water systems. Requirements, testing, quality control|Hot-dip galvanizing, Drainpipes, Accelerated testing, Chemical-resistance tests, Type testing, Marking, Water, Dimensional measurement, Spigot-and-socket joints, Testing conditions, Mechanical testing, Grades (quality), Performance testing, Sewers, Technical documents, Drainage, Pipe fittings, Elongation at fracture, Pressure pipes, Ozone, Hardness measurement, Surface treatment, Pipes, Test specimens, Pipe couplings, Defects, Corrosion resistance, Waste-water drainage, Leak tests, Seamed pipes, Quality control, Volume measurement, Physical properties of materials, Physical testing, Ageing tests, Form tolerances, Compression set, Low-temperature testing, Steels, Thermal testing, Stress relaxation