Indian Standard No. Title STEEL IS 1239 Mild steel tubulars and other wrought steel fittings ** Part 1- 1979 Mild ssteel tubes (fourth revision) ** Part 2- 1982 Mild steel tubulars and other wrought steel pipe fittings (third revision) IS 1978 : 1982 Line pipe (second revision) IS 3589 : 1991 Electrically welded pipes for water, gas and sewage (1502 to 2000 mm normal size) (second revision) IS 5504 : 1969 Spiral welded pipes. IS 5822 : 1971 Code of practice for laying of welded steel pipes for water supply (first revision) IS 6392 : 1971 Steel pipe flanges. IS 6631 : 1971 Steel pipes for hydraulic purposes. IS 8062 Code of practice for cathodic protection of steel structures.