(1) This Part 4-3 of EN 1993 provides principles and application rules for the structural design of cyllindrical steel pipelines for the transport of liquids or gases or mixtures of liquids and gfases at ambient temperatures, witch are not treated by other European standards covering particular applications. (2) Standards dealing with specific pipeline applications should be used for these purpose, notably - EN 805:2000 for water supply systems (drinking water); - EN 1295:1997 for buried pipelines under various conditions of loading (waste water); - EN 1594:2000 for gas supply systems for operating pressures over 16 bar; - EN 12007:2000 for gas supply systems up to and including 16 bar; - EN 12732:2000 for welding; - EN 13941:2003 for pre-insulated bonded pipe systems for district heating; - EN 13480:2002 for industrial pipelines; - EN 14161:2004 for pipeline transportation systems for the petrolium and natural gas industries.