Under What Circumstances Is The Tube Type Selected?

General principle: LSAW or SSAW shall be selected for large-diameter trunk line (above Φ 508mm); ERW is selected for small and medium-sized branch pipelines; LSAW is preferred for high steel grade, large wall thickness and severe working conditions; LSAW or seamless pipes are preferred for submarine pipelines and crossing sections; SSAW can be selected for large-diameter water transmission pipeline with low pressure rating.