The use of SSAW：
Sprial welded steel pipe(SSAW) is mainly used in oil and gas transmission pipeline,and its  specification is expressed as outside diameter * wall thickness .according to the external  structure, it is classfied single welding and double welding. Technically,the welded steel  pipe should ensure that hydrostatic test, weld tensile strength and the cold bending property  can comply with the regulations.

Size:
Outer Diamter: 219.1mm - 4064mm (8" - 160")
Wall Thickness: 3.2 mm - 40mm
Length: 6mtr-18mtr

Standard
BS:1387, EN10217:S185, S235,S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H, St12, St13, St14, St33, St37, St44, ST52,ASTM A 53,API 5L: GB/T9711: GB/T3091, SY/T5037, SY/T 5040,CJ/T 3022

Surface: Lightly oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings (Coal Tar Epoxy,? Fusion Bond Epoxy, 3-layers PE)

Test:
Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield
strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.

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