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LSAW steel pipe,Spiral Pipe Manufacturing Practices standard

large-diameter thick-wall straight-seam Longitudinally Submerged Arc Welded (LSAW) Pipes.

Standard : GB/T3091-2001, BS1387-1985, ASTM A53, API 5L / API

Material : Q195, Q215, Q235, Q345, STK500

Grade : API 5L A, API 5L B, API 5L X42-X80

Packing : In hexagon bundle with pvc plastic sheet and slings

Application : Low pressure liquids delivery, such as water, gas and oil.

The mechanical property of the longitudinal-seam submerged arc welded (LSAW) pipes, which were made of steel plate cut from the hot rolled coils by both JCOE and UOE forming processes, conformed to the DNV-OS-F101, which showed that these pipes could be used for the submarine oil or gas transporting pipeline, movement of low pressure liquids like oil, water and many more.

LSAW PIPE:Spiral Pipe Manufacturing Practices standards

Project	Steel pipe
Project	GB/T9711-1997	SY/T5037-92	SY/T5038-92
Pipe end diameter deviation	D <508 ± 0.75% D D ≥ 508 ± 1.00% D	D <508 ± 0.75% D D ≥ 508 ± 1.00% D	± 1.25% D
Thickness deviation	D <508 +15.0% 12.5% T-t　 D ≥ 508 +17.5% t-10.0T	D <508 ± 12.5% t D ≥ 508 ± 1.00% t	± 1.25% T
Weld reinforcement	≤ 3.18mm	0.5-3.0mm	≤ 2.0mm inside the outer ≤ 2.5mm
Straightness	≤ 0.2% L	≤ 0.2% L	≤ 0.25% L
Pipe end state	30o-50o bevel blunt edge 1.59 ± 0.79mm trimming ≤ 1.59mm	30o-50o bevel blunt edge 1.6 ± 0.8mm D <813 Cut diagonally ≤ 1.5mm　 D <813 Cut diagonally ≤ 3.0mm	30o-50o bevel blunt edge 0-3mm Trimming ≤ 1.5mm
Weight deviation	Single +10.0% -3.5% -1.75% bulk loading	Single +10.0% -3.5% -1.75% bulk loading	Single +10.0% -3.5% -1.75% bulk loading
NDT	Less than 203mm from the pipe end welds ray inspection; than 203mm from the pipe end welds using ultrasonic inspection; rival welds, welding and weld ultrasonic inspection.	Head welding, welding and circumferential welds using ultrasonic inspection.	Head welding, welding and circumferential welds using ultrasonic inspection.
Hydrostatic Test	2 [sigma] P = ─ ─ ─ D	2 [sigma] P = ─ ─ ─ D	2 [sigma] P = ─ ─ ─ D
Remark	D: nominal pipe diameter, mm; t: nominal pipe wall thickness, mm; [σ] hydrostatic test experimental force, Mpa L: single pipe length, mm; P: hydrostatic testing experimental force, Mpa