Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

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.
lsaw pipe
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



Steel pipe




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


≤ 2.0mm inside 
the outer ≤ 2.5mm


≤ 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


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


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


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