What is Longitudinal Submerged Arc Welded Pipe?

Longitudinal Submerged Arc Welded  pipe can express as LSAW steel pipe. LSAW steel pipe, a type of longitudinal welded steel pipe. It produced by using the double sided submerged arc welding method. LSAW steel pipe welded tubular products. It made out of flat plates that formed, bent and prepared for welding. LSAW welded with a straight seam that runs length wise across the pipe.

LSAW steel pipe weld seam is straight
LSAW steel pipe weld seam is straight

Manufacturing Process of LSAW Pipe

The LSAW Steel Pipe manufacturing flow chart:

Plate UT – Vacuum Lifting – Ultrasonic Inspection – Edge Milling – Pre Bending – Type J Forming – Type C Forming – Type O Forming – Tack Welding By CO2 Gas Shield Arc Welding – Tab Welding – Inside Welding – Outside Welding – Removal of Tab Plate – Cleaning – Rounding – X Test – Ultrasonic Testing – Washing Before Expansion – Mechanical Expansion – Washing After Expansion – Straightness – Hydrostatic Test – Ultrasonic Testing – Weld Grinding for Pipe Ends – Mechanical Facing – X-Ray Test for Body and Both Ends – Ultrasonic Testing for Pipe Ends – Magnetic Particle Inspection For Both Ends – Weighing and Measuring Length – Product Inspection – Outside Coating – Inside Coating – Marking – Packing and Warehousing.

longitudinal submerged arc welded pipe seam
LSAW pipe seam

Scope of Longitudinal Submerged-Arc Welded Pipe

  • Outside diameter: from 16 in (406.4 mm) to 60 in (1524.0 mm).
  • Wall thickness from 6.0mm to 40.0mm.
  • Length: 3m – 15m

LSAW Pipe Steel Grade

  • Common Class: API 5L Gr.B PSL1, PSL2, Sour Service pipe
  • Grade Medium: X42, X46, X52
  • Medium and High: X56
  • Grade High Level: API 5L X60 PSL1, PSL2 LSAW steel pipe
  • High Level: API 5L X65 PSL1, PSL2 LSAW/SSAW line pipe
  • Grade Premium High: API 5L X70
  • Premium High: API 5L X80

Usage of LSAW Pipe

LSAW Steel Pipe used in onshore and offshore oil and gas pipelines. Thees all required critical service. It used in high-pressure oil and gas pipelines. Because of their shorter welded seams and easier serviceability. These pipes required for sections of a pipeline. It extend across areas with a high population of building density. Or involve sub-sea applications.

Usage of LSAW pipe
Usage of Longitudinal submerged arc welded pipe