Longitudinal submerged arc welded pipe definition
Longitudinal Submerged Arc Welded pipe can express as LSAW steel pipe. LSAW steel pipe, a type of longitudinally welded steel pipe produced by using the double sided submerged arc welding method. LSAW steel pipe are welded tubular products made out of flat plates that are formed, bent and prepared for welding. LSAW are welded with a straight seam that runs length wise across the pipe.
Longitudinal submerged arc welded pipe manufacturing process
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.
Scope of Longitudinal submerged arc welded pipe
LSAW steel pipe applied to dimension:
Outside diameter: from 16 in (406.4 mm) to 56 in (1422.2 mm).
Wall thickness from 6.0mm to 40.0mm.
Length: 3m – 15m
Longitudinal submerged arc welded steel pipe Steel Grade
Common Class: API 5L Gr.B PSL1, PSL2, Sour Service pipe
Medium: X42, X46
Medium and high: X56
High level: API 5L X60 PSL1, PSL2 LSAW steel pipe
High: API 5L X65 PSL1, PSL2 LSAW/SSAW line pipe
Premium high: API 5L X70
Premium high: API 5L X80
Usage of Longitudinal submerged arc welded pipe
LSAW Steel Pipe are use in onshore and offshore oil and gas pipelines requiring critical service. LSAW steel pipe are commonly used in high pressure oil and gas pipelines because of their shorter welded seams and easier serviceability. These pipes are commonly required for sections of a pipeline that extend across areas with high population o building sensity or involve sub-sea applications.
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