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LSAW Steel Pipe

LSAW steel pipe (Longitudinal double submerge arc welding steel pipe/DSAW steel pipe) is one kind of the SAW pipes,it is made of steel plates of hot rolled by JCOE or UOE forming technology.

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LSAW Steel Pipe

LSAW steel pipe(Longitudinal double submerge arc welding steel pipe/DSAW steel pipe) is one kind of the SAW pipes,it is made of steel plates of hot rolled by JCOE or UOE forming technology. Our company usually produce the pipes by JCOE  technology,the JCOE means the forming process, as J shape firstly, then C shape, and then O forming,E forming process at last, while inner & outside welding and cold expansion after welding. Compared with UOE LSAW pipes, our productive line could produce more sizes,OD406mm-1620mm, pipe length: 2m-18m,the thcikness from 6.35mm-60mm and our LSAW pipes has its superiority:

• Feature: Large diameter,thick wall,high pressure&low temperature resistance.
• Test: Chemical Component Analysising, Mechanical Properties (Ultimate tensile strength,Yield strength, Elongation), Technical Properties (Flattening Test,Blow Test, Impact Test,DWT test),Exterior Size Inspection, Hydrostatic Test, X-ray Test,UT test.

•Our LSAW pipes could also be welded with flanges ,lifting eyes or other parts according to the requirement of the clients.

  1. LSAW/DSAW API 5L PSL1 STEEL PIPE  

  2. 1.Specifications: Ф406mm-Ф1620mm, thickness 6mm-20mm.
    Material: Q235B, Q345B, ,GRB,10 # , 20 #, X42-X80 grade and so on. 
    2.our productive Standard:  SY/T0315-97, SY/T0315-2005, CAN/CSA-Z245.20-M98, DIN30671, Q/CNPC38-2002, DIN 30670
    SY/T0413-2002 "of buried steel pipe polyethylene coating technology standards" 

LSAW STEEL PIPE

  1. LSAW/DSAW API 5L PSL2 PIPE

Double submerge arc welding steel pipe (DSAW )/Longitudinal-seam Submerge arc welding steel pipe(LSAW).

Product specification level(PSL),there are PSL1, PSL2. PSL2 NACE for sour service. PSL2 LSAW steel pipe require more inspection in API SPEC 5L standard new edition, Impact test is mandatory. The chemical analysis,mechanical properties,technical properties,welding test, repair welding is also different between PSL1 and PSL2.

There are special requirements from the purchasing of material and production and inspection for PSL2 LSAW pipes


  1. a)For PSL 2 pipe, the steel shall be killed and made according to fine grain practice.

  2. b)The strip or plate used for the manufacture of PSL 2 pipe shall not contain any repair welds.


  1. c)For PSL 2 pipe, during the processing,the manufacturer shall establish and follow documented procedures for maintaining the heat identity and the test-unit identity for all such pipe. Such procedures shall provide means for tracing any length of pipe to the proper test unit and the related chemical and mechanical test results.


  1. d)The chemical composition for API 5L PSL2 LSAW Pipe


3.API5L NACE MR0175 LSAW Steel Pipe

NACE MR 0175 require the pipe material anti sour service for LSAW steel pipe.Such as H2S gas transportation. Special Test for NACE: Chemical Component Analysis especially for S,P content.Hardness Vicker test usually performed.HIC/SWC test will be carried out according to NACE TM0284.Or if agreed in an alternative test.refer to ISO15156 Table B

JCOE lsaw steel pipe

4.  GOST-8731-1974-ENG
1. technical requirements the dimensions of the pipes and deviations  must comply with values set by GOST-8731-1974/GOST 8732-78notes: 1.For pipes with walls in excess of 45 mm thickness the mechanical properties required shall be agreed on by the manufacturer and the customer.
2. the mechanical properties of pipes made of steel grades which are not specified in table

 

5. ANTI-CORROSSION LSAW PIPES

The epoxy internal coating is a new coating developed technology, we use the electrostatic spraying epoxy powder coating as a layer. The coating has a coating operation is simple, clean, good impact resistance and bending coating properties, heat resistance characteristics.

DIN30670-91 in Germany, "polyethylene pipe and fittings coated technical standards"

CAN/CSA-Z245.21-M92 Canada "wall polyethylene pipe anti-corrosion coating technology standards"

Coated LSAW steel pipe

The epoxy internal coating is a new coating developed technology, we use the electrostatic spraying epoxy powder coating as a layer. The coating has a coating operation is simple, clean, good impact resistance and bending coating properties, heat resistance characteristics.

6.Flange LSAW Steel Pipe

lsaw-steel-pipe-with-flanges