LSAW Welded Line Pipe API 5L X52 PSL2 Sour Service NACE MR 0-175 32 In SCH40

The double submerged arc weld (DSAW, SSAW, HSAW, LSAW) process is similar to that of the ERW process in that coils of carbon steel are unrolled in a continuous ribbon. As the DSAW method of manufacturing is typically used for larger diameter pipe, the method of roll forming the skelp is similar...

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The double submerged arc weld (DSAW, SSAW, HSAW, LSAW) process is similar to that of the ERW process in that coils of carbon steel are unrolled in a continuous ribbon. As the DSAW method of manufacturing is typically used for larger diameter pipe, the method of roll forming the skelp is similar to but not exactly like that of ERW. DSAW pipe is typically either pyramid rolled (three angled OD rolls in the shape of a pyramid form the pipe) or rolled using the U-O-E process (skelp is first subject to a "U" shaped press, followed by a "O" shaped press). The most prominent difference between ERW and DSAW carbon steel pipe is the longitudinal weld. The DSAW arc weld is submerged in a flux media to keep the weld from being exposed to ambient contaminants. Also, both the OD and the ID of the pipe is welded, typically at separate times creating a situation where one weld consumes the other creating a higher quality weld. DSAW carbon steel pipe is easily distinguishable due to its prominent and consistent ID and OD weld seam. 

Line pipe steels used in sour service are prone to hydrogen-induced cracking (HIC) depending on metallurgical and environmental factors.
The metallurgical factors consist of alloying elements, microstructure, strength, segregation, and shape of non-metallic inclusions. Some environmental factors which influence HIC, also known as stepwise cracking (SWC), are the partial pressures of hydrogen sulfide (H2S) and carbon dioxide, temperature, pH of the medium, and aggressive ions, such as chloride. Many failures of sour gas line pipes have occurred around the world as a result of HIC.DOUBLE SUBMERGED ARC WELD (DSAW)


LSAW welded steel pipes

Size:
LSAW, DSAW: 
Outer Diameter: 219mm-1820mm
Wall Thickness: 4.8mm-70mm
Length: 6mtr-12mtr


Steel Grade:
API 5L: A, B, X42, X46, X52, X
56, X60, X65 X70   PSL1, PSL2
GB/T9711: L175, L210, L245, L290, L320, L360, L290, L320, L360, L390, L415, L450, L485, L555

BS:1387, EN10217:S185, S235,S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H, St12, St13, St14, St33, St37, St44, ST52

Surface: 

Lightly oiled, Hot dip galvanized,  Bare, black Varnish coating , Protective Coatings (Coal Tar Epoxy, Fusion Bond Epoxy, 3-layers PE)

Packing: 

Plastic plugs in both ends or steel ring end protector. loose

Test:

Chemical Component Analysis, Mechanical Properties, impact test, hardness, UT, RT, HT, HIC, SSC etc.
Mill Test Certificate:EN 10204/3.1B
Third party inspection: 
SGS, BV, Lloyds etc. 


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