What are the differences between SSAW and LSAW?
Both SSAW and LSAW pipes are large-diameter steel pipes. And they can all manufacture according to API 5L, ASTM A252, ASTM A53 GR.B and etc. We are an LSAW steel pipe manufacturer. So let’s see what’s the differences between LSAW and SSAW pipe from 6 aspects.
1) LSAW Steel Pipes and SSAW Different in the Name:
LSAW steel pipes is an abbreviation of Longitudinal Submerged Arc-Welding. Its welding line is straight.
|Product:||LSAW Pipe (Longitudinal Submerged Arc-Welding Pipe)|
|Application:||Used for oil/gas/water transmission; Offshore Projects|
|Size:||O.D.:406.4 mm to 1524.0 mm;|
W.T.: 7.0 mm to 40.0 mm ;
|Standard:||API 5L PSL 1 & PSL 2;|
ASTM A252; ASTM A572; ASTM A53;
AN/NZS 1163; AN/NZS 1074 ;
AN/NZS 1163; AN/NZS 1074
SSAW steel pipe is short of Spiral Submerged Arc-Welding, also called HSAW pipe. Its welding line shape like a helix.
2) Different in the Manufacturing Process:
LSAW steel pipes are taking the steel plate as raw material, mold it by the molding machine, then do double-sided submerged arc welding. Through this process, the LSAW steel pipe will get excellent ductility, weld toughness, uniformity, plasticity, and great sealing.
SSAW steel pipe’s manufacture process is rolling the steel strip, to make the rolling direction have an angle with the direction of the pipe center, forming and welding. So the welding seam is in a spiral line.
3) Different in Length Range :
LSAW steel pipes length range from 3 m to 15 m. The maximum length of the LSAW steel pipe is 15 m. If you want longer it should choose the T-Welded pipe.
SSAW steel pipe length can be made to the end-use of steel strip. The longest pipe I have seen and transport to Australia is a 33.5 m SSAW steel pipe.
4) Different in Size Range and Performances:
LSAW pipe’s diameter range normally from 16 inches (406.4 mm) to 60 inches (1524.0 mm). Wall thickness from 6.0 mm to 30.0 mm. Good performances on high-pressure resistance, and low-temperature corrosion resistance.
SSAW steel pipe diameter range is from 8 inches (219.1 mm) to 120 inches (3040.0 mm); Wall thickness from 5.0 mm to 25.0 mm.
The advantage part is we can get the different diameter of SSAW pipes with the same size as the steel strip, there is a wide application for the raw material steel strip.
And welding seam of SSAW steel pipe should avoid the primary stress, good performances to bear the stress. The disadvantage is the bad physical dimension, welding seam length is longer than the pipe length, easy to cause the defects of cracks, air hole, cinder inclusion, partial welding, welding force in pulling status.
Thought SSAW steel pipe is using the same welding technology of Submerged Arc-Welding with LSAW steel pipes. Differently, the SSAW pipe is spiral welded where the LSAW is longitudinally welded.
5) Different Application:
LSAW steel pipes have been widely applied in the oil and gas pipelines, especially required large diameter and thick wall pipe with high strength and long-distance. Meanwhile in construction of a structure that needs tough strength, water treatment, thermal industry, bridge building, etc.
According to API specifications, the LSAW pipe is specially designated in large-scaled oil and gas transportation, in the cases that pipeline across the city, sea, and the urban area.
SSAW pipes used for oil and gas pipeline systems. But in petroleum design specification, the SSAW could only be applied in Construction structure, water transport and sewage treatment, thermal industry, building, etc.
6) Different Price:
For different use of the raw material, the price of LSAW is higher than the SSAW steel pipe. But the LSAW has better performance than the SSAW steel pipe. For commonly used steel grade, the MOQ for the LSAW pipe has no limitation while SSAW is about 30 ~ 50 tons per size.
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