What is the difference between SSAW SAWH spiral steel pipe and LSAW SAWL steel pipe?
SSAW Steel pipe (Spiral Submerged-arc Welded Steel pipe), also called SAWH Steel pipe (Helical SAW), welding line shape like a helix. It is using the same welding technology of Submerged-arc Welded with LSAW Steel pipe. Differently SSAW Steel pipe is spiral welded where the LSAW is longitudinally welded. Manufacturing process is rolling the steel strip, to make the rolling direction have an angle with the direction of the Steel pipe center, forming and welding, so the welding seam is in a spiral line.
SSAW Steel pipe (SAWH Steel pipe) Size range and Features
The SSAW Steel pipe diameter range is from 8.62 inch to 138 inch or more, 219 mm to 3520 mm or more. The advantage part is we can get the different diameter of SSAW steel pipe with the same size of the steel strip, there is a wide application for the raw material steel strip, and welding seam should avoid the primary stress, good performances to bear the stress.
Applications of SSAW Steel pipe
For oil and gas industries, the SSAW Steel pipe / SAWH Steel pipe could be applied for oil gas transmission; SSAW SAWH spiral steel pipe can be also used as construction structure, water transmission and sewage treatment, power, heat supply industry, buildings foundation, etc.
LSAW Steel pipe Manufacturing Process
LSAW steel pipe (Longitudinal Submerged-arc Welded Steel pipe), also called SAWL Steel pipe. It is 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.
Diameters range and performances of LSAW Steel pipe
The LSAW Steel pipe diameter range is larger than ERW, normally from 16 inch to 60 inch, 406mm to 1500mm. Good performances on high pressure resistance, and low-temperature corrosion resistance.
Applications of LSAW Steel pipe
It has been widely applied in the oil and gas pipelines, specially required large diameter and thick wall steel pipe with high strength and long distance. Meanwhile in construction of structure that need tough strength, water treatment, thermal industry, bridge building, etc. According API specifications, the LSAW steel pipe (SAWL steel pipe or JCOE steel pipe) is specially designated in large scaled oil and gas transportation, in the cases that pipelines across the city, sea, and the urban area.
