Definition of LSAW and SSAW
LSAW and SSAW steel pipe usually refers to the LSAW and SSAWe with an external diameter of quite 500mm. At present, the utmost diameter of double weld will reach 2020mm, and therefore the most diameter of single weld will reach 1220mm.Large LSAW and SSAW is especially created by double-sided submerged arc fastening, and therefore the merchandise meet the relevant standards through bending, joint, internal fastening, external fastening, straightening, flat head and alternative processes.LSAW and SSAW is that the most suitable option for large-scale pipeline project, water and gas transmission project and concrete pipe network construction.The formula for scheming the burden of large-mouth LSAW and SSAW is :[(outer diameter of 1 wall thickness) wall thickness *0.02466-kg/ m (weight per meter). GB/ t3091-2008 GB/ t9711.1-1997 is mostly adopted in China for large-mouth straight-seam steel pipe with API 5L normal.
API LSAW Pipe producing method
LSAW Pipe (Longitudinal Submerged Arc-Welding Pipe), is taking the plate as staple, mildew it by the molding machine, then do double-sided submerged arc attachment. Through this method the LSAW steel pipe can get glorious malleability, weld toughness, uniformity, malleability and nice protection.
Diameters vary and performances of LSAW pipe
The LSAW pipe diameter vary is larger than ERW, ordinarily from sixteen in. to sixty inch, 406mm to 1500mm. sensible performances on air mass resistance, and low-temperature corrosion resistance.
Octal has LSAW pipe on sale.
Applications of LSAW pipe
It has been wide applied within the oil and gas pipelines, specially needed massive diameter and thick wall pipe with high strength and long distance. in the meantime in construction of structure that require robust strength, water treatment, thermal business, bridge building, etc. According API specifications, the LSAW pipe is specially selected in massive scaled oil and gas transportation, within the cases that pipelines across town, sea, and therefore the geographic region. These are the category one and sophistication a pair of areas.
SSAW pipe producing method
SSAW Pipe (Spiral Submerged Arc-Welding Pipe), additionally known as HSAW pipe, attachment line form sort of a helix. it's victimization constant attachment technology of Submerged Arc-Welding with LSAW pipe. otherwise SSAW pipe is spiral welded wherever the LSAW is lengthwise welded. producing method is rolling the steel strip, to form the rolling direction have AN angle with the direction of the pipe center, forming and attachment, that the attachment seam is during a spiral line.
Size vary and performances of SSAW pipe
The SSAW pipe diameter vary is from twenty in. to a hundred inch, 406 metric linear unit to 2540 mm.The advantage half is we will get the various diameter of SSAW pipes with constant size of the steel strip, there's a good application for the staple steel strip, and attachment seam ought to avoid the first stress, sensible performances connected the strain.
The disadvantage is that the unhealthy physical dimension, attachment seam length is longer than the pipe length, straightforward to cause the defects of cracks, air hole, fragment inclusion, partial attachment, attachment force in pull standing.
Applications of SSAW pipe
For oil and gas pipeline systems, however in crude oil style specification, the SSAW pipe / HSAW pipe may solely be applied at school three and sophistication four areas. Construction structure, water transport and waste matter treatment, thermal business, buildings etc.
LSAW pipe has higher performances than SSAW pipe.
As higher than the specs of the each kind SAW pipe, it outlined that SSAW pipe are going to be utilized in the realm that not important. Until now, u. s., Japan, Deutschland have reject perspective for SSAW pipe, and not instructed within the key pipelines. North American nation and European country use SSAW pipe for partial pipelines. Russian few pipelines in SSAW, and they need created strict implement terms. And for China, as a result of the historical factors, most of the key pipelines in China still use SSAW pipe.
Compared to seamless pipe, ERW pipe. ERW, SAW pipe is principally utilized in oil and gas transportation. wherever Seamless steel pipe is principally utilized in oil and gas drilling, explorations.