The majority of long-distance pipeline can be divided into electric resistance welding(ERW),Longigudinally Submerged Arc Welding(LSAW)、Spirally Submerged Arc Welding(SSAW)。LSAW can  be divided into UO(UOE)、RB(RBE)、JCO(JCOE) according to the forming methods.


ERW can be divided into two forms of induction welding and contact welding.it was made   with hot-rolled wide volume as raw material, pre-curved, continuous molding, welding, heat treatment, sizing, straightening, cutting, etc. compared with the spiral weld short, it has the advantage of high dimensional accuracy, uniform thickness, surface quality, pressure advantages, but the drawback is that only the production of small and medium-caliber thin-walled tube, weld easy to produce gray leaf spot, not fusion ditch-like corrosion defects. it is widely used in the field of urban gas, crude oil transportation.

Od:114-356mm (4"-14")                                                       

sch:3.0-12.7mm (1/8"-1/2") 

Specification: API、BS、ASTM 、JIS、DIN、GB 、ISO、DNV 

length:3-12.2m (10'-40') 

quality:GB/T9711 L190-L555 (API 5L A-X80) 

SSAW pipe is made of hot rolled coiled steel by automatic submerged arc weld under normal atmospheric temperature. All the pipes are produced according to API Spec 5L, GB/T9711.1, GB/T9711.2, ASTM A252-89 standard. These pipes mainly used in petroleum and natural gas industry to transport flammable and non-flammable liquid and steel construction.

Spiral welded steel pipes are widely used in Oil, Natural Gas, Water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range.

LSAW,produced in the mold or molding machine by using double-sided submerged arc welding and flaring from production with raw material. A wide range of the finished product specifications, weld toughness, ductility, uniformity and dense, with a large diameter, wall thickness, high pressure resistance, low-temperature corrosion resistance, etc.. Required steel pipe in the construction of high-strength, high toughness, high-quality long-distance oil and gas pipelines, mostly large diameter thick wall LSAW. 

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