Longitudinally Submerged Arc Welded Process Flow

LSAW (longitudinal submerged arc welded steel pipe) with single sheet as raw material, the steel plate in the mold or molding machine pressure (volume) using two-sided submerged arc welding and combustion production.

Longitudinally Submerged Arc Welded carbon steel pipes

(LSAW Pipes) with JCOE forming mode

Roller Pipes Process Flow

Range of roller pipes: Outer diameter: Ф1200-3800mm | Wall thickness: 12-120mm | Unit length (max) 3.2m.

Advantages of LSAW steel pipe
In the long-distance pipeline construction, with steel lines account for a large proportion, under normal circumstances, 35% to 40% of line pipe investments accounted for total project investment.
How to choose a reasonable price, excellent performance of the pipe is particularly important, a reasonable choice to save the pipe construction investment, to facilitate the construction and safe operation of the pipeline system has a very important impact. LSAW steel pipe advantage make it can be widely used for its unique long-distance oil and gas pipelines.
(1) Without the unwind process, the base material indentation, scratch less.
(2) The wrong side, slotted, and other easy-to-diameter perimeter control, excellent welding quality.
(3) The elimination of flaring basically does not exist residual stress after stress.
(4) Because it is a straight line weld, the weld is short, little risk of defects.
(5) After expanding, pipe geometry accuracy is improved greatly facilitate the on-site welding.
(6) For a straight seam, less impact on the quality of anti-corrosion coating materials.

Application
The pipes are mainly used as long distance transportation pipeline for oil, gas, liquid coal etc. on land and offshore.
And also can be applied as construction pipes on offshore platform, power station, petro chemistry and city construction etc.

Major characteristics
① The pipe internal stress is very small and uniformly distributed after the full- length expansion. The corrosion and cracking of the pipe owing to stress can be effectively prevented.
The application of welding on site is very easy because of the high dimension precision;
② The inside and outside welding are performed after the tack welding , so the welding process is very stable with good weld quality;
③ The NDT is easy to perform on the weld during production and field operation as well;
④ The length of the weld is shorter than that of the non-longitudinal seam pipe, so the probability of defects occurrence is very low;
⑤ The coverage of the pipe specification is very wide. The pipe can be either in very large diameter with thick wall or in very small diameter with thick wall.