API 5L LSAW Line Pipe

Double submerged arc welded pipe (DSAW or LSAW) derives its name from the welding process wherein the welding arc is submerged in flux while the welding takes place. Both inside and outside welds are required and are usually accomplished in separate processes, hence the word "double."...

Send InquiryChat Now

  Double submerged arc welded pipe (DSAW or LSAW) derives its name from the welding process wherein the welding arc is submerged in flux while the welding takes place. Both inside and outside welds are required and are usually accomplished in separate processes, hence the word "double." These separate welds consume a portion of the other, resulting in a single high quality weld nugget.

  Two different processes are used to manufacture LSAW pipe; the pyramid rolls method, and the U-0-E method. The difference in the processes is found only in the method of forming the cylinder. In the pyramid rolls process the cylinder is formed between 3 rolls arranged in a pyramidal fashion. As the name implies, the U-0-E method uses a "U" press, and "O" press for forming. Other parts of the process such as finishing and inspection are similar. Both processes use flat steel plate as the raw material.

  LSAW pipe may or may not be cold expanded. Cold expansion is a process where the pipe is expanded (up to 1.5%) to obtain its final OD dimension. In the process, a gain of yield strength results. Expansion is most often utilized in a U-O-E mill due to the need to recover the yield strength lost during forming in the "O" press.

  DSAW pipe is produced in sizes from 18" through 66" OD and wall thicknesses from .250" through 2.5".

  LSAW pipe is normally produced in double random lengths with square ends or beveled for welding.

  LSAW pipe is used in high-pressure gas and oil transmission lines (both onshore and offshore), structural members and pipe piles.

Hot Tags: API 5L LSAW line pipe, China, suppliers, factory, cheap, price, discount, bulk, customized
Related Products
Inquiry