Longitudinally Welded and Double SAW

Petrosadid: Longitudinally Welded and Double SAW

Welded pipe (pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding. The most popular process for large diameter pipe uses a longitudinal seam weld or Longitudinally Submerged Arc Welded Steel pipes (LSAW).

DSAW Pipe is often extruded by automatic double-wire double-sided submerged arc welding process. DSAW pipe is simple, high efficiency and low cost. In the steel pipe forming steel plate deformation evenly, the residual stress is small, does not appear to scratch the surface of the phenomenon. In the diameter and thickness of the steel pipe size specifications can be used flexibly in the production of large diameter thick seam steel pipe advantage is more obvious. In the production process can be pre-welded after welding inside and outside, to ensure that welding does not appear wrong side, welding bias and not penetration and other defects, the quality of welding control easier.

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LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production. For transporting large quantities of hydrocarbons over long distances, longitudinal submerged arc welded (LSAW) pipes have been used for decades. When operational conditions require high wall thickness due to high internal or external pressures, LSAW pipes are commonly the most economical solution. Offshore pipelines link platforms at subsea wells with the processing devices onshore. Environmental and population safety aspects trigger high‐quality requirements and appeal to the responsibility of all involved bodies to put all efforts into safe pipeline operation.

Double Submerged Arc Welded (DSAW) steel pipe is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. The manufacturing of Double Submerged Arc Welded Pipe involves first forming steel plates into cylindrical shapes. Then the edges of the rolled plate are formed so that V-shaped grooves are formed on the interior and exterior surfaces at the location of the seam. The pipe seam would then be welded by a single pass of an arc welder on the interior and exterior surfaces. The welding arc is submerged under flux.

Petrosadid: Longitudinally Welded and Double SAW

Highlights of the Longitudinally Welded Pipes

Materials

SA53 / A53 Welded -Grade B,

API 5L Welded -Grades (B, X42, X46, X52, X56, X60, X65, X70 and X80) PSL 1, PSL 2

A333 / A333M (Gr. 1, 3, 4, 6, 7, 8, 9, 10, 11)

ASTM A334 / A334M

ASTM A312 TP(304, 304H, 304L, 309, 310, 316, 316L, 317L, 321, 347)

ASTM A409 TP(304, 304L, 309, 310, 316, 316L, 317L, 321, 347)

ASTM B673 (UNS N08925, UNS N08354, and UNS N08926)

ASTM A790 (UNS S31803, S32205, S31500, S32550, S31200, S31260, S32304, S39274, S32750, S32760, S32900, S32950, S39277, S32520, S32906, S32003)

ASTM B514, ASTM B517 (UNS N06600, UNS N06603, UNS N06025, and UNS N06045), ASTM B619 / B619M, ASTM B705 (UNS N06625, N06219 and N08825), ASTM B725 (UNS N02200/UNS N02201, UNS N04400), ASTM B775 / B775M, ASTM B464 / B464M (UNS N08020)

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