Longitudinally Welded Steel Pipes

LSAW (Longitudinally Submerged Arc Welded) pipes are welded along the length of the pipe and can be manufactured in two distinct methods, each offering its own set of advantages and limitations.

In the first production method, a coil is used. The coil is unrolled and folded widthwise to create a circular shape. Subsequently, the seam is welded, forming a “longitudinal seam” along the entire length of the pipe. This continuous process continues until the coil is fully unwound, making it suitable for standard diameters and thicknesses.

The second production method involves using steel plates, the plates are rolled into a pipe shape tailored to the customer’s project specifications. These pipes are welded along the length of the pipe. Due to the limited length of separately produced pipes – caused by the lmited plate width – they are joined together using a round seam. This method is suitable for projects that require thick-walled pipes.

Applications include piles, bored piles, mooring posts/fenders, jetties, and piping.