The main difference between spiral submerged arc welded steel pipe (SSAW) and longitudinally submerged arc welded steel pipe (LSAW) is their production process.
SSAW pipes are made by shaping a steel coil into a spiral shape, then welding the seam along the spiral using submerged arc welding technology. This allows for a large diameter pipe to be produced with relatively thin walls. SSAW pipes have a uniform diameter along their entire length and are generally used for larger diameter pipes, such as those used for transporting gas and oil.
LSAW pipes, on the other hand, are formed by bending a steel plate into a U-shape, then welding the two ends of the plate together using submerged arc welding technology. The resulting pipe has a uniform wall thickness and a longitudinal seam running down its length. LSAW pipes are generally used for smaller diameter pipes, typically in the range of 16 to 64 inches in diameter, and are often used for conveying water and natural gas.
In summary, the main differences between SSAW and LSAW pipes are their production process, the type of welding used, the diameter of the pipes produced, and the applications for which they are used.
