HSAW Spiral Welded Pipes — API 5L, IS 3589 & AWWA C200

What is an HSAW Spiral Welded Pipe?

Helical submerged arc welded (HSAW) pipe, also called spiral welded pipe, is made by feeding steel coil at an angle into a forming unit so it wraps into a cylinder with a helical seam. The seam is welded by submerged arc welding inside and outside. Because the same coil width can make many diameters, HSAW is an economical way to produce very large diameters. It is chosen for water mains, sewage and drainage, penstocks, piling and structural uses, and for low to moderate pressure oil and gas lines where the specification permits a spiral seam.

Key features

• Stockist and supplier — sourced from spiral pipe mills; Teshi does not manufacture pipe
• Economical in very large diameters
• Helical seam welded by submerged arc process, inside and outside
• Bare or coated (e.g. epoxy lining, coal-tar, 3LPE) as ordered
• Standards: API 5L SAWH, IS 3589, AWWA C200
• Supplied with large-diameter flanges and fabrications manufactured by Teshi when needed

Specification

Applications

• Raw-water and treated-water transmission mains
• Sewage, drainage and storm-water lines
• Foundation and marine piling
• Penstocks and cooling-water lines
• Low-pressure gas and air ducts