Short answer. SSAW (spiral submerged arc welded) pipe is made by forming steel coil into a helix and welding the seam inside and out. It is the practical choice for large-diameter water transmission mains, where seamless pipe is limited by diameter and cost.
The spiral seam spreads stress along the pipe body. OD, wall thickness and length are set by hydraulic calculations, pressure class and external loads, not by a standard stock size.
For municipal water, the pipe body is normally paired with cement mortar lining inside and a project-specified external coating outside. Those are two separate decisions.
Field joints decide real-world performance: end preparation, lining termination and girth weld coating must be defined before the order is placed.
Youcheng supplies SSAW pipe from OD 219 mm to 3800 mm and can support third-party inspection at the mill.
On Southeast Asian water projects the design reference is normally AWWA C200 together with AWWA M11. Confirm the edition in the owner’s specification before quoting.
For coastal and island water schemes in Southeast Asia, the OD also has to clear the destination port’s lifting limits and the site crane capacity before the hydraulic choice is locked in.
See our spiral welded steel pipe for the supply range. Send your design flow, pressure class and preferred OD and we will return a pipe schedule you can price. Send your enquiry.
