Spiral pipe is also called spiral steel pipe or spiral welded pipe. It is made of low carbon structural steel or low alloy structural steel strip according to a certain spiral angle (called forming angle), and then the pipe seam is welded. It can produce large diameter steel pipe with narrow strip.

Spiral pipe is mainly used for oil and natural gas pipelines, and its specifications are expressed by outer diameter * wall thickness. The spiral pipe has single-sided welding and double-sided welding. The welded pipe shall ensure that the hydraulic test, the tensile strength and cold bending performance of the weld meet the requirements.

Common standards for spiral pipes are generally divided into: SY/T5037-2018 (ministry standard, also known as spiral seam submerged arc welded steel pipe for common fluid transportation pipeline), GB/T9711.1-1997 (national standard, also known as technical conditions for delivery of oil and gas industry transportation steel pipe part I: grade a steel pipe (strict requirements include GB/T9711.2 grade B steel pipe)), API-5L (american petroleum institute, also known as pipeline steel pipe; which is divided into PSL1 and PSL2 two levels), SY/T5040-92 (pile with spiral seam submerged arc welded steel pipe).