What is the standard for spiral steel pipe used in sewage treatment plants?

Spiral steel pipe for sewage treatment plant is made of SY/T 5037-2012 "Submerged arc welded steel pipe for common fluid conveying pipeline", which is made of double-sided automatic submerged arc welding or single-sided welding for water, gas, air and steam.  

Commonly used standards for spiral steel pipes are generally divided into: SY/T 5037-2012 (partial standard, also called spiral seam submerged arc welded steel pipe for ordinary fluid conveying pipeline), GB/T 9711.1 (national standard, also called oil and gas industrial conveying steel pipe delivery Part of the technical conditions: Class A steel pipe (strictly required GB/T9711.2B steel pipe)), API-5L (American Petroleum Institute, also called pipeline steel pipe; which is divided into two grades of PSL1 and PSL2), SY/T5040 ( Pile with spiral welded steel pipe).