Spiral steel pipe standard classification: Spiral seam submerged arc welded steel pipe for pressure fluid transport (SY5036-83) is mainly used for pipelines conveying oil and natural gas; spiral seam high-frequency welded steel pipe (SY5038-83) for pressure fluid transmission, with high Frequency welding welding method, used for pressurized fluid conveying spiral seam high-frequency welding steel pipe. The steel pipe has strong pressure bearing capacity, good plasticity, easy for welding and processing and molding; general low pressure fluid conveying spiral submerged arc welded steel pipe (SY5037-83), used for double-sided automatic submerged arc welding or single-sided welding method for water, Submerged arc welded steel pipes for the transport of low pressure fluids such as gas, air and steam are generally classified into: SY/T5037-2000 (partial standard, also known as spiral joint submerged arc welded steel pipe for ordinary fluid transmission pipelines), GB /T9711.1-1997 (GB, also known as the delivery of oil and gas industry steel pipe technical conditions Part I: Grade A steel pipe), API-5L (American Petroleum Institute, also known as line pipe), SY/T5040-92 (pile Spiral seam submerged arc welded steel pipe) Spiral steel pipe inspection technology is as follows: raw material inspection - leveling inspection - butt welding inspection - forming inspection - internal welding inspection - external welding inspection - pipe cutting inspection - ultrasonic inspection - groove inspection - Dimension Inspection - X-ray Inspection - Hydrostatic Testing - Final Inspection