API 5L STEEL PIPE STANDARD

API 5L steel pipe generally refers to the implementation of standard line pipe, line pipe is used to extract the surface oil, gas, water and other transportation companies to the oil and gas industry pipeline. Line pipe including seamless and welded steel pipe two categories. China is currently in the pipeline line pipe welded steel pipe commonly used type spiral submerged arc welded pipes (SSAW), LSAW pipe (LSAW), electric resistance welded pipe (ERW). Seamless steel pipe is generally selected when the pipe diameter is less than 152mm.

There API 5L steel pipe PSL1 and PSL2 two standards. Here I will elaborate on the differences between PSL1 and PSL2

1, PSL product specification level is short. Product specification level pipeline is divided into PSL1 and PSL2. We can also say that the quality level is divided into PSL1 and PSL2. PSL2 above PSL1. This is different than just two levels of specification testing requirements. And chemical composition, mechanical performance requirements are also different. Therefore, according to API 5L ordering. Terms of the contract in addition to the usual indicators indicate the size, grade and other outside. You must also specify the product specification level. That PSL1 or PSL2. PSL2 chemical composition, tensile properties, the impact energy, non-destructive testing and other indicators are stricter than PSL1.

2, PSL1 requirements do not impact performance. PSL2 except x80 all steel grades. Full size 0 ℃ Akv mean: Portrait ≥41J, lateral ≥27J. X80 steel grade full size 0 ℃ Akv mean: Portrait ≥101J, lateral ≥68J.

3, line pipe pressure test should be done by branching. And not standard provisions allowing non-destructive generation of water pressure. This is also a API standards and our standards a big difference. PSL1 destructive testing is not required. PSL2 should support by non-destructive testing.