What is the difference between API 5L PSL1 and PSL2 standards?
API 5L generally refers to the executive standard of pipeline steel pipe, which is used to transport the oil, steam and water pumped out of the ground to oil and natural gas industrial enterprises.
Pipeline steel pipe includes seamless steel pipe and welded steel pipe. At present, the commonly used welded steel pipe types in oil pipeline in China include spiral submerged arc welded pipe (SSAW), longitudinal submerged arc welded pipe (LSAW) and resistance welded pipe (ERW). Seamless steel pipe is generally selected when the pipe diameter is less than 152mm.
API 5L has two standards PSL1 and PSL2, but there is a big gap between the two standards. Let me talk about the differences between PSL1 and PSL2 in detail:
- PSL is the abbreviation of product specification level. The product specification level of pipeline pipe is divided into PSL1 and PSL2, or the quality level is divided into PSL1 and PSL2. PSL2 is higher than PSL1. The two specification levels are not only different in inspection requirements, but also in chemical composition and mechanical property requirements. Therefore, when ordering according to API 5L, the terms in the contract must indicate the product specification level, i.e. PSL1 or PSL2, in addition to the usual indicators such as specification and steel grade. PSL2 is stricter than PSL1 in chemical composition, tensile properties, impact energy, nondestructive testing and other indicators.
- Impact performance is not required for PSL1. For all steel grades of PSL2 except X80, the average value of Akv at full size 0 ℃ is: longitudinal ≥ 41j, transverse ≥ 27j. X80 steel grade, full size 0 ℃ Akv average value: longitudinal ≥ 101J, transverse ≥ 68J.
- The pipeline shall be subject to hydrostatic test one by one, and the standard does not specify that nondestructive replacement of hydrostatic pressure is allowed, which is also a big difference between API standard and Chinese standard. PSL1 does not require NDT, and PSL2 shall conduct NDT one by one.
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