1. PSL is short for product specification level. The product specification level of line pipe is divided into API 5L PSL1 steel pipe and API 5L PSL2 steel pipe, it can also be said that the quality level is divided into PSL1 and PSL2.
PSL2 is higher than PSL1. These two specification levels are not only different in inspection requirements, but also in chemical composition and mechanical properties. Therefore, when ordering according to API 5L, the terms in the contract shall not only indicate the usual indicators such as specifications and steel grades. , Must also indicate the product specification level, that is, API 5L PSL1 steel pipeor API 51 PSL2 steel pipe.
API 5L PSL2 steel pipe is stricter than API 5L PSL1 steel pipe in terms of chemical composition, tensile properties, impact energy, non-destructive testing and other indicators.
2. API 51 PSL1 steel pipe does not require impact performance. API 5L PSL2 steel pipe is required for all steel grades except x80.
3. Pipeline pipes should be subjected to water pressure test one by one, and the standard does not provide for non-destructive substitution of water pressure. This is also a big difference between the API standard and the Chinese standard. API 5L PSL1 steel pipe does not require non-destructive testing, API 5L PSL2 steel pipe should be non-destructive testing one by one.