What is the difference between API 5L grade B PSL1 steel pipe and API 5L grade B PSL2 pipe

API 5L is a pipeline steel pipe specification formulated by the American Petroleum Institute, B is a kind of pipeline steel grade. In the API standard, the pipeline is divided into two levels: PSL1 and PSL2. In the standard, there are slight differences in chemical composition, mechanical properties, inspection items, acceptance standards, and delivery status between API 5L grade B PSL1 steel pipe and API 5L grade B PSL2 pipe.

The difference between API 5L grade B PSL1 steel pipe and API 5L grade B PSL2 pipe:
1. PSL is short for product specification level. The product specification level of line pipe is divided into PSL1 and PSL2, it can also be said that 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 different in chemical composition and mechanical properties. Therefore, when ordering according to API 5L, the terms in the contract are in addition to the usual indicators such as specifications and steel grade , Must also indicate the product specification level, namely PSL1 or PSL2, such as API 5L grade B PSL1 steel pipe and API 5L grade B PSL2 pipe.

API 5L grade B PSL2 pipe is stricter than API 5L grade B PSL1 steel pipe in terms of chemical composition, tensile properties, impact energy, and non-destructive testing.

2. API 5L grade B PSL1 steel pipe does not require impact performance, API 5L grade B PSL2 pipe is required.

3. The water pressure test of line pipe should be done branch by branch, and the standard does not stipulate that non-destructive replacement of water pressure is allowed. API 5L grade B PSL1 steel pipe does not require non-destructive testing, API 5L grade B PSL2 pipe should be tested non-destructively.