What is the difference between API 5L X65 PSL1 and PSL2?
The main differences between API 5L X65 PSL1 and API 5L X65 PSL2 are in the level of product specification and manufacturing requirements. The following is a detailed comparison:
Product specification level:
PSL1 and PSL2 are two different product specification levels within the API 5L standard. the requirements for PSL2 are more stringent and cover higher quality control standards.
Chemical Composition and Mechanical Properties:
PSL2 has more stringent requirements for chemical composition and mechanical properties than PSL1. PSL2 requires more precise chemical composition control and higher performance mechanical properties.
Impact Properties:
PSL1 does not require impact performance testing, while PSL2 requires full-size 0°C impact function testing for all grades except X80, which requires a higher average of full-size 0°C impact functions.
Hydrotesting and non-destructive testing:
According to API 5L standard, line pipe should be hydrotested branch by branch, and PSL2 requires non-destructive testing branch by branch, while PSL1 does not require non-destructive inspection.
Pipe end treatment:
The pipe end of PSL2 must be sandblasted, while PSL1 does not.
To summarise, API 5L X65 PSL2 is more demanding than PSL1 in a number of aspects (such as chemical composition, mechanical properties, impact properties, hydrotesting and pipe end treatment), which makes PSL2 grade steel pipe perform better in extreme environments and have better durability than PSL1 grade steel pipe. When selecting for use, the appropriate product specification level needs to be chosen based on the specific application scenario and requirements.
