API 5L PSL 1 Grade B | Chemical Composition and …
Differences between API 5L PSL 1 and PSL 2. Above all, in API 5L Specification, there are two product levels (PSL 1 and PSL 2) of seamless and welded steel pipe. But, Level PSL 1 is a standard quality for line pipe. While level PSL 2 contains extra requirements. Such as chemical, mechanical properties, and testing requirements.