​API Specification 5L 45th Edn.

​API Specification 5L 45th Edition is the American Petroleum Institute's standard for the manufacture of seamless and welded steel line pipes used in the transportation of petroleum and natural gas. It defines two Product Specification Levels (PSL 1 and PSL 2), with PSL 2 encompassing more stringent requirements for chemical composition, mechanical properties, and non-destructive testing. The specification includes provisions for various applications, such as sour service (Annex H), offshore service (Annex J), and resistance to ductile fracture propagation (Annex G). It also outlines detailed marking requirements, testing protocols, and quality management system expectations to ensure product reliability and safety in pipeline operations.