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This document summarizes API Specification 5L, which provides requirements for the manufacture of line pipe to be used in pipeline transportation systems for liquid petroleum products and natural gas. It specifies requirements for materials, mechanical properties, dimensions, markings, coatings, inspection and testing. The specification defines two Product Specification Levels (PSL 1 and PSL 2) which have different requirements in terms of mechanical properties and non-destructive testing. The document contains numerous tables, figures and appendices that provide detailed specifications for line pipe.





































































































































































