API 5L pdf download.Specification for Line Pipe 1 Scope 1.1 PURPOSE AND COVERAGE The purpose of this speciÞcation is to provide standards for pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries. This speciÞcation covers seamless and welded steel line pipe. It includes plain-end, threaded-end, and belled-end pipe, as well as...