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Specification 5L Specification for line pipe

Publication Year

2026

Document Status

Current

Abstract

Specifies requirements for the manufacture of two product specification levels of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.

Document History

47th edition, June 2026. Supersedes the 46th edition, April 2018.

Publisher Information

American Petroleum Institute

The API is a US trade association representing all aspects of the oil and natural gas industry, from large integrated companies to exploration and production, refining, marketing, pipeline and marine businesses, and service and supply firms.