PHMSA currently incorporates by reference the 45th edition of API Specification 5L “Specification for Line Pipe” in parts 192 and 195. API Spec 5L is the primary manufacturing specification for seamless and welded steel pipe for use in both gas and hazardous liquid pipeline transportation systems. API recently issued a 46th edition of this standard in April 2018, effective May 1, 2019. This new edition includes slightly more stringent pipe end-straightness tolerance requirements and clarifications on how to define and measure end-squareness.
On May 1, 2019, PHMSA issued a notice which stays the requirements of API Spec 5L, 45th edition, provided that the 46th edition is used in its place. Pipe manufacturers can use the 46th edition now, and they won’t have to wait for PHMSA to officially incorporate it by reference.