ISO/DIS 21809-4

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Oil and gas industries including lower carbon energy — External coatings for buried or submerged pipelines used in pipeline transportation systems — Part 4: Polyethylene coatings (2-layer PE)

"ISO/DIS 21809-4" refers to a draft international standard within the ISO (International Organization for Standardization) framework, specifically focused on the requirements for "two-layer polyethylene coatings" used as external coatings on buried or submerged pipelines in the petroleum and natural gas industries, outlining details for their qualification, application, inspection, testing, handling, and storage procedures.