ISO 21809-4:2009

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Petroleum and natural gas industries — External coatings for buried or submerged pipelines used in pipeline transportation systems — Part 4: Polyethylene coatings (2-layer PE)

ISO 21809-4:2009 is an international standard that specifies the requirements for applying, inspecting, testing, handling, and storing two-layer polyethylene (2-layer PE) coatings used as external corrosion protection on bare steel pipes in the petroleum and natural gas pipeline transportation industry;