ISO 21809-4:2009

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 specifies the requirements for qualification, application, inspection, testing, handling and storage of materials for plant application of two-layer polyethylene coatings (2-layer PE) applied externally for the corrosion protection of bare steel pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623.

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