ISO 21809-11:2019

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Petroleum and natural gas industries — External coatings for buried or submerged pipelines used in pipeline transportation systems — Part 11: Coatings for in-field application, coating repairs and rehabilitation

ISO 21809-11:2019 is an international standard that specifies the technical requirements for "in-field application, coating repairs, and rehabilitation" of external coatings on buried or submerged pipelines used in the petroleum and natural gas industries, essentially defining the standards for applying, repairing, and restoring protective coatings on operational pipelines in the field.