ISO 21809-3:2016

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Petroleum and natural gas industries — External coatings for buried or submerged pipelines used in pipeline transportation systems — Part 3: Field joint coatings

ISO 21809-3:2016 is an International Standard that specifies requirements for "field joint coatings" applied to welded or seamless steel pipes used in buried or submerged sections of pipeline transportation systems within the petroleum and natural gas industries; essentially defining the quality standards for the coating applied to the welded joints of pipeline sections to protect against corrosion, as outlined in ISO 13623