ISO 21809-3  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 specifies requirements for field joint coating of seamless or welded steel pipes for buried and submerged sections of pipeline transportation systems

used in the petroleum, petrochemical and natural gas industries as defined in ISO 13623.

This part of ISO 21809 -3 specifies the qualification, application and testing of the corrosion protection coatings applied to steel surfaces left bare after the joining of

pipes and fittings (components) by welding.

This ISO standard  does not address requirements for additional mechanical protection, for thermal insulation or for joint infills of concrete weight-coated pipes.

NOTE Field joints of pipes and fittings coated in accordance with this part of ISO 21809 are considered suitable for further protection by means of cathodic protection.

*** Before conducting ISO 21809-3 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.