This part of ISO 21809 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 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 part of ISO 21809 does not address requirements for additional mechanical protection, for thermal
insulation or for joint infills of concrete weight-coated pipes.