This part of ISO 21809 specifies the requirements for qualification, application, testing and handling of
materials required for the application of reinforced concrete coating externally to either bare pipe or pre-coated
pipe for use in pipeline transportation systems for the petroleum and natural gas industries as defined in
ISO 13623.
The external application of concrete is primarily used for the negative buoyancy of pipes used in buried or
submerged pipeline systems and/or for the mechanical protection of the pipe and its pre-coating.
This part of ISO 21809 is applicable to concrete thicknesses of 25 mm or greater.