This document presents assessment requirements and associated guidance for extending the service life of a pipeline system, as defined in ISO 13623, beyond its specified design life. It applies to both onshore and offshore rigid metallic pipelines and risers [including steel catenary risers (SCRs)].

This document is not directly applicable to the following:

—     flexible pipelines;

—     pipelines constructed from other materials, such as glass reinforced plastics or polymers;

—     umbilicals (control or chemical conveyance service, or both);

—     topsides equipment and piping (outside of pipeline system limits defined in accordance with local regulatory requirements);

—     pipeline protection and support structures and components.

However, the assessment process defined herein can be applied in the lifetime extension assessment of the above at the discretion of the user.

This document addresses life extension, which is a change to the original design premise. It is also applicable to other changes to the design premise, such as maximum allowable operating pressure (MAOP) re-ratings or a change to the conveyed fluids, at the discretion of the user.