This document specifies requirements and gives recommendations on integrity management of pipeline during the design, construction, commission, operation, maintenance and abandonment. This document applies to offshore pipeline for transporting petroleum and natural gas. It applies to rigid steel pipelines. It is not applicable to flexible pipelines, dynamic risers or those constructed from other materials, such as glass-reinforced plastics. An offshore pipeline system extends to: - the first valve, flange or connection above water on platform or subsea mechanical connector with subsea structure (i.e. manifold or dynamic riser); - the connection point to the offshore installation (i.e. piping manifolds are not included); - the first valve, flange, connection or isolation joint at a landfall, unless otherwise specified by the onshore legislation. The components mentioned above (valve, flange, connection, isolation joint) include also any pup pieces, i.e. the offshore pipeline system extends to the weld beyond the pup piece, see in Figure 1.