Key Performance Indicators (KPIs) have become well established for assessing the performance of equipment, in both terms of production capability and safety performance. Regulators are particularly interested in ensuring that KPIs for safety critical equipment are in place and are routinely measured and reviewed. KPIs do, however, have limitations when they are applied to complex passive equipment such as the structure, and because of this the importance of the primary structure as being safety critical can be diminished. Most KPIs applied to structure relate to maintenance aspects such as frequency and timeliness of inspections and efficacy of defect assessment.

A series of KPIs for structures, both in terms of components and of systems has been developed to enable both the Structural Integrity Management team and more particularly the management or operators and offshore personnel on installations to have an appreciation of the performance and capabilities of the installations and such that regulators can have an appreciation of the relative performance of different installations.

Experience from the auditors while undertaking structural integrity audits have shown that although operators recognize the importance of the structure they can have difficulty in quantifying its criticality, limitation and in particular of possible causes of damage and failure. This understanding will enable operators to concentrate resources to the optimum maintenance and repair of structures.

The paper describes the derivation and functionality of the structural KPIs which provide a way to improve the understanding of structural limitations and hence the possibilities for life extension and factors relevant to decommissioning.

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