Operational requirements of the system/structure/equipment in order to establish and maintain integrity.

Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards


The ability of a system to perform its specified role.  This may be characterized and demonstrated by identifying critical functional parameters.

Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC Guidelines



What a device or system is designed to do.

Source: OGP Report No. 415, Asset integrity – the key to managing major incident risks, International Association of Oil & Gas Producers, December 2008. Global Standards

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