An owner or user of pressure vessels who exercises control over the operation, engineering, inspection, repair, alteration, pressure testing and rerating of those pressure vessels.

Source: API 510, Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration Downstream Segment, Ninth Edition, June 2006. Global Standards



Company or person who employs the equipment.

Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards



Individual or company that uses equipment or material, or implements standards.

Source: API RP 8B, Recommended Practice for Procedures for Inspections, Maintenance, Repair and Remanufacture of Hoisting Equipment, Seventh Edition, March 2002 (Reaffirmed: August 2012). Global Standards


User or user/purchaser

The company, organization or entity that purchases, installs, and/or uses equipment.

Source: API TR 1PER15K-1, Protocol for Verification and Validation of High-pressure High-temperature Equipment, First Edition, March 2013. Global Standards


User and/or operator

Organization that uses and/or operates the C/WO riser system.

Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards



Users as mentioned in the second subsection, can be own personnel or external suppliers of services and equipment.

Source: Guidelines Regarding the Management Regulations, Norway, updated December 2012. Regulatory Guidance



User of the equipment.

Source: IEC 60079-19:2015, Explosive atmospheres – Part 19: Equipment repair, overhaul and reclamation, Edition 3.1, March 2015. Global Standards



Anyone interacting with the system, including its operators and maintainers.

Source: IMO MSC.1/Circ.1512, Guideline on Software Quality Assurance and Human-Centred Design for e-navigation, 8 June 2015, International Maritime Organization. Regulatory Guidance

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