Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Remote Terminal Unit (RTU)
Definition(s)
Remote Terminal Unit (RTU)
Computer located at a remote location that gathers the information provided by all the PLCs at the location, and transmits that information back to the host computer. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsRemotely Operated
Definition(s)
Remotely Operated
Controlled at a remote location by hydraulic, pneumatic or electrical actuation. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsRemotely Operated Tool
Definition(s)
Remotely Operated Tool (ROT)
Dedicated tool that is normally deployed on lift wires or drill string. NOTE Lateral guidance can be by guide wires, dedicated thrusters or ROV assistance. Source: API RP 17H, Remotely Operated Vehicle (ROV) Interfaces on Subsea Production Systems, First Edition, July 2004 (Reaffirmed January 2009). Global StandardsRemotely Operated Tool System
Definition(s)
Remotely Operated Tool System
Dedicated, unmanned, subsea tools used for installation and inspection, maintenance, and repair (IMR) tasks that require lift and/or handling capacity beyond that of free-swimming ROV systems. NOTE The ROT system comprises wire-suspended tools with control system and support-handling system for performing dedicated subsea intervention tasks. They are usually deployed on lift wires or a combined lift wire/umbilical. Lateral guidance may be via guidelines, dedicated thrusters, or ROV assistance. Source: API Recommended Practice 17H, Remotely Operated Tools and Interfaces on Subsea Production Systems, Second Edition, June 2013 (Addendum 1, October 2014). Global StandardsRemotely Operated Vehicle
Definition(s)
Remotely Operated Vehicle (ROV)
Free-swimming or tethered submersible craft used to perform tasks such as inspection, valve operations, hydraulic functions, and other general tasks. NOTE ROVs can also carry tooling packages for undertaking specific tasks such as pull-in and connection of rigid spools, flexible flowlines, umbilicals, and component replacement. Alternatively modules or tools may be deployed by crane and mated with the ROV subsea. ROVs are grouped within the following main categories: — OBSROV (observation class ROV; MCA Class I and Class II)—These vehicles are small vehicles fitted with cameras/lights and may carry sensors or inspection equipment. They may also have a basic manipulative capability. They are mainly used for inspection and monitoring. — WROV (work class ROV; IMCA Class III)—These vehicles are large ROVs normally equipped with a five-function grabber and a seven-function manipulators. These commonly have multiplexing controls capability that allows additional sensors and tools to be operated without the need for a dedicated umbilical system. WROV are split into two classes: medium WROV and large WROV depending on their defined work scope. WROVs can carry tooling packages to undertake specific tasks such as tie-in and connection function for flowlines, umbilicals, and rigid pipeline spools, and component replacement. Source: API Recommended Practice 17H, Remotely Operated Tools and Interfaces on Subsea Production Systems, Second Edition, June 2013 (Addendum 1, October 2014). Global StandardsRemotely Operated Vehicle (ROV)
Free-swimming submersible craft used to perform tasks such as valve operations, hydraulic functions and other general tasks. NOTE ROVs can also carry tooling packages for undertaking specific tasks such as pull-in and connection of flexible flowlines and umbilicals, and component replacement. Source: API RP 17H, Remotely Operated Vehicle (ROV) Interfaces on Subsea Production Systems, First Edition, July 2004 (Reaffirmed January 2009). Global StandardsRemotely Operated Vehicle (ROV)
An unmanned vehicle for offshore subsea use. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsRemoulded Undrained Shear Strength
Definition(s)
Remoulded Undrained Shear Strength
The magnitude of the shear stress that a disturbed soil can sustain in an undrained condition.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsRemoval
Definition(s)
Removal
De-install the lifting appliance from its operating location. Source: Verification of Lifting Appliances for the Oil and Gas Industry, DNV-OSS-308, October 2010, Det Norske Veritas AS, Global StandardsRemoval Section
Definition(s)
Removal Section
First section in the surface drilling-fluid system, consisting of a series of compartments to remove gas and undesirable solids. Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global StandardsRenewal
Definition(s)
Renewal
Activity that discards an existing component, fitting, or portion of a piping circuit and replaces it with new or existing spare materials of the same or better qualities as the original piping components.
Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global StandardsRenewal
Renewal:- when used in relation to a petroleum exploration permit, petroleum retention lease or petroleum production licence—has the meaning given by subsection 11(1); or
- when used in relation to a greenhouse gas assessment permit or greenhouse gas holding lease—has the meaning given by subsection 11(2).
Repair
Definition(s)
Repair
The work necessary to restore a piping system to a condition suitable for safe operation at the design conditions.- NOTE: If any of the restorative changes result in a change of design temperature or pressure, the requirements for re-rating also shall be satisfied. Any welding, cutting, or grinding operation on a pressure-containing piping component not specifically considered an alteration is considered a repair. Repairs can be temporary or permanent (see Section 8).
Repair
The work necessary to restore a vessel to a condition suitable for safe operation at the design conditions. If any of the restorative work results in a change to the design temperature, minimum design metal temperature (MDMT), or MAWP, the work shall be considered an alteration and the requirements for rerating shall be satisfied. Any welding, cutting, or grinding operation on a pressure-containing component not specifically considered an alteration is considered a repair.
Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global StandardsRepair
Action(s) performed on a nonconforming product to make it acceptable for the intended use.- NOTE: 1 Repair within the scope of this document includes remanufacture as defined by other API product specifications.
- NOTE: 2 The distinction between repair and remanufacture may be further specified within API product specifications.
Repair
The maximum uplift force during spud can extraction.
Source: API STANDARD 18LCM, Product Life Cycle Management System Requirements for the Petroleum and Natural Gas Industries, First Edition, April 2017. Global StandardsRepair
Process of disassembly, inspection, reassembly, and testing of drill-through equipment, with or without the replacement of parts in order to correct failed or worn components.- NOTE: Repair does not include machining, welding, heat treating, or other manufacturing operations of component parts.
Repair
The work necessary to restore a vessel to a condition suitable for safe operation at the design conditions. If any of the restorative work results in a change to the design temperature, MDMT, or MA WP, the work shall be considered an alteration and the requirements for rerating shall be satisfied. Any welding, cutting or grinding operation on a pressure-containing component not specifically considered an alteration is considered a repair. Source: API 510, Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration Downstream Segment, Ninth Edition, June 2006. Global StandardsRepair
Action performed on equipment that involves replacement of parts, other than expendable parts, but excludes remanufacture. 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 StandardsRepair
- Activity involving disassembly, reassembly and testing of wellhead and christmas tree equipment with or without the replacement of parts other than bodies. NOTE: Repair does not include machining, welding, heat treating, other manufacturing operations or the replacement of bodies.
Repair
Removal of defects from, and refurbishment of, a component or assembly by welding during the manufacturing process.- NOTE: The term “repair,” as referred to in this specification, applies only to the repair of defects in materials during the manufacture of new equipment.
Repair
Removal of defects from, and refurbishment of, a component or assembly by welding, during the manufacture of new equipment. NOTE The term “repair,” as referred to in this standard, applies only to the repair of defects in materials during the manufacture of new equipment. Source: API SPEC 8C, Drilling and Production Hoisting Equipment (PSL 1 and PSL 2), Fifth Edition, April 2012. Global StandardsRepair
Activity involving disassembly, reassembly, or replacement of components and testing of equipment. NOTE: Repair does not include machining, welding, heat treating, or other manufacturing operations. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsRepair
A “repair” is meant to be an action to correct a single failure or a few failures, normally on-site. “Overhaul” means a comprehensive repair of several failures, or one major failure requiring extensive work, or complete refurbishment of an equipment subunit. Typically, such maintenance is undertaken in a workshopSource(s). Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global StandardsRepair
The structural work necessary to restore a platform to a condition deemed fit-for-purpose. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global StandardsRepair
Action to restore faulty equipment to its fully serviceable condition complying with the relevant standard. Source: IEC 60079-19:2015, Explosive atmospheres – Part 19: Equipment repair, overhaul and reclamation, Edition 3.1, March 2015. Global StandardsRepair
Repair means coating restoration work of a longer term nature, usually performed during ship’s dry-docking or scheduled repair period (ship idle) to restore the “FAIR” or “POOR” coating condition to “GOOD” condition. This will usually require specialized manpower and equipment such as sand blasting equipment, operators and dehumidifiers. Source: IMO MSC.1/Circ.1330, Guidelines for maintenance and repair of protective coatings, 11 June 2009, International Maritime Organization. Regulatory GuidanceRepair Clamp
Definition(s)
Repair clamp
Clamp that is positioned over a damaged area of flexible pipe as a means to repair such an area. Source: API RP 17L2, Recommended Practice for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global StandardsRepair Clamps
Definition(s)
Repair clamps
Repair clamps are used on areas of the flexible pipe where damage has been caused. Source: API RP 17L2, Recommended Practice for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global StandardsRepair Facility
Definition(s)
Repair Facility
Facility providing a service that consists of repairs, overhauls, or reclamations of explosion protected equipment who may be the manufacturer, the user or a third party (repair agency). Source: IEC 60079-19:2015, Explosive atmospheres – Part 19: Equipment repair, overhaul and reclamation, Edition 3.1, March 2015. Global StandardsRepair Level
Definition(s)
Repair Level
Level to which equipment will be repaired or remanufactured in compliance with this International Standard. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global StandardsRepair Organization
Definition(s)
Repair Organization
Any of the following:- an owner/user of piping systems who repairs or alters his or her own equipment in accordance with API 570,
- a contractor whose qualifications are acceptable to the owner/user of piping systems and who makes repairs or alterations in accordance with API 570,
- an organization that is authorized by, acceptable to, or otherwise not prohibited by the jurisdiction and who makes repairs in accordance with API 570.
Repair Organization
Any one of the following that makes repairs in accordance with this inspection code:- the holder of a valid ASME Certificate of Authorization that authorizes the use of an appropriate ASME Code symbol stamp;
- the holder of another recognized code of construction certificate that authorizes the use of an appropriate construction code symbol stamp;
- the holder of a valid R-stamp issued by the National Board for repair of pressure vessels;
- the holder of a valid VR-stamp issued by the National Board for repair and servicing of relief valves;
- an owner or user of pressure vessels and/or relief valves who repairs his or her own equipment in accordance with this code;
- a repair contractor whose qualifications are acceptable to the pressure vessel owner or user;
- an individual or organization that is authorized by the legal jurisdiction to repair pressure vessels or service relief devices.
Repair Organization
Anyone of the following who makes repairs in accordance with the inspection code:- The holder of a valid ASME Certificate of Authorization that authorizes the use of an appropriate ASME Code symbol stamp (e.g. U-stamp).
- The holder of a valid R-stamp issued by the National Board.
- An owner or user of pressure vessels who repairs his or her own equipment.
- A contractor whose qualifications are acceptable to the pressure-vessel owner or user.
- An individual or organization that is authorized by the legal jurisdiction.
Repair Weld
Definition(s)
Repair Weld
Welding performed to correct a nonconformance
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsRepairer/Remanufacturer
Definition(s)
Repairer/Remanufacturer
Principal agent in the repair and remanufacture of wellhead and christmas tree equipment who chooses to be in compliance with this International Standard. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global StandardsReplacement
Definition(s)
Replacement
The process whereby a volume of fluid equal to the volume of steel in tubulars and tools withdrawn from the well bore is returned to the well bore. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsReplacement Part
Definition(s)
Replacement Part
Part used to repair/remanufacture a piece of equipment that meets the wellhead and christmas tree requirement for the applicable repair/remanufacture level. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global StandardsReport
Definition(s)
Report
score report that contains detailed examination performance information, such as strengths and weaknesses Source: ISO/IEC TS 17027:2014, Conformity assessment – Vocabulary related to competence of persons used for certification of persons, Global StandardsReport by Exception
Definition(s)
Report by Exception
RTU sends information to the Host when data has changed by a specified amount. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsReportable
Definition(s)
Recordable
For the purpose of the tables in this section, the word “reportable” means that a test shall be performed and documentation shall be provided to the purchaser of the equipment in accordance with 4.8 or 4.9.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards