Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Green Mining Installation
Definition(s)
Green Mining Installation
“GREEN MINING INSTALLATION” is an installation with a maximum of 25 persons on board. Minimum SAR warning time needed for a “GREEN MINING INSTALLATION” is 2 hours until possible impact. Source: NOGEPA Industrial Guideline No. 20, Alerting Procedure SAR Helicopter for Drifting Vessel (NUC) Offshore, Netherlands, Version 0, January 2009. Global StandardsGreenfield
Definition(s)
Greenfield
Project a new project not following a prior project or work. Source: DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global StandardsGrind
Definition(s)
Grind (Verb)
Remove material from a surface by abrading, e.g. with a grinding wheel or file. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsGrind (Noun)
Area where metal was removed with an abrasive wheel in the process of evaluation or repair on an imperfection. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global StandardsGrind, Probe
Definition(s)
Grind, Probe
Grinding performed to explore or determine the depth of an imperfection. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsGrind, Radius
Definition(s)
Grind, Radius
Grinding performed to remove sharp edges and/or abrupt changes in the wall thickness around exploratory grinds or imperfections. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsGrind, Removal
Definition(s)
Grind, Removal
Grinding performed to remove an imperfection or defect and make the product comply with the appropriate specification. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsGrip Length
Definition(s)
Grip Length
Combined thickness of all the elements clamped together by the bolts and nuts, including washers, gaskets and joint members. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsGross Structural Discontinuity
Definition(s)
Gross Structural Discontinuity
Structural or material discontinuity which affects the stress or strain distribution across the entire wall thickness over a region of significant area. EXAMPLE End-to-pipe junction, connector-to-pipe junction, the junction of two pipes of different diameters, thickness or material, or a stiffener-to-pipe junction. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsGround Anchor
Definition(s)
Ground anchor (deadman)
Static holding device installed in the ground separate from the rig structure and to which guyline(s) may be attached. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global StandardsGround Flare
Definition(s)
Ground Flare
Non-elevated flare.- NOTE: A ground flare is normally an enclosed flare but can also be a ground multi-burner flare or a burn-pit.
Ground Motions
Definition(s)
Ground Motions
Accelerations, velocities, or displacements of the ground produced by seismic waves radiating away from earthquake sources. NOTE A fixed offshore structure is founded in or on the seabed and consequently only seabed motions are of significance. The term ground motions is used rather than seabed motions for consistency of terminology with seismic design for onshore structures. Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standardsground, v, US
Definition(s)
ground, v, US
Provide electrical contact with earth. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsGrounded
Definition(s)
Grounded (grounding)
Connected (connecting) to ground or to a conductive body that extends the ground connection (NFPA 780). Source: API RP 545 Recommended Practice for Lightning Protection of Aboveground Storage Tanks for Flammable or Combustible Liquids, First Edition, October 2009. Global StandardsGrounded (earthed)
Connected to earth or to some conducting body that serves in place of earth. Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards Source: API RP 14F, Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class 1, Division 1 and Division 2 Locations, Fifth Edition, July 2008. Global StandardsGrounding Clamp
Definition(s)
Grounding Clamp
Metal fitting attached to the pipe component to provide an electrical connection to earth. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsGroundwater Depression Area
Definition(s)
Groundwater Depression Area
That area of an aquifer where abstraction has had an impact on the stored depression area quantity of water by lowering hydraulic heads. Source: Identifying and assessing water sources: Guidance document for the onshore oil and gas industry, International Petroleum Industry Environmental Conservation Association (IPIECA), 2014. Global StandardsGroundwater Recharge Area
Definition(s)
Groundwater Recharge Area
That area of the land surface where precipitation or other sources of recharge area water recharge an aquifer. Source: Identifying and assessing water sources: Guidance document for the onshore oil and gas industry, International Petroleum Industry Environmental Conservation Association (IPIECA), 2014. Global StandardsGroup
Definition(s)
Group
Group of electrical equipment for explosive atmospheres> classification of electrical equipment related to the explosive atmosphere for which it is to be used Note 1 to entry: Electrical equipment for use in explosive atmospheres is divided into three groups:- Group I: electrical equipment for mines susceptible to firedamp;
- Group II (which can be divided into subgroups): electrical equipment for places with an explosive gas atmosphere, other than mines susceptible to firedamp;
- Group III (which can be divided into subgroups): electrical equipment for places with an explosive dust atmosphere.
Group I Apparatus
Definition(s)
Group I Apparatus (Types of Instruments)
Apparatus for mines susceptible to firedamp. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global StandardsGroup II Apparatus
Definition(s)
Group II Apparatus (Types of Instruments)
Apparatus for places with a potentially explosive atmosphere, other than mines susceptible to firedamp. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global StandardsGRP
Definition(s)
GRP
Glass-reinforced plastic. Source: API RP 17L2, Recommended Practice for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global StandardsGRP
Glass-fibre-Reinforced Plastic. Source: ISO 21457:2010, Petroleum and natural gas industries — Materials selection and corrosion control for oil and gas production systems, First Edition,September 2010. Global StandardsGRUP
Definition(s)
GRUP
Glass-fibre-reinforced unsaturated polyster. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsGRUP
Unsaturated polyester resin-based composite that is reinforced with glass fibre. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsGRVE
Definition(s)
GRVE
Glass-fibre-reinforced vinyl ester. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsGRVE
Epoxy vinyl ester resin-based composite that is reinforced with glass fibre. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsGTL
Definition(s)
GLT
Gas to liquid. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsGuarded
Definition(s)
Guarded
Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers or casings, barrier rails, or screens to eliminate the possibility of accidental contact with or dangerous approach by persons, animals, or objects. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global StandardsGuarded
Shielded, fenced, enclosed or otherwise protected to prevent injury to employees. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. RegulationsGuarded
"Guarded" means covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers or casings, barrier rails, safety bars, or screens, to eliminate the possibility of accidental contact with, or dangerous approach by, persons or objects. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. RegulationsGuidance Note
Definition(s)
Guidance note
Information in the standard added in order to increase the understanding of the requirements. Sources: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsGuidance note
Contains advice which is not mandatory for the assignment or retention of class, but with which the Society, in light of general experience, advises compliance. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global StandardsGuide
Definition(s)
Guide
person appointed by the client to assist the audit team Source: ISO/IEC 17021:2011 (E) – Conformity assessment – Requirements for bodies providing audit and certification of management systems . Global StandardsGuide
person appointed by the auditee to assist the audit team. Source: ISO 19011:2011 (E) – Guidelines for auditing management system. Global StandardsGuide Funnel
Definition(s)
Guide Funnel
Tapered enlargement at the end of a guidance member to provide primary guidance over another guidance member. Source: API SPEC 17D, Design and Operation of Subsea Production Systems—Subsea Wellhead and Tree Equipment, Upstream Segment, Second Edition May 2011 (Errata September 2011). Global StandardsGuideline
Definition(s)
Guideline
Recommendation of recognized practice to be considered in conjunction with applicable statutory requirements, industry standards, standard practices and philosophies. Source: API Recommended Practice 17H, Remotely Operated Tools and Interfaces on Subsea Production Systems, Second Edition, June 2013 (Addendum 1, October 2014). Global Standards Source: API RP 17H, Remotely Operated Vehicle (ROV) Interfaces on Subsea Production Systems, First Edition, July 2004 (Reaffirmed January 2009). Global StandardsGuideline
Taut line from the seafloor to the surface for the purpose of guiding equipment to the seafloor structure. Source: API SPEC 17D, Design and Operation of Subsea Production Systems—Subsea Wellhead and Tree Equipment, Upstream Segment, Second Edition May 2011 (Errata September 2011). Global StandardsGuidelineless Reentry
Definition(s)
Guidelineless Reentry
Establishment of pressure containing connection between the BOP stack and the subsea wellhead or between the LMRP and the lower stack using a TV image and/or acoustic signals instead of guidelines to guide the orientation and alignment.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards