Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Grounding 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 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 StandardsGradient
Definition(s)
Gradient
Slope of internal pressure over time, on a logarithmic-logarithmic scale, of a static regression curve.- Note: 1 to entry: The slope, although negative, is published and used as a positive number.
Glued Joint
Definition(s)
Glued Joint
Rigid type of joint between two components made using an adhesive.- Note: 1 to entry: An adhesive joint generally consists of a slightly conical (tapered) bell end and a machined (cylindrical or tapered) spigot end.
Glass-fibre-reinforced vinyl ester
Definition(s)
Glass-fibre-reinforced vinyl ester
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 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 StandardsGlass-fibre-reinforced unsaturated polyster
Definition(s)
Glass-fibre-reinforced unsaturated polyster
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 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 StandardsGlass-fibre-reinforced epoxy
Definition(s)
Glass-fibre-reinforced epoxy
Epoxy 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 StandardsGel Coat
Definition(s)
Gel Coat
Quick-setting resin applied either a) to the surface of a mould and gelled before lay-up or b) to the exterior of a laminate as part of the external corrosion barrier.- Note: 1 to entry: The gel coat becomes an integral part of the finished laminate, and is usually used to provide specific service characteristics [see liner (3.2.69)].
Gangway Axis
Definition(s)
Gangway Axis
- X axis: principal axis oriented along the length of the gangway.
- Y axis: secondary axis, perpendicular to X axis, oriented across the length of the gangway and in the floor/walkway plane.
- Z axis: secondary axis, perpendicular to the plane defined by X and Y axis.
Gangway (assembly)
Definition(s)
Gangway (assembly)
System intended to transfer personnel and cargo between 2 offshore vessels, typically including a bridge and a pedestal.
Source: Offshore Gangways, DNVGL-ST-0358, DNV GL, September 2017. Global StandardsGPO
Definition(s)
GPO
Group policy object. Source: DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. 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 StandardsGate Search
Definition(s)
Gate Search
The routine inspection of persons and vehicles entering or leaving the facility. Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global StandardsGuard
Definition(s)
Guard
Gateway that is interposed between two networks (or computers or other information systems) operating at different security levels (one network is usually more secure than the other) and is trusted to mediate all information transfers between the two networks, either to ensure that no sensitive information from the more secure network is disclosed to the less secure network, or to protect the integrity of data on the more secure network [11]. Source: ANSI/ISA–99.00.01–2007, Security for Industrial Automation and Control Systems, Part 1: Terminology, Concepts, and Models, 29 October 2007. National StandardGeographic Site
Definition(s)
Geographic Site
Subset of an enterprise’s physical, geographic, or logical group of assets.- NOTE: A geographic site may contain areas, manufacturing lines, process cells, process units, control centers, and vehicles and may be connected to other sites by a wide area network.
Gateway
Definition(s)
Gateway
Relay mechanism that attaches to two (or more) computer networks that have similar functions but dissimilar implementations and that enables host computers on one network to communicate with hosts on the other [11].- NOTE: Also described as an intermediate system that is the translation interface between two computer networks.
G
Definition(s)
g
Acceleration of gravity.Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards
G
Soil shear modulus.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards
Gauge, Downhole
Definition(s)
Gauge, Downhole
A device designed to measure downhole parameters such as pressure and/or temperature.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsGauge Carrier
Definition(s)
Gauge Carrier
Tool used to convey gauges downhole.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsGlass Transition Temperature
Definition(s)
Glass Transition Temperature
Temperature at which the amorphous portion of the polymer undergoes a marked change in properties on passing from the rubbery to glassy state.- Note: 1 to entry: This observed change in properties is associated with the virtual cessation of local molecular motion in the polymer. Below their glass-transition temperature, amorphous polymers have many of the properties associated with ordinary inorganic glasses, while above this temperature the polymers possess rubbery characteristics.
Glass Transition Temperature
The temperature below which elastomers exhibit brittle, glass-like behavior.
Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global StandardsGHS
Definition(s)
GHS
Globally Harmonized System of Classification and Labelling of Chemicals. Source:API RP T-1, Creating Orientation Programs for Personnel Going Offshore, Fifth Edition, November 2016. Global StandardsGoverning Body
Definition(s)
Governing Body
Person or group of people who are accountable for the performance and conformance of the organization.- Note 1 to entry: Governing body can in some jurisdictions be a board of directors.
Governance of Information Security
Definition(s)
Governance of Information Security
System by which an organization’s information security activities are directed and controlled. Source: ISO/IEC 27000:2014, Information technology — Security techniques — Information security management systems — Overview and vocabulary, Third Edition, January 2014. Global StandardsGame Theory
Definition(s)
Game Theory
Branch of applied mathematics that models interactions among agents where an agent’s choice and subsequent success depend on the choices of other agents that are simultaneously acting to maximize their own results or minimize their losses. Sample Usage: Analysts used game theory to model terrorist behavior in response to potential security measures. Annotation:- Game theory can be used in the context of risk analysis to model strategic decisions and interactions of agents with conflicting interests to predict likely decision outcomes.
- A basic application of game theory involves two players and two strategy alternatives.
Galvanic Isolation
Definition(s)
Galvanic Isolation
Arrangement within an item of intrinsically safe apparatus or associated apparatus which permits the transfer of signals or power between two circuits without any direct electrical connection between the two. Source: IEC 60079-14:2013, Explosive atmospheres – Part 14: Electrical installations design, selection and erection, Edition 5.0, November 2013. 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.