Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Dealing
Definition(s)
Dealing
Dealing means a dealing to which Part 4.6 applies. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDebris
Definition(s)
Debris
In sections 26 and 28, "debris" means any installation or structure that was put in place in the course of any work or activity required to be authorized under paragraph 5(1)(b) and that has been abandoned without such authorization as may be required by or pursuant to this Act, or any material that has broken away or been jettisoned or displaced in the course of any such work or activity. Source: Canada Oil and Gas Operations Act, R.S.C., 1985, c. O-7, Canada, current to April 29, 2013. LegislationDebris
In sections 167 and 170, “debris” means any installation or structure that was put in place in the course of any work or activity required to be authorized under paragraph 142(1)(b) and that has been abandoned without such authorization as may be required by or pursuant to this Part, or any material that has broken away or been jettisoned or displaced in the course of any such work or activity. Source: Canada-Nova Scotia Offshore Petroleum Resources Accord Implementation Act, S.C. 1988, c. 28, Canada, current to May 26, 2013. LegislationDecision
Definition(s)
Decision
Decision has the same meaning as in the Administrative Appeals Tribunal Act 1975. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDeclared Greenhouse Gas Facility
Definition(s)
Declared greenhouse gas facility
Declared greenhouse gas facility has the meaning given by section 18. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDeclared Petroleum Exploration Permit
Definition(s)
Declared petroleum exploration permit
Declared petroleum exploration permit has the meaning given by section 101. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDeclared Petroleum Production Licence
Definition(s)
Declared petroleum production licence
Declared petroleum production licence has the meaning given by section 164. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDeclared Petroleum Retention Lease
Definition(s)
Declared petroleum retention lease
Declared petroleum retention lease has the meaning given by section 138. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDeepest Subdivision Draught (ds)
Definition(s)
Deepest Subdivision Draught (ds)
Deepest subdivision draught (ds) is the waterline which corresponds to the summer load line draught of the ship. <Chapter II-1, regulation 2>. Source: IMO Resolution MSC.216(82), amendments to the International Convention for the Safety of Life at Sea, 1974, as amended, 8 December 2006, International Maritime Organization. LegislationDefeat Device
Definition(s)
Defeat Device
Defeat device means a device which measures, senses, or responds to operating variables (e.g., engine speed, temperature, intake pressure or any other parameter) for the purpose of activating, modulating, delaying or deactivating the operation of any component or the function of the emission control system such that the effectiveness of the emission control system is reduced under conditions encountered during normal operation, unless the use of such a device is substantially included in the applied emission certification test procedures. Source: Resolution MEPC.176(58), amendments to the Annex of the Protocol of 1978 relating to the International Convention for the Prevention of Pollution from Ships (Revised MARPOL Annex VI), 10 October 2008, International Maritime Organization. LegislationDelineation Well
Definition(s)
Delineation Well
In these Regulations, “delineation well”, “development well” and “exploratory well” have the same meaning as in subsection 101(1) of the Canada Petroleum Resources Act. Source: Canada Oil and Gas Drilling and Production Regulations, SOR/2009-315, February 2013. RegulationsDelineation Well
“Delineation well” means a well that is so located in relation to another well penetrating an accumulation of petroleum that there is a reasonable expectation that another portion of that accumulation will be penetrated by the first-mentioned well and that the drilling is necessary in order to determine the commercial value of the accumulation. Source: Drilling and Production Guidelines, The Canada-Nova Scotia Offshore Petroleum Board and Canada-Newfoundland and Labrador Offshore Petroleum Board, Canada, March 31, 2011. Regulatory Guidance Source: Canada Petroleum Resources Act, R.S.C. 1985, c. 36 (2nd Supp.), current to April 29, 2013. Legislation Source: Canada-Nova Scotia Offshore Petroleum Resources Accord Implementation Act, S.C. 1988, c. 28, Canada, current to May 26, 2013. LegislationDelineation Well
In these Regulations, “delineation well”, “development well” and “exploratory well” have the same meaning as in subsection 122(1) of the Act. Source: Nova Scotia Offshore Petroleum Drilling and Production Regulations, SOR/2009-317, Canada, current to May 31, 2012. RegulationsDemise Charter
Definition(s)
Demise Charter
Demise charter has the same meaning as in section 2(1) of the Ship Registration Act 1992. Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationDepartment
Definition(s)
Department
Department―the Department of Conservation of the state of Louisiana. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. RegulationsDepartment
"Department" means the Department of Workforce Services. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. RegulationsDepartment
Department means the department of State that, with the authority of the Prime Minister, is for the time being responsible for the administration of this Act. Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationDepartmental Medical Practitioner
Definition(s)
Departmental Medical Practitioner
Departmental medical practitioner means a person for the time being appointed under section 34(1). Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationDepth (DS)
Definition(s)
Depth (DS)
“Depth (DS)” is the moulded depth, in metres, measured at mid-length to the upper deck at side. For the purpose of the application, “upper deck” means the highest deck to which the watertight transverse bulkheads except aft peak bulkheads extend. <Annex 1, regulation 12A>. Source: Resolution MEPC.141(54), amendments to the Annex of the Protocol of 1978 relating to the International Convention for the Prevention of Pollution from Ships, 1973 (Amendments to regulation 1, addition to regulation 12A, consequential amendments to the IOPP Certificate and amendments to regulation 21 of the revised Annex I of MARPOL 73/78), 24 March 2006, International Maritime Organization. LegislationDepth for Freeboard (D)
Definition(s)
Depth for Freeboard (D)
Depth for freeboard (D) (a) The depth for freeboard (D) is the moulded depth amidships, plus the freeboard deck thickness at side. (b) The depth for freeboard (D) in a ship having a rounded gunwale with a radius greater than 4% of the breadth (B) or having topsides of unusual form is the depth for freeboard of a ship having a midship section with vertical topsides and with the same round of beam and area of topside section equal to that provided by the actual midship section. <Chapter I, regulation 3>. Source: IMO Resolution MSC.143(77), amendments to Annex B to the 1988 Load Lines Protocol, 5 June 2003, International Maritime Organization. LegislationDepth of Water
Definition(s)
Depth of Water
Depth of water means the charted depth. <Annex II, Chapter 1, Regulation 1>. Source: Resolution MEPC.118(52), amendments to the Annex of the Protocol of 1978 relating to the International Convention for the Prevention of Pollution from Ships, 1973 (Revised Annex II of MARPOL 73/78), 15 October 2004, International Maritime Organization. LegislationDeputy Registrar
Definition(s)
Deputy Registrar
“Deputy Registrar” means such person as the Board may designate as the Deputy Registrar for the purposes of this Division; directeur adjoint. Source: Canada-Nova Scotia Offshore Petroleum Resources Accord Implementation Act, S.C. 1988, c. 28, Canada, current to May 26, 2013. LegislationDeputy Registrar
“Deputy Registrar” means- in relation to any area in respect of which the Minister of Natural Resources has administrative responsibility for the natural resources therein, such person as that Minister may designate, and
- in relation to any area in respect of which the Minister of Indian Affairs and Northern Development has administrative responsibility for the natural resources therein,
Derived
Definition(s)
Derived
Derived:- in relation to a petroleum title—has the meaning given by clause 8A; or
- in relation to a greenhouse gas title—has the meaning given by clause 8B.
Design Pressure
Definition(s)
Design Pressure
Purchaser nominated maximum pressure to which a piping system is designed to operate at the nominated design temperature (Tdes) and for the nominated design life (Ldes).- Note: 1 to entry: Pdes is typically considered as a sustained pressure, though an additional Pdes occasional can also be nominated. Pdeswill be selected based on the maximum operating pressure plus a purchaser selected uplift.
- to accommodate pressure uncertainty,
- to avoid triggering of pressure safety devices,
- to match the rating of attached piping or equipment and d) to provide a design margin for other purposes.
Design Pressure
For each design condition, maximum fluid temperature that can be reached during service. 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 StandardsDesign Pressure (of a piping component)
The pressure at the most severe condition of coincident internal or external pressure and temperature (minimum or maximum) expected during service. It is the same as the design pressure defined in ASME B31.3 and other code sections and is subject to the same rules relating to allowances for variations of pressure or temperature or both.
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 StandardsDesign Pressure
Pressure, together with the design temperature, used to determine the minimum permissible thickness or physical characteristic of each component, as determined by the design rules of the pressure design code.- NOTE: The design pressure is selected by the user to provide a suitable margin above the most severe pressure expected during normal operation at a coincident temperature, and it is the pressure typically specified on the purchase order. The design pressure is equal to or less than the MAWP (the design pressure can be used as the MAWP in cases where the MAWP has not been established).
Design Pressure
Maximum sustained difference between internal pressure and external pressure during normal operations, referred to a specified elevation. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global StandardsDesign Pressure
Maximum difference between internal pressure and external pressure that is unlikely to be exceeded during the life of the riser, referred to a specified reference height.- NOTE: Design pressure is often named maximum allowable pressure or rated working pressure or maximum allowable.
- EXAMPLE: Design pressure is the maximum pressure considering shut-in pressure at the wellhead (seabed) or at the top of the riser with subsea valves open, maximum well fracturing pressure, maximum well injection pressure, maximum surge pressure or maximum well kill pressure.
Design Pressure
Maximum pressure for which the system or component was designed for continuous usage. Source: API SPEC 17F, Specification for Subsea Production Control Systems, Second Edition, December 2006 (Reaffirmed April 2011). Global StandardsDesign Pressure
Maximum pressure ratings for a pipe or vessel based on its specified minimum yield strength (SMYS), diameter and wall thickness, operation zone, and weld joint type.. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsDesign Pressure
Minimum or maximum pressure, inclusive of operating pressure, surge pressure including shut-in pressure where applicable, vacuum conditions and static pressure head. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global StandardsDesign Pressure
Pressure, together with the design temperature, used to determine the minimum permissible thickness or physical characteristic of each component, as determined by the design rules of the pressure-design code. NOTE The design pressure is selected by the user to provide a suitable margin above the most severe pressure expected during normal operation at a coincident temperature, and it is the pressure specified on the purchase order. The design pressure is equal to or less than the MAWP (the design pressure can be used as the MAWP in cases where the MAWP has not been established). Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global StandardsDesign Pressure
Design pressure means the hydrostatic pressure for which each structure or appliance assumed watertight in the intact and damage stability calculations is designed to withstand. . <Chapter II-1, regulation 2>. Source: IMO Resolution MSC.216(82), amendments to the International Convention for the Safety of Life at Sea, 1974, as amended, 8 December 2006, International Maritime Organization. LegislationDesignated Agreement
Definition(s)
Designated agreement
Designated agreement has the meaning given by section 32. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDesignated Authority
Definition(s)
Designated Authority
Designated Authority:- means a person who, at any time before the commencement of Part 6.10, was a Designated Authority (within the meaning of this Act); and
- when used in the expression the Designated Authority, means a person who, at any time before the commencement of Part 6.10, was the Designated Authority (within the meaning of this Act) for the offshore area concerned.
Designated Coastal Waters
Definition(s)
Designated coastal waters
Designated coastal waters, in relation to a State or the Northern Territory, has the meaning given by section 644. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDesignated coastal waters
Designated coastal waters, in relation to a State or the Northern Territory, has the same meaning as in Part 6.9. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationDesignated coastal waters
- For the purposes of this Part, designated coastal waters, in relation to a State or the Northern Territory, means:
- so much of the scheduled area for that State or Territory as consists of the territorial sea; and
- any area that:
- is within the scheduled area for that State or Territory; and
- is on the landward side of the territorial sea; and
- was, immediately before the commencement of the relevant State or Territory PSLA, the subject of a petroleum exploration permit under the repealed Petroleum (Submerged Lands) Act 1967.
- For the purposes of subsection (1), assume that the breadth of the territorial sea of Australia had never been determined or declared to be greater than 3 nautical miles, but had continued to be 3 nautical miles.
- Paragraph (1)(b) has effect subject to subsection (4).
- For the purposes of this Part, if (whether before or after the commencement of this subsection) an area that is within the designated coastal waters of a State or Territory because it is described in subparagraphs (1)(b)(i), (ii) and (iii) became or becomes an area that is:
- not the subject of a petroleum exploration permit under the relevant State or Territory PSLA; and
- not the subject of a petroleum retention lease under the relevant State or Territory PSLA; and
- not the subject of a petroleum production licence under the relevant State or Territory PSLA; and
- not the subject of an application for a petroleum retention lease or petroleum production licence under the relevant State or Territory PSLA;
Designated Oil or Gas
Definition(s)
Designated Oil or Gas
“Designated oil or gas” means oil or gas, or both, or any quality or kind thereof, that is the subject of an order made pursuant to subsection 124(1); pétrole ou gaz désigné. Source: National Energy Board Act, R.S.C., 1985, c. N-7, Canada, current to April 29, 2013. LegislationDesignated Province or Area
Definition(s)
Designated Province or Area
“Designated province or area” means a province or the offshore area or both, as referred to in an order made pursuant to subsection 124(1); région designee. Source: National Energy Board Act, R.S.C., 1985, c. N-7, Canada, current to April 29, 2013. LegislationDesignated Work Group
Definition(s)
Designated work group
Designated work group has the meaning given in clause 3 of Schedule 3 to the Act. Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. RegulationsDesignated work group
Designated work group means:- a group of members of the workforce at a facility that is established as a designated work group under clause 19 or 20; or
- that group as varied in accordance with clause 21 or 22.
Detection
Definition(s)
Detection
Detection is the determination of the location of survivors or survival craft. <Chapter III, Part A, regulation 3>. Source: IMO Resolution MSC.47(66), adoption of amendments to the International Convention for the Safety of Life at Sea (SOLAS), 1974, 4 June 1996, International Maritime Organization. LegislationDetection Agent
Definition(s)
Detection agent
Detection agent means a substance, whether in a gaseous or liquid state, that: when added to:- another substance; or
- a mixture of other substances;