Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
M/B
Definition(s)
M/B
Make-up/break-out. Source: API RP 5C5, Recommended Practice on Procedures for Testing Casing and Tubing Connections, Third Edition, July 2003 (Reaffirmed August 2010). Global StandardsMA
Definition(s)
MA
Major accident. Source: ISO 17776:2016, Petroleum and natural gas industries — Offshore production installations — Major accident hazard management during the design of new installations, Second Edition, December 2016. Global StandardsMA
Hazardous event that results in- — multiple fatalities or severe injuries; or
- — extensive damage to structure, installation or plant; or
- — large-scale impact on the environment (e.g. persistent and severe environmental damage that can lead to loss of commercial or recreational use, loss of natural resources over a wide area or severe environmental damage that will require extensive measures to restore beneficial uses of the environment)
- Note 1 to entry: In this document, a major accident is the realization of a major accident hazard.
- Note 2 to entry: This definition is intended to incorporate terms such as “major accident” as defined by UK HSE.
MAASP
Definition(s)
MAASP
Maximum Allowable Annulus Surface Pressure at the wellhead. Source: 117 OLF, Norwegian Oil and Gas Association recommended guidelines for Well Integrity, No. 117, Revision No. 4, June 2011. Global StandardsMAASP
Annulus pressure acceptance criteria. Source: 117 OLF, Norwegian Oil and Gas Association recommended guidelines for Well Integrity, No. 117, Revision No. 4, June 2011. Global StandardsMAASP
Greatest pressure that an annulus can contain, as measured at the wellhead, without compromising the integrity of any element of that annulus, including any exposed open-hole formations maximum allowable annulus surface pressure. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global StandardspMAASP
Greatest pressure that an annulus can contain, as measured at the wellhead, without compromising the integrity of any element of that annulus, including any exposed open-hole formations maximum allowable annulus surface pressure. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global StandardsMAASP
Maximum allowable annular surface pressure. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global Standards Source: NORSOK D-010, Well integrity in drilling and well operations, Rev. 3, August 2004. Global StandardsMAC
Definition(s)
MAC
Media access control. Source: DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global StandardsMAC
Defined limits placed on characteristics of materials, products, and services established by the organization to achieve conformity to the manufacturing or servicing requirements. Source: API SPEC Q1, Specification for Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry, Ninth Edition, June 2013 (Errata 2, March 2014). Global StandardsMAC
Manufacturing acceptance criteria. Source: API SPEC Q1, Specification for Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry, Ninth Edition, June 2013 (Errata 2, March 2014). Global StandardsMach Number
Definition(s)
Mach Number
Actual fluid velocity divided by the velocity at which sound waves propagate through the fluid at the associated temperature.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global StandardsMach Number
Ratio of a fluid’s velocity, measured relative to some obstacle or geometric figure, divided by the speed at which sound waves propagate through the fluid. Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global StandardsMachine
Definition(s)
Machine
An assembly of linked parts or components, at least one of which moves, with the appropriate machine actuators, control and power circuits, etc., joined together for a specific application, in particular for the processing, treatment, moving or packing of a material. The term machinery also covers an assembly of machines which, in order to achieve one and the same end, are arranged and controlled so that they function as an integral whole. Source: Verification of Lifting Appliances for the Oil and Gas Industry, DNV-OSS-308, October 2010, Det Norske Veritas AS, Global StandardsMachine Learning and Evolution
Definition(s)
Machine Learning and Evolution
A field concerned with designing and developing artificial intelligence algorithms for automated knowledge discovery and innovation by information systems. Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global StandardsMachined Bolts, Screws and Nuts
Definition(s)
Machined Bolts, Screws and Nuts
Parts manufactured by machining from raw material to generate the bolt, screw head, or the configuration of the nut.
Source: API Specification 20E, Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries, Second Edition, February 2017. Global StandardsMachinery
Definition(s)
Machinery
Machinery means an engine, motor, or other appliance that provides mechanical energy derived from compressed air, the combustion of fuel, electricity, gas, gaseous products, steam, water, wind, or any other source; and includes— (a) any plant by or to which the motion of any machinery is transmitted; and (b) a lifting machine, a lifting vehicle, a machine whose motive power is wholly or partly generated by the human body, and a tractor. Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationMachinery Alarm
Definition(s)
Machinery Alarm
An alarm which indicates a malfunction or other abnormal condition of the machinery and electrical installations. Source: IMO resolution A.1021(26), Code on Alarms and Indicators, 2009, 18 January 2010, International Maritime Organization. Regulatory GuidanceMachinery Space
Definition(s)
Machinery Space
“Machinery space” means a space on an installation where equipment incorporating rotating or reciprocating mechanical equipment in the form of an internal combustion engine, a gas turbine, an electric motor, a generator, a pump or a compressor is located (zone des machines). Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsMachinery Spaces
Definition(s)
Machinery Spaces
Machinery spaces are all machinery spaces of category A and all other spaces containing propelling machinery, boilers and other fired processes, oil fuel units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerating, stabilizing, ventilation and air-conditioning machinery and similar spaces; and trunks to such spaces. Source: IMO Resolution A.1023(26), Code for the Construction and Equipment of Mobile Offshore Drilling Units (2009 MODU Code), 2009. Global StandardsMachinery Spaces
Machinery spaces are all machinery spaces of category A and all other spaces containing propelling machinery, boilers, oil fuel units, steam and internal-combustion engines, generators and major electrical machinery, oil filling station, refrigerating, stabilizing, ventilation and airconditioning machinery, and similar spaces, and trunks to such spaces. Source: Resolution MEPC.119(52), 2004 amendments to the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code), 15 October 2004, International Maritime Organization, Regulatory guidanceMachinery Spaces
Machinery spaces are machinery spaces of category A and other spaces containing propulsion machinery, boilers, oil fuel units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerating, stabilizing, ventilation and air conditioning machinery, and similar spaces, and trunks to such spaces. <Chapter II-2, part A, regulation 3> Source: IMO Resolution MSC.99(73), amendments to the International Convention for the Safety of Life at Sea, 1974, as amended, 5 December 2000, International Maritime Organization. LegislationMachinery Spaces
Machinery spaces are spaces between the watertight boundaries of a space containing the main and auxiliary propulsion machinery, including boilers, generators and electric motors primarily intended for propulsion. In the case of unusual arrangements, the Administration may define the limits of the machinery spaces. <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. LegislationMachinery Spaces
Machinery spaces are all machinery spaces of category A and all other spaces containing propelling machinery, boilers, oil fuel units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerating, stabilizing, ventilation and air conditioning machinery, and similar spaces, and trunks to such spaces. <Chapter II-1, regulation 3>. 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. LegislationMachinery Spaces
Machinery spaces are all machinery spaces of Category ‘A’ and all other spaces containing propelling machinery, boilers and other fired processes, oil fuel units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerating, stabilising, ventilation and air conditioning machinery, and similar spaces, and trunks to such spaces. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 7, Safety Systems, Hazardous Areas and Fire, June 2013, Lloyd’s Register, Global StandardsMachinery Spaces of Category A
Definition(s)
Machinery Spaces of Category A
Machinery spaces of category A are all spaces which contain internal combustion type machinery used either: 1. for main propulsion; or 2. for other purposes where such machinery has in the aggregate a total power of not less than 375 kW; or which contain any oil-fired boiler or oil fuel unit; and trunks to such spaces. Source: IMO Resolution A.1023(26), Code for the Construction and Equipment of Mobile Offshore Drilling Units (2009 MODU Code), 2009. Global Standards Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 7, Safety Systems, Hazardous Areas and Fire, June 2013, Lloyd’s Register, Global StandardsMachinery Spaces of Category A
Machinery spaces of category A are those spaces and trunks to such spaces which contain: .1 internal-combustion machinery used for main propulsion; or .2 internal-combustion machinery used for purposes other than main propulsion where such machinery has in the aggregate a total power output of not less than 375 kW; or .3 any oil-fired boiler or oil fuel unit or any oil fired equipment other than boilers, such as inert gas generators, incinerators etc. Source: Resolution MEPC.119(52), 2004 amendments to the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code), 15 October 2004, International Maritime Organization, Regulatory guidanceMachinery Spaces of Category A
Machinery spaces of category A are those spaces and trunks to such spaces which contain either: .1 internal combustion machinery used for main propulsion; .2 internal combustion machinery used for purposes other than main propulsion where such machinery has in the aggregate a total power output of not less than 375 kW; or .3 any oil-fired boiler or oil fuel unit, or any oil-fired equipment other than boilers, such as inert gas generators, incinerators, etc. <Chapter II-2, part A, regulation 3 >. Source: IMO Resolution MSC.99(73), amendments to the International Convention for the Safety of Life at Sea, 1974, as amended, 5 December 2000, International Maritime Organization. LegislationMachinery Spaces of Category A
Machinery spaces of category A are those spaces and trunks to such spaces which contain: .1 internal combustion machinery used for main propulsion; .2 internal combustion machinery used for purposes other than main propulsion where such machinery has in the aggregate a total power output of not less than 375 kW; or .3 any oil-fired boiler or oil fuel unit. <Chapter II-1, regulation 3>. 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. LegislationMacro Virus
Definition(s)
Macro Virus
A type of malicious code that attaches itself to documents and uses the macro programming capabilities of the documents application to execute, replicate, and spread or propagate itself. Adapted from: CNSSI 4009. Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global StandardsMacrofouling
Definition(s)
Macrofouling
Macrofouling means large, distinct multicellular organisms visible to the human eye such as barnacles, tubeworms, or fronds of algae. Source: Resolution MEPC.207(62), 2011 Guidelines for the control and management of ships' biofouling to minimize the transfer of invasive aquatic species, 15 July 2011, International Maritime Organization. Regulatory GuidanceMacrosphere
Definition(s)
Macrosphere
Ceramic, polymer or composite spheres greater than 1 mm in diameter that form a structural part of composite syntactic foams. Source: API RP 17L2, Recommended Practice for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global StandardsMadeup Length
Definition(s)
Madeup Length
The actual length contributed to a riser string by a made-up riser component (overall component length minus box/pin engagement). Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global StandardsMAE
Definition(s)
MAE
Major Accident Event. Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC Guidelines Source: NOPSEMA Guidance Note: ALARP, N-04300-GN0166, Australia, Revision 4, December 2012. Regulatory Guidance Source: NOPSEMA Guidance Note: Control Measures and Performance Standards, N-04300 GN0271, Australia, Revision 3, December 2011. Regulatory Guidance Source: NOPSEMA Guidance note: Safety Case Lifecycle Management, N04300-GN0087, Australia, Revision 5, December 2012. Regulatory Guidance Source: NOPSEMA Guidance Note: Safety Management Systems, N04300-GN1052, Australia, Revision 0, December 2012. Regulatory GuidanceMagnetic Field
Definition(s)
Magnetic Field
Space around a magnet within which ferromagnetic materials are attracted is called a magnetic field. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsMagnetic Particle
Definition(s)
Magnetic Particle
Finely-divided ferromagnetic material capable of being individually magnetized and attracted to distortions in a magnetic field. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsMagnetic Particle Field Indicator
Definition(s)
Magnetic Particle Field Indicator
Device containing artificial flaws which is used to verify the adequacy or direction, or both, of a magnetic field. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsMagnetic Poles
Definition(s)
Magnetic Poles
Area on a magnetized OCTG where the magnetic field is "leaving or returning", usually at its end when longitudinally magnetized. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsMagnetic Survey
Definition(s)
Magnetic Survey
“Magnetic survey” means a geophysical operation that measures the properties of the earth’s magnetic field; étude magnétique. Source: Canada Oil and Gas Geophysical Operations Regulations, SOR/96-117, Canada, current to April 29, 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Geophysical Operations Regulations, SOR/95-144, Canada, current to May 31, 2012. RegulationsMagnetism
Definition(s)
Magnetism
Ability of a magnet to attract or repel another magnet is called magnetism. Also recognized as a force-field surrounding conductors carrying electric current. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsMagnetizing Force
Definition(s)
Magnetizing Force
Magnetic field strength. NOTE In the Gaussian system, the symbol is Hs and quantities are expressed in oersteds. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsMagnetometer
Definition(s)
Magnetometer
Mechanical or electronic instrument used to measure magnetic field strength. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsMAH
Definition(s)
MAH
Major Accident Hazard.Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards
MAH
Hazard with a potential for causing a major accident (3.37).Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards