LTIF

LTIF

Definition(s)


LTIF

Lost time injury frequency. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global Standards  

Lost time injury frequency (LTIF)

The number of lost time injuries (fatalities + lost work day cases) per 1,000,000 work hours. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global Standards
LTM

LTM

Definition(s)


LTM

Long-term mooring. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  
LTP

LTP

Definition(s)


LTP

Liner top packer. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
Lubrication

Lubrication

Definition(s)


Lubrication

Alternately pumping a relatively small volume of fluid into a closed well bore system and waiting for the fluid to fall toward the bottom of the well. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  
Lubricator

Lubricator

Definition(s)


Lubricator

A fabricated length of tubular pipe equipped with a packoff and bleed valve that is installed to provide access while working on a well under pressure with wireline or other tools and equipment. 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  

Lubricator

A device mounted on the wellhead used to introduce tool strings, chemicals, instruments and perforating guns into a well under pressure. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards  

Lubricator

“Lubricator” sometimes called a bottle, means a special length of casing or tubing placed temporarily above a valve on the top of the casing or tubing head used to run tools or substances into a producing well without having to kill it. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations    
Lubricator Valve

Lubricator Valve

Definition(s)


Lubricator Valve

Valve assembly typically situated below the surface tree and used to isolate the reservoir from the environment when deploying long wireline/coiled tubing tool assemblies. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  
Luffing

Luffing

Definition(s)


Luffing

The operation of changing boom angle in a vertical plane (in effect changing the working radius). Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Seventh Edition, December 2014. Global Standards

Luffing

The operation of changing boom angle in a vertical plane. Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Sixth Edition, May 2007. Global Standards  
LVDT

LVDT

Definition(s)


LVDT

The maximum uplift force during spud can extraction.

Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

LVDT

Linear variable differential transformer (also called linear variable displacement transducer). Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards
LWD

LWD

Definition(s)


LWD

Logging while drilling. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards Source: Deep Water Well Control  Guidlines. IADC Guidelines Source: NOGEPA Industrial Guideline No. 41, Well Construction Process Checklist, Drilling Best Practices, Netherlands, Version 0, December 2011. Global Standards Source: NORSOK D-010, Well integrity in drilling and well operations, Rev. 3, August 2004. Global Standards  

MWD/LWD

Management while drilling / logging while drilling. 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
LWDC

LWDC

Definition(s)


LWDC

Lost day work case. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global Standards  

Lost work day case (LWDC)

An occupational injury or illness, other than a fatal injury, which results in a person being unfit for work on any day after the day of occurrence of the occupational injury. ‘Any day’ includes rest days, weekend days, leave days, public holidays or days after ceasing employment. A LWDC is a recordable event. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global Standards
LWI

LWI

Definition(s)


LWI

Light well intervention. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards
LWRP

LWRP

Definition(s)


LWRP

Lower workover riser package (LRP + EDP) (see ISO 13628-7). 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 Standards    
M

M

Definition(s)


M

Applied bending moment. Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards
M/B

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 Standards  
MA

MA

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 Standards  

MA

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.
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 Standards
MAASP

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 Standards  

MAASP

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 Standards  

MAASP

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 Standards

pMAASP

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 Standards  

MAASP

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 Standards
MAC

MAC

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 Standards

MAC

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 Standards

MAC

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 Standards
Mach Number

Mach 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 Standards

Mach 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 Standards 
Machine

Machine

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 Standards
Machine Learning and Evolution

Machine 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 Standards
Machined Bolts, Screws and Nuts

Machined 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 Standards
Machinery Spaces

Machinery 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 Standards  

Machinery 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 guidance  

Machinery 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. Legislation  

Machinery 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. Legislation  

Machinery 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. Legislation  

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, 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 Standards
Machinery Spaces of Category A

Machinery 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 Standards  

Machinery 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 guidance  

Machinery 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. Legislation  

Machinery 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. Legislation
Macro Virus

Macro 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 Standards
Macrosphere

Macrosphere

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 Standards
Madeup Length

Madeup 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 Standards  
Magnetic Field

Magnetic 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 Standards  
Magnetic Particle

Magnetic 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 Standards  
Magnetic Particle Field Indicator

Magnetic 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 Standards  
Magnetic Poles

Magnetic 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 Standards