WSUS

WSUS

Definition(s)


WSUS

Windows server update services. Source:  DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global Standards
WT

WT

Definition(s)


WT

Wall thickness (mathematical symbol: t). Source: API SPEC 17E, Specification for Subsea Umbilicals, Upstream Segment, Fourth Edition, October 2010. Global Standards  
Wye Spool

Wye Spool

Definition(s)


Wye Spool

Spool between the master and swab valves of a TFL tree, that allows the passage of TFL tools from the flowlines into the bores of the tree. 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
XLOT

XLOT

Definition(s)


XLOT

Extended leak off test. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards  

XLOT

Application of pressure by superimposing a surface pressure on a fluid column in order to determine the pressure at which a fracture propagates into the exposed formation and also establishes the fracture closure pressure. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards    
XLPE

XLPE

Definition(s)


XLPE

Crosslinked polyethylene.

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 Standards

Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards

 

XOV

XOV

Definition(s)


XOV

Cross-over valve. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards 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
XT

XT

Definition(s)


XT

Christmas Tree. Source: Norwegian Oil and Gas Association, Guideline No. 135, Recommended Guidelines for Classification and categorization of well control incidents and well integrity incidents, Rev. 4, 27 June 2017, National or Regional Standards

XT

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

XT

Subsea tree. 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
Yarn

Yarn

Definition(s)


Yarn

A generic term for a bundle of untwisted or twisted fibers. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014Global Standards
Yarn Assembly Checklist

Yarn Assembly Checklist

Definition(s)


Yarn Assembly Checklist

A document completed during the yarn assembly process which states the nominal values and records the actual values for each set-up of each step of the process of the yarn. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014Global Standards
Yarn Break Strength

Yarn Break Strength

Definition(s)


Yarn Break Strength

The average breaking load from several yarn break tests. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014Global Standards
Yarn Creep

Yarn Creep

Definition(s)


Yarn Creep

The characteristics of the yarn that undergo a time related non-recoverable increase in length when subjected to sustained load. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014Global Standards
Yarn Elongation

Yarn Elongation

Definition(s)


Yarn Elongation

The average elongation at break from several yarn break tests. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014Global Standards
Yarn Producer

Yarn Producer

Definition(s)


Yarn Producer

The entity which produces the fiber and/or yarn and applies special processes to that yarn before it is received by the rope manufacturer. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014Global Standards
Yarn-on-yarn Abrasion Property

Yarn-on-yarn Abrasion Property

Definition(s)


Yarn-on-yarn Abrasion Property

The average cycles to failure at a designated applied load which the yarn exhibits when tested by the yarn-on-yarn abrasion test method. Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014Global Standards
Yield

Yield

Definition(s)


Yield

Permanent, inelastic deformation. Source: API TR 5C3, Technical Report on Equations and Calculations for Casing, Tubing, and Line Pipe Used as Casing or Tubing; and Performance Properties Tables for Casing and Tubing, Upstream Segment, First Edition, December 2008. Global Standards  
Yield Capacity

Yield Capacity

Definition(s)


Yield Capacity

Maximum load(s) of the connector that cause the primary membrane stress to reach the specified minimum yield stress.

Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards
Yield Strength

Yield Strength

Definition(s)


Yield strength

Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.
  • NOTE: 1 The term is expressed in Newton’s per square millimeter (pounds per square inch) of loaded area.
  • NOTE: 2 All yield strength (YS) specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Yield strength

Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.
  • NOTE: 1 The term is expressed in newtons per square millimeter (pounds per square inch) of loaded area.
  • NOTE: 2 All yield strengths specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

Yield strength

Material specification corresponding to measured tensile stress required to produce a total elongation of 0.5 % of test specimen gauge length. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Yield strength

Stress level, measured at room temperature, at which material plastically deforms and does not return to its original dimensions when the load is released.
  • NOTE: All yield strengths specified in this document are the 0,2 % offset yield strength in accordance with ISO 6892-1 or ASTM A370.
Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Yield strength

Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.
  • NOTE: 1 It is expressed in newtons per square millimetre (pounds per square inch) of loaded area.
  • NOTE: 2 All yield strengths specified in this American National Standard are considered as being the 0,2 % yield offset strength in accordance with ISO 6892.
Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards  

Yield strength

The stress level measured at room temperature, expressed in pounds per square inch of loaded area, at which material plastically deforms and will not return to its original dimensions when the load is released. Yield strengths specified in this standard shall be considered as being the 0.2% yield offset strength per ASTM A 370. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards  

Yield strength

The stress level measured at room temperature, expressed in pounds per square in. of loaded area, at which material plastically deforms and will not return to its original dimensions when the load is released. All yield strengths specified in this standard shall be considered as being the 0.2% yield offset strength per ASTM A 370. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards  

Yield strength

Stress level at which a metal or other material ceases to behave elastically. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global Standards  

Yield strength

Engineering stress at which, by convention, it is considered that plastic elongation of the material has commenced (ASTM E6). NOTE This stress may be specified in terms of: a) a specified deviation from a linear stress–strain relationship, b) a specified total extension attained, or c) maximum or minimum engineering stresses measured during discontinuous yielding. EXAMPLE In API 6A, yield strength values are the 0.2 % offset yield strengths determined from tests conducted in accordance with ASTM A370. In API 5CT, the stress occurs at specified strains (0.5 %, 0.65 %, etc.). Source: API TR 1PER15K-1, Protocol for Verification and Validation of High-pressure High-temperature Equipment, First Edition, March 2013. Global Standards
Yield Stress Bias

Yield Stress Bias

Definition(s)


Yield Stress Bias

Ratio of actual yield stress to specified minimum yield stress. Source: API TR 5C3, Technical Report on Equations and Calculations for Casing, Tubing, and Line Pipe Used as Casing or Tubing; and Performance Properties Tables for Casing and Tubing, Upstream Segment, First Edition, December 2008. Global Standards  
Yielding

Yielding

Definition(s)


Yielding

The permanent deformation of the steel walls of a line or vessel caused when the MOP is exceeded. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Yoke

Yoke

Definition(s)


Yoke

U-shaped piece of soft magnetic material, either solid or laminated, around which a coil is wound to carry a magnetizing current. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Yoke Magnetization

Yoke Magnetization

Definition(s)


Yoke Magnetization

Magnetic field induced in OCTG, or in an area of a OCTG, by means of an external electromagnet shaped like a yoke. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Yr

Yr

Definition(s)


Yr

Year. Source: API SPEC 17F, Specification for Subsea Production Control Systems, Second Edition, December 2006 (Reaffirmed April 2011). Global Standards    
YS

YS

Definition(s)


YS

Yield strength.

Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

YS

Stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is released.
  • NOTE: 1 The term is expressed in Newton’s per square millimeter (pounds per square inch) of loaded area.
  • NOTE: 2 All yield strength (YS) specified in this standard are considered as being the 0.2 % yield offset strength in accordance with ISO 6892 or ASTM A370.

Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Z

Z

Definition(s)


Z

ZULU (Time Scale). Source: NOGEPA Guideline 14, Helideck Operations and Procedures Manual, Netherlands, Version 2, December 2011. Global Standards
Z factor

Z factor

Definition(s)


Z factor

The factor used to compensate for change in density of gas with temperature and pressure not accounted for in the ideal gas law (PV=nRT). Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Zero

Zero

Definition(s)


Zero

Act of setting a dial indicating depth gauge for "zero depth". Past tense is "zeroed". Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Zero Gas

Zero Gas

Definition(s)


Zero Gas (Gas Properties)

Gas recommended by the manufacturer, which is free of flammable gases, and interfering and contaminating substances, the purpose of which is calibration/adjustment of the apparatus zero. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Zombie

Zombie

Definition(s)


Zombie

Computer containing hidden software that enables the machine to be controlled remotely, usually to perform an attack on another computer.
  • NOTE Generally, a compromised machine is only one of many in a botnet, and will be used to perform malicious activities under remote direction.
Source: ISO/IEC 27032:2015, Information technology — Security techniques — Guidelines for cybersecurity, First Edition, July 2012. Global Standards

Zombie

A computer connected to the Internet that has been surreptitiously / secretly compromised with malicious logic to perform activities under remote the command and control of a remote administrator. Extended Definition: A member of a larger collection of compromised computers known as a botnet. 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
Zombie Computer

Zombie Computer

Definition(s)


Zombie Computer

Computer containing hidden software that enables the machine to be controlled remotely, usually to perform an attack on another computer.
  • NOTE Generally, a compromised machine is only one of many in a botnet, and will be used to perform malicious activities under remote direction.
Source: ISO/IEC 27032:2015, Information technology — Security techniques — Guidelines for cybersecurity, First Edition, July 2012. Global Standards
Zone

Zone

Definition(s)


Zone

A method of specifying the probability that a location is made hazardous by the presence, or potential presence, of flammable concentrations of gases and vapors, or combustible mixtures of dusts. 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 Standards  

Zone 0 (IEC)

An area in which an explosive gas atmosphere is present continuously or for long periods. (See IEC 60050, IEV 426-03-03.) 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 Standards  

Zone 0, Class I (NEC)

A Class I, Zone 0 location is a location 1) in which ignitable concentrations of flammable gases or vapors are present continuously; or 2) in which ignitable concentrations of flammable gases or vapors are present for long periods of time, see NEC Section 505.5(B)(1). 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  

Zone 0, Class I (NEC)

A Class I, Zone 0 location is a location 1) in which ignitable concentrations of flammable gases or vapors are present continuously; or 2) in which ignitable concentrations of flammable gases or vapors are present for long periods of time, see NEC Section 505-9(a). 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 Standards  

Zone 0

Place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is present continuously or for long periods or frequently.[IEV 426-03-03, modified] NOTE The MODU code definition is “Zone 0: in which an explosive gas/air mixture is continuously present or present for long periods.” Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards  

Zone 1 (IEC)

An area in which an explosive gas atmosphere is likely to occur in normal operation, see IEC 60050, IEV 426-03-04. 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 Standards  

Zone 1, Class I (NEC)

A Class I, Zone 1 location is a location 1) in which ignitable concentrations of flammable gases or vapors are likely to exist under normal operating conditions; or 2) in which ignitable concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations or because of leakage; or 3) in which equipment is operated or processes are carried on, of such a nature that equipment breakdown or faulty operations could result in the release of ignitable concentrations of flammable gases or vapors and also cause simultaneous failure of electrical equipment in a mode to cause the electrical equipment to become a source of ignition; or 4) that is adjacent to a Class I, Zone 0 location from which ignitable concentrations of vapors could be communicated, unless communication is prevented by adequate positive-pressure ventilation from a source of clean air and effective safeguards against ventilation failure are provided, see NEC Article 505.5(B)(2). 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  

Zone 1, Class I (NEC)

A Class I, Zone 1 location is a location 1) in which ignitable concentrations of flammable gases or vapors are likely to exist under normal operating conditions; or 2) in which ignitable concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations or because of leakage; or 3) in which equipment is operated or processes are carried on, of such a nature that equipment breakdown or faulty operations could result in the release of ignitable concentrations of flammable gases or vapors and also cause simultaneous failure of electrical equipment in a mode to cause the electrical equipment to become a source of ignition; or 4) that is adjacent to a Class I, Zone 0 location from which ignitable concentrations of vapors could be communicated, unless communication is prevented by adequate positive-pressure ventilation from a source of clean air and effective safeguards against ventilation failure are provided, see NEC Article 505-9(b). 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 Standards  

Zone 1

Place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. [IEV 426-03-04, modified] NOTE The MODU code definition is “Zone 1: in which an explosive gas/air mixture is likely to occur in normal operation.” Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards  

Zone 2 (IEC)

An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it does occur, is likely to do so only infrequently and will exist for a short period only, see IEC 60050, IEV 426-03-05. 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 Standards  

Zone 2, Class I (NEC)

A Class I, Zone 2 location is a location 1) in which ignitable concentrations of flammable gases or vapors are not likely to occur in normal operation, and if they do occur, will exist only for a short period; or 2) in which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used, but in which the liquids, gases, or vapors normally are confined within closed containers or closed systems from which they can escape only as a result of accidental rupture or breakdown of the containers or system, or as the result of the abnormal operation of the equipment with which the liquids or gases are handled, processed, or used; or 3) in which ignitable concentrations of flammable gases or vapors normally are prevented by positive mechanical ventilation, but which may become hazardous as the result of failure or abnormal operation of the ventilation equipment; or 4) that is adjacent to a Class I, Zone 1 location, from which ignitable concentrations of flammable gases or vapors could be communicated, unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air, and effective safeguards against ventilation failure are provided, see NEC Section 505.5(B)(3). 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  

Zone 2, Class I (NEC)

A Class I, Zone 2 location is a location 1) in which ignitable concentrations of flammable gases or vapors are not likely to occur in normal operation, and if they do occur, will exist only for a short period; or 2) in which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used, but in which the liquids, gases, or vapors normally are confined within closed containers or closed systems from which they can escape only as a result of accidental rupture or breakdown of the containers or system, or as the result of the abnormal operation of the equipment with which the liquids or gases are handled, processed, or used; or 3) in which ignitable concentrations of flammable gases or vapors normally are prevented by positive mechanical ventilation, but which may become hazardous as the result of failure or abnormal operation of the ventilation equipment; or 4) that is adjacent to a Class I, Zone 1 location, from which ignitable concentrations of flammable gases or vapors could be communicated, unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air, and effective safeguards against ventilation failure are provided, see NEC Section 505-9(c). 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 Standards  

Zone 2

Place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only.[IEV 426-03-05, modified] NOTE 1 In this definition, the word "persist" means the total time for which the flammable atmosphere will exist. This will normally comprise the total of the duration of the release, plus the time taken for the flammable atmosphere to disperse after the release has stopped. NOTE 2 Indications of the frequency of the occurrence and duration may be taken from codes relating to specific industries or applications. NOTE 3 The MODU code definition is “Zone 2: in which an explosive gas/air mixture is not likely to occur, or in which such a mixture, if it does occur, will only exist for a short time.”3  

Zone

“Zone” means any stratum or strata designated by the Minister as a zone, either generally or in respect of any designated area, or any specified well or wells (zone). Source: Canada Oil and Gas Drilling and Production Regulations, C.R.C., c. 1517, February 2013. Regulations  

Zone

“Zone” means any stratum or any sequence of strata and includes, for the purposes of the definition “commingled production”, section 7, subsection 61(2), sections 64 to 66 and 73, subsection 82(2) and section 85, a zone that has been designated as such by the Board under section 4 (couche). Source: Canada Oil and Gas Drilling and Production Regulations, SOR/2009-315, February 2013. Regulations 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  

Zone

Part of a hazardous area based upon the frequency of the occurrence and duration of an explosive gas atmosphere. Source: ISO 13702:2015, Petroleum and natural gas industries — Control and mitigation of fires and explosions on offshore production installations — Requirements and guidelines, Second Edition, August 2015. Global Standards  

Zone

“Zone” means any stratum or any sequence of strata and includes, for the purposes of the definition “commingled production”, section 7, subsection 61(2), sections 64 to 66 and 74, subsection 83(2) and section 86, a zone that has been designated as such by the Board under section 4; couche. Source: Nova Scotia Offshore Petroleum Drilling and Production Regulations, SOR/2009-317, Canada, current to May 31, 2012. Regulations  

Zone

See “security zone

Source: ANSI/ISA–99.00.01–2007, Security for Industrial Automation and Control Systems, Part 1: Terminology, Concepts, and Models, 29 October 2007. National Standard