Latching Alarm

Latching Alarm

Definition(s)

Latching Alarm (Signals and Alarms)

Alarm that, once activated, requires deliberate action to be deactivated. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Fault Signal

Fault Signal

Definition(s)

Fault Signal (Signals and Alarms)

Audible, visible or other type of output, different from the alarm signal, permitting, directly or indirectly, a warning or indication that the apparatus is not working satisfactorily. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Alarm Set Point

Alarm Set Point

Definition(s)

Alarm Set Point (signals and alarms)

Fixed or adjustable setting of the apparatus that is intended to preset the level of concentration at which the apparatus will automatically initiate an indication, alarm or other output function. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  

Alarm Setpoint

Alarm setpoint is a fixed or adjustable setting at which the system will automatically indicate an alarm. The FSS Code, chapter 16, limits the maximum alarm setpoint to the equivalent of 30% of the lower flammable limit. Source: IMO MSC.1/Circ.1370, Guidelines for the design, construction and testing of fixed hydrocarbon gas detection systems, 22 June 2010, International Maritime Organization. Regulatory Guidance
Sampling Probe

Sampling Probe

Definition(s)

Sampling Probe (Supply of Gas to Instrument)

Separate sample line, which is attached to the apparatus as required, that may or may not be supplied with the apparatus. It is usually short (e.g. in the order of 1 m) and rigid (although it may be telescopic), but it may be connected by a flexible tube to the apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Sample Line

Sample Line

Definition(s)

Sample Line (Supply of Gas to Instrument)

A means by which the gas being sampled is conveyed to the sensor including accessories, e.g. filter, water trap. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Sensor

Sensor

Definition(s)

Sensor

Instrument used to measure operating information such as pressure, flow or temperature. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

Sensor (Types of Instruments)

Assembly in which the sensing element is housed and that may also contain associated circuit components. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  

Sensor

Sensor means any unit external to the S-VDR, to which the S-VDR is connected and from which it obtains data to be recorded. Source: IMO Resolution MSC.163(78), Recommendation on Performance Standards for Shipborne Simplified Voyage Data Recorders (S-VDRs), 17 May 2004, International Maritime Organization. Regulatory Guidance
Remote Sensor

Remote Sensor

Definition(s)

Remote Sensor (Types of Instruments)

Sensor that is not integral to the main body of the apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Stand-Alone Control Unit

Stand-Alone Control Unit

Definition(s)

Stand-Alone Control Unit (Types of Instruments)

Fixed gas detection control units intended to provide meter indication, alarm functions, output contacts and/or alarm signal outputs when utilized with stand-alone gas detection apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Stand-Alone Gas Detection Apparatus

Stand-Alone Gas Detection Apparatus

Definition(s)

Stand-Alone Gas Detection Apparatus (Types of Instruments)

Fixed gas detection apparatus that provide a conditioned electronic signal or output indication to a generally accepted industry standard (such as 4-20 mA or 3-15 psi), intended to be utilized with stand-alone control units or signal processing data acquisition, central monitoring and similar systems, which typically process information from various locations and sources including, but not limited to gas detection apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Transportable Apparatus

Transportable Apparatus

Definition(s)

Transportable Apparatus (Types of Instruments)

Apparatus not intended to be portable but which can be readily moved from one place to another. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Spot-Reading Apparatus

Spot-Reading Apparatus

Definition(s)

Spot-Reading Apparatus (Types of Instruments)

Apparatus intended to be used for short, intermittent or irregular periods of time as required (typically 5 min or less). Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Portable Apparatus

Portable Apparatus

Definition(s)

Portable Apparatus (Types of Instruments)

Spot-reading or continuous duty apparatus that has been designed to be readily carried from place to place and to be used while it is being carried. A portable apparatus is battery powered and includes, but is not limited to a) a hand-held apparatus, typically less than 1 kg, which requires use of only one hand to operate, b) personal monitors, similar in size and mass to the hand-held apparatus, that are continuously operating (but not necessarily continuously sensing) while they are attached to the user, and c) larger apparatus that can be operated by the user while it is carried either by hand, by a shoulder strap or carrying harness and which may or may not have a hand directed probe. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Group II Apparatus

Group II Apparatus

Definition(s)

Group II Apparatus (Types of Instruments)

Apparatus for places with a potentially explosive atmosphere, other than mines susceptible to firedamp. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Group I Apparatus

Group I Apparatus

Definition(s)

Group I Apparatus (Types of Instruments)

Apparatus for mines susceptible to firedamp. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Fixed Apparatus

Fixed Apparatus

Definition(s)

Fixed Apparatus (Types of Instruments)

Apparatus that is intended to have all parts permanently installed. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Diffusion Apparatus

Diffusion Apparatus

Definition(s)

Diffusion Apparatus (Types of Instruments)

Apparatus in which the transfer of gas from the atmosphere to the gas sensor takes place by random molecular movement, i.e. under conditions in which there is no aspirated flow. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Continuous Duty Apparatus

Continuous Duty Apparatus

Definition(s)

Continuous Duty Apparatus (Types of Instruments)

Apparatus that is powered for long periods of time, but may have either continuous or intermittent sensing. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Drilling Program Authorization

Drilling Program Authorization

Definition(s)

Drilling Program Authorization

“Drilling Program Authorization” means an authorization to conduct a drilling program that is issued to a person pursuant to paragraph 5(l)(b) of the Act (autorisation de programme de forage). 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  

Drilling Program Authorization

“Drilling Program Authorization” means an authorization to conduct a drilling program that is issued to a person by the Board pursuant to paragraph 142(1)(b) of the Act; autorisation de programme de forage. Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. Regulations
Aspirated Apparatus

Aspirated Apparatus

Definition(s)

Aspirated Apparatus (types of instruments)

Apparatus that samples the gas by drawing it to the gas sensor – for example, by means of a hand-operated or electric pump. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Alarm-Only Apparatus

Alarm-Only Apparatus

Definition(s)

Alarm-Only Apparatus (types of instruments)

Apparatus having an alarm but not having a meter or other indicating device. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Drilling Installation

Drilling Installation

Definition(s)

Drilling Installation

Drilling installation In these Regulations, “drilling installation”, “drilling rig”, “drilling unit”, “drill site”, “installation”, “production installation”, “production operation”, “production site” and “subsea production system” have the same meaning as in subsection 2(1) of the Canada Oil and Gas Installations Regulations. Source: Canada Oil and Gas Drilling and Production Regulations, SOR/2009-315, February 2013. Regulations Source: Nova Scotia Offshore Petroleum Drilling and Production Regulations, SOR/2009-317, Canada, current to May 31, 2012. Regulations  

Drilling Installation

“Drilling installation” means a drilling unit or a drilling rig and its associated drilling base, and includes any associated dependent diving system (installation de forage). 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 Certificate of Fitness Regulations, SOR/95-187, Canada, current to May 31, 2012. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. Regulations  

Drilling Installation

a drillship, semi-submersible, jack-up or other vessel or structure used in a drilling program and fitted with a drilling rig, and includes the drilling rig and other facilities related to the drilling program that are installed on the vessel or structure. Source: Atlantic Canada Offshore Petroleum Industry, Standard Practice for the Training and Qualifications of Personnel, 2013, Canadian Association of Petroleum Producers, 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
Volume Fraction

Volume Fraction

Definition(s)

Volume Fraction (v/v) (Gas Properties)

Quotient of the volume of a specified component and the sum of the volumes of all components of a gas mixture before mixing, all volumes referring to the pressure and the temperature of the gas mixture. NOTE The volume fraction and volume concentration take the same value if, at the same state conditions, the sum of the component volumes before mixing and the volume of the mixture are equal. However, because the mixing of two or more gases at the same state conditions is usually accompanied by a slight contraction or, less frequently, a slight expansion, this is not generally the case. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Upper Flammable Limit

Upper Flammable Limit

Definition(s)

Upper Flammable Limit

The maximum concentration of a flammable vapor in air (or other oxidant) above which propagation of flame does not occur on contact with an ignition source. The UFL is usually expressed as a volume percentage of the vapor in air Sometimes called the upper explosive limit (UEL). In popular terms, a mixture containing a percentage of flammable vapor above the UFL is too “rich” to burn. Source: API Standards 2217A, Guidelines for Safe Work in Inert Confined Spaces in the Petroleum and Petrochemical Industries, Fourth Edition, July 2009. Global Standards

Upper Flammable Limit (UFL)

The maximum concentration of a vapor in air (or other oxidant) above which propagation of flame does not occur on contact with an ignition source. The upper flammable limit is usually expressed as a volume percentage of the vapor in air. Sometimes called the Upper Explosive Limit (UEL). In popular terms, a mixture containing a percentage of flammable vapor above the UFL is too “rich” to burn and one below the LFL is too “lean” to burn. API RP 2201, Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries, Fifth Edition, July 2003 (Reaffirmed October 2010), Global Standards API RP 2009, Safe Welding, Cutting, and Hot Work Practices in the Petroleum and Petrochemical Industries, Seventh Edition, February 2002 (Reaffirmed, March 2012), Global Standards

Upper Flammable Limit (Gas Properties)

Volume fraction of flammable gas or vapour in air above, which an explosive gas atmosphere does not form, expressed as a percentage (see IEC 60079-20). NOTE This is also known as upper explosive limit (UEL). Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
UFL

UFL

Definition(s)

UFL

Upper flammable limit. Source: API Standards 2217A, Guidelines for Safe Work in Inert Confined Spaces in the Petroleum and Petrochemical Industries, Fourth Edition, July 2009. Global Standards API RP 2201, Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries, Fifth Edition, July 2003 (Reaffirmed October 2010), Global Standards Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  

UFL

The maximum concentration of a flammable vapor in air (or other oxidant) above which propagation of flame does not occur on contact with an ignition source. The UFL is usually expressed as a volume percentage of the vapor in air Sometimes called the upper explosive limit (UEL). In popular terms, a mixture containing a percentage of flammable vapor above the UFL is too “rich” to burn. Source: API Standards 2217A, Guidelines for Safe Work in Inert Confined Spaces in the Petroleum and Petrochemical Industries, Fourth Edition, July 2009. Global Standards

UFL (Gas Properties)

Volume fraction of flammable gas or vapour in air above, which an explosive gas atmosphere does not form, expressed as a percentage (see IEC 60079-20). NOTE This is also known as upper explosive limit (UEL). Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Potentially Explosive Atmosphere

Potentially Explosive Atmosphere

Definition(s)

Potentially Explosive Atmosphere (Gas Properties)

Atmosphere that could become explosive (the danger is a potential one). NOTE This would include an atmosphere with gas concentration currently above UFL, where dilution with air would render it explosive. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Poisons

Poisons

Definition(s)

Poisons (For Sensors) (Gas Properties)

Substances, which lead to temporary or permanent loss of sensitivity of the sensors. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Lower Flammable Limit

Lower Flammable Limit

Definition(s)

Lower Flammable Limit

The minimum concentration of a vapor in air (or other oxidant) below which propagation of flame does not occur on contact with an ignition source. The LFL is usually expressed as a volume percentage of the vapor in air. Sometimes called lower explosive limit (LEL). In popular terms, a mixture containing a percentage of flammable vapor below the LFL is too “lean” to burn. Source:API Standards 2217A, Guidelines for Safe Work in Inert Confined Spaces in the Petroleum and Petrochemical Industries, Fourth Edition, July 2009. Global Standards

Lower Flammable Limit (Gas Properties)

Volume fraction of flammable gas or vapour in air below, which an explosive gas atmosphere does not form, expressed as a percentage (see IEC 60079-20) NOTE This is also known as lower explosive limit (LEL). Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  

Lower Flammable Limit (LFL)

Lower flammable limit (LFL) means the concentration of a hydrocarbon gas in air below which there is insufficient hydrocarbon to support and propagate combustion. Source: IMO MSC.1/Circ.1321, Guidelines for measures to prevent fires in engine-rooms and cargo pump-rooms, 11 June 2009, International Maritime Organization. Regulatory Guidance  

Lower Flammable Limit (LFL)

Lower flammable limit (LFL) is the volume fraction of gas or vapour below which an explosive atmosphere does not form. Also referred to as lower explosive limit (LEL). Source: IMO MSC.1/Circ.1370, Guidelines for the design, construction and testing of fixed hydrocarbon gas detection systems, 22 June 2010, International Maritime Organization. Regulatory Guidance  
Flammable Gas

Flammable Gas

Definition(s)

Flammable Gas

Substance that exists exclusively in the gaseous state at normal atmospheric pressure and temperature and is capable of igniting and burning when mixed with air (oxygen) in the proper proportion and subjected to a source of ignition. Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards

Flammable Gas (Gas Properties)

Gas or vapour which, when mixed with air in a certain proportion, will form an explosive atmosphere. NOTE For the purposes of this standard, the term "flammable gas" includes flammable vapours. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  

Flammable Gas (or Vapour)

Gas or vapour which, when mixed with air in certain proportions, will form an explosive gas atmosphere. Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards  
Drilling Base

Drilling Base

Definition(s)

Drilling Base

“Drilling base” means the stable foundation on which a drilling rig is installed, and includes the ground surface, an artificial island, an ice platform, a platform fixed to the ground or seafloor and any other foundation specially constructed for drilling operations (base de forage). 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 Certificate of Fitness Regulations, SOR/95-187, Canada, current to May 31, 2012. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. Regulations