Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Unsafe Location
Definition(s)
Unsafe location
An atmospheric pressure relief device discharge point or downstream destructive device (e.g. flare, scrubber) discharge point that results in a potential hazard, such as the formation of flammable, toxic or corrosive mixtures at grade level or on elevated work structures, or ignition of relief stress at the point of emission. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsUnited Nations Dangerous Goods
Definition(s)
United Nations Dangerous Goods (UNDG)
A classification system used to evaluate the potential hazards of various materials when released, which is used by most international countries as part of the product labeling or shipping information (see Reference 19). Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsUNDG
Definition(s)
UNDG
United Nations recommendations on the transport of Dangerous Goods.1United Nations Dangerous Goods (UNDG)
A classification system used to evaluate the potential hazards of various materials when released, which is used by most international countries as part of the product labeling or shipping information (see Reference 19). Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsUK HSE
Definition(s)
UK HSE
United Kingdom Health and Safety Executive. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsTotal Recordable Incidents
Definition(s)
Total recordable incidents (TRIs)
The sum of fatalities, lost work case days, restricted work day cases and medical treatment cases. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsTRI
Definition(s)
TRI
Total recordable incidents. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsTotal recordable incidents (TRIs)
The sum of fatalities, lost work case days, restricted work day cases and medical treatment cases. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsThird Party
Definition(s)
Third Party
An individual or organisation with no business relation with the company. Source: IOGP Report No. 510, Operating Management System Framework for controlling risk and delivering high performance in the oil and gas industry, International Association of Oil & Gas Producers, June 2014. Global StandardsThird Party
A person with no business relation with the Company or contractor. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsTIH
Definition(s)
TIH
Toxic inhalation hazard. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsTier
Definition(s)
Tier
One of the four levels of the OGP framework for asset integrity KPIs as described inthis report, which is in turn based on the API/ANSI standard RP 754 (see Reference 6). Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsSecondary Containment
Definition(s)
Secondary containment
An impermeable physical barrier specifically designed to prevent release into the environment of materials that have breached primary containment. Secondary containment systems include, but are not limited to, tank dykes, curbing around process equipment, drainage collection systems into segregated oily drain systems, the outer wall of double walled tanks etc. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsSecondary containment
An impermeable physical barrier specifically designed to prevent release of materials into the environment that have already breached primary containment (i.e. an LOPC). Secondary containment systems include, but are not limited to, tank dykes, curbing around process equipment, drainage collection systems into segregated oily drain systems, the outer wall of double walled tanks, etc. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsSOL
Definition(s)
SOL
Safe operating limits. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsSIA
Definition(s)
SIA
Safety Instrumentation and Alarms. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsSS
Definition(s)
SS
Stainless Steel Source: ISO 21457:2010, Petroleum and natural gas industries — Materials selection and corrosion control for oil and gas production systems, First Edition,September 2010. Global StandardsRestricted Work Day Case
Definition(s)
Restricted work day case (RWDC)
Any work-related injury other than a fatality or lost work day case which results in a person being unfit for full performance of the regular job on any day after the occupational injury. Work performed might be: and assignment to a temporary job; part-time work at the regular job; working full-time in the regular job but not performing all the usual duties of the job. Where no meaningful restricted work is being performed, the incident should be recorded as a lost work day case (LWDC). This is a recordable incident. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsRWDC
Definition(s)
RWDC
Restricted work day case. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsRestricted work day case (RWDC)
Any work-related injury other than a fatality or lost work day case which results in a person being unfit for full performance of the regular job on any day after the occupational injury. Work performed might be: and assignment to a temporary job; part-time work at the regular job; working full-time in the regular job but not performing all the usual duties of the job. Where no meaningful restricted work is being performed, the incident should be recorded as a lost work day case (LWDC). This is a recordable incident. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsReportable
Definition(s)
Recordable
For the purpose of the tables in this section, the word “reportable” means that a test shall be performed and documentation shall be provided to the purchaser of the equipment in accordance with 4.8 or 4.9.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsRecordable
A type of event or incident, including an LOPC or an occupational injury or illness, or other outcome which has been determined to meet or exceed definitions, criteria or thresholds for inclusion and classification in data provided to OGP (or other agencies or stakeholders). The broader term ‘reportable’ is often used to indicate the wider range of KPI data collected within the company for local or corporate use, of which only part will also be recordable. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsRecordable
Definition(s)
Recordable
Test performed and the results documented. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsRecordable
A type of event or incident, including an LOPC or an occupational injury or illness, or other outcome which has been determined to meet or exceed definitions, criteria or thresholds for inclusion and classification in data provided to OGP (or other agencies or stakeholders). The broader term ‘reportable’ is often used to indicate the wider range of KPI data collected within the company for local or corporate use, of which only part will also be recordable. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsPS
Definition(s)
PS
Process safety. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsPSER
Definition(s)
Process Safety Event Rate (PSER)
The number of process safety events per 1,000,000 (1 million) work hours (production and drilling work hours only). Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsProcess Safety Event Rate
Definition(s)
Process Safety Event Rate (PSER)
The number of process safety events per 1,000,000 (1 million) work hours (production and drilling work hours only). Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsPSE
Definition(s)
Process Safety Event (PSE)
For consistency with API RP 754 definitions, an incident is referred to as a Process Safety Event (PSE). Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsProcess Safety Event (PSE)
A Loss of Primary Containment (LOPC) from a process that meets the Tier 1 or Tier 2 definitions in this guide. A PSE is a Key Performance Indicator (KPI) and is recordable For the purpose of recording a PSE: drilling facilities are considered to be part of a process when operations are ‘in-hole’; land or marine vessels (trucks and ships) are considered to be part of a process when physically connected to a production facility. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsProcess Safety Event
Definition(s)
Process Safety Event (PSE)
For consistency with API RP 754 definitions, an incident is referred to as a Process Safety Event (PSE). Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsProcess Safety Event (PSE)
A Loss of Primary Containment (LOPC) from a process that meets the Tier 1 or Tier 2 definitions in this guide. A PSE is a Key Performance Indicator (KPI) and is recordable For the purpose of recording a PSE: drilling facilities are considered to be part of a process when operations are ‘in-hole’; land or marine vessels (trucks and ships) are considered to be part of a process when physically connected to a production facility. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsProcess Safety
Definition(s)
Process safety
Process safety is a disciplined framework for managing the integrity of operating systems and processes handling hazardous substances. It is achieved by applying good design principles, engineering, and operating and maintenance practices. It deals with the prevention and control of events that have the potential to release hazardous materials and energy. Such incidents can result in toxic exposures, fires or explosions, and could ultimately result in serious incidents including facilities, injuries, property damage, lost production or environmental damage. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsProcess safety
Process safety is a disciplined framework for managing the integrity of operating systems and processes handling hazardous substances by applying good design principles, engineering, and operating and maintenance practices. It deals with the prevention and control of events with the potential to release hazardous materials and energy. Such releases can result in toxic effects, fire, explosion, and could ultimately result in serious incidents including facilities, injuries, property damage, lost production and environmental damage. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsPrimary Containment
Definition(s)
Primary containment
A tank, vessel, pipe, truck, rail car, or other equipment designed to keep a material within it, typically for purposes of storage, separation, processing or transfer of gases or liquids. The terms vessel and pipe are taken to include containment of reservoir fluids within the casing and wellhead valving to the surface. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsPrimary containment
A tank, vessel, pipe, truck, rail car, or other equipment designed to keep a material within it, typically for purposes of storage, separation, processing or transfer of gases or liquids. The terms vessel and pipe are taken to include containment of reservoir fluids within the casing and wellhead valving to the surface. Note that primary containment for a specified material may comprise a vessel or pipe that is inside another vessel that is also designed as primary containment for a different material; for example, a heating tube is primary containment for fuel gas or fuel oil, even though the tubes may be inside a firebox which is in turn within an oil-water separator. Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global StandardsPressure Relief Device
Definition(s)
Pressure-relief device
Device actuated by inlet static pressure and designed to open during emergency or abnormal conditions to prevent a rise of internal fluid pressure in excess of a specified design value.- NOTE: The device may be a pressure-relief valve, a rupture disk device, or a buckling pin device.