Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
HSE Critical System / Equipment
Definition(s)
HSE Critical System / Equipment
Any part of an installation (system, equipment, software, etc.) which:- has the purpose of preventing the release, or limiting the effect of, a major hazard, or which
- could cause, or substantially contribute to, the release of a major hazard if it failed.
HSE Critical Activity
Definition(s)
HSE Critical Activity
Activity or task which provides or maintains Barriers. (These tasks may or may not be hazardous in themselves, e.g., monitoring alarms, gas detector testing, Permit-To-Work.) Other Related Terms and Definitions: IADC HSE Case Guidelines Issue 02 – Activity or task which exposes the person(s) carrying out the task to hazards [interpretation from context]. 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 GuidelinesHazardous Situation
Definition(s)
Hazardous Situation
Circumstances in which people, property or the environment are exposed to one or more hazards. Other Related Terms and Definitions: ISO Guide 73 – Circumstances in which people, property or the environment are exposed to one or more hazards. 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: ISO/IEC Guide 51:1999, Safety aspects – Guidelines for their inclusion in standards, Global StandardsHazardous Operation
Definition(s)
Hazardous Operation
See also Operation. Operation with the potential to release one or more Major Hazards or defeat Barriers for one or more Major Hazards. 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 GuidelinesHazardous Activity
Definition(s)
Hazardous Activity
Activity or task which exposes the person(s) carrying out the task to a hazard. E.g., working at height, welding, etc. 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 GuidelinesHazard Hierarchy
Definition(s)
Hazard Hierarchy
A checklist of hazards, consequences and sources which may be used, as appropriate, for risk assessment (risk identification and assessment). Before using the checklist is should be reviewed to confirm that is appropriate and complete for the intended application. 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 GuidelinesHarm
Definition(s)
Harm
Injury or damage to the health of people, or damage to property or the environment. [SOURCE: ISO/IEC Guide 51:2014, 3.1] 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 StandardsHarm
Physical injury or damage to the health of people, or damage to property or the environment. Other Related Terms and Definitions: ISO Guide 73 – physical injury or damage to the health of people, or damage to property or the environment. Source: ISO/IEC Guide 51:1999, Safety aspects – Guidelines for their inclusion in standards, Global Standards IADC HSE Case Guidelines Issue 02 – The damage, injury or ill-health, whether physical or mental, inflicted upon animate or inanimate objects. 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 GuidelinesHarm
Harm— (a) means illness, injury, or both; and (b) includes physical or mental harm caused by work-related stress. Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationHarm
physical injury or damage to health Source: Rules for Classification and Construction, IV Industrial Services, 6 Offshore Technology, 9 Guideline for Personnel Transfers by Means of Lifting Appliances, Edition 2011, Germanischer Lloyd SE, Global StandardsGeneral Workplace Practices
Definition(s)
General Workplace Practices
Routine practices that are common to many industries and businesses, e.g., operations in construction and maintenance. Local regulations or industry standards often exist for the practice or elements of the practice. 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 GuidelinesFunctionality
Definition(s)
Functionality
Operational requirements of the system/structure/equipment in order to establish and maintain integrity. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global StandardsFunctionality
The ability of a system to perform its specified role. This may be characterized and demonstrated by identifying critical functional parameters. 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 GuidelinesFunctionality
What a device or system is designed to do. Source: OGP Report No. 415, Asset integrity – the key to managing major incident risks, International Association of Oil & Gas Producers, December 2008. Global StandardsFAR
Definition(s)
Fatal Accident Rate (FAR)
The number of calculated fatalities that will occur for every 100 million man-hours worked. 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 GuidelinesFatal Accident Rate
Definition(s)
Fatal Accident Rate (FAR)
The number of calculated fatalities that will occur for every 100 million man-hours worked. 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 GuidelinesEnvironmental Significance
Definition(s)
Environmental Significance
A threshold criteria for judging the significance of an environmental aspect. 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 GuidelinesEnvironmental Aspect
Definition(s)
Environmental Aspect
Environmental aspect An element of an operator’s activities, products or services that can interact with the environment. Note: CSA Standard CAN/CSA-ISO 14004:04. Source: Environmental Protection Plan Guidelines, The Canada-Newfoundland and Labrador Offshore Petroleum Board, Canada-Nova Scotia Offshore Petroleum Board, and National Energy Board, Canada, March 31, 2011. Regulatory GuidanceEnvironmental Aspect
Element of an organization’s activities, products or services that can interact with the environment. Other Related Terms and Definitions: ISO-17776 – Element of an organization’s activities, products or services that can interact with the environment. [ISO 14001] IADC HSE Case Guidelines Issue 02 – Element of an organization’s activities or services that can interact with the environment. 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 GuidelinesElectrical Isolation
Definition(s)
Electrical Isolation
Electrical isolation is the secure, proven disconnection and separation of a circuit or item of equipment from every source of electrical energy. 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 GuidelinesDiversity
Definition(s)
Diversity
The ability to perform the same function through a number of different and independent means. 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 GuidelinesDefence
Definition(s)
Defence
See also Barrier. Barrier which reduces the consequences of the release of a hazard by limiting the chain of events arising from the Top Event. Other Related Terms and Definitions: IADC HSE Case Guidelines Issue 02 – (Control) - Means of intervention permitted by the design (e.g. pressure relief valves, emergency power supplies), hardware (e.g. dump tanks, coolant sprays), or the presence of manually or automatically initiated ESD procedures which are intended to contain a developing situation so that escalation to a major accident may be avoided. 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 GuidelinesDefeating Factor Barrier
Definition(s)
Defeating Factor Barrier
Measure put in place to prevent or mitigate the effects of a Defeating Factor. 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 GuidelinesDefeating Factor
Definition(s)
Defeating Factor
Condition that defeats a barrier, leading to increased risk. 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 GuidelinesCost Benefit Analysis
Definition(s)
Cost Benefit Analysis (CBA)
An analysis which evaluates the costs to be made versus the benefits obtained to reduce risk associated with an activity. 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 GuidelinesClass Rules
Definition(s)
Class Rules
Rules set by the Classification Societies and intended to ensure safety of lives, the protection of assets and the marine environment. 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 GuidelinesCause
Definition(s)
Cause
Anything with the potential to release a hazard. Cause classes include (but are not limited to): thermal energy, chemical energy, biological energy, radiation, kinetic energy, electrical energy, climatic condition, uncertainty or human factors. 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 GuidelinesAuditing
Definition(s)
Auditing
A structured independent assessment of the efficiency, effectiveness, and reliability of the management system. 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 GuidelinesWOAD
Definition(s)
WOAD
World Offshore Accident Database. 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 GuidelinesTRA
Definition(s)
TRA
Threat and risk assessment. Source: DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global StandardsTRA
Task Risk Assessment. 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 GuidelinesSSoM
Definition(s)
SSoM
State Supervision of Mines, Netherlands. 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 GuidelinesSOOB
Definition(s)
SOOB
Summary of Operation Boundaries. 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 GuidelinesSummary of Operation Boundaries (SOOB)
A summary of defeating factors (either single or in combination) that have the potential to exceed the tolerability limits of safe operations. These defeating factors are qualitatively determined using experience and establish the boundaries in which operations are carried out. Other Related Terms and Definitions: Shell EP95-0010 (Revision 1 – 25 Jan 2001) – (Manual of Permitted Operations – MOPO) – Manual of Permitted Operations defines the limits of safe operation when barrier effectiveness is reduced. The limit of safe operation permitted during periods of escalated risk in either likelihood or consequence. The limit of safe operations if the barriers are reduced, removed, or purposely defeated. 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 GuidelinesSHIDAC
Definition(s)
SHIDAC
Structured Hazard Identification, Assessment & Control. 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 GuidelinesSHIDAC
Structured Hazard Identification, Assessment and Control (SHIDAC) Process incorporating the basics of fault-tree and event-tree, implementing measures to control hazards and to recover in case of barrier failure. A key deliverable is the identification or determination of Critical Activities or Tasks that ensure the identified Barriers are established, maintained and effective. The steps are:- Identify the hazards
- Assess the potential consequences, their likelihoods and their associated risks
- Identify hazard Control Barriers to prevent release, and
- Identify Defence Barriers to protect people, assets, environment and reputation in the event of such a hazard release.