Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Characteristic Resistance
Definition(s)
Characteristic resistance
The reference value of structural strength to be used in the determination of the design strength. The characteristic resistance is normally based upon a 5% fractile in the lower end of the distribution function for resistance. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsDynamic Tension Limit
Definition(s)
Dynamic Tension Limit
Maximum allowable pressure multiplied by the effective hydraulic area, divided by the number of line parts. 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 StandardsCharacteristic Load
Definition(s)
Characteristic load
The reference value of a load to be used in the determination of load effects. The characteristic load is normally based upon a defined fractile in the upper end of the distribution function for load. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsDynamic Positioning
Definition(s)
Dynamic Positioning
Automatic stationkeeping. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsDynamic Positioning
Computerized means of maintaining a vessel on location by selectively activating thrusters. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsDynamic Positioning
Stationkeeping technique consisting primarily of a system of automatically controlled on-board thrusters, which generate appropriate thrust vectors to counter the mean and slowly varying induced actions. 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 StandardsDynamic Positioning
Dynamic Positioning System means a system whereby a self-propelled MOU's position and heading is automatically controlled by using its own propulsion units. Source: IMO Resolution A.1079(28), Recommendations for the Training and Certification of Personnel on Mobile Offshore Units (MOUs), Adopted on 4 December 2013, International Maritime Organization, Regulatory GuidanceDynamic Positioning
Computerized means of maintaining a vessel on location by selectively driving thrusters. 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 StandardsDynamic Positioning
“Dynamic positioning system ” means a system where power supply, thruster system and control system are assembled and can be operated to maintain the fixed position automatically. Source: Petroleum and Natural Gas (Safety in Offshore Operations) Rules, 2008, India, 18th June 2008. RegulationsDynamic Positioning (automatic station keeping)
A computerized means of maintaining a vessel on location by selectively driving thrusters. 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 StandardsCathodic Protection
Definition(s)
Cathodic protection
A technique to prevent corrosion of a steel surface by making the surface to be the cathode of an electrochemical cell. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsCathodic protection
Type of protection that prevents external corrosion; it consists of setting up a current around the line or vessel to reverse the flow of electrons and thus inhibit corrosion. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsDTL
Definition(s)
DTL
Dynamic tension limit. 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 StandardsAverage
Definition(s)
Average
Average during one day and night. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsAtmospheric zone
Definition(s)
Atmospheric zone
The external surfaces of the unit above the splash zone. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsAtmospheric zone
That part of the external structure above the splash zone. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 8, Corrosion Controls, June 2013, Lloyd’s Register, Global StandardsC&K Line
Definition(s)
C&K Line
External conduit arranged laterally along the riser pipe and used for circulation of fluids into and out of the wellbore to control well pressure. 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 StandardsSCE
Definition(s)
SCE
Part of a facility, including computer programs, whose purpose is to prevent or limit the consequences of a major accident, or whose failure could cause or contribute substantially to a major accident Note 1 to entry: Safety critical elements include measures for prevention, detection, control and mitigation (including personnel protection) of hazards. [SOURCE: EU Directive 2013/30/EU, modified]. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global StandardsSCE
Saturated calomel electrode. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsSCE
Safety-critical element. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API RP 2FB, Recommended Practice for the Design of Offshore Facilities Against Fire and Blast Loading, First Edition, April 2006. Global Standards Source: Prevention of Fire and Explosion, and Emergency Response on Offshore Installations, Offshore Installations (Prevention of Fire and Explosion, and Emergency Response) Regulations 1995, Approved Code of Practice and guidance (UK HSE L65), Second Edition, 1997. Regulatory Guidance Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global StandardsSCE
Safety Critical Element. Source: NOGEPA Industrial Guideline No. 43, Surface BOP Review, Best Practices Checklist, Netherlands, Version 0, December 2011. Global StandardsRHS
Definition(s)
RHS
Rectangular hollow section. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsAutomatic Stationkeeping
Definition(s)
Automatic Stationkeeping
Computerized means of maintaining a vessel on location by selectively driving thrusters. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. 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 StandardsBumper
Definition(s)
Bumper
Temporary structure designed to protect structures or modules during the initial fitting stage of an installation operation. Source: API RP 2MOP, Marine Operations, Upstream Segment, First Edition, July 2010. Global Standards
Bridging Document
Definition(s)
Bridging Document
Document that aligns and co-ordinates the requirements and responses of various parties in relation to a specific aspect of a project. NOTE Commonly used to align and co-ordinate the emergency response procedures for owner and contractors. Source: API RP 2MOP, Marine Operations, Upstream Segment, First Edition, July 2010. Global Standards
Bollard Pull
Definition(s)
Bollard Pull
Towing or manoeuvring action that can be generated by a tug for an indefinite period of time with its propulsion system running at operational, as opposed to maximum revolutions per minute. NOTE Bollard pull is expressed in kilonewtons. Source: API RP 2MOP, Marine Operations, Upstream Segment, First Edition, July 2010. Global Standards
AISC
Definition(s)
AISC
American Institute of Steel Construction. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards Source: API RP 2FB, Recommended Practice for the Design of Offshore Facilities Against Fire and Blast Loading, First Edition, April 2006. Global StandardsAccidental Limit States
Definition(s)
Accidental Limit States (ALS)
Ensures that the structure resists accidental loads and maintain integrity and performance of the structure due to local damage or flooding. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsRecovery
Definition(s)
Recovery
The activities after an incident or event to restore essential services and operations in the short and medium term and fully restore all capabilities in the longer term. Adapted from: NIPP. Extended Definition: In cybersecurity, response encompasses both automated and manual activities. Adapted from: National Infrastructure Protection Plan, NCPS Target Architecture Glossary. Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global StandardsRecovery
The ability of a site to withstand and execute service and site restoration plans for affected assets and the reconstitution of operations and services through individual, private sector, nongovernmental, and public assistance programs that identify needs and define resources; provide housing and promote restoration; address long-term care and treatment of affected persons; implement additional measures for community restoration; incorporate mitigation measures and techniques, as feasible; evaluate the incident to identify lessons learned; and develop initiatives to mitigate the effects of future incidents.
Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global Standards
Source:API STANDARD 780, Security Risk Assessment Methodology for the Petroleum and Petrochemical Industries, First Edition, May 2013. Global Standards