Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
(Normal) Towing
Definition(s)
(Normal) Towing
Drawing or pulling the unit by a chain or line using a tug boat.Normally towing is performed for units without any propulsion for (re-)location (compare with emergency towing). Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global Standards25% (50%) Drainage time
Definition(s)
25% (50%) Drainage Time
25% (50%) drainage time is the time for 25% (50%) of the liquid content of a foam to drain out. Source: IMO MSC.1/Circ.1312, Revised Guidelines for the performance and testing criteria, and surveys of foam concentrates for fixed fire-extinguishing systems, 10 June 2009, International Maritime Organization. Regulatory GuidanceT
Definition(s)
T
tare.
Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsT
Tare weight of the empty CCU, including any permanent equipment and excluding cargo and the lifting set. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsT
The weight of the empty CCU, including any permanent equipment and excluding cargo and the lifting set.
Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standardst
thickness of pad eye at hole or material thickness Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standardst
Consolidation time.
Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global StandardsT&C
Definition(s)
T&C
Threaded and coupled. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards Source: API RP 5C5, Recommended Practice on Procedures for Testing Casing and Tubing Connections, Third Edition, July 2003 (Reaffirmed August 2010). Global Standards Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global StandardsTabletop Exercise
Definition(s)
Tabletop Exercise
A discussion-based exercise where personnel meet in a classroom setting or breakout groups and are presented with a scenario to validate the content of plans, procedures, policies, cooperative agreements or other information for managing an incident. Adapted from: NCSD Glossary, DHS Homeland Security Exercise and Evaluation Program. Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global StandardsTAF
Definition(s)
TAF
An Aerodrome Forecast that is intended to be used wholly or partially for the arrival, departure, and movement or servicing of aircraft. Source: Offshore Physical Environmental Guidelines, The Canada-Newfoundland and Labrador Offshore Petroleum Board, Canada-Nova Scotia Offshore Petroleum Board, and National Energy Board, Canada, September 2008. Regulatory GuidanceTag Number
Definition(s)
Tag Number
Number that identifies the physical location of equipment. NOTE For more detailed definitions and interpretations, see Annex C. Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global StandardsTagout
Definition(s)
Tagout
The placement of a tagout device on an energy isolating device, in accordance with an established procedure, to indicate that the energy isolating device and the equipment being controlled may not be operated until the tagout device is removed. API RP 2201, Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries, Fifth Edition, July 2003 (Reaffirmed October 2010), Global StandardsTail Cement
Definition(s)
Tail Cement
“Tail cement” means the last, typically higher density slurry pumped during primary cementing operations to seal the casing seat and isolate specific intervals providing faster thickening times and higher early compressive strength. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. RegulationsTailgate Meeting
Definition(s)
Tailgate Meeting
Work team meetings held at the work site prior to the job starting to review potential hazards and discuss aspects of planned operations. NOTE Normally consists of crew members and any supervisor or technical resources required to perform the work). Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Seventh Edition, December 2014. Global StandardsTailored Trustworthy Space
Definition(s)
Tailored Trustworthy Space
A cyberspace environment that provides a user with confidence in its security, using automated mechanisms to ascertain security conditions and adjust the level of security based on the user's context and in the face of an evolving range of threats. Adapted from: National Science and Technology Council's Trustworthy Cyberspace: Strategic Plan for the Federal Cybersecurity Research and Development Program. Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global StandardsTaker
Definition(s)
Taker
"Carrier", or "transporter", or "taker" means any person moving or transporting oil or gas away from a lease or from any common source of supply. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsTally
Definition(s)
Tally (Verb)
Add up lengths of OCTG to arrive at an aggregate. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsTAM
Definition(s)
TAM
Thruster-assisted mooring. 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 StandardsTAN
Tank
Definition(s)
Tank
A receptacle (covered or uncovered) of 60 gallons (227.1 liters) or greater capacity. Unless referred to in these Orders as “stationary,” the above definition shall include such receptacle when used on tank cars, tank vehicles or skids. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. RegulationsTank
TANK shall mean a stationary vessel that is used to contain fluids, constructed of non-earthen materials (e.g. concrete, steel, plastic) that provide structural support. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsTank
A stationary device designed to contain an accumulation of hazardous waste that is constructed primarily of non-earthen materials (e. g., wood, concrete, steel, plastic) that provide structural support. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsTank
“Tank” means a receptacle for petroleum exceeding 1000 litres in capacity. Source: The Petroleum Rules, 1976, India, 1976. Regulations Source: The Petroleum Rules, 2002, India, 13th March 2002. RegulationsTank Battery
Definition(s)
Tank Battery
“Tank battery” means any combination of oil collection tanks, brine collection tanks, and associated equipment within a containment dike. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. RegulationsTank Bottoms
Definition(s)
Tank Bottoms
"Tank bottoms" means that accumulation of hydrocarbon material and other substances which settle naturally below crude oil in tanks and receptacles that are used in handling and storing of crude oil, and which accumulation contains basic sediment and water in an amount rendering it unsaleable to an ordinary crude oil purchaser; provided, that with respect to lease production and for lease storage tanks, a tank bottom shall be limited to that volume of the tank in which it is contained that lies below the bottom of the pipeline outlet thereto. Source: Oil and gas Conservation, North Dakota Administrative Code, Chapter 43-02-03, April 2012. RegulationsTank Bottoms
“Tank bottoms” means that accumulation of hydrocarbon material and other substances that settles naturally below oil in tanks and receptacles that are used in oil’s handling and storing, and which accumulation contains in excess of two percent of BS&W; provided, however, that with respect to lease production and for lease storage tanks, a tank bottom shall be limited to that volume of the tank in which it is contained that lies below the bottom of the pipeline outlet to the tank. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsTank Bottoms
"Tank bottoms" means the liquids and/or solids in that portion of a storage facility below the sales line or connection that are unsaleable to the crude oil first purchaser in its present form. Tank bottoms may consist of a combination of several elements including, but not limited to, oil, BS&W, and treating fluids. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsTank Bottoms
A mixture of crude oil or lease condensate, water, and other substances that is concentrated at the bottom of producing lease tanks and pipeline storage tanks (commonly referred to as basic sediment and water or BS&W). Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsTank Cart
Definition(s)
Tank Cart
“Tank cart” means a hand-drawn or animal-drawn vehicle equipped with a tank. Source: The Petroleum Rules, 1976, India, 1976. Regulations Source: The Petroleum Rules, 2002, India, 13th March 2002. RegulationsTank Farm Piping
Definition(s)
Tank Farm Piping
Process piping inside tank farm dikes or directly associated with a tank farm.
Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global StandardsTank Forming Part of a Tank Vehicle
Definition(s)
Tank Forming Part of a Tank Vehicle
In this part, “the tank forming part of a tank vehicle” shall be deemed to include any number of tanks on the same chassis and any limitation herein specified the capacity of a tank shall be construed so as to permit of the tank containing the quantity specified under varying degrees of temperature. Source: The Petroleum Rules, 1976, India, 1976. Regulations Source: The Petroleum Rules, 2002, India, 13th March 2002. RegulationsTank Semi-trailer
Definition(s)
Tank Semi-trailer
“Tank semi-trailer” means a tank trailer constructed in such a manner that when it is drawn by a tractor by means of fifth wheel connection, some part of the load rests on the towing vehicle. Source: The Petroleum Rules, 1976, India, 1976. Regulations Source: The Petroleum Rules, 2002, India, 13th March 2002. RegulationsTank Station
Definition(s)
Tank station
Tank station means:- a greenhouse gas tank station; or
- a petroleum tank station.