Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
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Definition(s)
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Greater than. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsFt-Lbs
Definition(s)
Ft-Lbs
Foot pounds. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsFt3
Definition(s)
Ft3
Cubic feet. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsFt2
Definition(s)
Ft2
Square feet. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsFT
Definition(s)
FT
Fracture Toughness. Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global StandardsFt
Feet. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsF
Definition(s)
F
Shackle flange width.
Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsF
Applied force. Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards°F
Temperature degrees in Fahrenheit. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards°C
Definition(s)
°C
Temperature degrees in Centigrade. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsOS
Definition(s)
OS
Operating system. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsOS
DNV GL Offshore standard. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global StandardOS
DNV Offshore Standard. Source: Verification of Lifting Appliances for the Oil and Gas Industry, DNV-OSS-308, October 2010, Det Norske Veritas AS, Global StandardsASNT
Definition(s)
ASNT
American Society for Nondestructive Testing. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global StandardsANS
Definition(s)
ANS
American National Standards Institute. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsWeld Joint
Definition(s)
Weld Joint
Fitting together of components in order to facilitate their joining by welding. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsWeld Joint
A description of the way components are fitted together in order to facilitate joining by welding. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global StandardsWeld Groove
Definition(s)
Weld Groove
Area between two metals to be joined that has been prepared to receive weld filler metal. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsWeld Groove
An area between two metals to be joined that has been prepared to receive weld filler metal. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global StandardsWeld Groove (weld prep)
Area between two metals to be joined that has been prepared to receive weld filler metal; also known as “weld prep” Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsVolumetric Non-Destructive Examination
Definition(s)
Volumetric Non-Destructive Examination
Examination for internal material defects by radiography, acoustic emission or ultrasonic testing. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsVariable-Bore Ram (VBR)
Definition(s)
Variable-Bore Ram
Closing and sealing component in a ram BOP that is capable of sealing on a range of tubular sizes.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsVariable-Bore Ram (VBR)
Closing and sealing component in a ram blowout preventer that is capable of sealing on a range of tubular sizes. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsTrepan, Verb
Definition(s)
Trepan, Verb
Produce a hole through a part by boring a narrow band or groove around the circumference of the hole and removing the solid central core of material. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsSurface Finish (Ra)
Definition(s)
Surface Finish (Ra)
Measurement of the average roughness of a surface. NOTE 1 It is expressed in micrometres (μm). NOTE 2 All of the surface finishes given in this American National Standard are to be considered maxima. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsStandard Connection
Definition(s)
Standard Connection
Flange, hub or studded connection manufactured in accordance with an ISO standard, including dimensional requirements. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsStabilized 〈Temperature Testing〉
Definition(s)
Stabilized 〈Temperature Testing〉
In a state in which the initial temperature fluctuations have decreased to within the manufacturer's specified range. NOTE Temperature fluctuation can be caused by such things as mixing of different-temperature fluids, convection or conduction. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsStabilized 〈Pressure Testing〉
Definition(s)
Stabilized 〈Pressure Testing〉
In a state in which the initial pressure-decline rate has decreased to within the manufacturer's specified rate. NOTE Pressure decline can be caused by such things as changes in temperature, setting of elastomer seals or compression of air trapped in the equipment being tested. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsRounded Indication 〈Liquid Penetrant or Magnetic Particle Examination〉
Definition(s)
Rounded Indication 〈Liquid Penetrant or Magnetic Particle Examination〉
Any indication that is approximately circular or elliptical and whose length is less than three times its width. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsProduct Family
Definition(s)
Product Family
Model or type of specific equipment listed in Section 1 of this specification. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsProduct Family
Model or type of specific equipment listed in clause 1 of this American National Standard. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsProduct Family
A model or type of specific equipment listed in 1.2.1. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global StandardsPressure-Retaining Part or Pressure-Retaining Member
Definition(s)
Pressure-Retaining Part or Pressure-Retaining Member
Part not exposed to wellbore fluids whose failure to function as intended will result in a release of wellbore fluid to the environment. EXAMPLES Closure bolts and clamps. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsPressure End Load
Definition(s)
Pressure End Load
Axial load resulting from internal pressure applied to the area defined by the maximum seal diameter. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsPressure End Load
The axial load resulting from internal pressure applied to the area defined by the maximum seal diameter. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global StandardsPressure-Controlling Part or Pressure-Controlling Member
Definition(s)
Pressure-Controlling Part or Pressure-Controlling Member
Part intended to control or regulate the movement of wellbore fluids. EXAMPLES Packing elements, rams, replaceable seats within a pressure-containing member or part. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsPressure-Containing Part or Pressure-Containing Member
Definition(s)
Pressure-Containing Part or Pressure-Containing Member
Part exposed to wellbore fluids whose failure to function as intended would result in a release of wellbore fluid to the environment. EXAMPLES Bodies, bonnets and connecting rods. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsPost-Weld Heat Treatment (PWHT)
Definition(s)
Postweld Heat Treatment
A work process which consists of heating an entire weldment or section of fabricated piping to an elevated temperature after completion of welding in order to relieve the detrimental effects of welding heat, such as reducing residual stresses, reducing hardness, and/or slightly modifying properties (See ASME B31.3, paragraph 331). 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 StandardsPostweld Heat Treatment
Treatment that consists of heating an entire weldment or vessel to a specified elevated temperature after completion of welding in order to relieve the detrimental effects of welding heat, such as to reduce residual stresses, reduce hardness, stabilize chemistry and/or slightly modify properties.
Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global StandardsPost-Weld Heat Treatment (PWHT)
Any heat treatment subsequent to welding, including stress relief. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsOther End Connection (OEC)
Definition(s)
Other End Connection
Connection that is not specified in an API specification or standard.- NOTE: This includes API flanges and hubs with non-API gasket preparations and manufacturer's proprietary connections.
Other End Connection (OEC)
Connection which is not specified in an ISO standard. NOTE This includes ISO flanges and hubs with non-ISO gasket preparations and manufacturer's proprietary connections. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsMajor Repair Weld
Definition(s)
Major Repair Weld
Weld whose depth that is greater than 25 % of the original wall thickness or 25.4 mm (1 in.), whichever is less.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsMajor Repair Weld
Weld whose depth is greater than 25 % of the original wall thickness or 25 mm, whichever is less. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsLoose Connection
Definition(s)
Loose Connection
Flange (studded or open-face), hub connection, or OEC used to join together equipment, but not integral to the equipment.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards