Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Box
Definition(s)
Box
Female member of a riser coupling or an external line stab assembly.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsBox
Internally-threaded end of integral-joint OCTG, or the coupling end of threaded-and coupled OCTG. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsBox
The female member of a riser coupling, C&K line stab assembly or auxiliary line stab assembly. 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 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 StandardsBorescope
Definition(s)
Borescope
Optical instrument with an illuminating lamp, used for inspecting the inside surface of OCTG. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsBlack Light
Definition(s)
Black Light
Long-wave ultraviolet light (UV-A) with a wavelength between 320 nm and 400 nm. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsBlack-Crested Thread
Definition(s)
Black-Crested Thread
Non-full-crested thread whose original (black) mill surface has not been completely removed. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsBlack-Crested Thread
Non-full-crested threads have historically been, and continue to be, referred to as black crested threads because the original mill surface has not been removed. The term black crested thread is a useful descriptive term, however, it should be understood that there can also be non-full-crested threads that are not black. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsBack-Wall Reflection
Definition(s)
Back-Wall Reflection
Ultrasonic signal received from the back surface of the pipe wall. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsTEG
Definition(s)
TEG
Triethylene glycol. Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards Equipment, systems, and methods which, following initiation, can be used to control, mitigate, and extinguish fires. 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 StandardsArc
Definition(s)
Arc (verb)
Create intense heat and light by passing an electric current across a gap. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsAmpere-Turn
Definition(s)
Ampere-Turn
Unit of magnetomotive force which is the product of the number of turns in a coil and the quantity of amperes of current flowing through it, representing the magnetizing strength of the coil. EXAMPLE 800 A in a 6-turn coil gives 4 800 ampere-turns. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsAgency
Definition(s)
Agency
Agency means— (a) a government department: (b) a Crown entity within the meaning of section 2(1) of the Public Finance Act 1989: (c) the New Zealand Police: (d) the New Zealand Defence Force Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationAgency
Entity contracted to inspect new OCTG using the methods and criteria specified. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsAgency
Entity contracted to inspect used drill stem elements using the methods and criteria specified. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global StandardsAgency
“Agency” means the Canadian Environmental Assessment Agency established by section 61; Agence. Source: Canadian Environmental Assessment Act, 1992, c. 37, Canada, as consolidated November 2003. LegislationAC-Field
Definition(s)
AC-Field
Magnetic field induced by alternating current. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsA-Scan
Definition(s)
A-Scan
Data presentation utilizing a horizontal base line that indicates distance, or time, and a vertical deflection from the base line that indicates amplitude. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsA-Scan
Ultrasonic instrument display where distance is represented on the horizontal axis and signal strength on the vertical axis. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global StandardsAction
Definition(s)
Action
External load applied to the structure (direct action) or an imposed deformation or acceleration (indirect action). EXAMPLE An imposed deformation can be caused by fabrication tolerances, settlement, temperature change or moisture variation. NOTE An earthquake typically generates imposed accelerations. [ISO 19900:2002, 2.1] Source: API RP 2MOP, Marine Operations, Upstream Segment, First Edition, July 2010. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global StandardsAction
External load applied to the structure (direct action) or an imposed deformation or acceleration (indirect action). EXAMPLE An imposed deformation can be caused by fabrication tolerances, settlement, temperature change or moisture variation. NOTE An earthquake typically generates imposed accelerations. [ISO 19900:2002] 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 StandardsAction
External load applied to the structure (direct action) or an imposed deformation or acceleration (indirect action). EXAMPLE An imposed deformation can be caused by fabrication tolerances, settlement, temperature change or moisture variation. NOTE An earthquake typically generates imposed accelerations. [ISO 19900:2002, definition 2.1]. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global StandardsRM
Definition(s)
Rm
Specified minimum tensile strength at room temperature. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsRM
Reliability and maintenance. Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global StandardsRm
Ultimate tensile strength. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global StandardsRCM
Definition(s)
RCM
Reliability-centred maintenance. Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global Standards Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 1, Regulations, June 2013, Lloyd’s Register, Global StandardsRCM
Reliability cantered maintenance. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global StandardsRAM(S)
Definition(s)
RAM(S)
Reliability, availability, maintainability (and safety). Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global StandardsRA
Definition(s)
Ra
Surface finish Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsRa
Measurement of the average roughness of a surface. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsRA
Component of a JSA, where a determination of the expected level (severity) of illness, injury, and/or property damage that an identified hazard can cause is coupled with the frequency (probability) of that level of hazard occurring.- NOTE: 1 This is then plotted on a matrix to determine the level of risk associated with that job.
- NOTE: 2 If the level of risk is not acceptable, control measures are introduced to reduce the risk to an acceptable level.