Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Flex/Ball Joint
Definition(s)
Flex/Ball Joint
Device(s) installed between the bottom of the diverter and LMRP joint, to permit relative angular movement of the riser, to reduce stresses due to vessel motion and environmental forces. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsFlex/Ball Joint
A device installed directly above the subsea BOP stack and at the top of the telescopic riser joint to permit relative angular movement of the riser to reduce stresses due to vessel motions and environmental forces. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsFill-up Line
Definition(s)
Fill-up Line
Line usually connected to the diverter housing, or bell nipple, above the BOPs to facilitate adding drilling fluid to the riser main tube, at atmospheric pressure.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsFill-up Line
A line usually connected into the diverter housing, or bell nipple, above the BOPs to facilitate adding drilling fluid to the hole, at atmospheric pressure. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsFill-up Line
The line through which fluid is added to the riser annulus. 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 StandardsFill-up Line
A line usually connected into the bell nipple above the BOP to allow adding drilling fluid to the hole while pulling out of the hole to compensate for the metal volume displacement of the drill string being pulled. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsEquipment User
Definition(s)
Equipment User
The company that owns the well, wellhead, or wellhead assemblies on which the equipment is to be installed. NOTE: This entity may also be the equipment owner in cases where the equipment is rented from a third party supplier, in part or wholly, depending on the level of equipment supplied. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsEquipment Owner
Definition(s)
Equipment Owner
The purchaser or renter of the equipment to be installed on the wellhead. NOTE: In most cases this is the drilling contractor. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsEquipment Owner
Owner of the equipment repaired or remanufactured in conformance with this document.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsEDS
Definition(s)
EDS
Emergency disconnect sequence. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: Deepwater Well Control Guidelines. IADC Guidelines Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global StandardsEDS
Emergency Disconnect System. Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global StandardsEDS
Emergency disconnect sequenced systems. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsDrill String Float
Definition(s)
Drill String Float
A check valve in the drill string that will allow fluid to be pumped in to the well but will prevent wellbore fluids from entering the drill pipe. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsDrill String Float
A check valve in the drill string that will allow fluid to be pumped into the well but will prevent flow from the well through the drill pipe. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsDrilling Spool
Definition(s)
Drilling Spool
Pressure-containing piece of equipment having end connections with or without side outlet connections, used below or between drill-through equipment.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsDrilling Spool
Pressure-containing piece of equipment having end connections and outlets, used below or between drill-through equipment. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsDrilling Spool
A flanged joint placed between the BOP and casing-head or between BOPs that serve as a spacer or crossover. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsDrilling Spool
A flanged joint placed between the BOP and casing-head that serves as a spacer or crossover. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsDrilling Spool
Pressure-containing piece of equipment having end connections, used below or between drill-through equipment. NOTE When outlet connections are provided, they shall be manufactured in accordance with this American National Standard. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsDrilling Spool
BOP stack connection, with flanged ends, used as a spacer between bop equipment, may or may not have side outlets for connection to auxiliary lines. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsDrill Pipe Safety Valve
Definition(s)
Drill Pipe Safety Valve
An essentially full-opening valve located on the rig floor with threads to match the drill pipe connections or other tubulars in use. NOTE: This valve is used to close off the drill pipe to prevent flow and may be crossed over to fit other connections and sizes of tubulars being installed in the well. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsDrill Pipe Safety Valve
An essentially full-opening valve located on the rig floor with threads to match the drill pipe in use. This valve is used to close off the drill pipe to prevent flow. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsDrill Pipe Safety Valve
An essentially full-opening valve located on the rig floor with threads to match the drill pipe in use. This valve is used to close off the drill pipe to prevent flow. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsCSR
Definition(s)
CSR
Casing shear ram. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global StandardsCSR
Offshore Installations (Construction and Survey) Regulations 1974. 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 GuidanceControl Manifold
Definition(s)
Control Manifold
The system of valves and piping to control the flow of hydraulic fluid to operate the various components of the BOP stack. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsControl Manifold
The assemblage of valves, regulators, gauges and piping used to regulate pressures and control the flow of hydraulic power fluid to operate system functions. Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global StandardsCompetent Person
Definition(s)
Competent Person
A person with characteristics or abilities gained through training, experience, or both, as measured against the manufacturers’ or equipment owner’s established requirements. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsCompetent Person
A person identified by the employer as being capable of identifying existing and predictable hazards in the surroundings or working conditions which are unsanitary, hazardous, or dangerous to personnel, and who has authorization to take prompt corrective measures to eliminate them (OSHA 1926.32). The concept of “competent person” is performance-based relative to the context of the work to be done. API RP 2201, Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries, Fifth Edition, July 2003 (Reaffirmed October 2010), Global Standards API RP 2009, Safe Welding, Cutting, and Hot Work Practices in the Petroleum and Petrochemical Industries, Seventh Edition, February 2002 (Reaffirmed, March 2012), Global StandardsCompetent Person
A competent person [defined in Rule-2(g)] is a person, with appropriate knowledge (theoretical and practical) and experience of operations (including equipment and process). He can carry out thorough examination of operations, which will enable him to detect defects & weaknesses and assess their importance to safety and operations. Source: Guidance Notes on Petroleum and Natural Gas (Safety in Offshore Operations) Rules, 2008, Oil Industry Safety Directorate (India), 2012. Regulatory GuidanceCompetent Person
Competent person means a person with sufficient theoretical knowledge and practical experience to make an informed assessment of the likelihood of a dangerous atmosphere being present or subsequently arising in the space. .Source: IMO resolution A.1050(27), Revised recommendations for entering enclosed spaces aboard ships, 21 December 2011, International Maritime Organization. Regulatory GuidanceCompetent Person
"Competent Person" means one who is capable of identifying existing and predictable hazards in the surrounding or working conditions which are unsanitary, hazardous, or dangerous to employees and who has authorization to take prompt corrective measures to eliminate them or who can recommend directly to persons in authority that such corrective measures be taken. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. RegulationsCompetent Person
As defined in the EC Directives for Supply of Machinery. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsCompetent Person
A person possessing adequate qualifications such as suitable training and sufficient knowledge, experience and skill for the safe performance of the specific work to a specific standard. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsCompetent Person
Competent person means a person who has the knowledge, experience, skill, and qualifications to carry out a task required by these regulations. Source: Health and Safety in Employment (Petroleum Exploration and Extraction) Regulations 2013, SR 2013/208, New Zealand, as of May 2013. RegulationsCompetent Person
Competent person means any person who has— (a) the relevant knowledge, experience, and skill to carry out a task required or permitted by these regulations to be carried out by a competent person; and (b) either— (i) a relevant qualification evidencing the person’s possession of that knowledge, experience, and skill; or (ii) if the person is an employee, a certificate issued by the person’s employer evidencing the person’s possession of that knowledge, experience, and skill. Source: Health and Safety in Employment (Mining—Underground) Regulations 1999, SR 1999/331, New Zealand, as of 8 October 1999. RegulationsCompetent Person
“Competent person” means a person recognized by the Chief Controller to be a competent person, or a person who holds a certificate of competency for the job in respect of which competency is required from an institution recognized by the Chief Controller in this behalf. Source: The Petroleum Rules, 1976, India, 1976. Regulations Source: The Petroleum Rules, 2002, India, 13th March 2002. RegulationsCompetent Person
“Competent person” means a person who is capable of identifying existing and predictable hazards associated with his area of activities and who has authorization to take prompt corrective measures to eliminate them. Source: Petroleum and Natural Gas (Safety in Offshore Operations) Rules, 2008, India, 18th June 2008. RegulationsCompetent Person
Person, organisation or unit who has sufficient theoretical knowledge and practical experience to examine and judge the technical safety of lifting appliances, in order to issue reports and certificates. Guidance note: The term Competent Person corresponds to the term Enterprice of Competence (EOC) used by The Offshore Mechanical Handling Committee (OMHEC). In some countries the Authorities require that the Competent person shall be certified, authorised or accredited. Source: Verification of Lifting Appliances for the Oil and Gas Industry, DNV-OSS-308, October 2010, Det Norske Veritas AS, Global StandardsClosing Ratio
Definition(s)
Closing Ratio
Area of the operator piston exposed to the close operating pressure, divided by the cross-sectional area of the piston shaft exposed to wellbore pressure. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsClosing Ratio (CR)
The area of the operating piston exposed to the close operating pressure, divided by the cross sectional area of the piston shaft exposed to well bore pressure. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsClamp Connection
Definition(s)
Clamp Connection
A pressure-sealing device used to join two items without using conventional bolted flange joints. NOTE The two items to be sealed are prepared with clamp hubs. These hubs are held together by a clamp containing four bolts. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsChoke
Definition(s)
Choke
A device with either a fixed or variable aperture used to control the rate of flow of liquids and/or gas. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsChoke
Equipment used to restrict and control the flow of fluids. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsChoke
Equipment used to restrict and control the flow of fluids and gas. Source: API SPEC 17D, Design and Operation of Subsea Production Systems—Subsea Wellhead and Tree Equipment, Upstream Segment, Second Edition May 2011 (Errata September 2011). Global StandardsChoke
A device with a fixed (positive) or variable (adjustable) orifice installed in a line to restrict the flow and control the rate of production from the well. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsCasing Shear Ram
Definition(s)
Casing Shear Ram (CSR)
A closing component in a ram blowout preventer that is capable of shearing or cutting certain tubulars. NOTE: Casing shear rams are not required to seal. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsBuffer Tank
Definition(s)
Buffer Tank
A targeted, horizontal, cylindrical tank that changes the direction of fluid flow downstream of the choke and serves to direct flow to the flare line or gas buster. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsBSR
Definition(s)
BSR
Bending-strength ratio. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global StandardsBSR
Blind shear ram. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global StandardsBSR
Bending strength ratio. Source: API SPEC 7-1, Specification for Rotary Drill Stem Elements, First Edition, March 2006 (Addendum April 2011). Global StandardsBlowout Preventer Stack
Definition(s)
Blowout Preventer Stack
Complete assembly of well control equipment, including preventers, spools, valves, and nipples connected to the top of the wellhead or wellhead assemblies, consisting of the lower marine riser package (LMRP) and lower stack.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsBlowout Preventer Stack
Complete assembly of well control equipment, including preventers, spools, valves, and nipples, connected to the top of the wellhead or wellhead assemblies. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsBlowout Preventer Stack
The assembly of well control equipment including preventers, spools, valves and nipples connected to the top of the wellhead. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsBlowout Preventer (BOP) Stack
The assembly of well control equipment including preventers, spools, valves, and nipples connected to the top of the casing-head that allows the well to be sealed to confine well fluids to the wellbore. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsBlowout Preventer Stack
The complete assembly of well control equipment, including preventers, spools, valves, and nipples connected to the top of the wellhead or wellhead assemblies. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsBlowout Preventer Stack
"Blowout preventer stack" means the assembly of well control equipment including preventers, spools, valves, and nipples connected to the top of the casinghead carrier. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsBlowout Preventer Control System (Closing Unit)
Definition(s)
Blowout Preventer Operating and Control System (Closing Unit)
The assembly of pumps, valves, lines, accumulators, and other items necessary to open and close the blowout preventer equipment. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsBlowout Preventer Control System (Closing Unit)
The assembly of pumps, valves, lines, accumulators, and other items necessary to open and close the blowout preventer equipment. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsBlind Shear Ram
Definition(s)
Blind Shear Ram
Closing and sealing component in a ram BOP that first shears the tubular in the wellbore and then seals the bore or acts as a blind ram if there is no tubular in the wellbore.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsBlind Shear Ram (BSR)
A closing and sealing component in a ram blowout preventer that first shears certain tubulars in the wellbore and then seals off the bore or acts as a blind ram if there is no tubular in the wellbore. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsBlind Shear Ram (BSR)
A closing and sealing component in a ram blowout preventer that first shears certain tubulars in the wellbore and then seals the bore, or acts as a blind ram if there is no tubular in the wellbore. NOTE Other common names for this ram include shearing, blind shear, or blind/shear rams. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global StandardsBlind/Shear Rams
Blind rams with a built-in cutting edge that will shear tubulars that may be in the hole, thus allowing the blind rams to seal the hole. Used primarily in subsea systems. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsBlind-Shear Ram
Closing and sealing component in a ram blowout preventer that first shears the tubular in the wellbore and then seals off the bore or acts as a blind ram if there is no tubular in the wellbore. 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 StandardsBlind Ram
Definition(s)
Blind Ram
Closing and sealing component in a ram BOP that seals the open wellbore.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsBlind Ram
A closing and sealing component in a ram blowout preventer that seals the open wellbore. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global StandardsBlind Rams (blank, master)
Rams whose ends are not intended to seal against any drill pipe or casing. They seal against each other to effectively close the hole. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsBlind Ram
Closing and sealing component in a ram blowout preventer that seals the open wellbore. 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 StandardsBell Nipple
Definition(s)
Bell Nipple
A piece of pipe, with inside diameter equal to or greater than the BOP bore, connected to the top of the BOP or marine riser with a side outlet to direct the drilling fluid returns to the shale shaker or pit. Usually has a second side outlet for the fill-up line connection. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsBell Nipple
A piece of pipe, with inside diameter equal to or greater than the BOP bore, connected to the top of the BOP or marine riser with a side outlet to direct the drilling fluid returns to the shale shaker or pit. Usually has a second side outlet for the fill-up line connection. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsBell Nipple (Mud Riser, Flow Nipple)
A piece of pipe, with inside diameter equal to or greater than the blowout preventer bore, connected to the top of the blowout preventer or marine riser with a side outlet to direct the drilling fluid returns to the shale shaker pit. NOTE: This pipe usually has a second side outlet for the fill-up line connection. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsArticulated Line
Definition(s)
Articulated Line
An articulated line is a choke or kill line assembled as a unit, with rigid pipe, swivel joints, and end connections, designed to accommodate specified relative movement between end terminations. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsAnnular Blowout Preventer
Definition(s)
Annular Blowout Preventer
Blowout preventer that uses an annular-shaped elastomeric sealing element to seal the space between the tubular and the wellbore or an open hole. Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsAnnular Blowout Preventer
A blowout preventer that uses a shaped elastomeric sealing element to seal the space between the tubular and the wellbore or an open hole. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsAnnular Blowout Preventer
Blowout preventer that uses a shaped elastomeric sealing element to seal the space between the tubular and the wellbore or to seal an open hole. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global StandardsAnnular Blowout Preventer
Blowout preventer that uses a shaped elastomeric sealing element to seal the space between the tubular and the wellbore or an open hole. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global StandardsAdapter Spool
Definition(s)
Adapter Spool
A spool used to connect drill-through equipment with different end connections, nominal size designation and/or pressure ratings to each other. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsAdapter Spool
Connects blowout preventers of different sizes or pressure ratings to the casing head. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsAccumulator
Definition(s)
Accumulator (Riser Tensioner)
A pressure vessel charged with gas (nitrogen generally) over liquid that is pressurized on the gas side from the tensioner high-pressure gas supply bottles and supplies high pressure hydraulic fluid to energize the riser tensioner cylinder. 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 StandardsAccumulator (BOP)
A pressure vessel charged with gas (nitrogen) over liquid and used to store hydraulic fluid under pressure for operation of blowout preventers. 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 StandardsAccumulator
A pressure vessel charged with nitrogen or other inert gas and used to store hydraulic fluid under pressure for operation of BOPs. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsAccumulator
A pressure vessel charged with inert gas and used to store hydraulic fluid under pressure. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsAccumulator
A pressure vessel charged with non-reactive or inert gas used to store hydraulic fluid under pressure for operation of blowout preventers. Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global StandardsAccumulator (Riser Tensoiner)
Pressure vessel charged with gas (generally nitrogen) over liquid that is pressurized on the gas side from the tensioner high-pressure gas supply bottles and supplies high-pressure hydraulic fluid to energize the riser tensioner cylinder. 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 StandardsAnnulus
Definition(s)
Annulus
Space between the inner diameter of pipe A and the outer diameter of pipe B when pipe B is positioned inside pipe A.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards