Makeup Time

Makeup Time

Definition(s)

Makeup Time (Riser Coupling)

Total clock time to fully engage the male coupling to the female coupling during riser deployment.
  • NOTE: This may include makeup of riser flanges, seal sub, and flange bolts and torque bolts during riser deployment.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Makeup Time (Riser Coupling)

Begins when the box and pin are stabbed, ends when the coupling is fully preloaded. 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  

Make-up Time (Riser Coupling)

Time period beginning when the box and pin are stabbed and ending when the coupling is fully preloaded. 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 Standards
Madeup Length

Madeup Length

Definition(s)

Madeup Length

The actual length contributed to a riser string by a made-up riser component (overall component length minus box/pin engagement). 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 Standards  
Local Peak Stress

Local Peak Stress

Definition(s)

Local Peak Stress

Highest stress in the region or component under consideration that causes no significant distortion and is principally objectionable as a possible initiation site for a fatigue crack.
  • NOTE: 1 These stresses are highly localized and occur at geometric discontinuities.
  • NOTE: 2 This is sometimes referred to as hot spot stress.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Local Peak Stress

Highest stress in the region or component under consideration. The basic characteristic of a peak stress is that it causes no significant distortion and is principally objectionable as a possible initiation site for a fatigue crack. These stresses are highly localized and occur at geometric discontinuities. Sometimes referred to as hot spot stress. 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  

Local Peak Stress

Highest stress in the region or component under consideration. NOTE: The basic characteristic of a peak stress is that it causes no significant distortion and is principally objectionable as a possible initiation site for a fatigue crack. These stresses are highly localized and occur at geometric discontinuities. 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 Standards
Landing Shoulder

Landing Shoulder

Definition(s)

Landing Shoulder

A shoulder or projection on the external surface of a riser coupling or other riser component for supporting the riser and BOP stack during deployment and retrieval. Sometimes referred to as Riser Support Shoulder. 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  

Landing Shoulder

Shoulder or projection on the external surface of a riser coupling or other riser component for supporting the riser and BOP stack during deployment and retrieval. 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 Standards  
Landing Joint

Landing Joint

Definition(s)

Landing Joint

Riser joint installed temporarily above the telescopic joint and used to land the BOP stack on the wellhead.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Landing Joint

A riser joint temporarily attached above the telescopic joint used to land the BOP stack on the wellhead when the telescopic joint is collapsed and pinned. 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
Kill Line

Kill Line

Definition(s)

Kill Line

See Choke and Kill Lines. 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  

Kill Line

The high-pressure piping between the pumps and BOP outlets or wellhead outlets. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  

Kill Line

A high-pressure line from the mud pumps to a connection below a BOP that allows fluid to be pumped into the well or annulus with the BOP closed during well control operations. 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 Standards  

Kill Line

High-pressure line between the mud pump and the blowout preventer to facilitate the pumping of fluid into the hole to overcome well pressure with the preventers closed. Source: IADC UBO / MPD Glossary, December 2011. Global Standards  

Kill Line

External conduit arranged laterally along the riser pipe and used for circulation of fluids into and out of the wellbore to control well pressurelanding joint riser joint temporarily attached above the telescopic joint used to land the BOP stack on the wellhead when the telescopic joint is collapsed and pinned. 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 Standards  
Keyseating

Keyseating

Definition(s)

Keyseating

Formation of a longitudinal slot on the ID of a riser component due to a loss of material caused by friction wear from the rotating drill string or tripping equipment.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Keyseating

The formation of a longitudinal slot in the bore of a riser system component caused by frictional wear of the rotating drill string on the riser component. 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  

Key-Seating

Formation of a longitudinal slot in the bore of a riser system component caused by frictional wear of the rotating drillstring on the riser component. 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 Standards
Jumper Hose

Jumper Hose

Definition(s)

Jumper Hose

A flexible section of choke, kill, or auxiliary line that provides a continuous flow around a flex/ball joint while accommodating the angular motion at the flex/ball joint. 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 Standards  

Jumper Hose

A flexible hose assembly used to convey high-pressure drilling liquids that is located anywhere in the high-pressure mud piping system between the mud-pump discharge outlet and the mud standpipe manifold on the drill floor to accommodate relative movement between them. Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards  
Instrumented Riser Joint

Instrumented Riser Joint

Definition(s)

Instrumented Riser Joint

Riser joint equipped with sensors for collecting and transmitting data such as riser pipe tension, riser angular offset, annulus fluid temperature, pressure, etc.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Instrumented Riser Joint (IRJ)

A riser joint equipped with sensors for monitoring parameters such as tension in the riser pipe wall, riser angular offset, annulus fluid temperature and pressure, etc. 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 Standards
Hydraulic Supply Line

Hydraulic Supply Line

Definition(s)

Hydraulic Supply Line

Auxiliary line from the vessel to the subsea LMRP control pods that supplies system operating fluid to the LMRP and the lower stack control functions.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Hydraulic Supply Line

An auxiliary line from the vessel to the subsea BOP stack that supplies control system operating fluid to the LMRP and BOP stack. 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 Standards
Hydraulic Connector

Hydraulic Connector

Definition(s)

Hydraulic Connector

Mechanical device that is activated by hydraulic pressure and connects and seals the BOP stack to the wellhead or the LMRP to the lower stack.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Hydraulic Connector

A mechanical connector that is activated hydraulically and connects the BOP stack to the wellhead or the LMRP to the BOP stack. 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: 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 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 Standards  

Hydraulic Connector

Mechanical connector that is activated hydraulically. 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 Standards  

Hydraulic Connector

Hydraulically actuated drill-through equipment that locks and seals on end connections. 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 Standards
Hot Spot Stress

Hot Spot Stress

Definition(s)

Hot Spot Stress

See Local Peak Stress. 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  

Hot Spot Stress

Highest stress in the region or component under consideration. NOTE The basic characteristic of a peak stress is that it causes no significant distortion and is principally objectionable as a possible initiation site for a fatigue crack. These stresses are highly localized and occur at geometric discontinuities. 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 Standards  
Heave

Heave

Definition(s)

Heave

Vessel motion in the vertical direction. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards 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: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). 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 Standards    
Handling Tool

Handling Tool

Definition(s)

Handling Tool (Running Tool)

A device that joins to the upper end of a riser joint to permit lifting and lowering of the joint and the assembled riser string in the derrick by the elevators. 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 Standards  
Guidelineless Reentry

Guidelineless Reentry

Definition(s)

Guidelineless Reentry

Establishment of pressure containing connection between the BOP stack and the subsea wellhead or between the LMRP and the lower stack using a TV image and/or acoustic signals instead of guidelines to guide the orientation and alignment.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Guidelineless Reentry

Establishment of pressure containing connection between the BOP stack and the subsea wellhead or between the LMRP and the BOP stack using a TV image and/or acoustic signals instead of guidelines to guide the orientation and alignment. 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 Standards
Gooseneck

Gooseneck

Definition(s)

Gooseneck

Type of terminal fitting designed to achieve a nominal 180° change in flow direction.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Gooseneck

A type of terminal fitting using a pipe section with a semicircular bend to achieve a nominal 180" change in flow direction. 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 Standards
Flex Joint

Flex Joint

Definition(s)

Flex Joint

Ball joint. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards  

Flex Joint

Device(s) installed between the bottom of the diverter and the telescopic joint (upper flex or ball joint), in the top section of the LMRP (lower flex or ball joint), or under a keel joint (intermediate flex or ball joint, if used), to permit relative angular movement of the riser and reduce stresses due to vessel motion and environmental forces.
  • NOTE: Upper flex ball joint is sometimes called a diverter flex ball joint.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Flex Joint

A steel and elastomer assembly having central through-passage equal to or greater in diameter than the riser bore that may be positioned in the riser string to reduce local bending stresses. 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  

Flex Joint

Laminated metal and elastomer assembly, having a central through-passage equal to or greater in diameter than the interfacing pipe or tubing bore, that is positioned in the riser string to reduce the local bending stresses. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Flex Joint

Steel and elastomer assembly that has a central through-passage equal to or greater in diameter than the riser bore and that may be positioned in the riser string to reduce local bending stresses. 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 Standards
Fleet Angle

Fleet Angle

Definition(s)

Fleet Angle (for riser tensioners)

In marine riser nomenclature, the angle between the vertical axis and a riser tensioner line or the hydraulic cylinder rod (for direct-acting tensioners) at the point where the line (rod) connects to the telescopic joint.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Fleet Angle

In marine riser nomenclature, the fleet angle is the angle between the vertical axis and a riser tensioner line at the point where the line connects to the telescopic joint. See Figure 1.1. 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  

Fleet Angle

Angle between the vertical axis and a riser tensioner line at the point where the line connects to the telescopic joint. 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 Standards
Flange-Type Coupling

Flange-Type Coupling

Definition(s)

Flange-Type Coupling

Coupling having two flanges joined by threaded fasteners.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Flange-Type Coupling

A coupling having two flanges joined by bolts. 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: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. 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 Standards
Fail Safe

Fail Safe

Definition(s)

Fail Safe

Term applied to equipment or a system so designed that, in the event of failure or malfunction of any part of the system, devices are automatically activated to stabilize or secure the safety of the operation. 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: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). 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 Standards  
Factory Acceptance Testing

Factory Acceptance Testing

Definition(s)

Factory Acceptance Testing

Testing by the manufacturer to verify product performance to applicable specifications.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Factory Acceptance Testing

Testing by a manufacturer of a particular product to validate its conformance to performance specifications and ratings. 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: 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 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 Standards  

Factory Acceptance Test (FAT)

Test conducted by the manufacturer to verify that the manufacture of a specific assembly meets all intended functional and operational requirements. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Effective Weight

Effective Weight

Definition(s)

Effective Weight

Total submerged weight including contents (drilling mud, etc.) of an entire riser or a section of a riser.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Effective Weight

See Apparent Weight. 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  

Effective Weight

Submerged weight including content minus buoyancy. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Effective Weight

Weight minus buoyancy. NOTE Apparent weight is commonly referred to as weight in water, wet weight, submerged weight, or effective weight. 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 Standards
Effective Tension

Effective Tension

Definition(s)

Effective Tension

Actual tension (a.k.a. “TREAL”) in the pipe minus the internal pressure times the internal area of the riser plus the external pressure times the external area of the riser TEFF = TREAL–piAi + poAo

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Effective Tension

Axial tension in the pipe less the internal pressure times the internal area of the pipe plus the external pressure times the outside area of the pipe.
  • NOTE: Effective tension accounts for the effects of hydrostatic pressure in structural analysis of pipe.
Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Effective Tension

See the equation in Section 3.4.3. 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  

Effective Tension

Axial tension calculated at any point along a riser by considering only the top tension and the apparent weight of the riser and its contents (tension positive).
  • NOTE: Global buckling and geometric stiffness is governed by the effective tension.
Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Effective Tension

Tension that controls the stability of risers. 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 Standards
Effective Hydraulic Cylinder Area

Effective Hydraulic Cylinder Area

Definition(s)

Effective Hydraulic Cylinder Area

Net area of the cylinder inside diameter (ID) subjected to internal pressure.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Effective Hydraulic Cylinder Area

Net area of moving parts exposed to tensioner hydraulic pressure. 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 Standards
Drive On

Drive On

Definition(s)

Drive On

An unintended move of a dynamically positioned vessel off location driven by the vessel's main propulsion or stationkeeping 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 Standards  
Drift Off

Drift Off

Definition(s)

Drift Off

Unintended lateral move of a dynamically positioned (DP) vessel off of its intended location relative to the wellhead, generally caused by the loss of stationkeeping control or propulsion.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Drift Off

An unintended lateral move of a dynamically positioned vessel off of its intended location relative to the wellhead, generally caused by loss of stationkeeping control or propulsion. 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: 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 Standards  

Drift-Off

Unintended lateral movement of a dynamically positioned vessel off its intended location relative to the wellhead, generally caused by loss of station-keeping control or propulsion. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). 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 Standards
Drape Hose

Drape Hose

Definition(s)

Drape Hose

Moonpool line. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards  

Drape Hose

Flexible line connecting a choke, kill, and auxiliary line terminal fitting on the telescopic joint to the appropriate piping on the rig structure.
  • NOTE: A U-shaped bend in this flexible line accommodates vessel and telescopic joint inner barrel movement, while the outer barrel remains fixed and under tension.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Drape Hose

A flexible line connecting a choke, kill, or auxiliary line terminal fitting on the telescopic joint to the appropriate piping on the rig structure. A U-shaped bend or "drape" in this line allows for relative movement between the inner barrel of the telescopic joint and the outer barrel of the telescopic joint as the vessel moves. 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  

Drape Hose

Flexible line connecting a choke, kill or auxiliary line terminal fitting on the telescopic joint to the appropriate piping on the rig structure. NOTE: A U-shaped bend or “drape” in this line allows for relative movement between the inner barrel of the telescopic joint and the outer barrel of the telescopic joint as the vessel moves. 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 Standards
Dog-Type Coupling

Dog-Type Coupling

Definition(s)

Dog-Type Coupling

Coupling having wedges (dogs) that are mechanically driven to engage the pin and box coupling members.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Dog-Type Coupling

A coupling having wedges (dogs) that are mechanically driven between the box and pin for engagement. 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 Standards  

Dog-Type Coupling

A coupling having dogs which act as wedges mechanically driven between the box and pin for engagement. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Coupling

Coupling

Definition(s)

Coupling

Mechanical means for joining two sections of riser pipe end-to-end.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Coupling

A mechanical means for joining two sections of riser pipe in end-to-end engagement. 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 Standards  

Coupling

Internally threaded cylinder for joining two lengths of threaded pipe. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global Standards  

Coupling

A mechanical means for connecting two joints of riser pipe end-to-end. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Choke and Kill (C&K) Lines

Choke and Kill (C&K) Lines

Definition(s)

Choke and Kill (C&K) Lines

External conduits arranged laterally along the riser pipe and used for circulation of fluids into and out of the well bore to control well pressure. 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  

Choke and Kill (C&K) Lines

External conduits, arranged parallel to the main tube, used for circulation of fluids to control well pressure. Choke and kill lines are primary pressure-containing members. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards