Riser Adapter

Riser Adapter

Definition(s)

Riser Adapter

Crossover between the first riser joint and flex/ball joint on the LMRP.

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

Riser Adapter

Crossover between riser and 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
Response Amplitude Operator (RAO)

Response Amplitude Operator (RAO)

Definition(s)

Response Amplitude Operator

Ratio of a vessel’s motion to the wave amplitude causing that motion and presented over a wide range of wave periods

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

Response Amplitude Operator (RAO)

For regular waves, it is the ratio of a vessel's motion to the wave amplitude causing that motion and presented over a range of wave periods. 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  

Response Amplitude Operator (RAO)

Relationship between wave surface elevation amplitude at a reference location and the vessel response amplitude, and the phase lag between the two. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Response Amplitude Operator (RAO)

Relationship between wave surface elevation amplitude and the vessel response amplitude, and the phase lag between the two. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Response Amplitude Operator (Regular Waves)

Ratio of a vessel's motion to the wave amplitude causing that motion and presented over a range of wave periods. 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
Rated Load

Rated Load

Definition(s)

Rated Load

Load used in the product design, analysis, and performance testing

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

Rated Load

A nominal applied loading condition used during riser design, analysis and testing based on maximum anticipated service loading. 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

Rated Load

Maximum operating load, both static and dynamic, to be applied to the equipment.
  • NOTE: The rated load is numerically equivalent to the design load.
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  

Rated Load

A nominal applied loading condition used during coupling design, analysis, and testing based on a maximum anticipated service loading. Under the rated working load, no average section stress in the riser coupling shall exceed allowable limits established in this specification. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards  

Rated Load

Nominal applied loading condition used during riser design, analysis and testing based on maximum anticipated service loading. See API Spec 16F. 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
Protector

Protector

Definition(s)

Protector, Box or Pin

A cap or cover used to protect the box or pin from damage during storage and handling. 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  

Protector, Box

Cap or cover used to protect the box or pin from damage during storage and handling. 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  

Protector, Pin

Cap or cover used to protect the box or pin from damage during storage and handling. 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  
Preload

Preload

Definition(s)

Preload

Compressive bearing load developed between box and pin members at their interface. This is accomplished by elastic deformation during makeup of the coupling. 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  

Preload

Compressive bearing load developed between box and pin members at their interface; this is accomplished by elastic deformation induced during makeup of the coupling. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Pin

Pin

Definition(s)

Pin

Male 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 Standards

Pin

The male member of a riser coupling or a choke, kill, 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  

Pin

Male member of a riser coupling or a choke, kill or auxiliary line stab assembly. 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
Nominal Stress

Nominal Stress

Definition(s)

Nominal Stress

Stress calculated using nominal dimensions at the desired location away from local peak stresses.

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

Nominal Stress

Stress calculated using the nominal pipe wall dimensions of the riser at the location of concern. 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  

Nominal Stress

Stress calculated in a sectional area, including the stress raising effects of the macro-geometrical shape of the component of which the section forms a part, but disregarding the local stress raising effects from the section shape and any weldment or other fixing detail. NOTE Overall elastic behaviour is assumed when calculating nominal stresses. [ISO 19902:2007, definition 3.34]. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards
Nipple Up

Nipple Up

Definition(s)

Nipple Up

To assemble a system of fluid handling components. 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  

Nipple Up

Assemble a system of fluid handling components. 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  
Mud Boost Line

Mud Boost Line

Definition(s)

Mud Boost Line

Auxiliary line that provides supplementary fluid supply from the surface to (or near) the LMRP to assist in the circulation of drill cuttings up the marine riser.

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

Mud Boost Line

An auxiliary line which provides supplementary fluid supply from the surface and injects it into the riser at the LMRP to assist in the circulation of drill cuttings up the marine riser, when required. 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  

Mud-Boost Line

Auxiliary line that provides supplementary drilling fluid from the surface and injects it into the riser at the top of the LMRP to assist in the circulation of drill cuttings up the marine riser, when required. 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
Maximum Tensioner Setting

Maximum Tensioner Setting

Definition(s)

Maximum Tensioner Setting

See Section 2.4.3.g. 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  

Maximum Tensioner Setting

Maximum setting that, when added with dynamic variations, is less than the dynamic tension limit. 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  
Maring Drilling Riser

Maring Drilling Riser

Definition(s)

Maring Drilling Riser

A tubular conduit serving as an extension of the well bore from the equipment on the wellhead at the seafloor to a floating drilling rig. 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  
Makeup Tool

Makeup Tool

Definition(s)

Makeup Tool

Device used to engage and disengage coupling members.

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

Makeup Tool (Preload Tool)

A device used to engage and/or preload coupling members. 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  

Make-up Tool

Tool to facilitate the make-up of the riser joint connectors. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
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