ISU

ISU

Definition(s)

ISU

Integrated service umbilical. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
HNBR

HNBR

Definition(s)

HNBR

Hydrogenated nitrile rubber. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
HDPE

HDPE

Definition(s)

HDPE

High density polyethylene. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  

HDPE

“HDPE” means high-density polyethylene. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations  
DOF

DOF

Definition(s)

DOF

Degrees of freedom. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
DBS

DBS

Definition(s)

DBS

Dibutyl sebacate. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
DA

DA

Definition(s)

DA

Dynamic application. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
CR

CR

Definition(s)

CR

Polychloroprene. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
CPE

CPE

Definition(s)

CPE

Chlorinated polyethylene. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Tensioner

Tensioner

Definition(s)

Tensioner

Mechanical device used to support or apply tension to a pipe during installation. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
Subsea Buoy

Subsea Buoy

Definition(s)

Subsea Buoy

Concentrated buoyancy system. NOTE This system generally consists of steel or syntactic foam tanks, as used in S-type riser configurations (4.4.5). See also buoyancy module (3.1.5). Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
Steep-S

Steep-S

Definition(s)

Steep-S

Lazy-S with a touchdown point fixed to the seabed. NOTE See Figure 4. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
Steep Wave

Steep Wave

Definition(s)

Steep Wave

Lazy wave with a touchdown point fixed to the seabed. NOTE See Figure 4. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
Riser Hang-Off

Riser Hang-Off

Definition(s)

Riser Hang-Off

Structure for supporting a riser at the connection to a platform. EXAMPLE Jacket, semi-sub, tanker, etc. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
Reel

Reel

Definition(s)

Reel

Large-diameter structure used for storage of long lengths of flexible pipe, which rotates about a horizontal axis. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  

Reel

Device for storing, transporting, or installing umbilicals or components comprised of two flanges, separated by a barrel, with the barrel axis normally being horizontal. NOTE Reels are designed for the intended use. Source: API SPEC 17E, Specification for Subsea Umbilicals, Upstream Segment, Fourth Edition, October 2010. Global Standards
Rapid Decompression

Rapid Decompression

Definition(s)

Rapid Decompression

Sudden depressurization of a system during which gas in the pipe expands rapidly and can cause blistering or collapse of the internal pressure sheath or other gas-saturated layers. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Piggy Back

Piggy Back

Definition(s)

Piggy Back

Attachment of two parallel and adjacent independent pipes, rigid or flexible, over a significant length. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
Ovalization

Ovalization

Definition(s)

Ovalization

Out-of-roundness of the pipe, calculated as follows: (Dmax – Dmin) / (Dmax + Dmin), where Dmax and Dmin are maximum and minimum pipe outside diameter, respectively. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  

Ovalization

Deviation of the circumference from a circle which has the form of an elliptic cross section. 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
Multiple Configuration

Multiple Configuration

Definition(s)

Multiple Configuration

Riser system with more than one riser connected at a mid-depth location. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Mulitbore

Mulitbore

Definition(s)

Multibore

Multiple flexible pipes or umbilicals contained in a single construction with an outer sheath extruded over the bundle. NOTE See 4.3.7. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Lazy-S

Lazy-S

Definition(s)

Lazy-S

Free-hanging catenary modified by a section with concentrated buoyancy modules NOTE See Figure 4. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Lazy Wave

Lazy Wave

Definition(s)

Lazy Wave

Free-hanging catenary modified by a section with distributed buoyancy modules. NOTE See Figure 4. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Integrated Service Umbilical

Integrated Service Umbilical

Definition(s)

Integrated Service Umbilical (ISU™1)

Structure in which the inner core is a standard flexible pipe construction. NOTE 1 Umbilical components are wound around the core pipe and covered with a protective outer sheath (see 4.3.6). NOTE 2 ISU is a trademark of Coflexip Stena Offshore. 1) ISU™ is an example of a suitable product available commercially. This information is given for the convenience of users of this part of ISO 13628 and does not constitute an endorsement by ISO of this product. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Free-Hanging Catenary

Free-Hanging Catenary

Definition(s)

Free-Hanging Catenary

Riser configuration that spans the water column in a catenary shape modified by the bending stiffness of the riser. NOTE See Figure 4. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards
End Fitting

End Fitting

Definition(s)

End Fitting

Termination in a flexible pipe. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  

End Fitting

Mechanical device which forms the transition between the flexible pipe body and the connector whose different pipe layers are terminated in the end fitting in such a way as to transfer the load between the flexible pipe and the connector. Source: API SPEC 17J, Specification for Unbonded Flexible Pipe, Third Edition, July 2008. Global Standards  
Carousel

Carousel

Definition(s)

Carousel

Device used for storage and transport of very long lengths of flexible pipe and which rotates about a vertical axis. NOTE Pipe is wound under tension around the centre hub. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  

Carousel

Storage container that can be rotated by a drive about a vertical axis. Source: API SPEC 17E, Specification for Subsea Umbilicals, Upstream Segment, Fourth Edition, October 2010. Global Standards  
Bird-Caging

Bird-Caging

Definition(s)

Bird-Caging

Buckling of the tensile-armour wires, usually caused by extreme axial compression, which results in significant radial deformation. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  

Bird-Caging

Phenomenon whereby armour wires locally rearrange with an increase and/or decrease in pitch-circle diameter as a result of accumulated axial and radial stresses in the armour layer(s). Source: API SPEC 17E, Specification for Subsea Umbilicals, Upstream Segment, Fourth Edition, October 2010. Global Standards  
Basket

Basket

Definition(s)

Basket

Device used for storage and transport of flexible pipe. NOTE All pipes are laid freely into the basket. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  

Basket

“Basket” means a personnel transfer basket (nacelle). Source: Canada Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, February 2013. Regulations Source: Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, Canada, current to April 29, 2013. Regulations  
Arrhenius Plot

Arrhenius Plot

Definition(s)

Arrhenius Plot

Log-linear scale used to plot service life against the inverse of temperature for some polymer materials. Source: API RP 17B, Recommended Practice for Flexible Pipe, Fourth Edition, July 2008. Global Standards  
Wellhead Connector

Wellhead Connector

Definition(s)

Wellhead Connector (Stack Connector)

See hydraulic connector.

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

Wellhead Connector (Stack Connector)

A hydraulically operated connector that joins the BOP stack to the subsea wellhead. 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
Vortex Induced Vibration

Vortex Induced Vibration

Definition(s)

Vortex Induced Vibration

The in-line and transverse oscillation of a riser in a current induced by the periodic shedding of vortices. 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  

Vortex-Induced Vibration

In-line and transverse oscillation of a riser caused by current-induced periodic shedding of vortices. 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