Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Creep Rupture
Definition(s)
Creep Rupture
Rope failure due to cumulative, irrecoverable elongation of a fiber rope under load over time. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsConstruction Stretch
Definition(s)
Construction Stretch
The permanent elongation caused by the maximum historical load that the rope has experienced during the lifetime of the rope, primarily due to bedding-in of the rope and fibers. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsCVA
Definition(s)
CVA
Certified verification agent. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsCVA
An independent third-party who verifies that applicable technical specifications and drawings are adhered to during the rope design, manufacturing process, and deployment.- NOTE: The CVA acts on behalf of, and is certified by, the owner and/or pertinent regulatory agency.
Certified Verification Agent
Definition(s)
Certified Verification Agent
An independent third-party who verifies that applicable technical specifications and drawings are adhered to during the rope design, manufacturing process, and deployment.- NOTE: The CVA acts on behalf of, and is certified by, the owner and/or pertinent regulatory agency.
CBS
Definition(s)
CBS
Catalog breaking strength. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global StandardsCBS
Catalog break strength. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsCBS
The manufacturer's design or target break strength for the rope assembly, including terminations. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsCBS
In this document, the catalog breaking strength (CBS) is defined as the manufacturer’s design or target break strength for the rope assembly, including terminations. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global StandardsCatalog Break Strength
Definition(s)
Catalog Break Strength
The manufacturer's design or target break strength for the rope assembly, including terminations. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsCatalog Break Strength
In this document, the catalog breaking strength (CBS) is defined as the manufacturer’s design or target break strength for the rope assembly, including terminations.
Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global StandardsBasic Yarn
Definition(s)
Basic Yarn
The smallest yarn-like component of the rope, generally as received from the yarn producer; however, the producer may carry out some of the intermediate yarn assembly steps. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsAs-installed Length
Definition(s)
As-installed Length
After installation, the total length of the synthetic mooring line (at zero load) is the as-purchased length plus the installation stretch. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global StandardsZoning
Definition(s)
Zoning
All equipment should meet API RP 500 for zoning purposes. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsZ factor
Definition(s)
Z factor
The factor used to compensate for change in density of gas with temperature and pressure not accounted for in the ideal gas law (PV=nRT). Source: IADC UBO / MPD Glossary, December 2011. Global StandardsYielding
Definition(s)
Yielding
The permanent deformation of the steel walls of a line or vessel caused when the MOP is exceeded. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsWeymouth Formula
Definition(s)
Weymouth Formula
Equation used to calculate flow in line or vessels. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsWet Gas
Definition(s)
Wet Gas
Gas containing water or condensate vapor. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsWeight
Definition(s)
Weight
Measure of gravitational force on an object. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsWater Hammer
Definition(s)
Water Hammer
Shock load or high-pressure surge caused by sudden halting of flow in a pipeline or piping system. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsWater Hammer
Pressure wave created by the rapid closing of a valve on a flowing line or vessel. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsWafer Check Valve
Definition(s)
Wafer Check Valve
Variety of check valve that has a two-piece disk, hinged down the diameter of the pipe. Flow pushes the valve into the open position. When there is no flow, a spring pushes the disk shut to prevent back flow. Source: IADC UBO / MPD Glossary, December 2011. Global Standardsw.t
Definition(s)
w.t
Abbreviation for pipe wall thickness. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsVolume
Definition(s)
Volume
The space occupied by an object. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsVolatility
Definition(s)
Volatility
Measure of how easily a liquid will vaporize. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsViscometer
Definition(s)
Viscometer
Instrument that measures the viscosity of a fluid. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsVibration
Definition(s)
Vibration
In-line and transverse oscillation of the riser string as the result of the periodic shedding of vortices from sea currents.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsVibration
The maximum uplift force during spudcan extraction
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards