Certified Verification Agent

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.
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 Standards
CBS

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 Standards  

CBS

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 Standards

CBS

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 Standards  

CBS

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 Standards
Catalog Break Strength

Catalog 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 Standards  

Catalog 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 Standards
Basic Yarn

Basic 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 Standards
As-installed Length

As-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 Standards
Zoning

Zoning

Definition(s)

Zoning

All equipment should meet API RP 500 for zoning purposes. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Z factor

Z 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 Standards
Yielding

Yielding

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 Standards
Weight

Weight

Definition(s)

Weight

Measure of gravitational force on an object. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Water Hammer

Water 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 Standards

Water 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 Standards
Wafer Check Valve

Wafer 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 Standards
w.t

w.t

Definition(s)

w.t

Abbreviation for pipe wall thickness. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Vibration

Vibration

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 Standards

Vibration

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

Vibration

Three-dimensional motion a machine exhibits from its static state. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Vertical Inline Pumps

Vertical Inline Pumps

Definition(s)

Vertical Inline Pumps

Single-stage vertical pumps with top-mounted motors. Suction and discharge nozzles arranged so the pump cases can be conveniently fitted into and supported by the piping. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Vena Contracta

Vena Contracta

Definition(s)

Vena Contracta

Point of lowest pressure is just downstream of the actual orifice at a distance of about half the diameter of the orifice downstream. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Velocity Transients

Velocity Transients

Definition(s)

Velocity Transients

Pressure waves occurring when there is a change in flow rate caused by a change in fluid energy in the line or vessel. Also known as pressure transients. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Variable Speed Drive

Variable Speed Drive

Definition(s)

Variable Speed Drive

A system using a VFD. Pumps that use VFD have the same system curve but the changed rotational speed creates a new pump curve and operating point. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Valve Positioners

Valve Positioners

Definition(s)

Valve Positioners

Valve positioners compare the control signal to the actuator's position and move the actuator accordingly. Source: IADC UBO / MPD Glossary, December 2011. Global Standards