Dynamic Positioning (Automatic Station Keeping)

Dynamic Positioning (Automatic Station Keeping)

Definition(s)

Dynamic Positioning (Automatic Station Keeping)

A computerized means of maintaining a vessel on location by selectively driving thrusters. 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
“Dunking” Transducer

“Dunking” Transducer

Definition(s)

“Dunking” Transducer

A portable hydrophone. 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
Disconnect

Disconnect

Definition(s)

Disconnect

1. Unlatch and separation of the LMRP connector from its mandrel. 2. Unlatch and separation of the BOP stack connector from the wellhead. 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
Disarm

Disarm

Definition(s)

Disarm

To disable the operation of a critical function or functions. 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
Dedicated

Dedicated

Definition(s)

Dedicated

An element or system that is exclusively used for a specific purpose. 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
Control Valve (Subsea Control System)

Control Valve (Subsea Control System)

Definition(s)

Control Valve (Subsea Control System)

A pilot operated valve in the subsea control pod that directs power fluid to operate a function. 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
Control Valve (Surface Control System)

Control Valve (Surface Control System)

Definition(s)

Control Valve (Surface Control System)

A valve mounted on the hydraulic manifold which directs hydraulic power fluid to the selected function (such as annular BOP close) while simultaneously venting the opposite function (annular BOP open). 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
Control Panel

Control Panel

Definition(s)

Control Panel

An enclosure displaying an array of switches, push buttons, lights and/or valves and various pressure gauges or meters to control or monitor functions. Control panel types include: diverter panel; rig floor panel; master panel; and mini or auxiliary remote panel. All of these panels are remote from the main hydraulic manifold and can be pneumatic, electric or hydraulic powered. 1. Diverter Panel—A panel that is dedicated to the diverter and flowline system functions. 2. Rig Floor Panel (Driller’s Panel)—The BOP control panel mounted near the driller’s position on the rig floor. 3. Master Panel (Hydraulic or Electric)—The panel mounted in close proximity to the primary power fluid supply. All control functions are operable from this panel including all required regulators, gauges, meters, audible alarms, and visible alarms. 4. Mini or Auxiliary Remote Panel (Toolpusher’s Panel)—A full or limited function panel mounted in a remote location for use as an emergency backup. 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
Control Line

Control Line

Definition(s)

Control Line

A flexible hose or rigid line that transmits control fluid. 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
Control Hose Bundle

Control Hose Bundle

Definition(s)

Control Hose Bundle

A group of pilot and/or supply and/or control hoses assembled into a bundle covered with an outer protective sheath. 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
Control Fluid

Control Fluid

Definition(s)

Control Fluid

Hydraulic oil, water based fluid, or gas which, under pressure, pilots the operation of control valves or directly operates functions. 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
Commodity Item

Commodity Item

Definition(s)

Commodity Item

A manufactured product purchased by the control system manufacturer for use in the construction of control systems for drilling well control equipment. 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
Closing Unit (Closing System)

Closing Unit (Closing System)

Definition(s)

Closing Unit (Closing System)

See BOP control system. 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
Choke And Kill Valves

Choke And Kill Valves

Definition(s)

Choke And Kill Valves

BOP stack-mounted valves that are connected below selected BOPs to allow access to the wellbore to either choke or kill the well. 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
Central Control Unit (CCU)

Central Control Unit (CCU)

Definition(s)

Central Control Unit (CCU)

The central control point for control and monitoring system functions and communications. 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
BOP Stack Maximum Rated Wellbore Pressure

BOP Stack Maximum Rated Wellbore Pressure

Definition(s)

BOP Stack Maximum Rated Wellbore Pressure

The pressure containment rating of the ram BOPs in a stack. Note: In the event that the rams are rated at different pressures, the BOP stack maximum rated wellbore pressure is considered equal to the lowest rated ram BOP pressure. In stacks that do not contain any ram BOP, the BOP stack maximum rated wellbore pressure is considered equal to the lowest rated BOP pressure. 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
BOP Control System

BOP Control System

Definition(s)

BOP Control System

The system of pumps, valves, accumulators, fluid storage and mixing equipment, manifold, piping, hoses, control panels and other items necessary to hydraulically operate the BOP equipment. 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
BOP Closing Ratio (Ram BOP)

BOP Closing Ratio (Ram BOP)

Definition(s)

BOP Closing Ratio (Ram BOP)

A dimensionless factor equal to the area of the piston operator divided by area of the ram shaft. 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
Block Position

Block Position

Definition(s)

Block Position

The center position of a three-position control valve. 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
Blind Ram BOP

Blind Ram BOP

Definition(s)

Blind Ram BOP

A BOP having rams which seal against each other to close the wellbore in the absence of any pipe. 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
Backup

Backup

Definition(s)

Backup

An element or system that is intended to be used only in the event that the primary element or system is non-functional. 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  

Backup

Redundant equipment available to complete an operation in the event the primary equipment fails. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Arm

Arm

Definition(s)

Arm

To enable the operation of a critical function or functions. 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
Annular BOP

Annular BOP

Definition(s)

Annular BOP

A device with a generally toroidal shaped steel-reinforced elastomer packing element that is hydraulically operated to close and seal around any drill pipe size or to provide full closure of the wellbore. 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    
Air Pump/Air-Powered Pump

Air Pump/Air-Powered Pump

Definition(s)

Air Pump/Air-Powered Pump

Air driven hydraulic piston pump. 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
Acoustic Control System

Acoustic Control System

Definition(s)

Acoustic Control System

A subsea control system that uses coded acoustic signals for communications and is normally used as an emergency backup having control of a few selected critical functions. 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
Accumulator Precharge

Accumulator Precharge

Definition(s)

Accumulator Precharge

An initial inert gas charge in an accumulator, which is further compressed when the hydraulic fluid is pumped into the accumulator, thereby storing potential energy. 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
Accumulator Bank

Accumulator Bank

Definition(s)

Accumulator Bank

An assemblage of multiple accumulators sharing a common manifold. 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
Weld, Pressure Containing

Weld, Pressure Containing

Definition(s)

Weld, Pressure Containing

A weld, the absence of which will reduce the pressure containing integrity of the part. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards  

Weld, Pressure Containing

A weld, the failure of which will reduce the pressure-containing integrity of the component. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards  
Weld, Non-Pressure Containing

Weld, Non-Pressure Containing

Definition(s)

Weld, Non-Pressure Containing

A weld, the absence of which will not reduce the pressure containing integrity of the part. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards  

Weld, Non-Pressure Containing

A weld the failure of which will not reduce the pressure-containing integrity of the component. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards
Weld, Fabrication

Weld, Fabrication

Definition(s)

Weld, Fabrication

A weld joining two or more parts. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards