Bolting, Closure

Bolting, Closure

Definition(s)

Bolting, Closure

Threaded fasteners used to assemble API Spec 16RCD pressure-containing parts other than end and outlet connections. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards
Active Seal Relaxed Diameter

Active Seal Relaxed Diameter

Definition(s)

Active Seal Relaxed Diameter

The inside diameter through the active packing element when in the fully open condition (no hydraulic closing pressure applied and after closing to manufacturers minimum specified diameter). Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards
Pure Shear Stress

Pure Shear Stress

Definition(s)

Pure Shear Stress

A pure shear stress in a section is the average stress induced by a force transverse to the section. It is averaged over the total area of the section and is calculated using the classical shear stress equation (S = F/A). An example of a pure shear stress is the average shear stress in the threads of a threaded coupling. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Local Membrane Stress

Local Membrane Stress

Definition(s)

Local Membrane Stress

If a membrane stress is averaged only over a localized portion of a cross-section, it is a local membrane stress. An example of a local membrane stress is the axial stress averaged over the area adjacent to the window of a dog coupling. Determining the area used for averaging a local stress requires judgement. Using a very small area results in the peak stress, not the local membrane stress. On the other hand, averaging over too large an area results in the general membrane stress, not the local membrane stress. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
General Membrane Stress

General Membrane Stress

Definition(s)

General Membrane Stress

If a membrane stress is averaged over an entire cross-section, it is a general membrane stress. An example of a general membrane stress is the average axial stress in a pipe loaded in tension. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Threaded Coupling

Threaded Coupling

Definition(s)

Threaded Coupling

A coupling having matching threaded members to form engagement. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Collet-Type Coupling

Collet-Type Coupling

Definition(s)

Collet-Type Coupling

A coupling having a slotted cylindrical element joining mating coupling members. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Riser Coupling Pin

Riser Coupling Pin

Definition(s)

Riser Coupling Pin

The male coupling member. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Riser Coupling Box

Riser Coupling Box

Definition(s)

Riser Coupling Box

The female coupling member. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards
Buoyancy

Buoyancy

Definition(s)

Buoyancy

Devices added to the riser joints to reduce their submerged weight. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards  
Wellhead Connector (Stack Connector)

Wellhead Connector (Stack Connector)

Definition(s)

Wellhead Connector (Stack Connector)

A hydraulically-operated connector that joins the BOP stack to the subsea 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  
Water-Based Hydraulic Fluid

Water-Based Hydraulic Fluid

Definition(s)

Water-Based Hydraulic Fluid

A control liquid mixture composed mainly of water with additives to provide lubricity, anti-foaming, anti-freeze, anti-corrosion and anti-bacterial characteristics. 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
Volumetric Efficiency (VE)

Volumetric Efficiency (VE)

Definition(s)

Volumetric Efficiency (VE)

The ratio of deliverable fluid volume to total gas volume of a bottle, based on design conditions and calculation method (see 4.2.3.1). 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
Vent-To-Environment Circuit

Vent-To-Environment Circuit

Definition(s)

Vent-To-Environment Circuit

A hydraulic or pneumatic control circuit in which spent fluid is vented locally to sea or atmosphere. 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
Vent Position

Vent Position

Definition(s)

Vent Position

The position of a control valve that vents spent fluid to ambient or to the reservoir. 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
Usable Hydraulic Fluid

Usable Hydraulic Fluid

Definition(s)

Usable Hydraulic Fluid

The fluid volume recoverable from the accumulator system between the system rated working pressure and the minimum operating 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
System Rated Working Pressure

System Rated Working Pressure

Definition(s)

System Rated Working Pressure

The maximum design pressure at which control fluid is stored in the accumulator assembly. 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
Straight-Through Function

Straight-Through Function

Definition(s)

Straight-Through Function

Subsea function that is directly operated by a pilot signal without interface with a podmounted pilot-operated 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
Stored Hydraulic Fluid Volume

Stored Hydraulic Fluid Volume

Definition(s)

Stored Hydraulic Fluid Volume

The fluid volume recoverable from the accumulator system between the system rated working pressure and the precharge 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
Spent Fluid

Spent Fluid

Definition(s)

Spent Fluid

Hydraulic control fluid that is vented from a function control port when the opposite function is operated. 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
Solenoid Valve

Solenoid Valve

Definition(s)

Solenoid Valve

An electrical coil operated valve which controls a hydraulic or pneumatic function or signal. 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
Sheave

Sheave

Definition(s)

Sheave

A wheel or rollers with a cross-section designed to allow a specific size of rope, cable, wire line or hose bundle to be routed around it at a fixed bend radius that is normally used to change the direction of, and support, the line. 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
Shear Ram BOP (Blind/Shear Rams)

Shear Ram BOP (Blind/Shear Rams)

Definition(s)

Shear Ram BOP (Blind/Shear Rams)

Rams having cutting blades that will shear tubulars that may be in the wellbore. Shearing blind rams additionally close and seal against the pressure below. Casing shear rams are designed specifically to shear casing, and may not seal the well bore. 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
Shared

Shared

Definition(s)

Shared

An element or system that may be used for more than one 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
Selector Valve

Selector Valve

Definition(s)

Selector Valve

A three position directional control valve that has the inlet port blocked and the operator ports blocked in the center position. 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
Riser Connector (LMRP Connector)

Riser Connector (LMRP Connector)

Definition(s)

Riser Connector (LMRP Connector)

A hydraulically operated connector that joins the LMRP to the top of the lower BOP stack. 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
Rigid Conduit

Rigid Conduit

Definition(s)

Rigid Conduit

Hydraulic conduit. 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
Return-To-Reservoir Circuit

Return-To-Reservoir Circuit

Definition(s)

Return-To-Reservoir Circuit

A hydraulic control circuit in which spent fluid is returned to the reservoir. 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
Retrievable Control Pod

Retrievable Control Pod

Definition(s)

Retrievable Control Pod

A subsea pod that may be run or retrieved remotely using a wire line, drill pipe, or other means, without retrieval of the LMRP or BOP stack. 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
Remote Panel

Remote Panel

Definition(s)

Remote Panel

See control panel. 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