Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Regulator (Pressure)
Definition(s)
Regulator (Pressure)
A hydraulic device that reduces upstream supply pressure to a desired (regulated) pressure. Note: It may be manually or remotely operated and, once set, should maintain the regulated output pressure unless reset to a different 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 StandardsReel (Hose or Cable)
Definition(s)
Reel (Hose or Cable)
A reel, usually power driven, that stores, pays-out and takes-up umbilicals, either control hose bundles or electrical cables. 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 StandardsReadback
Definition(s)
Readback
An indication of a remote condition. 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 StandardsReaction Time
Definition(s)
Reaction Time
The actual time elapsed between initiation of a command to completion of the 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 StandardsRapid Discharge Accumulators
Definition(s)
Rapid Discharge Accumulators
Accumulators required to satisfy their functional fluid demand in less than 3 min. This includes dedicated shear (both surface and subsea), dead man systems, autoshear accumulators, some acoustic and special purpose accumulators. 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 StandardsRam BOP
Definition(s)
Ram BOP
Blowout preventer that uses metal blocks assembled with elastomer seals to seal off pressure on a wellbore with or without tubulars in the bore.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsRam BOP
A blowout preventer that uses rams to seal off pressure in 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 StandardsQualification Test
Definition(s)
Qualification Test
A one-time (prototype) test program performed on a newly designed or significantly redesigned control system or component to validate conformance with design specifications. 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 StandardsPressure Biased Control System
Definition(s)
Pressure Biased Control System
A discrete hydraulic control system utilizing a means to maintain an elevated pressure level (less than control valve actuation pressure) on pilot lines such that hydraulic signal transmission time is reduced. 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 StandardsPrecharge
Definition(s)
Precharge
See accumulator precharge. 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 StandardsPower Fluid
Definition(s)
Power Fluid
Pressurized fluid dedicated to the direct operation of 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 StandardsPotable Water
Definition(s)
Potable Water
Water that is fit to drink.- Note: 1 to entry: In most developed countries, water supplied to commerce and industry is fit to drink even though a small amount is actually consumed or used in food preparation.