Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Installer
Definition(s)
Installer
Party which carries out all or part of the construction and commissioning of composite piping installations and installation work for a project. 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 StandardsAuthority Having Jurisdiction
Definition(s)
Authority Having Jurisdiction
Third-party organization required to be satisfied with the standard of engineering proficiency and safety of a project- EXAMPLE: A classification society, verification body or government regulatory body.
Well Slot
Definition(s)
Well Slot
Opening provided for individual wells that allows a path from the underside of the drilling equipment set to the seabed- Note: 1 to entry: In general lateral supports are provided below each well slot from the platform structure through the topsides and through the water column to support the well tubular to withstand environmental forces and prevent excessive stress and displacements.
Well Logging Module
Definition(s)
Well Logging Module
Modularized facilities that include well logging winch, well logging room, wellhead lubricator and cable, used to provide well logging services. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsSkidding System
Definition(s)
Skidding System
Equipment that can include the skid rails, skid shoe, fwd/aft skidding claws, skidding cylinders, locking claws, skidding hydraulic power unit (HPU), locking and control unit, used for horizontal movement of the DES, covering the well slot area.- Note: 1 to entry: Alternative rig skidding systems can be used as well.
Skid Rail
Definition(s)
Skid Rail
Structural steelwork that provides smooth flat surfaces for the drilling equipment set to move in an X-Y planes to allow access over all well slots- Note: 1 to entry: The upper skid rail is the slide skid rail of the upper substructure of the drilling rig; the lower skid rail is that of the lower substructure.
Powder Tank Module
Definition(s)
Powder Tank Module
Modularized facilities that include bentonite tank, barite tank, cement tank, weighing equipment, control equipment, and manifold system, used to store powder materials for drilling fluid and cement slurry preparation. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsP-tank
Definition(s)
P-tank
Powder tank module. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsP-tank
Modularized facilities that include bentonite tank, barite tank, cement tank, weighing equipment, control equipment, and manifold system, used to store powder materials for drilling fluid and cement slurry preparation. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsMud Logging Module
Definition(s)
Mud Logging Module
Modularized facilities that include mud logging room, data acquisition system and display terminal, used to provide mud logging services. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsModular Drilling Rig
Definition(s)
Modular Drilling Rig
Modularized facilities for drilling from a fixed offshore platform consisting of drilling equipment set, drilling support, P-tank, cementing, well logging, mud logging and other equipment. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsMDR
Definition(s)
MDR
Modular Drilling Rig. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsMDR
Manufacturer's data reports. Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global StandardsMDR
Modularized facilities for drilling from a fixed offshore platform consisting of drilling equipment set, drilling support, P-tank, cementing, well logging, mud logging and other equipment. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsDrill Floor Clearance
Definition(s)
Drill Floor Clearance
Clear distance between the bottom of the rotary table support beam and the BOP deck of the platform. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsDrilling Equipment Set
Definition(s)
Drilling Equipment Set
Set of equipment that includes derrick/mast, substructure, drawworks, crown block, traveling block, hook, TDS, rotary table, BOP, driller’s cabin, drill floor equipment, choke and kill manifold and can also include shale shakers, degasser, desander, desilter, centrifuge, cuttings dryer, pipe handling system and BOP handling system etc., used to implement hoisting and rotating functions during drilling operations.- Note: 1 to entry: The drilling equipment set is generally movable by means of skid rails such that the centre can be positioned over one of a number of well slots.
Cementing Module
Definition(s)
Cementing Module
Modularized facilities that include cementing pump, mixing device and manifold system, used to provide cementing services. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsWCF
Definition(s)
WCF
Worst-Case Failure. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceWCF
Worst-Case Failure (WCF) means the identified single fault in the DP system resulting in maximum detrimental effect on DP capability as determined through the FMEA. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceWCFDI
Definition(s)
WCFDI
Worst-Case Failure Design Intent (WCFDI) means the specified minimum DP system capabilities to be maintained following the worst-case failure. The worst-case failure design intent is used as the basis of the design. This usually relates to the number of thrusters and generators that can simultaneously fail.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDP System
Definition(s)
DP System
Dynamic Positioning system. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDP System
Dynamic Positioning system (DP system) means the complete installation necessary for dynamically positioning a vessel comprising, but not limited to, the following sub-systems:- power system;
- thruster system; and
- DP control system.
DP Control System
Definition(s)
DP Control System
Dynamic Positioning control system. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDP Control System
Dynamic Positioning control system (DP control system) means all control components and systems, hardware and software necessary to dynamically position the vessel. The DP control system consists of the following:- computer system/joystick system;
- sensor system(s);
- control stations and display system (operator panels);
- position reference system(s);
- associated cabling and cable routeing; and
- networks
DP Vessel
Definition(s)
DP Vessel
Dynamically positioned vessel (DP vessel). Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDP Vessel
Dynamically positioned vessel (DP vessel) means a unit or a vessel which automatically maintains its position and/or heading (fixed location, relative location or predetermined track) by means of thruster force. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDPVAD
Definition(s)
DPVAD
Dynamic Positioning Verification Acceptance Document. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDPVAD
Dynamic Positioning Verification Acceptance Document (DPVAD) means the document issued by the Administration or its Recognized Organization to a DP vessel complying with these Guidelines. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDP Operation
Definition(s)
DP Operation
Dynamic Positioning Operation. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDP Operation
Dynamic Positioning operation (DP operation) means using the DP system to control at least two degrees of freedom in the horizontal plane automatically. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceDP Control Station
Definition(s)
DP Control Station
Dynamic Positioning control station (DP control station) means a workstation designated for DP operations, where necessary information sources, such as indicators, displays, alarm panels, control panels and internal communication systems are installed (this includes: DP control and independent joystick control operator stations, required position reference systems' Human Machine Interface (HMI), manual thruster levers, mode change systems, thruster emergency stops, internal communications). Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceASOG
Definition(s)
ASOG
Activity-Specific Operating Guidelines. Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceActivity-Specific Operating Guidelines (ASOG)
Definition(s)
Activity-Specific Operating Guidelines (ASOG)
Guidelines on the operational, environmental and equipment performance limits for the location and specific activity.(For drilling operations, the ASOG may be known as the Well-Specific Operating Guidelines(WSOG)). Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceActivity-Specific Operating Guidelines (ASOG)
Activity-Specific Operating Guidelines (ASOG) means guidelines on the operational, environmental and equipment performance limits for the location and specific activity. (For drilling operations, the ASOG may be known as the Well-Specific Operating Guidelines (WSOG)). Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceWorst-Case Failure Design Intent (WCFDI)
Definition(s)
Worst-Case Failure Design Intent (WCFDI)
The specified minimum DP system capabilities to be maintained following the worst-case failure. The worst-case failure design intent is used as the basis of the design. This usually relates to the number of thrusters and generators that can simultaneously fail.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceWorst-Case Failure Design Intent (WCFDI)
Worst-Case Failure Design Intent (WCFDI) means the specified minimum DP system capabilities to be maintained following the worst-case failure. The worst-case failure design intent is used as the basis of the design. This usually relates to the number of thrusters and generators that can simultaneously fail.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceThruster System
Definition(s)
Thruster System
All components and systems necessary to supply the DP system with thrust force and direction. The thruster system includes:- thrusters with drive units and necessary auxiliary systems including piping, cooling, hydraulic, and lubrication systems, etc.
- main propellers and rudders if these are under the control of the DP system
- thruster control system(s)
- manual thruster controls
- associated cabling and cable routing.
Thruster System
Thruster system means all components and systems necessary to supply the DP system with thrust force and direction. The thruster system includes:- thrusters with drive units and necessary auxiliary systems including piping, cooling, hydraulic, and lubrication systems, etc.;
- main propellers and rudders if these are under the control of the DP system;
- thruster control system(s);
- manual thruster controls; and
- associated cabling and cable routeing.
Time to Safely Terminate (operations)
Definition(s)
Time to Safely Terminate (operations)
The amount of time required in an emergency to safely cease operations of the DP vessel.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidanceTime to Safely Terminate (operations)
Time to safely terminate (operations) means the amount of time required in an emergency to safely cease operations of the DP vessel.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidancePower Management System
Definition(s)
Power Management System
A system that ensures continuity of electrical supply under all operating conditions.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory GuidancePower Management System
Power management system means a system that ensures continuity of electrical supply under all operating conditions.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance