Device, Sealed

Device, Sealed

Definition(s)

Device, Sealed

A device so constructed that it cannot be opened during normal operational conditions or operational maintenance and is sealed to restrict entry of an external atmosphere. Such devices may be incorporated into equipment having the type of protection referred to as “nC.

Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards
Device, High-Temperature

Device, High-Temperature

Definition(s)

Device, High-Temperature

A device whose maximum operating temperature exceeds 80 % of the autoignition temperature in degrees Celsius (°C) of all the gas or vapor involved see 4.2.

Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards
Device, Hermetically Sealed

Device, Hermetically Sealed

Definition(s)

Device, Hermetically Sealed

Equipment sealed against the entrance of an external atmosphere where the seal is made by fusion, for example, soldering, brazing, welding, or the fusion of glass to metal.

Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards
Device, Arcing

Device, Arcing

Definition(s)

Device, Arcing

A device that, during its normal operation, produces an arc with sufficient energy to cause ignition of an ignitable mixture.

Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards
Deadlegs

Deadlegs

Definition(s)

Deadlegs

Components of a piping system that normally have little or no significant flow. Some examples include blanked (blinded) branches, lines with normally closed block valves, lines with one end blanked, pressurized dummy support legs, stagnant control valve bypass piping, spare pump piping, level bridles, pressure relieving device inlet and outlet header piping, pump trim bypass lines, high-point vents, sample points, drains, bleeders, and instrument connections. Deadlegs also include piping that is no longer in use but still connected to the process.

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 Standards
Damage Rate

Damage Rate

Definition(s)

Damage Rate

The rate of deterioration other than corrosion, i.e. rate of cracking, rate of HTHA, creep rate, etc.

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 Standards
Damage Mechanism

Damage Mechanism

Definition(s)

Damage Mechanism

Any type of deterioration encountered in the refining and chemical process industry that can result in flaws/defects that can affect the integrity of vessels (e.g. corrosion, cracking, erosion, dents, and other mechanical, physical, or chemical impacts). See API 571 for a comprehensive list and description of damage mechanisms.

Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards  

Damage Mechanism

Any type of deterioration encountered in the refining and chemical process industry that can result in metal loss/flaws/ defects that can affect the integrity of piping systems (e.g. corrosion; cracking; erosion; dents; and other mechanical, physical, or chemical impacts). See API 571 for a comprehensive list and description of damage mechanisms that may affect process piping systems in the refining, petrochemical and chemical process industries.

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 Standards
Dynamic Mechanical Thermal Analysis

Dynamic Mechanical Thermal Analysis

Definition(s)

Dynamic Mechanical Thermal Analysis

Method for determining the glass transition temperature of a polymer orGRP (3.2.44) component. 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
Differential Scanning Calorimetry

Differential Scanning Calorimetry

Definition(s)

Differential Scanning Calorimetry

Method for determining the glass transition temperature of a polymer. 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
DMTA

DMTA

Definition(s)

DMTA

Dynamic mechanical thermal analysis. 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  

DMTA

Method for determining the glass transition temperature of a polymer orGRP (3.2.44) component. 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
DLT

DLT

Definition(s)

DLT

Design life time.

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
Design External Pressure

Design External Pressure

Definition(s)

Design External Pressure

Maximum positive external pressure differential, i.e. external minus internal pressure, intended to be experienced by a component during its service life. 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
Design Envelope

Design Envelope

Definition(s)

Design Envelope

Long-term envelope reduced by the part factor f2 and the partial factors A0, A2 and A3. 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
Density of Heat Flow Rate

Density of Heat Flow Rate

Definition(s)

Density of Heat Flow Rate

Quantity of heat divided by area and time. 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
Delamination

Delamination

Definition(s)

Delamination

Separation of two adjacent plies or layers of material in a laminate resulting from lack of adhesion.
  • Note: 1 to entry: Delamination occur either locally or covering a wide area.
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
Drill Floor Clearance

Drill 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 Standards
Drilling Equipment Set

Drilling 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.
Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global Standards
DP System

DP 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 Guidance  

DP 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:
  1. power system;
  2. thruster system; and
  3. DP 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 Guidance
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 Guidance  

DP 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:
  1. computer system/joystick system;
  2. sensor system(s);
  3. control stations and display system (operator panels);
  4. position reference system(s);
  5. associated cabling and cable routeing; and
  6. networks
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
DP Vessel

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 Guidance  

DP 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 Guidance
DPVAD

DPVAD

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 Guidance  

DPVAD

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 Guidance
DP Operation

DP 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 Guidance  

DP 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 Guidance
DP Control Station

DP 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 Guidance
Dynamic Positioning Control System (DP control system)

Dynamic Positioning Control System (DP control system)

Definition(s)

Dynamic Positioning Control System (DP control system)

Comprises 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 routing
  • networks
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance  

Dynamic Positioning Control System (DP 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:
  1. computer system/joystick system;
  2. sensor system(s);
  3. control stations and display system (operator panels);
  4. position reference system(s);
  5. associated cabling and cable routeing; and
  6. networks.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
Dynamically Positioned Vessel (DP vessel)

Dynamically Positioned Vessel (DP vessel)

Definition(s)

Dynamically Positioned Vessel (DP Vessel)

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 Guidance  

Dynamically Positioned 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 Guidance
Dynamic Positioning Verification Acceptance Document (DPVAD)

Dynamic Positioning Verification Acceptance Document (DPVAD)

Definition(s)

Dynamic Positioning Verification Acceptance Document (DPVAD)

The document issued by the Administration or its Recognized Organization to a DP vessel complying with these Guidelines. (See appendix for model form.). Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance  

Dynamic Positioning Verification Acceptance Document (DPVAD)

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 Guidance
Dynamic Positioning Operation (DP operation)

Dynamic Positioning Operation (DP operation)

Definition(s)

Dynamic Positioning Operation (DP operation)

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 Guidance  

Dynamic Positioning 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 Guidance
Dynamic Positioning Control Station (DP control station)

Dynamic Positioning Control Station (DP control station)

Definition(s)

Dynamic Positioning Control Station (DP control station)

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 Guidance  

Dynamic Positioning 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 Guidance
D&W

D&W

Definition(s)

D&W

Drilling & Well. Source: Norwegian Oil and Gas Association, Guideline No. 135, Recommended Guidelines for Classification and categorization of well control incidents and well integrity incidents, Rev. 4, 27 June 2017, National or Regional Standards
DNV GL certificate (VL)

DNV GL certificate (VL)

Definition(s)

DNV GL certificate (VL)

A product or material certificate validated and signed by a surveyor from DNV GL will be denoted a VL certificate (see DNVGL-RU-SHIP Pt.1 Ch.3 Sec.5). Source: Offshore Gangways, DNVGL-ST-0358, DNV GL, September 2017. Global Standards