FSO

FSO

Definition(s)

FSO

Facility Security Officer.

Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global Standards

FSO

Floating storage and offloading structure. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  
FLS

FLS

Definition(s)

FLS

Fatigue limit state. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards Source: Verification of Lifting Appliances for the Oil and Gas Industry, DNV-OSS-308, October 2010, Det Norske Veritas AS, Global Standards
CALM

CALM

Definition(s)

CALM

Catenary anchor leg mooring. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  
ALS

ALS

Definition(s)

ALS

Accidental limit state. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards  

ALS

Accidental limit states. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Weathervaning

Weathervaning

Definition(s)

Weathervaning

Process by which a floating structure passively varies its heading in response to time-varying environmental actions. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Thruster-Assisted Mooring

Thruster-Assisted Mooring

Definition(s)

Thruster-Assisted Mooring

Stationkeeping system consisting of mooring lines and thrusters. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Taut-Line Mooring

Taut-Line Mooring

Definition(s)

Taut-line Mooring

Mooring system where the restoring action is provided by elastic deformation of mooring lines. [ISO 19900:2002]. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards
Structural Component

Structural Component

Definition(s)

Structural Component

Physically distinguishable part of a structure. [ISO 19900:2002]. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards  

Structural Component, Component

Physically distinguishable part of a member cross-section of uniform yield strength. NOTE The cross-section of a non-tubular member is usually comprised of several structural components. A component consists of only one material. Where a plate component is reinforced by another piece of plating, the reinforcement can be of a different yield strength. See also further discussion in A.12.1.1. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards  

Structural Component, Member

Physically distinguishable part of a braced structure connecting two joints. NOTE 1 A structural member can also be defined as the leg of a non-truss leg jack-up. NOTE 2 See also further discussion in A.12.1.1. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards  

Structural Component, Structural Member

Physically distinguishable part of a braced structure connecting two joints. NOTE 1 A structural member can also be defined as the leg of a non-truss leg jack-up. NOTE 2 See also further discussion in A.12.1.1. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards  
Spread Mooring

Spread Mooring

Definition(s)

Spread Mooring

Mooring system consisting of multiple mooring lines terminated at different locations on a floating structure, and extending outwards, providing an almost constant structure heading. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  

Spread Mooring

A multi-line mooring system designed to maintain an offshore unit on an approximately fixed heading. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 3, Functional Unit Types and Special Features, June 2013, Lloyd’s Register, Global Standards
Spar Platform

Spar Platform

Definition(s)

Spar Platform

Deep-draught, small water-plane area floating structure. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Ship-Shaped Structure

Ship-Shaped Structure

Definition(s)

Ship-Shaped Structure

Monohull floating structure having a geometry similar to that of ocean-going ships. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Single Point Mooring

Single Point Mooring

Definition(s)

Single Point Mooring

Mooring system that allows the floating structure to which it is connected to vary its heading (weathervane). EXAMPLE One example of a single point mooring is a turret mooring system where a number of mooring lines are attached to a turret, which includes bearings to allow the structure to rotate. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Significant Value

Significant Value

Definition(s)

Significant Value

Statistical measure of a zero-mean random variable equal to twice the standard deviation of the variable. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Semi-Submersible

Semi-Submersible

Definition(s)

Semi-Submersible

A floating offshore drilling vessel which is ballasted at the drilling location and conducts drilling operations in a stable, partly submerged position. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards  

Semi-Submersible

Floating structure normally consisting of a deck structure with a number of widely spaced, large cross-section, supporting columns connected to submerged pontoons. NOTE Pontoon/column geometry is usually chosen to minimize global motions in a broad range of wave frequencies. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  
RCS

RCS

Definition(s)

RCS

Member of the International Association of Classification Societies (IACS), with recognized relevant competence and expertise of petroleum and natural gas activities, and with established rules and procedures for classification/certification of installations in the petroleum and natural gas industries. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global Standards  

RCS

A classification society being a member of the International Association of Classification Societies (IACS), with recognized and relevant competence and experience from the synthetic fiber rope activities, and established rules/guidelines for design, manufacturing and testing of synthetic fiber ropes for use in the classification/certification activities.

Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards

RCS

Recognized classification society Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards

RCS

Member of the international association of classification societies (IACS), with recognized and relevant competence and experience in floating structures, and with established rules and procedures for classification/certification of installations used in petroleum-related activities. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  

RCS

Member of the international association of classification societies (IACS), with recognized and relevant competence and experience in jack-ups, and with established rules and procedures for classification/certification of such installations used in petroleum-related activities. NOTE Adapted from ISO 19901-7:2005, definition 3.23. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards
Recognized Classification Society

Recognized Classification Society

Definition(s)

Recognized Classification Society

Member of the International Association of Classification Societies (IACS), with recognized relevant competence and expertise of petroleum and natural gas activities, and with established rules and procedures for classification/certification of installations in the petroleum and natural gas industries. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global Standards  

Recognized Classification Society

A classification society being a member of the International Association of Classification Societies (IACS), with recognized and relevant competence and experience from the synthetic fiber rope activities, and established rules/guidelines for design, manufacturing and testing of synthetic fiber ropes for use in the classification/certification activities.

Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards

Recognized Classification Society

Member of the international association of classification societies (IACS), with recognized and relevant competence and experience in floating structures, and with established rules and procedures for classification/certification of installations used in petroleum-related activities. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  

Recognized Classification Society

Member of the international association of classification societies (IACS), with recognized and relevant competence and experience in jack-ups, and with established rules and procedures for classification/certification of such installations used in petroleum-related activities.
  • NOTE: Adapted from ISO 19901-7:2005, definition 3.23.
Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards
Proximity

Proximity

Definition(s)

Proximity

Closeness in distance. NOTE 1 Mooring systems are considered to be in proximity to a surface installation (or facility) if any part of the other installation lies within a contour described by the set of offsets coinciding with each line reaching 100 % MBS in the intact or redundancy check condition, whichever is larger. NOTE 2 Mooring systems are considered to be in proximity to a sea floor installation (or facility) if any part of the other installation lies within a polygon formed by the anchor locations. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  
Permanent Mooring System

Permanent Mooring System

Definition(s)

Permanent Mooring System

Mooring system normally used to moor floating structures deployed for long-term operations, such as those for a floating production system (FPS). Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Mooring Component

Mooring Component

Definition(s)

Mooring Component

General class of component used in the mooring of floating structures. EXAMPLE Chain, steel wire rope, synthetic fibre rope, clump weight, buoy, winch/windlass, fairlead or anchor. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  
Basic Variable

Basic Variable

Definition(s)

Basic Variable

One of a specified set of variables representing physical quantities that characterize actions, environmental influences, geometrical quantities or material properties, including soil properties. [ISO 19900:2002, 2.5]. Source: API RP 2MOP, Marine Operations, Upstream Segment, First Edition, July 2010. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards  

Basic Variable

One of a specified set of variables representing physical quantities which characterize actions, environmental influences, geometrical quantities, or material properties including soil properties. [ISO 19900:2002, definition 2.5]. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards 
Barge

Barge

Definition(s)

Barge

Simple floating vessel, normally non-propelled, on which a structure is transported. Source: API RP 2MOP, Marine Operations, Upstream Segment, First Edition, July 2010. Global Standards

 

Mobile Mooring System

Mobile Mooring System

Definition(s)

Mobile Mooring System

Mooring system, generally retrievable, intended for deployment at a specific location for a short-term operation, such as those for mobile offshore units (MOUs). Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  
Minimum Breaking Strength

Minimum Breaking Strength

Definition(s)

Minimum Breaking Strength

RCS certified strength of a chain, wire rope, fibre rope or accessories. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  

Minimum Breaking Strength

The minimum break strength (MBS) is defined as the minimum single value from a series of five prototype rope assembly, including terminations, break tests.

Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards  

Minimum Breaking Strength

The minimum single value from a series of five prototype rope assembly break tests, including terminations. Source: API RP 2SM Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, Second Edition, July 2014. Global Standards Source: API RP 2SM, Design, Manufacture, Installation, and Maintenance of Synthetic Fiber Ropes for Offshore Mooring, First Edition, July 2014. Global Standards
Limit State

Limit State

Definition(s)

Limit State

State beyond which the structure no longer fulfils the relevant design criteria. [ISO 19900:2002] Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards  

Limit State

State beyond which the structure no longer fulfils the relevant assessment criteria. NOTE Adapted from ISO 19900:2002, definition 2.21. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards  

Limit State

A state beyond which the structure no longer satisfies the requirements. The followings categories of limit states are of relevance for structures: ULS = ultimate limit states; FLS = fatigue limit states; ALS = accidental limit states; SLS = serviceability limit states. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  
Ballast System

Ballast System

Definition(s)

Ballast System

System used to change the draught, stability, trim and/or heel of a structure afloat. Source: API RP 2MOP, Marine Operations, Upstream Segment, First Edition, July 2010. Global Standards

 

Floating Structure

Floating Structure

Definition(s)

Floating Structure

Structure where the full weight is supported by buoyancy. [ISO 19900:2002] NOTE The full weight includes lightship weight, mooring system pre-tension, riser pre-tension, operating weight, etc. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards
Fit-for-Purpose

Fit-for-Purpose

Definition(s)

Fit for Purpose

‘Fit for purpose’ means able to perform intended functions. Intended functions include drilling in case of drilling rigs, and top side facilities in case of production well / process  platforms. OISD guidance notes for fit for purpose certification of MODU are placed at annexure-4. Source: Guidance Notes on Petroleum and Natural Gas (Safety in Offshore Operations) Rules, 2008, Oil Industry Safety Directorate (India), 2012. Regulatory Guidance

Fit-for-Purpose

Meeting the intent of an International Standard although not meeting specific provisions of that International Standard in local areas, such that failure in these areas will not cause unacceptable risk to life-safety or the environment. [ISO 19900:2002]. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards
Fitness-for-Purpose

Fitness-for-Purpose

Definition(s)

Fitness-for-Purpose

A demonstration that an existing structure has adequate strength to resist the imposed assessment loads. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards

Fitness-for-Purpose

Meeting the intent of an International Standard although not meeting specific provisions of that International Standard in local areas, such that failure in these areas will not cause unacceptable risk to life-safety or the environment. [ISO 19900:2002]. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards
Expected Value

Expected Value

Definition(s)

Expected Value

First-order statistical moment of the probability density function for the considered variable that, in the case of a time-dependent parameter, can be associated with a specific reference period. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards  

Expected Value

The most probable value of a load during a specified time period. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  
Dynamic Action

Dynamic Action

Definition(s)

Dynamic Action

Action that induces acceleration of a structure or a structural component of a magnitude sufficient to require specific consideration. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards