Definition(s)
Redundancy
The ability of a component or system to maintain or restore its function when a single failure has occurred. Redundancy can be achieved, for instance, by the installation of multiple components, systems or alternative means of performing a function.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
Redundancy
Redundancy means the ability of a component or system to maintain or restore its function when a single failure has occurred. Redundancy can be achieved, for instance, by the installation of multiple components, systems or alternative means of performing a function.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
Redundancy
Ability of a component or system to maintain its function when one failure has occurred. Redundancy can be achieved, for instance, by installation of multiple components, systems or alternative means of performing a function.
Source: Offshore Gangways, DNVGL-ST-0358, DNV GL, September 2017. Global Standards
Redundancy
Additional or alternative systems, sub-systems, assets, or processes that maintain a degree of overall functionality in case of loss or failure of another system, sub-system, asset, or process.
From: DHS Risk Lexicon.
Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global Standards
Redundancy
The availability of alternate load paths in a platform following the failure of one or more structural components.
Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Redundancy
Existence of more than one means for performing a required function
- Note: 1 to entry: The aim of redundancy is to provide backup in case of one or several failures of the means
performing a required function.
- Note: 2 to entry: Redundancy definitions for passive (cold) standby, active (hot) standby and mixed are given in
ISO 14224[15], C.1.2.
- Note: 3 to entry: Redundancy is sometimes (in IEC 61508[2] and IEC 61511[3]) called “fault tolerance”.
[SOURCE: ISO 14224]
Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards
Redundancy
The ability of a component or system to maintain or restore its function when a failure of a member or connection has occurred. Redundancy may be achieved for instance by strengthening or introducing alternative load paths.
Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards
Redundancy
Additional or alternative systems, sub-systems, assets, or processes that maintain a degree of overall functionality in case of loss or failure of another system, sub-system, asset, or process
Sample Usage: A lack of redundancy in access control mechanisms is a vulnerability that can result in a higher likelihood of a successful attack.
Source: DHS Risk Lexicon, U.S. Department of Homeland Security, 2010 Edition. September 2010 Regulatory Guidance
Redundancy
Existence of more than one means for performing a required function.
Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global Standards
Redundancy
Existence of more than one means for performing a required function of an item. NOTE For more detailed definitions and interpretations, see C.1.2.
Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards
Redundancy
Ability of a structure to find alternative load paths following failure of one or more non-critical components, thus limiting the consequences of such failures.
- NOTE: All structures having redundancy are statically indeterminate. [ISO 19902:2007, definition 3.39].
Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards