Definition(s)
Hidden Failure
Hidden failure means a failure that is not immediately evident to operations or maintenance personnel and has the potential for failure of equipment to perform an on-demand function, such as protective functions in power plants and switchboards, standby equipment, backup power supplies or lack of capacity or performance.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
Hidden Failure
A failure that is not immediately evident to operations or maintenance personnel and has the potential for failure of equipment to perform an on-demand function, such as protective functions in power plants and switchboards, standby equipment, backup power supplies or lack of capacity or performance.
Source: IMO MSC.1/Circ.1580, GUIDELINES FOR VESSELS AND UNITS WITH DYNAMIC POSITIONING (DP) SYSTEMS, 16 June 2017, International Maritime Organization. Regulatory Guidance
Hidden Failure
Covert failure
Dormant failure
Unrevealed failure
Undetected failure
failure which is not immediately evident to operations and maintenance personnel
- Note: 1 to entry: Hidden failures do not show themselves when they occur. The occurrence of a hidden failure gives a latent fault which may be revealed by specific tests (e.g. periodic tests) or by the failure of the item to performi ts function when required.
- Note: 2 to entry: The repair of hidden failures cannot begin as long as they have not been detected. The unknown times spent between the failures and their detections belong to the MTTRes.
Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards
Hidden Failure
Failure that is not immediately evident to operations and maintenance personnel. NOTE Equipment that fails to perform an “on demand” function falls into this category. It is necessary that such failures be detected to be revealed.
Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. GlobalStandards