Rocks & mirror
Encyclopedia of Marine and Energy Technology



The provision of equipment or components which are surplus to operational requirements in order to continue operation after a failure. Redundancy can be achieved by installation of multiple components, systems or alternative means of performing the same function.

Level of redundancy – The classification of mechanical, electrical and spatial separation and also the independence of the systems required for propulsion and steering. The redundant propulsion power of the propulsion system is denoted by the additional index x%. Example: The additional index 40 % means that following a failure of one of the redundant propulsion systems, at least 40 % of the main propulsion power will still be available.