Video: Dynamic Positioning Equipment Redundancy.Class requirements Based on IMO - International Maritime Organization publication 645 the Classification Societies have issued rules for dynamically positioned ships described as Class 1, Class 2 and Class 3.
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Equipment Class 1 has no redundancy. Loss of position may occur in the event of a single fault
Equipment Class 2 is required to have redundancy so that no single fault in an active system will cause the system to fail. Loss of position should not occur from a single fault of an active component or system such as generators, thruster, switchboards, remote controlled valves etc. But may occur after failure of a static component such as cables, pipes, manual valves or as a result of flood or fire.
Equipment Class 3 which also has to withstand fire or flood in any one compartment without the system failing. Loss of position should not occur from any single failure including a completely burnt fire sub division or flooded watertight compartment. Therefore in addition to the requirements of Class 2 to comply with Class 3 requirements for redundancy a DP Vessel is required to have a fully remote DP system isolated from the main duplex or triplex system by a Class A 60 Bulkhead
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DP Equipment Redundancy Requirements IMO