Dynamic Positioning Class Requirements IMO 645
.MO DP Classification Class requirement as required by IMO 645.
IMO DP Classification 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.
Each vessel will be designated an appropriate notation by its classification societies. Each Classification Society will have there own notations and these notations are at least equivalent to the IMO requirements
Equipment Class 1 has no redundancy. Loss of position may occur in the event of a single fault
Equipment Class 2 has 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 etc.
To achieve Class 2 Redundancy it requires two computers and controllers on dual networks one active controlling and the other passive and monitoring. Also required are 3 PRS 3 Gyro 3 MRU and Two wind sensors
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 Two 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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IMO DP Classification Class Rules