Unreliable component causes an undesired event
- DP Event
- Published on 25 February 2020
- Generated on 14 August 2025
- DPE 01/20
- 1 minute read
Undesired event
Though redundancy is a must in DP 2/3 designs, component quality may impact the likelihood of such DP events occurring.
Comments
Investigation found that a 24v bridge rectifier supplying voltage to the main generator switchboard breakers one and two had burned out.
The age and quality of the rectifier was thought to be the main reason for failure. Planned maintenance routines were updated and shared with the fleet. It was recognised that the system was vulnerable due to a single 24v bridge rectifier supplying the entire port switchboard.
Considerations
The vessel validated that it could maintain position following the worst-case failure of a complete switchboard. Though redundancy is a must in DP 2/3 designs, component quality may impact the likelihood of such DP events occurring.
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