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DP trial leads to partial blackout – DP undesired event

Comments:

It was discovered that the 230v supply breaker was open and the uninterruptible power supply (UPS) 2 batteries completely discharged.  Warning alarms generated by the DP system regarding the condition of UPS 2 were overlooked.  An additional checklist item was added to the field arrival trials to check UPS 1, 2 and 3 are clear of alarms and operating as normal.  Vessel maintained position throughout.

Considerations from the above event:

  • The lessons to be learnt from the above are obvious and barriers preventing such errors are essential;
  • Alarms presented to operators must be acknowledged and acted on.

DP Event

Published: 29 November 2016
Download: IMCA DPE 04/16

Classification:
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The following case studies and observations have been compiled from information received by IMCA. All vessel, client, and operational data has been removed from the narrative to ensure anonymity.

Case studies are not intended as guidance on the safe conduct of operations, but rather to assist vessel managers, DP operators and DP technical crew in appropriately determining how to safely conduct their own operations. Any queries should be directed to IMCA at dpreports@imca-int.com. Members and non-members alike are welcome to contact IMCA if they have experienced DP events which can be shared anonymously with the DP industry.

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