Comments from the report:
The vessel reported that they had changed these modules in the past whilst on DP without any issues. The risk assessment had identified that the consequence would not lead to loss of equipment greater than worst case and proceeded due to the status of the vessel operations, open water and not connected to the seabed.
Considerations of the IMCA Marine DP Committee from the above event:
- Incident validates the redundant capability of the vessel, but also potentially highlights a hidden failure leading to generator 2 failure;
- The report did not identify the root cause for the loss of equipment whilst replacing the RMP module, a successful online activity undertaken previously;
- This event highlights the benefit of considering mission equipment during risk assessments;
- It also event highlights that expected results of repairs are not always guaranteed;
- As far as is possible, maintenance or replacement of critical DP equipment should not be done while conducting DP operations;
- In this instance, it would have been prudent for ROVs to return to their TMS and the crane made safe prior to undertaking the work.
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 firstname.lastname@example.org. 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.
IMCA’s store terms and conditions (https://www.imca-int.com/legal-notices/terms/) apply to all downloads from IMCA’s website, including this document.
IMCA makes every effort to ensure the accuracy and reliability of the data contained in the documents it publishes, but IMCA shall not be liable for any guidance and/or recommendation and/or statement herein contained. The information contained in this document does not fulfil or replace any individual’s or Member's legal, regulatory or other duties or obligations in respect of their operations. Individuals and Members remain solely responsible for the safe, lawful and proper conduct of their operations.