Comments from the report:
During cargo operations in DP assisted mooring, due to undefined information being fed to the DP system, the pitch on the port propeller increased to maximum. The vessel started to drive off the installation with the crane connected to the load, dimensions 3.5*10.5*6.5 m weighing 11 M Tons. All deck crew were already in safety area behind crash bar ready with tug lines for the lift.
Considerations of the IMCA Marine DP Committee from the above event:
- There appears to be no consideration to the external force being applied to the vessel due to the use of mooring lines when in DP;
- If an external force is applied to a DP vessel without feedback and correct configuration within the DP system, it will have unintended consequences;
- It appears an appropriate Activity Specific Operating Guideline (ASOG) was not in use.
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 email@example.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.
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.