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Thruster entanglement during shuttle tanker operations


Operations were conducted according to procedures. It was concluded that the procedures for this operation needed to be modified to limit the amount of rope in the water to prevent bow thruster entanglement.

Considerations from the above event:

  • Operations were being conducted within limits that allowed for disconnection to be completed in a controlled manner using the redundancy of thrusters.
  • All vessel types are reminded to review procedures that might affect DP operations, particularly those covering downlines, hoses, ropes, etc.

DP Event

Published: 13 September 2016
Download: IMCA DPE 03/16

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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 [email protected]. 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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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.