Vessel collision with wind turbine

After a transfer of four technicians to a wind turbine, the vessel was positioned just outside the 200-meter exclusion zone for standby. The next task was to pick up the same technicians when they had completed the work they had planned.

The OOW moved the vessel from the turbine to outside exclusion zone in DP surge mode. Just outside the exclusion zone, the vessel was turned to have stern on the weather, vessel was then in a ‘drift on’ position. On completion of turn, the OOW activated auto DP by ‘double tapping’ the auto DP button, but not confirming that the vessel indeed was in full auto DP before leaving the DP desk to deal with other duties. The OOW was at the time alone on the bridge. The Vessel was still in DP surge mode and by the help of the current, the vessel drifted towards the wind turbine and made contact just six minutes later. The vessel had a speed of 1.1 knots at the time of contact.

The vessel hit the wind turbine with the helideck perimeter netting and the bridge wing on port side of the vessel. The incident did not result in any personal injuries, and only minor damage to turbine, and vessel. No technical issues were identified during the investigation of this incident.

• OOW failed to comply with procedures and industry guidelines.
• OOW did not confirm that full auto DP was activated after double tap of the button on joystick.
• OOW was alone on bridge.
• OOW decided to deal with some administrative task while alone on bridge.
• Vessel placed in a drift on position.

• The incident raises a concern regarding the robustness of the double push method of confirmation.
• After requesting an action, an operator should always confirm it by remaining situationally aware.
• Bridge manning levels should be in accordance with Guidelines for the Design and Operation of DP Vessels (IMCA M103), section 3.8.
• Personnel in the report are referred to as Officer of the Watch (OOW) and not DP Operators (DPO). Key DP personnel should have training and experience in accordance with Guidance for the Training & Experience of Key DP Personnel (IMCA M117).

View the full safety alert from the Marine Safety Forum.