Alerts iconVessel collision with wind turbine – MSF safety alert 20-01

What happened? After a transfer of 4 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 … Continue reading “Vessel collision with wind turbine – MSF safety alert 20-01”

Alerts iconSteering motor failure leads to loss of both aft thrusters – DP incident

Case narrative A DP2 cargo vessel was working close to a pipelaying vessel conducting cargo operations in a drift off position.  The current at the time of the event was 2.5 knots which, in conjunction with 10 knots of wind, resulted in an external force of 30 tons acting on the port quarter. The port … Continue reading “Steering motor failure leads to loss of both aft thrusters – DP incident”

Alerts iconUnreliable position reference systems leads to DP incident

Comments from the report Only 2 DGNSS were online, with poor signal quality due to the location and environmental conditions.  The end effect was that the deviation from the set point in surge and sway were increasing for each oscillation. Considerations of the IMCA Marine DP Committee from the above event For DP2 operations, the … Continue reading “Unreliable position reference systems leads to DP incident”

Alerts iconDP3 drillship switchboard blacked out – DP undesired event

Case Narrative: A DP 3 6th generation drillship was set up on automatic DP engaged in plug and abandonment operations in field.  The DP design concept of the vessel was such that there were two redundant groups and the vessel was set up with power generation and thruster supplies equally split across each redundant group … Continue reading “DP3 drillship switchboard blacked out – DP undesired event”

Alerts iconMix of absolute and relative position reference systems – DP incident

Comments from the Report: It was considered that the movement towards the drill ship could have been caused by a combination of position reference system degradation and interaction from the Drill ship’s thrusters.  There was an advisory regarding service disruption from the DGNSS supplier in force at the time.  It was stated that the DPO … Continue reading “Mix of absolute and relative position reference systems – DP incident”