DP emergency drill scenarios are included to assist crew members conduct DP drills on-board. The intent is that the template can be used on any DP vessel so specific details regarding the technical outcome are not included. The benefit from using this template is to monitor and learn from the human reactions of key DP … Continue reading “DP emergency drill scenario”

Case narrative: A DP2 Semi-submersible mobile offshore drilling unit (MODU) was working in field preparing for drilling operations on location. The environmental conditions at the time were benign. Cargo operations were ongoing with a DP2 platform supply vessel alongside. The vessel experienced a total loss of all online thrusters leading to the MODU starting to … Continue reading “DP2 semi-submersible MODU DP incident”

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 … Continue reading “DP incident with assisted mooring”

Comments from the report: The two meters move command was given in two one-meter steps to the DP system by the operator with a time lapse of a few seconds. This was investigated by the DP system vendor and was identified as a software glitch. Two consecutive incremental move commands before the window screen has … Continue reading “DP incident caused by software glitch”

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”

Comments from the report: Investigation found that a 24v bridge rectifier supplying voltage to the main generator switchboard breakers 1 and 2 had burned out.  The age and quality of the rectifier was thought to be the main reason for failure.  Planned maintenance routines were updated and shared with the fleet.  It was recognised that … Continue reading “Unreliable component causes a DP undesired event”

Comments from the report: The vessel had been on DP for the whole day and in order to lift the ROV on deck with the crane, vessel heading had to be changed 15 degrees away from the wind.  This caused a high load on two running bow thrusters and the third bow thruster was started, … Continue reading “Change of heading leads to DP incident”

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 … Continue reading “DP undesired event due to online maintenance work”

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”

Comments from the report Whilst pressurising the fire main for helicopter operations, a gasket failure occurred on the pipework valve under the engine room floor in front of transformers 690V/440V T3 and T4.  The spray created a water fog and favourable atmosphere for an electric arc on T3 and T4 transformers, leading to a loss … Continue reading “Pipe leak leads to loss of all thrusters – DP incident”