Comments from the report: It was concluded that the loss of both DGNSS were due to huge superstructure of the installation interfering with satellite signals. This phenomenon is called reflection […]
DP Event Bulletins
DP station keeping event bulletins enhance the traditional reporting and analysis of dynamic positioning station keeping events and incidents. They ensure that the industry is provided with prompt feedback, including anonymous factual case studies of events reported to IMCA.
Individual DP events are available individually online, tagged and searchable, while the traditional PDF collections are also available for download.
To be included into the subscription list for the DP Event Bulletin emails, email communications@legacy.imca-int.com
Submit a Report
All members are encouraged to contribute relevant DP information by using our reporting template which is available under Submit a Report where you will also see details on how to submit your information.
IMCA Contact
Richard Purser
Technical Adviser - Marine
Contact
DP Events
DP incident caused by human factor
Comments from the report: It is mentioned in the report that DG#4 tripped out for unknown reasons. Elsewhere in the report the cause of this incident is mentioned as complacency […]
DP2 semi-submersible MODU DP incident
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 […]
DP incident with assisted mooring
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. […]
DP incident caused by software glitch
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. […]
Vessel 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 […]
Change of heading leads to DP incident
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 […]
Steering 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 […]
Pipe leak leads to loss of all 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 […]
Vessel rotation leads to loss of position – DP incident
Case narrative A DP2 ROV support vessel was working close to a metrological (met) mast within a wind farm. With ROV work completed, the project instructed the vessel to be […]
Unreliable 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 […]
Mix 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 […]
Operating outside DP equipment class 2 requirements – DP incident
Comments from the report: Although DP checklists were completed, the availability of the standby operator station was not confirmed. The most probable cause for DPOS2 to freeze and not auto […]
Planned investigation resulted in DP incident
Comments from the report: An AVR problem in diesel generator No. 1 engine caused an over voltage in the system. Due to increased voltage, the standby machine could not be […]
Case study – Load sharing imbalance caused loss of position
Case narrative A DP2 pipelay vessel was set up on auto DP engaged in pipelay operations, inside the 500m zone of a fixed platform. The DP design concept of the […]
Case study – Switching from auto DP to IJS (independent joy stick) mode caused loss of control
Case narrative A vessel collided with the working platform on a wind turbine transition piece. The incident occurred during worsening weather conditions. The vessel was on auto DP, when it […]
Case study – Switching to manual mode caused loss of position
Case narrative A DP2 platform supply vessel was set up on auto DP engaged in cargo operations inside the 500m zone of a fixed platform. The DP design concept of […]
Unintentional deactivation of the DP system – DP incident
Comments from the report: The initiating event was the unintentional activation of the DP standby button whilst in Automatic DP control. The radio used to call the installation control was […]
Unintentional selection of manual mode – DP incident
Comments from the report: Initiating event: Inadvertent selection of manual mode whilst in full DP mode Main cause: Human factor – The vessel mode of operation was changed from automatic […]
Thruster command and feedback differences leads to – DP incident
Investigation comments: The DP system reported a thruster pitch prediction error when a large difference between the command and feedback was detected at 20:35:34. The description for a thruster prediction […]
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