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 […]
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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 [email protected]
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
Leak in fuel supply line causes engine to shut down – DP undesired event
Comments from the report: The vessel was employed within the renewable energy sector, no details were given of the drilling activities. A fuel leak developed in a corroded supply pipe […]
Good practice following system self-test alarm – DP observation
Comments from the report: The error was traced to a serial interface module for DP Controller A and confirmed that the red error lamp on this module was illuminated. Whilst […]
Routine maintenance leads to loss of thruster – DP undesired event
Comments from the report: During a routine weekly maintenance operation, a ships engineer took an oil sample from the starboard azimuth thruster sample point, which is a small valve located […]
DP controller problems – DP undesired event
Considerations of the IMCA Marine DP Committee from the above event: Redundancy was lost; therefore, a yellow alert should be initiated. Good practice is to acknowledge and investigate the cause […]
Electrical fault causes loss of thruster – DP undesired event
Comments from the report: One of the three frequency converters on the port azimuth thruster was found to be burnt out. Initial actions: The thruster was isolated and faulty converter […]
A retrofitted capacitor caused a bow thruster frequency drive to overheat – DP observation
Comments from the report: A wrongly installed extra capacitor at the bow thruster frequency drive caused overheating of this equipment. The extra capacitor was installed by the electrical designer and […]
An unassociated failure of one part of a gyro system affected the DP system – DP undesired event
Comments from the report: A new gyro was installed as a replacement but failed to start with first attempt. Further investigation revealed that the ‘Gyro 2 remote control unit’ located […]
Lack of maintenance caused a problem involving the bus tie breaker – DP undesired event
Comments from the report: The power management system was set for semi-automatic mode as required for DP2 operations. Uncontrolled and unsynchronised closure of the bus tie breaker resulted in simultaneous […]
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 […]
Common mode failure of DGNSS – DP undesired event
Comments: Both DGNSS systems had locked up, the touch screen was not responding and the NMEA signal was no longer being received, the DP system alarm displayed ‘Telegram timeout’. The […]
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 […]
Lack of planning and situational awareness causes – DP incident
Comments: The event was investigated by the vessel operator, findings are summarised here: Human factors: The DPO was left alone at the DP console during critical subsea operations. In such […]
Check of the UPS led to loss of power – DP incident
Comments: At approximately 1555 the ETO came to the bridge and asked the Senior DPO permission to enter the electronics room to check the UPS batteries. The SDPO gave permission, […]
Temporary connection to DP system caused short circuit – DP undesired event
Comments: Various DP equipment, including the DP status lights, were connected via UPS No. 2. Investigation found that the UPS tripped because of a break in the portable cable supplying […]
Following a track on DP causes power issues – DP incident
Comments: The report finding from the vessel concluded: The initiating event was a sudden increase of propulsion to full ahead. The main cause was attributed to the computer with unexpected […]
High voltage breaker trip – DP observation
Comments: Investigation started at the breaker for DG No. 5 in the port switchgear room. The breaker showed tripped and there was a fault present on the auto voltage regulator (AVR). DG No. 5 […]
Both DP operating stations stopped communication – DP incident
Considerations from the above event: It is possible that as the vessel was only recently set up on DP, field arrival trials had not yet been completed. The use of […]
Rip tide presents problems – DP observation
Comments It was a single rip tide and when it had passed the vessel was set up back in automatic position mode. There was clear evidence that a degraded performance […]
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