This case study covers events that occurred on the same vessel, 8 months apart. The DP equipment class 2 vessel is fitted with six position references systems, 3 DGNSS, 2 […]
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
Duty/not duty, which is the question?
This DP event occurred on an FPSO. The FPSO is fitted with one bow tunnel thruster and two stern azimuth thrusters; however, at the time of the event the starboard […]
Human Factor Caused a DP Undesired Event
Comments from the report: The report detailed that there was a “bug” in DP-A station. To resolve the issue DP-A and B as well as MTC stations were stopped at […]
Human Factor caused a DP Undesired Event
Comments from the report: The vessel was operating in shallow water and a strong current. There were several heading changes prior to the event. It was noted that heading changes, […]
Unreliable component causes a DP undesired event
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 […]
DP undesired event due to online maintenance work
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 […]
DP3 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 […]
Accidental breaker trip – DP undesired event
Comments from the Report: The vessel was experiencing heavy rolling and pitching. The watch keeping engineer lost his balance and his hand made contact with the No. 2 shaft generator […]
Failure of DP UPS – DP undesired event
Comments from the Report: The vessel maintained position but DP equipment class 2 capabilities were compromised. It was noticed that there was a strong burning smell from the UPS. The […]
Unfamiliarity with DP system leads to – DP undesired event
Comments from the report: Both DPOs had several years’ experience but with a different DP control system where it is common to stop the vessel during a move by reducing […]
Software update caused loss of generators in separate redundant groups
Case narrative A DP2 platform supply vessel (PSV) was set up on auto DP whilst conducting trials in open water after extensive upgrades. The redundancy concept was based on two […]
Leaking cooling water pump leads to – DP undesired event
Comments from the report: A leaking seal was observed on the Port ME cooling water pump; it was replaced, and the engine tested prior to returning to operations. Considerations […]
Maintenance during DP operations leads to – DP undesired event
Comments from the report: The oil level gauge was not reading the actual level. The duty Engineer did not inform Bridge/DPO`s of maintenance on the header tank of stern thruster. […]
Loss of one redundant group – DP undesired event
Comments from the report: A partial blackout of the centre high voltage (HV) switchboard at 11.04am caused by No. 2 generator. This caused the loss of the 440V distribution board […]
Specialised pipe laying DP mode – DP undesired event
Comments from the report: When the vessel was confirmed stopped and on the setpoint, the operator checked the auto track setting to find the cause of the track change. Upon […]
Loss of tunnel thruster – DP undesired event
Comments from the report: During diving operations in open water, tunnel thruster No. 1 tripped offline. Investigation showed that the cause was due to tripping of the thruster hydraulic pump […]
Use of third-party equipment leads to DP undesired event
Comments from the Report The UPS and the DGNSS source does not fall under the vessel’s planned maintenance system (PMS), as this is owned by the survey company. The equipment […]
Inadequate shallow water lay-up reactivation procedures
Comments from the Report The heat exchange system is poorly designed and without redundancy for half of the switchboard. Design flaws were compounded by the introduction of turbidity and silt […]
Isolation of backup supplies to DP critical equipment
Case Narrative A DP 2 vessel was engaged in open water ROV operations with both ROVs and cranes in the water – the hook recovery was ongoing. The vessel was […]
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 […]
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