Alerts iconLeak 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 to the port main engine.  This caused air to be drawn into the system and the engine to shut down.  Redundancy worked as designed.  The … Continue reading “Leak in fuel supply line causes engine to shut down – DP undesired event”

Alerts iconRoutine 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 on the line to the pressure switch.  The location of the oil sample point on the line to the pressure switch creates a risk of … Continue reading “Routine maintenance leads to loss of thruster – DP undesired event”

Alerts iconElectrical 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 dismantled. Under the instructions from the manufacturer, the thruster was set up to work up to a maximum of 60% of the load. The activity … Continue reading “Electrical fault causes loss of thruster – DP undesired event”

Alerts iconA 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 supplier of this equipment. It was also removed following consultation with the original equipment supplier. Considerations of the IMCA Marine DP Committee from the above … Continue reading “A retrofitted capacitor caused a bow thruster frequency drive to overheat – DP observation”

Alerts iconAn 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 on the forward bridge had a fault, failure of it caused Gyro 2 to shut down. When the ‘Gyro 2 remote control unit’ was disconnected … Continue reading “An unassociated failure of one part of a gyro system affected the DP system – DP undesired event”

Alerts iconLack 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 trip of DG1 and DG3 with a consequence that the forward thrusters tripped. Based on conclusions from the technical analysis the primary reason (root cause) … Continue reading “Lack of maintenance caused a problem involving the bus tie breaker – DP undesired event”

Alerts iconUnintentional 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 situated over the DP control panel. In order to put the DP system in ‘Standby Mode’ it required the operator to Press the ‘Standby’ button … Continue reading “Unintentional deactivation of the DP system – DP incident”