Alerts iconSpecialised 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 checking, it was verified that the ‘waypoint for radius turn’ had changed to ‘operator’ a pre-set value of 200m; the vessel standard setting is ‘waypoint … Continue reading “Specialised pipe laying DP mode – DP undesired event”

Alerts iconLoss 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 because of voltage instability.  The voltage instability was caused by a spike load on an unrelated circuit breaker on the same switchboard which tripped.  Because … Continue reading “Loss of tunnel thruster – DP undesired event”

Alerts iconPosition reference systems – a timely reminder

The IMCA Marine DP committee has identified a trend of DP station keeping events relating to the incorrect use or selection of PRSs.  Events reported to IMCA include incidents, where station keeping capability has been lost and undesired events where redundancy has been compromised. Recent Events Reported to IMCA Include the Following Learnings: Incorrect selection … Continue reading “Position reference systems – a timely reminder”

Alerts iconInadequate 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 into the cooling system.  The vessel was idle for some time in shallow water and the systems were not adequately preserved.  There was biological fouling … Continue reading “Inadequate shallow water lay-up reactivation procedures”