digest ferry


cruise ship digest


››› and occasional network overvoltage fluctuations. The capacitor deterioration had not been detected, and because there were no internal fuses or pressure relief devices, it had continued until the capacitor casing failed catastrophically. Although the aft HF circuit


breaker disconnected the HF from the rest of the electrical network to isolate the electrical fault, the disruption was likely to have caused instability in the electrical network which led to the loss of propulsion and blackout. The vessel’s alarm logs were found to contain early warnings about the impending failure approximately 36 minutes before the accident. However, as the vessel’s alarm systems regularly logged more than one alarm every minute,


Queen Mary 2 undergoing refit at Blohm + Voss in December 2011


this information was not seen or acted upon. The only protection against


catastrophic failure of the capacitors was a current imbalance detection system. The safety lessons highlighted included: • Protection systems for critical equipment must ‘fail safe’, and


should be thoroughly tested at regular intervals to prove that all sub-components are functioning correctly. In particular, HFs with current imbalance protection systems should be thoroughly checked by a competent person at the earliest opportunity. • Awareness of the damaging effects of harmonic distortion


Time is of the Essence ADONIS - THE GLOBAL HUMAN RESOURCE SOLUTION


• Web Recruitment • Crew Management • Payroll • Crew Planning • Course Scheduler • Competence Matrix • Documents Handling • Mail Merge • Crew Station Bill • Crew Effects


Crew Portal with Time & Attendance


Automatic ship-shore replication of crew and payroll information. For more information, visit www.adonis.no


10 I Passenger Ship Technology I Spring 2012 www.passengership.info


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