An engineering crew aboard a cruise ship, working with technicians from the engine producer, was overhauling a big diesel generator. They used the engine room’s overhead gantry crane to carry heavy elements. In the course of the operation, a 1200kg cylinder liner was being lifted into place above the engine. The electrical winch motor raised the crane hook to its most top when the crane’s hoisting wire abruptly snapped. The cylinder liner fell onto the engine, damaging each the engine and the liner, and struck the left foot of a close-by fitter, inflicting a damaged toe. The injured crew member was handled within the hospital and later repatriated, experiences MAIB.
In regards to the incident
The hoisting wire had been renewed shortly earlier than the upkeep started however was 7 meters shorter than specified within the crane producer’s technical handbook. The shorter wire size compromised the crane’s hoist restrict change, stopping it from chopping energy to the winch motor when the hook reached most top, overloading the wire and inflicting it to snap.
Exams on the remaining three engine room cranes revealed that their restrict switches additionally failed to chop energy to the winch motors, falling wanting the producer’s necessities. A comparability of the wire lengths recorded within the ship’s deliberate upkeep system (PMS) with the producer’s specs confirmed discrepancies.
Consequently, the cranes had been taken out of service for restore, and the engineering crew was instructed to conduct a full inspection of engine room hoisting gadgets to make sure compliance with producer specs. They had been additionally reminded to check the hoist restrict switches earlier than working the cranes.
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Supply: MAIB
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