| Course of events
A major ingress of water happened in the engine room when the vessel was on a transit voyage. Within a short time, the lower engine room was flooded and electric motors short-circuited. External assistance was eventually obtained and the ship was towed safely to port.
Extent of damage
The engine room was flooded to the top of the main engine. Although immersed for a short time only, all motors, generators, starters, cables and other electric equipment had to be overhauled and renewed in parts or total.
Probable cause
Routine maintenance of the engine room main sea strainer had been carried out prior to the casualty. The most probable cause of the casualty was found to be inadequate control of and co-ordination of ongoing maintenance work on board.
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During the work the crewmember working on the strainer had been called away for another job, leaving the strainer open. Apparently unaware of the maintenance work going on, one of the ship’s engineers had opened the sea valve next to the strainer from the control room, resulting in ingress of water through the open strainer. The high level bilge alarm was automatically activated but had been acknowledged by one of the engineers without further action.
As the crew became aware of the situation, the sea valve could neither be closed remotely nor manually due to the high water level.
Lessons to be learned
This is one of several incidents over the years where opening up of sea water systems during maintenance has caused flooding of the engine room as a result of operational mistakes, seriously jeopardising the safety of the involved vessels. |