While a workboat was trying to conduct a transfer operation, its engine stopped working. Despite the fact that the crew made several attempts to restart it, they were all unsuccessful.
The incident
During a crew transfer operation by workboat, the workboat’s engine stopped working. The crew’s Engineer made several attempts to restart the engine however this was unsuccessful.
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The Coxswain the contacted the Master and informed him about the situation. The vessel proceeded to attend and the workboat was then safely recovered to the mother vessel.
Probable cause
The vessel’s Engineers conducted an investigation on the work boat. They found that the fuel in the tank was contaminated because of water condensation causing a bacteria buildup.
- Source of Contamination: Water / moisture in tank was due to condensation in the tank head space. This resulted in a buildup of bacteria, which turned into sediment. The sediment caused the fuel oil fine filter to clog preventing the engine from starting.
- Planned Maintenance System (PMS): The instructions within the PMS regarding inspection and maintenance were clear, however they were not followed.
- Spare Filters: The vessel did not hold spare filters on-board.
Lessons Learned
- Check fuel and tank quality through planned maintenance inspections, treat and/or clean as applicable;
- Ensure workboat fuel tank levels are maintained to prevent condensation/water building up;
- Ensure a stock of essential fuel filters are held on board.
