Class 4 (4th Engineer) SSEP 📅 Apr 2024

Exam Question

State the causes of scavenge fire in a two-stroke engine and explain how the possibility of such an occurrence can be reduced. If a Seavenge fire does occur what action should be taken? Discuss the use of CO2 and dry powder for extinguishing such a fire and describe a fixed installation for applying one of these chemicals. (20)

Reference Answer

A scavenge fire is an enclosed-space fire occurring in the scavenge air receiver or trunking of a two-stroke crosshead diesel engine. The fire's sustenance depends on the presence of the classic fire triangle: Fuel, Heat, and Oxygen.
* **Fuel**: Accumulations of carbonized lubricating oil, unburnt or partially burnt fuel oil, and carbonaceous deposits from combustion products.
* **Heat**: An ignition source, typically from 'blow-past' of hot combustion gases from the cylinder into the scavenge space.
* **Oxygen**: Abundantly available from the scavenge air supplied by the turbocharger.

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