Class 4 (4th Engineer) SSEP 📅 Dec 2023

Exam Question

(a) State the causes of scavenge fire in a two-stroke engine and explain how the possibility of such an occurrence can be reduced (10)

(b) If a Scavenge 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 substances. (10)

Reference Answer

### (a) Causes of Scavenge Fire and Prevention
A scavenge fire is the combustion of accumulated flammable materials within the scavenge air spaces of a two-stroke crosshead diesel engine. The occurrence requires the presence of the three elements of the fire triangle: Fuel, Heat, and Oxygen.
**1. Causes of Scavenge Fire (The Fire Triangle)**
* **Fuel Accumulation:** The primary fuel source is the deposition of combustible materials:

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