Class 4 (4th Engineer) SSEP 📅 Oct 2025

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 and Prevention of Scavenge Fires
A scavenge fire is an enclosed-space fire occurring in the scavenge air manifold or the under-piston spaces of a two-stroke crosshead diesel engine. The occurrence requires the presence of the three elements of the fire triangle: Fuel, Oxygen, and Heat.
**Causes of Scavenge Fires (Formation of the Fire Triangle):**
1. **Accumulation of Combustible Material (Fuel):**

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