Class 4 (4th Engineer) SSEP 📅 May 2024

Exam Question

Considering that the engine room is the most common single space on board ships for fire to break out, discuss the merits and demerits of the following fixed fire fighting systems: (20)

(a) Carbon dioxide

(b) Pressure water spray

Reference Answer

### (a) Carbon Dioxide (CO2) Fixed Fire Fighting System
**Principle of Operation:**
Carbon Dioxide (CO2) systems extinguish fires primarily through the principle of 'smothering'. When discharged, CO2 rapidly displaces oxygen in the protected space, reducing its concentration below the critical level (typically around 15% by volume) required to sustain combustion for most fuels. Secondary effects include some cooling due to the rapid expansion of the gas.
**Merits (Advantages):**

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