Class 4 (4th Engineer) SSEP 📅 Jan 2024

Exam Question

(a) Sketch and descebe a 50 ltrs. Mechanical foam Fire Extinguisher, giving details with respect to (12)

(i) Type of gas used as expellants

(ii) Throw reach

(iii) Working and test pressure

(b) Explain the procedure for re-charging the same after use (8)

Reference Answer

### (a) 50 Litre Mechanical Foam Fire Extinguisher
#### Principle of Operation
A 50-litre mechanical foam fire extinguisher is primarily designed for tackling large Class B (flammable liquids) fires and can also be used on Class A (solid combustibles) fires. Its effectiveness stems from the properties of the foam produced:
* **Smothering:** The foam blanket covers the fuel surface, cutting off the oxygen supply and interrupting the combustion process.

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