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Class 4 (4th Engineer) SSEP 📅 Nov 2025

Exam Question

(a) Sketch and describe a non-portable 136 liter foam fire extinguisher. (8)

(b) Briefly explain how to operate the foam extinguishers. (3)

(c) State the two constituents used, which enable stable foam to be produced. (3)

(d) State for what approximate length of time, the engine should generate foam. (3)

(e) Where on board ship would you expect such an extinguisher to be located. (3)

Exam question diagram

Reference Answer

### (a) Sketch and Description of a 136-litre Foam Fire Extinguisher
**Description:**
A 136-litre non-portable foam fire extinguisher is a large-capacity, mobile unit designed for tackling substantial Class B (flammable liquid) fires, typically found in machinery spaces. It operates on the principle of chemical foam generation, where two solutions are mixed to create foam through a chemical reaction.
**Construction Details:**

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