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Class 4 (4th Engineer) SSEP 📅 Aug 2025

Exam Question

(a) Draw and explain a fixed Foam fire fighting system. (12) 

(b) What is the propotion ratio of both high expansion and low expansion Foam fire fighting system? (4) 

(c) What periodic test are carried out to ensure the readiness of the fixed foam fire fighting system? (4) 

Reference Answer

### (a) Fixed Foam Firefighting System
A fixed foam firefighting system is a mandatory installation on most ships, designed to combat Class B fires (flammable liquids) in high-risk areas such as machinery spaces, pump rooms, and on the decks of tankers. The system extinguishes fire by applying a foam blanket over the fuel surface.
#### Principle of Extinguishing Action
The foam acts on the fire in three primary ways:

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