Class 4 (4th Engineer) SSEP 📅 Sep 2022

Exam Question

Mechanical foam used for fire fighting is produced by mechanically mixing and agitating:

(a) Soda acid and water - True/False

(b) Dry chemical and water - True/False

Justify your answer with suitable sketch and details of working (20)

Reference Answer

### Evaluation of Statements
* **(a) Soda acid and water - False.**
This combination produces **Chemical Foam**. The process involves a chemical reaction between an alkaline solution (sodium bicarbonate) and an acidic solution (like aluminum sulphate). The reaction generates Carbon Dioxide (CO2) gas, which is trapped in the liquid to form a bubble structure. This method is largely obsolete on modern vessels in favour of more efficient mechanical foam systems.
* **(b) Dry chemical and water - False.**

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