AFF Exit Exam • Set 2 Question 15 of 30

What type of foam compound is most effective for extinguishing polar solvent alcohol fires on chemical tankers?

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Direct Answer

Option A: Alcohol-Resistant Aqueous Film-Forming Foam (AR-AFFF)

Polar solvents are water-miscible and destroy standard foams by breaking down their bubble structure. Alcohol-Resistant Aqueous Film-Forming Foam (AR-AFFF) contains a polymer membrane that creates a protective barrier between the fuel and the foam blanket, preventing the alcohol from dissolving the foam and allowing for effective fire suppression.

All Options

A

Alcohol-Resistant Aqueous Film-Forming Foam (AR-AFFF) (Correct Answer)

B

High-Expansion Synthetic Foam

C

Fluoroprotein Foam

D

Standard Protein Foam

Detailed Explanation & Context

Polar solvents are water-miscible and destroy standard foams by breaking down their bubble structure. Alcohol-Resistant Aqueous Film-Forming Foam (AR-AFFF) contains a polymer membrane that creates a protective barrier between the fuel and the foam blanket, preventing the alcohol from dissolving the foam and allowing for effective fire suppression.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).

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