Classes Of Fires And Extinguishers
by Afnan Tajuddin · August 3, 2019
Our today’s Toolbox Talks topic is Classes Of Fires And Extinguishers
American | European/ Australasian | Fuel/Heat source |
Class A | Class A | Ordinary combustible materials such as wood, cloth, paper, etc. |
Class B | Class B | Flammable liquids such as grease, gasoline, lubricating oils, and other hydrocarbons. |
Class C | Flammable gases |
Class C | Class E | Electrical equipment |
Class D | Class D | Combustible metals like sodium, magnesium, aluminium, etc. and phosphoric substances. |
Class K | Class F | Cooking oil or fat |
CLASSES OF FIRES AND EXTINGUISHERS :
Water

Used on class “A” fires. Cools the fire to below ignition temperature. Force will last for 2 minutes and can reach 40 feet distance. Pressure is stored in gas cartridges inside the cylinder.

Used on all classes of fires. Stops the chain reaction by smothering. Pressure is generated by Gas cartridges stored inside the cylinder. Its force will last for 2 minutes and can reach 10 – 15 feet.
Foam

Suitable for classes A&B fires. Fire is extinguished by isolating oxygen from fire. Pressure is stored in gas cartridges. Can fight fires upto 20 feet distance and lasts for 2.5 minutes.
Halon

Most suited for electrical fires. Extinguishes the fire by displacing oxygen. Halon cylinders are obsolete now as they contain chloro flouro carbons which are harmful to the environment. So they are being replaced by eco-friendly gases.
CO2

Removes / displaces oxygen. Suitable for classes A, B, C fires. Ideal for electrical fires. Its pressure lasts for 15 seconds only and not suitable for distant fires.
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