PORTABLE (FIRST AID) FIRE EXTINGUISHERS:


After the fire has been detected appropriate action has to be taken to extinguish the fire with the right type of fire extinguisher. Different types of Fires have different characters and therefore, an appropriate type of Fire Extinguisher is required to be used. For instance, on Fire involving live electric circuit or electrical equipments, water based fire Extinguishers cannot be used as the same will cause Electrocution. Therefore, it is essential to select an appropriate fire Extinguisher for the classes of fire.


CLASSIFICATION OF FIRES:

For all practical purposes, fires can be classified under the following heads.

a) Class 'A' Fires - Fires in ordinary combustible materials such as wood, paper, textiles etc.

 

b) Class 'B' Fires - Fires in inflammable liquid like Oils, Solvents, Petroleum products, Varnish, Paints etc.

 

c) Class ' C' Fires - Fires involving gaseous substances under pressure.

d) Class 'D' Fires - Fires involving metals like Magnesium, Aluminium, Zinc, Potassium etc.

Note: Fires caused due to electrical short-circuits etc. are classified under "Mixed occupany".

 
Type of Fire Classes Extinguishers Extinguishing agent
Suitability on different fires
A
B
C
D
WATER TYPE
(Soda Acid/Water CO2)
WATER
Cooling water
YES
NO
NO
NO
Foam Type
Chemical/Mechanical
Foam
Blanketing
NO
YES
NO
NO
Dry Chemical Powder Type
Standard/special
Dry Powder
Blanketing
NO
YES
YES
YES
Carbon DidOxide
CO2 TYPE
CO2 GAS
Enveloping/cooling
NO
YES
YES
NO
     




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