MEANING OF FIRE AND THE ELEMENTS OF FIRE
Fire is defined as a chemical reaction between two or more substances that can evolve to heat and
light. These substances include air such as oxygen, fuel such as DPK and a source of heat.
When these elements are represented diagrammatically it forms a triangle.
CLASSES OF FIRE AND METHODS OF EXTINGUISHING
Classes of fire include – A, B, C, and DClassification of fire is based on what is burning.
Class A
Class A fires consist of ordinary combustibles such as wood, paper, trash, cloths, nylon, wood, rubber, plastic etc. water works best to extinguish a Class A fire.Class B
This are fire that involves flammable liquid or combustible liquids such as paint, kerosene, petrol, diesel, animal fat etc. The best method of extinction is smothering.Class C
This fire involve gaseous materials e.g. propane, ethane, butane, methane and natural gas.Extinguisher such as carbon dioxide is used in class c fire
Class D
This fire involve combustibles metal fires. Magnesium and titanium are the most common types ofmetal fires. Once a metal ignites do not use water in an attempt to extinguish it. Only use a Dry
powder extinguishing agent. Dry powder agents work by smothering and heat absorption.
Fire Extinguisher
The methods of extinguishing fire is classified into three.These are;
Cooling: this is done so as to eliminate one of the element of fire which is heat and it can be achieved
by use of water or extinguisher.
Smothering: This process helps to eliminate air (oxygen) and it can be done by use of blanket or
foam extinguishers.
Starvation: This is the process of cutting out the fuel supply so as to arrest the fire.
TYPES OF FIRE EXTINGUISHER
- Dry chemical powder
- Foam
- Carbon dioxide
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