INTRODUCTION OF EXTINGUISHER :
Chemical Extinguisher are essentially a class of handy portable fire fighting applicances, with a Limited capacities of fire extinguishing media. They are also called portable Fire extinguisher or first aid, fire fighting applicances for use only on certain type of fire in the incipient stage.
Portable is applied to manually operated Fire extinguisher use specially on small fire or in the interim between discovery of fire and function ine of automatic equipment or arrival of professional firefighters.
They are generally small and light in weight and can be carried easily from place to place. Large models of certain types known as trolly units and chemical engines are mounted on Simple two wheel chassis, fitted with a length of hose to extend the available range. The extinguishing agent might be chemicals in the form of very fine solid particles, liquid or gas, contain are the cylinders.
Fire can be divided into two groups wanted and unwanted the fire group includes fire which provide various volatility of man such as fire for cooking and warm for power and locomotion for a travel to moon and back to earth, etc. The second group of fires are the one which were traded to lay man, the uncontrol fire which Burn It Down his dwellings, his workplace is forest wealth is hardearned precious good & cause death, and misery to his near and dear ones. It is this group of fire for which the methods have been developed for their suppression and prevention.
The fire fighter of today living in a world which is fast advancing in Science and technology is for remove from his counter part of by gone years. He confront han increasing variety of fires, involving both natural and manmade materials in ever growing Complex combinations. His job involves much more than just throwing water on each and every fire. It has become necessary for him to know the nature and type of combustible materials and their behaviour in a fire in order to select the correct extinguishing medium and to achieve extinguishment at the minimum time without any risk to his own person.
He has therefore, to acquire an adequate knowledge in many diversified field and the range specialisation has expanded from use of plane water to the use of most modern vaporizing liquids.
WATER TAPE ( STORED PRESSURE ) EXTINGUISHER :
GAS CARTIDGE FOAM SOLUTION TYPE F/E :
CLASSIFICATION OF FIRE :
The fire scientist have classified all fires into various categories on the basis to the natural of combustible materials, and two situations in which they might be found. As per I.S.S. 2190-1979 the classification of virus is given as under :-
1. Class 'A' Fire :- Fire in ordinary combustible materials such as wood, paper, Textiles etc. Where the cooling effects of water is essential for the extinction of Fire.
2. Class 'B' Fire :- Fire in inflamable liquids such as acids, organic solvent, petroleum products, vanishes, Paints, etc. Where a blanketing effect is essential for the extinction of fire.
3. Class 'C' Fire :- Fire involving gaseous substance - such as methane, propane, butane, acetylene, cooking gas including natural gas ( under pressure ), where it is necessary to dilute the burning gas at a very fast rate with an insert gas or dry chemical powder.
4. Class 'D' Fire :- Fire involving burning the powders of combustible metals such as magnesium aluminium zinc for alkali e metals like Sodium and potassium where the burning metal is reactive to water and which require special extinguishing agents and techniques.
• SUITABILITY OF DIFFERENT TYPES OF PORTABLE FIRE EXTINGUISHER FOR DIFFERENT CLASSES OF FIRE :
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