COMBUSTION AND FIRE
FAIR FIGHTING FOAM
A combustion reaction is a type of chemical reaction in which a substance reacts with an oxidant releasing light and heat. Combustion reactions are divided into two, rapid combustion and slow combustion. An example of a slow combustion is the iron rusting with oxygen in the air. In the case of rapid combustion, flame formation is observed. Combustion reactions occur with oxygen, heat and fuel. In order to extinguish the combustion reaction, one of the three components must be removed. Fire also includes the material and moral damages resulting from the combustion.
What is Fire Fighting Foam and How It Forms?
Firefighting foam concentrate is mixed with water and the foam forms when this solution expands with air. Its purpose is to form a layer on the flammable material to extinguish the combustion, reducing the temperature and excluding the oxygen and heat from the fuel surface.
The following extinguishing effects are used when using foam;
Separation Effect -Cooling Effect -Suppression Effect – Insulation Effect – Covering Effect
The mixed foam indicates the ratio of the amount of the substance to the amount of water. For example, there are 3 scales of foam and 97 scales of water in a mixture ratio of 3%. In the extinguishing system, the foam concentrate is dosed with an injection mixer, pressure mixer or dynamic pressure mixer. Mixture ratio is between 0.1% and 6%.