A foam fire extinguisher is a tool that uses chemicals that can form a stable foam and driven by carbon dioxide at the moment out of the tube. AFF Foam that comes out will envelop the burning material so it can extinguish the fire because oxygen could not enter the process of fire. The foam fire extinguisher can be used in areas where water extinguisher types cannot be used. As in the area contained oil that cannot mix with water.
Foam fire extinguisher working
To do a blackout against the fire happened, things to know is the kind of fires that occur. After knowing the kind of fire, then we can tell the media blackout for proper use. The wrong media will only result in a fatal impact. The fire itself is divided into several classes between grades A, B, C, D, E, and K, But the most common is a class A, B, and C.
Class A fire was a fire that occurred in materials such as wood, cloth, and the like. Media that can be used is water and foam. But wisely, water is the most appropriate to use. Class B fire is a fire on a fuel and gas, the most appropriate media is foam. Class C fire is a fire caused by an electric current, the right media is a dry chemical.
History of Foam fire extinguisher
The foam originally introduced by engineers and chemists Russia, Alexander Loran in 1902. Aqueous foam is a mixture of water, sodium bicarbonate, aluminum sulfate. The composition on a lighter foam fire extinguisher is a solution of nitrogen and foam in the tiny tubes in order to put pressure. So, the foam solution pushed out and produce the spray. The working principle of the foam is by how close the burning material so that the connection of oxygen contained in the air cannot enter. As well as providing cool effects around a fire.
Foam fire extinguisher ingredients classified into two types, namely:
1. Class A foam.
This type of foam fire extinguisher began to be developed to put out forest fires in the mid-1980 ‘s. A foam is capable of lowering the surface tension of the water and give fuel saturation. Also, this is useful to prevent burning back.
2. Class B foam fire extinguisher
Class B foams made to handle a class B fires or flammable fuel. There are two types of class B foam, namely:
1. Synthetic foams, in accordance with its name the foam used, is a synthetic foam. The advantage of synthetic surfactants are fast flowing and knockdown on fire faster
2. Aqueous film forming foams (AFFF) is a type of foam that contains water and hydrocarbon type surfactants such as sodium alkyl sulfate, and fluorosurfactant such as fluorotelomers, acid perfluorooctanoic, perfluorooctanesulfonic acid. The aqueous film forming foams (AFFF-AR) is a foam that is resistant to the reaction, can form a protective coating when sprayed.
Advantages of foam fire extinguisher:
1. Best used to extinguish fires class A and B
2. Foam is light and effective if used to extinguish burning fuel. 3. The principle of work is to isolate the fire so that the fire did not spread
4. The foam has a principle in extinguishing the blaze by shutting down the base of the fire, it is aiming to avoid the occurrence of flare
The use of a foam fire extinguisher class
The procedures for the use of the foam fire extinguisher:
1. Spray above the surface of the fire
2. Spray to the back of a container that contains a search of burning or over the surface of the vertical behind the container
3. Use a sweeping motion from side to side to cover all parts of the burning
4. Don’t get too close to the fire
5. Do not spray directly to the burning liquid because it will spread the burning liquid into the wider area