It is a fixed type foam fire-extinguishing system that is installed on the upper side of combustible oil storage tank and discharges the foam to the surface of fluid stored inside the tank in case of fire to separate oxygen from air. When the aqueous solution mixed with the foam agent is released through the orifice inside the foam chamber, the barrier film for preventing the backflow of oil mist ruptures and the low-expansion foam is generated by mixing the aqueous solution and the inhaled air.
The foam is not scattered by the deflector installed on the inner wall of the tank, but flows along the inner wall,
and flows on the surface of the oil. Vapor seal for blocking the inside of the foam chamber includes seal glass and a rupture disc. It prevents oil mist and gas generated from stored oil etc. from entering the piping connected to the foam chamber to protect life and damage of equipment, which ruptures and releases foam.
A deflector includes type II used for a cone roof tank and floating roof tank. Inlet pressure should be at least 3.5 barg or higher when installing a foam chamber. 

FOAM TANK (BLADDER TYPE)

It is a tank for storing foam liquid installed with a pressure proportioner or a diaphragm pressure proportioner. A bladder bag is installed inside the tank, so foam liquid is stored inside the bag. The stored foam liquid is pushed by the pressure in the water supply line to be discharged and mixed with fire water. A tank is made of carbon steel. The inner wall is not in contact with the foam liquid but is in contact with water, so it is coated with anti-corrosion coating to prevent corrosion. The built-in bladder bag is made of a material that is not hardened or aged by the foam liquid and is not damaged by pressure, so that the lifetime is longer and more stable.

NON-BLADDER TANK

It is a tank for storing foam liquid applied to a mixer that has a self-inhaling function such as a pressure side proportioner and a line proportioner or a pump proportioner.
As the foam liquid comes into direct contact with the tank surface, it is mainly made of stainless steel to prevent corrosion by the foam liquid. In order to prevent the evaporation or deterioration of the foam liquid at the normal time and to smoothly inhale the air, the air vent suitable for the maximum discharging amount is installed.