The fire-fighting foam tank is mainly composed of a foam liquid pressure storage tank with a capsule and a PHYM pressure proportional mixer made by using the Venturi principle. When the water in the system pipe network flows through the pressure reducing orifice of the proportional mixer, The pressure difference will be formed before and after. Part of the water at the pressure height enters the tank through the inlet pipe of the foam tank, squeezes the capsule, and squeezes the foam liquid in the capsule through the outlet pipe of the foam tank to the low pressure of the proportional mixer and mixes with the water to form a foam mixture. The foam mixture is output to the foam generating equipment and mixed with air to produce foam to extinguish the fire.
The filling of foam fire extinguishing agent in foam tanks is mostly carried out at the engineering installation site. Generally, the filling should be carried out by the personnel of the manufacturer or on-site guidance, and the procedures should be strictly followed. The principle that foam tank filling should adhere to is that in the filling process, one side of the capsule should be avoided.
The fire-fighting foam liquid manufacturer stated that the water injection is to fill the interlayer between the storage tank and the capsule, and its function is to drain the air in the interlayer to prevent the air from being compressed when the pressure is high, and the outside of the capsule is locally compressed to form an air drum and rupture. The second is that the capsule can be suspended in water during filling, which can prevent the flange connection at the top of the capsule from being pulled and torn due to factors such as the gravity of the foam extinguishing agent.
Foam tank leak detection refers to the application of appropriate water pressure to the water in the interlayer to check whether the capsule has been broken. The main purpose is to ensure that the capsule is intact before filling the foam fire extinguishing agent, and to avoid filling the damaged capsule and causing waste.
Foam tank inflation refers to filling the capsule with an appropriate volume of nitrogen or air at an appropriate pressure. Use gas to expand the capsule to prevent local adhesion of the capsule, which is conducive to the filling of foam liquid. The second is to form a partial air suspension volume on the top of the capsule, so that the capsule can withstand sufficient buoyancy during the filling process and avoid the connection of the capsule flange Excessive force.
Foam fire-fighting equipment filling refers to filling the capsule with foam fire-extinguishing agent after the previous steps are completed and qualified. The fire-fighting foam liquid manufacturer reminds that the filling pressure should not be too high, the speed should not be too fast, and should not exceed the design storage capacity of the tank. The interlayer between the storage tank and the capsule should be left with water storage space to avoid overfilling the capsule and the tube wall, which will affect the normal operation of the pressure foam tank.