Talking About Foam Fire Extinguishing Systems

Foam fire extinguishing systems are classified according to the foaming factor: low-power foam fire extinguishing system, the foaming ratio is less than 20 times; Medium multiplier foam fire extinguishing system, foaming multiplier 20~200 times; High multiplier foam fire extinguishing system, foaming multiplier 200~1000 times.

1. Low power foam fire extinguishing system:
Low-power foam fire extinguishing systems are classified according to different ways of use: low-power foam fire extinguishing systems, foam-sprinkler fire extinguishing systems.
Low-power foam fire extinguishing system is suitable for processing, storing, loading and unloading, and using A (except liquefied hydrocarbons), B and C liquids. Such as: oil fields, refineries, chemical plants, railway tank car crane trestle bridges, docks, underground garages, hangars, airports, oil boiler rooms and other places.
1. Low multiplex foam fire extinguishing system
Low-power foam fire extinguishing system is mainly composed of fire pump, foam proportional mixing device, foam generator, foam spout, deluge valve, and other valves and pipe fittings. A certain pressure of fire water is mixed with the foam liquid by the foam proportional mixing device to form a certain proportion of foam mixture, and the air foam is generated by the foam generator, which flows down the wall of the protective tank by the foam spout and covers the surface of the combustion liquid, thereby suffocating and extinguishing the fire.
2. Foam sprinkler fire extinguishing system (foam-water spray automatic fire extinguishing system)
In the automatic sprinkler system, equipment that can supply foam mixture is configured to form a fixed fire extinguishing system that can spray both water and foam. It can be an open or closed system. This system was used relatively early in Shenzhen, when there is a fire, the fire detector installed in the protected area has a signal transmitted to the control cabinet, the glass ball of the closed nozzle is cracked and sprayed, at this time, manual or automatic opening of the deluge valve, fire pump, pipeline valve, the system works. The pressure fire water is mixed with the foam liquid by the foam proportional mixing device to form a certain proportion of foam mixture, and the air foam is generated by the nozzle to achieve the fire extinguishing effect. The foam sprinkler fire extinguishing system is mainly composed of fire pump, foam proportional mixing device, sprinkler, water flow indicator, wet alarm valve, rain shower valve and other valves, pipelines, etc.
Note: 1. According to the mode of use, it can be divided into: open foam sprinkler fire extinguishing system and closed foam sprinkler fire extinguishing system.
2. The system nozzle can use both foam nozzle and water sprinkler head.
3. When the sprinkler is selected, it is necessary to use water-forming film foam liquid or film-forming fluoroprotein foam liquid.
4. Foam-water spray combination system is also called ZP system, ZP32 is an automatic foam spray system with a mixed liquid flow rate of 32L/s.
5. 7.3.1/.2 of the Code for Fire Prevention of the Design of Car Garages, Garages and Parking Lots stipulates: "Class I underground garages and Class I garages should be equipped with foam sprinkler fire extinguishing systems. The design of the foam spray system and the selection of foam liquid should be implemented in accordance with the provisions of the current national standard "Code for the Design of Low Power Foam Fire Extinguishing System". ”　

2. High multiple, medium power foam fire extinguishing system
1. Scope and place of application
Medium and high multiples foam fire extinguishing system is suitable for fighting Class A and Class B fires, limited enclosed space fires, and controlling liquid fires of liquefied petroleum gas and liquefied natural gas.
Such as: solid substance warehouse, flammable liquid warehouse, industrial plants with fire hazard, underground construction projects, engine rooms, pump cabins, cargo holds, etc. of various ships, valuable instruments and materials, flammable and flammable liquids and liquid fires of liquefied petroleum gas and liquefied natural gas.
2. System composition
High multiple, medium multiple foam fire extinguishing system is mainly composed of fire pump, foam proportional mixing device, foam generator, valve, pipeline, etc.