Pressure type foam proportioning device application of fire extinguishing system
By foam expansion foam fire extinguishing systems are classified as: low-expansion foam fire extinguishing systems, foam multiples below 20 times; in multiple foam fire extinguishing systems, foam multiple of 20 to 200 times; high-expansion foam fire extinguishing systems, foam multiples of 200 ~ 1000 times.
A low-expansion foam fire extinguishing system:
Low expansion foam fire extinguishing system by using different methods are classified as: low-expansion foam fire extinguishing systems, foam – Spray Extinguishing system.
Low expansion foam fire extinguishing system is suitable for processing, storage, handling, use of a (except for liquid hydrocarbons), B, C and liquids. Such as: oil, oil refineries, Chemical industry Factory, railway tank car of the crane pipe trestle, pier, underground garage, hangar, airport, oil-fired boiler room and other places.
1. Low-expansion foam fire extinguishing system
Low expansion foam fire extinguishing system consists of Pump , Foam proportioning equipment, foam generators, foam nozzle, rain valves, and other valves and tubes and other components. After some pressure foam proportioning fire water and foam liquid mixing device to form a certain proportion of the bubble mixture, generated by the bubble of air bubbles, the bubble vents to protect the tank wall along the shed, covering the surface of burning liquid to suffocate fire.
2. Foam sprinkler system (foam – water spray Automatic fire extinguishing System)
Automatic sprinkler system in the configuration of equipment supply foam mixture to form a bubble can spray can spray fixed fire extinguishing system. It can be open systems, closed systems can be. The system used in Shenzhen early, when Fire Occurs, the installation of fire detectors in the protected areas have spread the signal control cabinet, closed rupture of water-jet nozzle of the glass ball, this time, manually or automatically open the deluge valve, Fire Pump , Pipe valve, the system work. Pressure fire water by foam proportioning device with the foam liquid mixture to form a certain proportion of the bubble mixture, air bubbles generated by the nozzle to fire effects.
Foam sprinkler system is composed of fire pumps, foam proportioning device, nozzle, water flow indicator, wet Alarm Valve, deluge valve and other valves, piping and other components.
Note: 1. According to usage can be divided into: open-closed foam sprinkler system and foam sprinkler system.
2. The system can use a foam spray nozzle, sprinkler head can also be used.
3. Elected to use the sprinkler head, you must use AFFF foam solution or liquid film F protein.
4. Foam – combined with the water spray system, also known as ZP system, ZP32 is the mixture flow rate 32L / s automatic foam spray system.
5. "Garage, repair garage, parking lot for fire protection design," 7.3.1/.2 stipulated: " type underground garage, type repair garage should set the foam sprinkler system. Foam spray system design, selection of bubble solution should be the current national standard "low-expansion foam fire extinguishing systems," the provisions. "
Second, high-expansion, the expansion foam extinguishing system
1. Application and place , The high-expansion foam fire extinguishing system suitable for fighting Class A, B class fires, limited closed space fire, control of liquefied petroleum gas, liquefied natural gas in the flow of fire.
Such as: solids storage, flammable liquid storage, there is a fire risk of industrial plants, underground construction, a variety of ship engine room, pump rooms, cargo, etc., valuable equipment and materials, flammable liquids and liquefied petroleum flammable gas and liquefied natural gas flow of fire.
2. System components
High multiple, multiple foam fire extinguishing system in the main by the fire pump, foam proportioning equipment, foam generators, valves, piping and other components.
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