Hunan fire foam sprinkler PTW | Changde foam sprinkler | Shaoyang fire sprinkler

- dd -, Introduction
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The foam nozzle is a fire extinguishing equipment that generates and sprays air foam. The foam mixture is transported to the foam nozzle through the pipeline, and air is sucked in at the outlet of the foam nozzle to form air foam. Spraying in protected dangerous areas to extinguish fires is mainly used in low-expansion foam sprinkler systems.

Principle of fire extinguishing
When the foam mixture with a certain pressure flows through the inner cavity of the foam nozzle, the flow rate increases due to throttling and the pressure decreases to form a negative pressure and suck air through the nozzle. The dispersion effect forms a certain multiple of air foam to extinguish the fire.
- dd -, technical characteristics
- dd - A fixed fire extinguishing system that uses nozzles to spray foam is called a foam sprinkler system.
- dd - Foam sprinkler fire extinguishing system is suitable for places where Class A, B, and C liquids may leak and fire-fighting facilities are insufficient. In addition to fire extinguishing, the foam sprinkler system can also:
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① Have a cooling effect on protected objects
② Reduce heat radiation to other facilities other than fire
③ Extinguish and control the initial stage of liquid fire that spreads to the ground. Foam sprinkler fire extinguishing systems are not suitable for water-soluble liquids exceeding depths.
Foam spray systems are generally divided into air-suction type (referred to as suction type) and non-suction air type (referred to as non-suction type). When using a suction-type foam nozzle, you should use protein foam liquid, ambient protein foam liquid, aqueous film-forming foam liquid or fluoroprotein-resistant foam liquid D. When using a non-aspiration type foam nozzle, you must use an aqueous film-forming foam liquid.
When protein foam liquid or ambient protein foam liquid is used to protect non-water-soluble Class A, B, and C liquids, the supply intensity of the foam mixture should not be less than /(d) The continuous supply time should not be less than. The foam spray supply intensity and continuous supply time are also formulated based on domestic tests and relevant foreign standards.
The foam spray system should be equipped with an automatic alarm device. The system should adopt automatic control but must be equipped with manual control device. The purpose of setting up a foam sprinkler system is to promptly and effectively extinguish or control initial fires to avoid the spread of fires. However, automatic control does not completely follow people's wishes and sometimes fails, which requires a manual auxiliary control device.