1, large class, class A or other theaters with more than 1500 seats; A hall or auditorium with more than 2000 seats; A gymnasium with more than 3,000 seats; Indoor staff lounge and equipment room of a stadium with more than 5000 people.

2. Exhibition buildings, shops and hotel buildings with a building area of more than 1500m2 or a total building area of more than 3000m2, as well as ward buildings, outpatient buildings and operating departments with the same building scale in hospitals; Underground shops with a building area of over 500m2.

3. An office building with a return air duct (pipe) and a total construction area of more than 3000m2.

4, set in the underground, semi-underground or above four floors, or set in the first floor, second floor, third floor and any floor of a building with a construction area of more than 300m2 (except swimming places).

5. Libraries with more than 500,000 books.

Extended data

Principle of automatic sprinkler system

Dry system is similar to wet system, but the structure and action principle of control signal valve are different. The main control signal valve is arranged between the water distribution pipe network and the water supply pipe to separate them, and the water distribution pipe network is usually filled with pressurized gas for system startup.

In case of fire, the nozzle ejects gas first, which reduces the pressure in the pipe network. The pressure water in the water supply pipe opens the control signal valve to enter the water distribution network, and then it is sprayed from the nozzle to extinguish the fire. However, the system needs an additional set of inflatable equipment, which has high one-time investment, complicated management and slow fire extinguishing speed.

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