What is a fire hydrant?

Fire hydrant is a fixed fire control facility, whose main function is to control combustible substances, isolate combustion-supporting substances and eliminate fire sources. There are indoor hydrants and outdoor hydrants. Fire hydrant group is generally composed of fire box, fire hose, water gun, interface, bolt and clip. Fire hydrants are mainly used for fire engines to take water from municipal water supply network or outdoor fire water supply network to extinguish fire, and can also be directly connected with hoses and water guns to extinguish fire.

Installation points Fire hydrant: a device connected with fire water supply system or water supply system, with on-off valve and one or more outlets, used to supply water to fire hose or fire truck. Fire hydrant is divided into indoor fire hydrant and outdoor fire hydrant.

When indoor and outdoor fire hydrants are directly supplied by municipal water supply pipes and an independent fire water supply system is adopted, a backflow preventer should be set at the interface with the municipal water supply pipe network.

The water filling time of dry hydrant system should not exceed 5 minutes.

The number of outdoor fire hydrants should be determined by comprehensive calculation according to the protection radius of fire hydrants and the fire water consumption of outdoor fire hydrants. The water output of each outdoor hydrant is calculated as 15L/s, and municipal hydrants with a distance of 5 ~ 40m from the protected object can be included in the number of outdoor hydrants.

Outdoor fire hydrants should be evenly arranged around high-rise buildings and should not be concentrated on one side of the building. The number of outdoor fire hydrants on one side of high-rise buildings should not be less than two.

Outdoor fire hydrants should be set in front of the backflow preventer of the household pipeline from the municipal water supply network.