Fire hydrant: A device connected to the fire water supply system or water supply system, with an on-off valve and one or more outlets that are used to supply water to fire hoses or fire trucks. Fire hydrants are divided into indoor fire hydrants and outdoor fire hydrants.
When the indoor and outdoor fire hydrants are directly supplied by the municipal water supply pipe, and an independent fire water supply system is used, a backflow preventer should be installed at the interface with the municipal water supply pipe network.
The water filling time of the dry hydrant system should not exceed 5 minutes.
The number of outdoor fire hydrants should be determined according to the comprehensive calculation of the protection radius of the fire hydrant and the water consumption of outdoor fire hydrants. , can be included in the number of outdoor fire hydrants.
Outdoor fire hydrants should be evenly arranged around the high-rise building, and should not be centrally arranged on one side of the building.
An outdoor fire hydrant should be installed before the backflow preventer for the household pipe from the municipal water supply network.
The application valve of the fire water supply pipe network is divided into several independent sections, and the number of fire hydrants in each section should not exceed 5.
The distance between the outdoor fire hydrant and the fire pump adapter should not be less than 15m, nor more than 40m.