7.4.6. 1 Fire hydrants should be located in places that are obviously accessible, such as walkways and stairs. The distance between fire hydrants should ensure that the water guns and water columns of two fire hydrants reach any part of the same floor at the same time.

7.4.6.2

The full water column of fire hydrant nozzle should be determined by hydraulic calculation, and the high-rise building with the building height not exceeding 100m should not be less than100m; High-rise buildings whose building height exceeds 100m should not be less than 13m.

7.4.6.3

The fire hydrant spacing should be determined by calculation, and the high-rise building should not be more than 30m, and the podium should not be more than 50m.

7.4.6.4

The height of hydrant bolt mouth from the ground should be 1. 10m, and the outlet direction of hydrant bolt mouth should be downward or perpendicular to the wall where hydrant is installed.

7.4.6.5

The hydrostatic pressure of the hydrant spigot should not be greater than 65438 0.00 MPa, and when it is greater than 65438 0.00 MPa, the zonal water supply system should be adopted. When the pressure of hydrant bolt mouth is greater than 0.50MPa, decompression measures should be taken.

7.4.6.6

Fire hydrants should have the same model and specification. The diameter of hydrant spigot is 65mm, the length of hose is not more than 25m, and the diameter of nozzle of water gun is not less than19mm.

7.4.6.7

Each hydrant of the temporary high-pressure water supply system shall be provided with a button for directly starting the fire pump and facilities for protecting the button.