Key points for the selection of outdoor fire hydrants：
1. When the building is within 150m of the protection radius of the municipal fire hydrant, and the fire water consumption does not exceed 15L/s, the outdoor fire hydrant may not be installed.
2. Outdoor fire hydrants should be evenly arranged around high-rise buildings and should not be concentrated on one side of the building.
3. The distance between the outdoor fire hydrant of the civil air defense project and the entrance of the civil air defense project should not be less than 5m.
4. The outdoor fire hydrants of the parking lot should be arranged along the periphery of the parking lot, and the distance from the nearest row of cars should not be less than 7m, and the distance from the gas station or garage should not be less than 15m.
5. Outdoor fire hydrants should be installed in places convenient for fire trucks.
6. Outdoor fire hydrants should be above ground. When underground fire hydrants are used, there should be obvious signs. The underground type should be used in cold areas, and the above-ground type should be used in non-cold areas. The above-ground type can be used as an anti-collision type if conditions permit.
7. Outdoor above-ground fire hydrants should have one spigot with a diameter of 150mm or 100mm and two hydrants with a diameter of 65mm. Outdoor underground fire hydrants should have a spigot each with a diameter of 100 and 65 mm.
8. The protection radius of outdoor fire hydrants should not exceed 150m, and the spacing should not exceed 120m.
9. The outdoor fire hydrant should not be more than 2m away from the roadside, and should not be less than 5m away from the outer wall of the house.