Fire hydrants for modular and tower houses should be located in the stairwell on the first floor and the rest platforms on each floor. When it is really difficult to set up two fire risers, 1 fire riser can be set up, but double-port and double-valve fire hydrants must be used.
Two fire hydrants should be set in the front room of the fire elevator room;
3 Indoor fire hydrants should be set in obvious positions and easy to operate. The height of the bolt mouth from the ground or operating base surface should be 1. 1m, and its outlet direction should be downward or at a 90-degree angle with the wall where the fire hydrant is installed; The distance between the bolt mouth and the inner edge of fire hydrant box should not affect the connection of fire hose;
The fire hydrant in the cold storage should be set in the hall or stairwell at room temperature;
5 The distance between indoor fire hydrants should be determined by calculation. The distance between indoor fire hydrants in high-rise workshops (warehouses), elevated warehouses and Class A and B workshops should not be greater than 30m；; Other single and multi-storey buildings indoor fire hydrant spacing should not be greater than 50m；;
6 Fire hydrants, water guns and hoses with uniform specifications should be used in the same building. The length of each hose should not be greater than 25m；;
7 Indoor fire hydrants shall be arranged to ensure that the full water column of two water guns on the same floor of each fire zone reaches any part at the same time. For multi-storey warehouses with a building height of 24m or less and a volume of 5000m3 or less, 1 water gun can be used to enrich the water column and reach any part of the room.
8 For buildings such as high-rise factory buildings (warehouses) where the static pressure of high-rise fire water tanks can not meet the water pressure requirements of the most unfavorable fire hydrants, a button for directly starting the fire water pump should be set at each indoor fire hydrant, and protective facilities should be set;
9 when the outlet pressure of indoor hydrant bolt mouth is greater than 0.5MPa, decompression facilities should be set up; When the hydrostatic pressure is greater than 1.0MPa, the zonal water supply system should be adopted;
10 buildings with indoor fire hydrants, such as flat roofs, should be equipped with fire hydrants for testing and inspection.
Extended data
1, municipal fire hydrants and outdoor fire hydrants in buildings shall adopt wet fire hydrant system.
Description: The pipeline of the wet fire hydrant system is a system filled with pressurized water. High-pressure or temporary high-pressure wet hydrant system can be used to directly extinguish the fire. The low-pressure system can supply water to the fire truck, and the fire truck equipment can be used for fire fighting. Compared with the dry fire hydrant system, the wet fire hydrant system has no water filling time, and can quickly get out of the water, which is beneficial to fire extinguishing.
2. In places where the indoor ambient temperature is not lower than 4℃ and not higher than 70℃, wet indoor fire hydrant system should be adopted.
Description: Indoor ambient temperature is often lower than 4℃, which will make the water in the pipe freeze, and the water in the pipe above 70℃ will intensify vaporization and damage the pipeline and accessories. In addition, freezing and vaporization will reduce the water supply capacity of the pipeline, leading to the reduction or disappearance of fire extinguishing capacity, so this temperature is taken as the environmental temperature condition for choosing wet hydrant system or dry hydrant system.
3. In places where the indoor ambient temperature is lower than 4℃ or higher than 70℃, dry fire hydrant system should be adopted.
4. When it is really difficult to set indoor wet fire hydrant system in multi-storey residential buildings with a building height of less than 27m, dry fire standpipe, SN65 indoor fire hydrant interface and fire pump adapter without check valve and gate valve can be set.
5. For the fire hydrant system of urban tunnels and other structures in freezing areas such as severe cold and winter cold, anti-freezing measures should be taken, and dry fire hydrant system and dry outdoor fire hydrant should be adopted.
Note: When outdoor structures such as urban tunnels and bridges need to be equipped with fire hydrants, when the outdoor extreme temperature is lower than 4℃, the dry hydrant system should be adopted because the system pipeline may freeze, and the outdoor dry hydrant system can be directly connected to the municipal water supply pipeline.
References:
Baidu encyclopedia-fire hydrant