The pressure stabilizing pump is a kind of fire pump, which is used to actively spray water to extinguish the fire and stabilize the pressure of the water supply system of the fire hydrant, so as to ensure the pressure state before and after the water pressure of the system. Once the shower head or fire hydrant flows out, it can flow out the water volume and water pressure required to meet the fire water. Both pressure stabilizing pump and capacity increasing pump are capacity increasing facilities. The pressure stabilizing pump operates when the shower head and fire hydrant have not flowed out, and the capacity increasing pump operates when the shower head and fire hydrant have flowed out, and the water pressure of fire water is surplus, so it is necessary to increase the water pressure.
China's current standard"standard for fire protection design of high rise civil buildings" (gbj50045-95) (hereinafter referred to as "high standard") has secondary regulations for capacity increasing facilities (including pressure stabilizing pump): "7.4.8.1 the water output of capacity increasing pump shall not be greater than 5L/s for fire hydrant water supply and 1L/s for main sprinkler fire extinguishing." There are preconditions for a certain regulation. One of the conditions is that the fire water supply is fragmentary and non-pneumatic water tank; the second condition is that the small amount of leakage of indoor fire water supply is important in the sealing part of the water pump. The regulation of the article does not mean that the stabilized pressure pump is determined according to a certain flow under any condition, any condition and any time.
The capacity increasing pump referred to in the high regulation refers to both the capacity increasing pump and the pressure stabilizing pump for pressure stabilization. The standard provisions are not divided. Theoretically, the function and performance of the capacity increasing pump and the pressure stabilizing pump are different, and their flow values are not the opposite.
The capacity increasing pump is used to discharge the shower head and fire hydrant, and the water pressure of fire water is surplus. It is necessary to increase the water pressure capacity to meet the water pressure requirements of fire water. At that time, the flow of the booster pump shall ensure the outlet flow of a shower head or a fire hydrant, that is, not less than 1L/s or 5L/s. However, once the capacity increasing pump is started, the main fire pump is also started subsequently. The role of the capacity increasing pump is not very urgent and redundant.
The pressure stabilizing pump is opposite to the capacity increasing pump, which is used to ensure the pressure working conditions before and after the self-spraying system and the fire hydrant system. Once it flows out, it can meet the water pressure and water volume requirements of fire water. Its function error is often obvious, so the capacity increasing water pump referred to in the standard essentially refers to the pressure stabilizing pump, especially the pressure stabilizing pump of active sprinkler system.
The flow value of pressure stabilizing pump depends on many components, among which the more important components are:
(1) Category of parts: when the pressure stabilizing pump uses parts from the spray, think about the amount of water in a shower head; when it is used for fire hydrants, think about the water volume of a fire hydrant.
(2) Whether there is a pneumatic water tank system setting. When there is no pneumatic water tank system setting, the flow of the pressure stabilizing pump shall not be greater than the water volume of a shower head or a fire hydrant. When the pneumatic water tank is equipped, the piecemeal water supplement and pressure guarantee are implemented by the pneumatic water tank. As long as the flow of the pressure stabilizing pump meets the flow requirements of the pneumatic water tank, that is, the flow of the pressure stabilizing pump should consider the composition of the regulating volume of the pneumatic water tank. At this time, the flow of pressure stabilizing pump shall be cost effectively determined according to the total volume of atmosphere and water in the tank of pneumatic water supply facilities and the volume of water in the tank. The water output of the pump shall not be less than 1.2 times of the maximum hourly flow of the pipeline network when the tank is under uniform pressure.
The provisions of the high regulation do not have the regulations that the air pressure water tank must be equipped, but without the air pressure water tank, the pressure stabilizing pump starts frequently and is easy to be damaged; with pneumatic water tank, the pressure stabilizing pump starts frequently, the problem can be alleviated, and the guarantee of piecemeal pressure stabilizing conditions can be better reflected. However, it is necessary to increase the cost of the pneumatic water tank. Under normal conditions, the volume of the pneumatic water tank equipped with the system does not need to be too large, and the volume should be less than 50L. Shanghai has compiled the standard atlas of setting up pneumatic water tank for pressure stabilizing pump matching system, which is compiled by Shanghai Haiying machinery factory.
(3) Fragmentary scale: quasi-low-pressure water supply fragmentary (or stable low-pressure water supply fragmentary) with pressure stabilizing pump, ranging from indoor to indoor and outdoor. The indoor quasi-low pressure water supply is fragmentary, the pipe adopts steel pipe, and the interface adopts screw buckle, flange or riveting connection. The fragmentary leakage of the pipe network mainly occurs in the sealing part of the water pump, and its unit is absolutely unlimited. The indoor and outdoor quasi low pressure water supply is fragmented, because the outdoor pipe adopts cast iron pipe, the interface adopts socket connection, and the interface seal adopts rubber ring. The scale of the pipeline network is large, and the interface leakage accounts for a relatively percentage of the whole leakage. After the ballistic construction, the soil will continue to be recovered. Sometimes the interface part is reinforced with concrete support. Even if there is leakage, it is difficult to take remedial measures. All these indicate that when the quasi-low-pressure water supply system is adopted indoors and outdoors, the flow of the pressure stabilizing pump should have residual room.
In general, the flow of pressure stabilizing pump should be adjusted according to the opposite situation.
