The main purpose of the pump adapter is when the fire pump in the room fails or there is not enough fire fighting water in the fire room for the fire truck to take water from the outdoor fire hydrant and send the water to the indoor fire water supply pipe network for extinguishing fire through the pump adapter. Below with my years of design experience to talk about some of the pump adapter settings.
First, the pump adapter set up in the fire district
According to the "high regulation" provisions, in the fire truck water pressure within the scope of each division are required to set the pump adapter. Building height of more than 50m previously considered part of fire engines could not get help, you can consider not set the water pump adapter, but with the fire technology updates and equipment development, many cities have been equipped with high-powered fire engine, fire water supply has been far Far beyond the 50m, should no longer be 50m as a pump adapter set whether the boundaries.
When the fire fighting system vertical partition, the partition pump adapter settings can be considered merger, do not have to set. In some designs, the pump adapter is disposed in front of the pressure reducing valve to reduce the water supply of the urban fire truck artificially. This may cause the pressure of the fire protection system in some floors to be satisfied, but may not be satisfied by decompression , Very bad for fire fighting.
The low zone pump adapter should be located after the pressure relief valve. For the low-zone hydrant system, the lower hydrant for the decompression regulator fire hydrant, and low-zone self-blasting firefighting system, the lower zone of the lower layers are set decompression valve, the other low-pressure pipe network pressure Capacity can also be increased according to the height of the building to 1.6MPa or 2.5MPa, and currently large and medium-sized city fire engines equipped with a pump lift of 1.12 ~ 1.37MPa, so the low zone pump adapter is located in the valve does not appear after Overpressure problem. Combined pumps in all areas can be set by the check valve to prevent high zone pressure to the low zone.
Second, the pump adapter spray from the fire system settings
In the self-extinguishing fire system, the pump adapter can be directly connected to the wet alarm valve. When the fire engine arrives at the scene and pumps water into the house through the pump adapter, the fire is a known situation. There is no need to start the pressure relay and the hydraulic alarm bell again, and do not need to restart the fire pump and other facilities again.
Third, the pump adapter and fire pool distance
According to fire code requirements, the pump adapter and outdoor fire hydrant or fire pool distance should be 15 ~ 40m. Fire Ponds should store all indoor and outdoor fire-fighting water during fire-fighting (if there is a reliable source of water supply, ie firefighting pools can consider subtracting supplemental parts when the building has urban bidirectional water supply), the outdoor fire hydrant is only Auxiliary backup measures. In this case, the pump adapter and fire pool distance should be controlled at 15 ~ 40m, or take the water will be difficult. In addition, taking into account the turning radius of the fire truck, the pump adapter spacing should not be too close, otherwise the fire truck water will appear mutual interference situation. This creates a contradiction: Suppose the flow of each pump adapter is 10-15L / s, if the indoor fire hydrant water consumption is 40L / s, self-extinguishing water consumption 26L / s buildings need to set 5 sets Pump adapter, coupled with the engineering conditions are limited, to do the pump adapter from the fire pool less than 40m, but not too close to each other, which is not an easy task.
How to solve this problem? I suggest to set fire outside the building dedicated loop pipe, on which to set the outdoor fire hydrant, one of the outdoor fire hydrant and fire pool water intake no more than 40m, fire in the city if the water pipe network, fire engines Can be taken from the water intake outlet outdoor fire network; similar to the relay mode, the fire truck and then from other outdoor fire hydrant on the water, through the pump adapter to the building. Municipal water supply should be set to take over the anti-pollution air cut-off valve to prevent fire water back to pollution municipal water supply pipe network. If the fire, such as municipal pipeline damage, outdoor fire hydrants can still play a role, the pump adapter and water intake or outdoor fire hydrant distance can be controlled within the range of 15 ~ 40m.
Fourth, the number of pump adapters and outdoor fire hydrant relationship
According to fire regulations, outdoor fire hydrant quantity according to the outdoor fire fighting water consumption, each outdoor fire hydrant water is 10 ~ 15L / s; water pump adapter according to the indoor fire hydrant water supply system indoor fire water and automatic sprinkler system water and Determine, each pump adapter flow rate by 10 ~ 15L / s calculation. When the indoor fire water consumption is greater than the outdoor fire fighting water, the appearance of the outdoor fire hydrant less than the number of pump adapters, and when the fire during the fire service system failure, the pump adapter to be completed from the outdoor fire pit or outdoor fire hydrant Transfer all indoor fire fighting water tasks, so the number of outdoor fire hydrants should be determined by the number of pump adapters, outdoor fire hydrant and pump adapter should be one to one correspondence. In addition, the best number of fire water intake is not less than two, so you can reduce the number of outdoor fire hydrants.
Fifth, on the safety valve settings
In order to prevent overpressurization of the fire protection pipeline, a safety valve should be installed in the fire protection system. In the fire hydrant and nozzle is not open, if the fire pump malfunction, or the initial fire only a small amount of fire hydrant, when the nozzle is turned on, that is, when the flow is zero or very small, there will be high-lift situation, the system may overpressure, resulting in Pipeline damaged. The author suggests that the pump adapter be used with the style of the safety valve inside, so as to save the pipe fittings and make the entire fire protection system safe and reliable, thus preventing overpressure of the pipe network.
Anti-Static Ptfe Coated Fiberglass Fabric,High Temperature Resistance Coated Fiber Cloth,Black Ptfe Coated Fiber Fabric,Chemical Resistance Ptfe Fiber Fabric
Taixing Yingxing Composite Material Co.,Ltd , https://www.ptfecnyx.com