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Several Problems in the Design of Fire Pump Adapter
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. 1. Pump adapter set up in the fire district according to the "high regulation" requirement, in the fire truck water pressure within the scope of each division are required to set the pump adapter. In the past, buildings with a height of more than 50 m could not be helped by a fire engine, and pump adapters could not be installed. However, with the update and development of fire-fighting technology and equipment, many cities are already equipped with high-powered fire engines and the fire service has been far behind 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. In my opinion, the low area pump adapter should be located in the valve after. For the low-zone hydrant system, the lower hydrant for the decompression regulator fire hydrant, and low-zone self-blasting firefighting system, the lower part of the lower zone are set decompression stabilizing valve, the other low-pressure pipe network 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 engine equipped with a pump lift of 1.12 ~ 1.37 MPa, 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. 2. Pump adapter self-blasting firefighting system set in the self-extinguishing fire extinguishing system, the pump adapter can be directly connected to the wet alarm valve. When the fire engine arrives at the scene to pump water from the fire-fighting pipe network through the pump adapter, the fire is a known situation and there is no need to start the pressure relay and the hydraulic alarm bell again, nor restart the fire pump and other facilities. 3. The distance between the pump adapter and the fire tank should be 15 ~ 40m according to the requirements of the fire protection code. The distance between the pump adapter and the outdoor fire hydrant or fire-fighting water tank 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, that is, when a building has urban two-way water supply, the fire pit can consider subtracting the refillable portion). At this time, 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, and if the indoor fire hydrant water consumption is 40L / s, it is necessary to set the building from which the fire prevention water consumption is 26L / s Set of pump adapter, coupled with the engineering conditions are limited, to do the pump adapter away from the fire pool not more than 40m, but not too close to each other, this 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 pit water intake no more than 40 m, fire in the city if the water pipe network, fire The car can take water from the intake after the supply of outdoor fire fighting pipe 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 to use. 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. 4. Pump adapter and the relationship between the number of outdoor fire hydrants According to fire regulations, the number of outdoor fire hydrants to determine the amount of outdoor fire water, each outdoor fire hydrant water is 10 ~ 15L / s; water pump adapter according to the indoor fire hydrant water system indoor fire water The amount of water and automatic sprinkler system to determine the sum of water, each pump adapter flow rate by 10 ~ 15L / s calculation. When the indoor fire water consumption is greater than the outdoor fire fighting water, there is less than the number of outdoor fire hydrant splicer, and when the fire during the indoor fire water 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. The author suggests that the sprinkler system and the fire hydrant system pump adapter should be marked separately (when the sprinkler system and the fire hydrant system separately set), in order to facilitate the fire truck targeted pressure, thus saving the fire extinguishing time. 5. About the setting of safety valve To prevent overpressurization of the fire protection piping, 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.