There is a section of horizontal pipe with DN400 diameter; what type of pump is suitable for pumping water through it?
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It is a section of horizontal pipe with a diameter of DN400, approximately 3.5 meters in height; the water in it flows by gravity, and the amount of water present is unstable – the pipe is often not filled to capacity. There is an underground tank 100 meters away from this pipe, and since it is necessary to cross a road, this pipe makes a U-shaped turn in order to reach the tank. The water flows into the pool very slowly; what kind of pump can be used to speed up the drainage?
Where does the water come from? U-bends should not be installed in the water supply pipes
You can consider using a centrifugal pump to speed up the water drainage. Centrifugal pumps are suitable for transporting large volumes of water, and they possess high suction and discharge capacities. Based on the situation you described, you can choose a suitable centrifugal pump with a DN400 diameter to increase the water discharge rate. At the same time, you need to ensure that the pump’s outlet is properly connected to the pipeline in order to make full use of the pump’s drainage capacity. It is worth noting that the selection and installation of pumps should be based on the specific requirements of the project; it is recommended that you consult a professional engineer for more detailed advice. .
A centrifugal pump with a flow rate of 300 cubic feet per minute will be sufficient
However, this is a pipeline that is not frequently full. I don’t know either when it will be full.
Since it’s necessary to cross the road, it has to be done by going underground
An axial pump similar to an axial flow fan is installed inside the pipeline to provide some power. I’m not sure if such a pump exists
Attach a pipe with a booster pump below the U-turn.
Add a centrifugal pump; no gas should be present at the inlet of this pump. Therefore, a reservoir or water storage tank should be installed at the source of the water supply. A level switch can be used to ensure that the pump starts automatically when the water level reaches a certain threshold. The initial investment is higher, but the pump does not need to run continuously, which results in energy savings
This post was last edited by pzhmotor on 2023-6-25 at 15:56. The flow rate of the overflow tube is determined by the pressure difference between the inlet and outlet; the effect of the U-shaped bend is that blockages tend to occur inside it, resulting in a reduced flow area. A DN400 pipe is not small; if gravity flow can meet the flow requirements, it’s best not to use a pump. (There’s no need to spend this money; it’s a waste of electricity.) It is recommended to check the natural flow rate and the height difference to see if the pipe diameter meets the requirements for overflow, and considering changing the pipe may be an option. (Changing the pipeline requires a larger investment but is simpler to handle.) If that’s not possible, add a bypass at the inlet and install an axial flow pump (characterized by high flow rate, low head, and low efficiency), which can be flushed regularly. After flushing, close the inlet and outlet of the axial flow pump, making use of the height difference as much as possible. Regarding the centrifugal pump mentioned above, unless you restrict the pump outlet very tightly, it is highly likely to experience overflow (the head cannot be that low).
Drawing a schematic diagram might make it easier to understand. The pressure difference on both sides of the U-tube poses a challenge in terms of resistance; increasing the pressure in the pipe at the front of the U-tube should help.