To prevent changes in water level from affecting the flow rate of the pump, would adding a pressure stabilizing tank be sufficient?
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As the title suggests, I want to draw a certain volume of water from a tank without having the water level changes affect the pump’s flow rate. The simplest approach now is to increase the area of the tank, so that when a certain volume of water is drawn out, the difference in water level becomes negligible. If the area cannot be increased too much, can a pressure stabilizing tank solve this problem? Are there any other better methods?
If the pump is not cavitating, why does the flow rate change?
I work in the field of instruments, so I’m not very familiar with pumps. I think that as the water level changes during pumping, the head pressure should change as well; since the inlet pressure of the pump changes, wouldn’t the water flow rate also change?
What is the pump’s head, and how much does the water level change? If the pump head is not high and the water level changes significantly, it will affect the flow rate. If the pump head is sixty to seventy meters, the liquid level changes by two to three meters. When the pump is not cavitating. The traffic volume remains relatively stable.
This post was last edited by Perfey on 2018-8-14 at 10:00. Here’s the situation: I want to keep the water flow within a range of ±2%, and the head pressure should be around ten meters or so. If I want to maintain a stable flow rate, must the difference in water levels not exceed 2%? The maximum volume of water that can be pumped out at one time might reach 100 M3; therefore, to control the water level, the area of the reservoir needs to be quite large. So I’m wondering if there are other ways to address the issue of stable traffic? The water flow rate should be over 10,000 cubic meters
Then use variable frequency control, set it to automatic mode, and adjust the frequency based on the outlet flow rate.
Would that mean the output traffic would be guaranteed? Is that phone number below your WeChat ID?
Several concepts are incorrect. 1. Head is an inherent parameter of a pump; it represents the increase in energy of the fluid after passing through the pump. It is an incremental value that relates only to the pump’s performance and has nothing to do with the liquid level. 2. If the pump is above the liquid level, then changes in liquid level affect the suction lift, rather than the head.
The original poster is overthinking it; changes in liquid level will affect the pressure at the pump inlet as well as the net positive suction head. If the outlet conditions remain unchanged, then the flow rate and head will not change. Pump water out of the tank and then create a pressure stabilizing tank; how does the water get into that tank? And what about using a pump?
There is basically no impact; flow rate and head are related to each other, and the water level provides compensation for the self-priming capacity. For pumps used with tanks, this factor can be ignored