Deep well pump
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Dear sea friends: The well depth is 35m, the pressure at the pump outlet (at ground level) is 0.2 MPa, and the rated head is 80m. Can we reduce the flow rate by closing the outlet valve in order to lower power consumption?
Why should the outlet valve be closed? When the outlet valve is closed, the flow rate decreases while the head increases. Do the performance parameters meet the requirements after closing the outlet valve? If closing the outlet valve is done solely for energy savings, then compared to this approach, reducing the diameter of the impeller is a more direct and effective solution.
The head of the water pump differs too much from the actual requirements, resulting in overload during operation. The valve can be turned down to limit flow (as a temporary solution); the most fundamental solution is to replace the pump.
Well, for this setup, there is an automatic control cabinet; during use, it regulates the maximum flow rate by controlling the outlet valve to keep the current within the specified range, and it sets the opening degree of this outlet valve so that it cannot be changed. Otherwise, the excess current will cause an increase in current that leads to tripping. As for the system shutting off water supply, the control box will handle it automatically.
Pumps are characterized by two fundamental parameters: flow rate and head. Based on your description, the pump’s head is sufficient; if you simply want to reduce the flow rate, you can easily do this by closing the outlet valve.
It’s best to cut the impeller. Closing the valve to reduce consumption has little effect, and it also affects the pump’s lifespan.
We produce domestic and process water, and its flow varies significantly depending on the season and day/night; currently, any excess water is discharged as overflow. The outlet valve was closed to limit flow once before; the pump operated for a long time as well, which caused the bearings to get damaged. It’s not clear whether this was caused by closing the outlet valve, and no one tried it again afterward
Indeed, after equipping our deep well pump with an inverter-driven pump, vibration becomes severe at low speeds
Does it stop working again when an increase in dosage is needed?
Yes. It’s up to you to decide; if you only increase the amount occasionally, I personally think it’s better to cut it.