Seeking help with a question regarding submersible pumps
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The submersible pump used for water supply at home is connected to a pressure tank with a capacity of 1.5 cubic meters; the water is drawn from this pressure tank. When the pressure tank runs out of water, the submersible pump automatically starts to fill it with water. ①I wonder if the pump will be fine with it being turned on and off like this ； ②Also, the pressure rises to 0.15 MPa before the pump stops; could operating the pump on and off under such pressure for a long time cause problems for the pump as well? Thank you all.
That’s how the design is; using it according to the instructions will be fine.
You can use it however you want; the pump must be started when the water runs out, and it must be stopped when the liquid level in the tank reaches a certain point. If you don’t want the pump to start and stop frequently, then you should use a larger tank. However, water has a shelf life – if it isn’t used for an extended period of time, its quality will deteriorate.
Check the pump’s head; centrifugal pumps generally cannot be damaged by backpressure
Frequent starting of the pump, along with operation under pressure buildup, may be harmful to the pump.
Teacher, is a submersible pump a centrifugal pump? I’m a beginner; I don’t understand.
When the pressure rises, the pump stops, and the outlet valve closes; what pressure is then built up in the pump?
Submersible pumps are mostly centrifugal pumps. You can start it several times a day; more than a dozen times is no problem. Just don’t start it right after stopping it. A pressure of 0.15 MPa can raise the water level to a height of 15 meters above the water storage tank; generally, it’s sufficient to have water at a height of 10 meters above the tank. If there is a gas water heater or similar device, the current pressure can be maintained, while if not, it’s not necessary to keep the pressure at that level.
As long as there is a label on the pump body, it is possible to contact the manufacturer; in addition, the manuals of other pumps of the same type can also be used as a reference. These types of water pumps, including those with automatic control, are well-developed designs; there are no issues with them. Increase the size of the storage tanks, or lower the minimum liquid level further; in any case, increasing the difference between the maximum and minimum levels will help reduce the number of startups. There are those with pressure control and those with level control. The models with pressure control don’t have storage tanks; they start operating when the pressure drops. It’s best to consult the manufacturer.