Question: Is it possible for submersible motor pumps to run dry?


Dry running of Wastewater Pumps can damage the mechanical seal and the motor. For this reason, the float switches should be arranged so that the fill level in the shaft does not fall below the minimum level required to operate the pump. (See also ‘What minimum fill level is required to properly operate the pump?’). The actual conditions prevailing in the application in question must therefore always be reconciled with the information provided in the operating instructions or the datasheet before initial start-up of the pump.

On submersible well pumps, it is possible for a submersible pump to run dry.  This caused by over pumping the well where the depth to water level drops while the pump is running. Until the water level in the well reaches down to the pump intake screen. Often submersible pumps pump more water then recovers into the well. Lowering the pump further down the well is the most common solution. Adjusting tank size and demand cycles also helps.

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