Prevent submersible pump malfunction

Submersible pump is an important equipment for deep wells, the whole unit should be submerged into the water. But what are the problems with submersible pumps?
Submersible pump for the vertical arrangement, the pump and the motor coaxial, so that the weight of the rotating parts and impeller to withstand the same direction of water pressure; Second, the submersible pump is used in the liquid, the transport of sewage media containing impurities, Material; Third, the submersible pump is a kind of centrifugal pump, in its operation, the power is always increased with the increase in traffic, when the flow exceeds the design flow and reach a certain value, the motor will be burned due to overload.