All submersible pumps operate on a centrifugal basis with an impeller rotating with a volute causing water to be drain in and pumped out through the discharge connection. The Impeller is driven by a shaft which in turn is driven by a close coupled electrical motor. To prevent water entering the motor the cable taking power into the pump is sealed. At the other end the shaft is fitted with a mechanical seal and separates from the motor by an oil chamber. All quality pumps are fitted with conductivity probes in this chamber that effectively measures the quality of the oil and cut the pump out when the seal begins to fail, preventing the motor from serious damage.
Submersible pumps generally operate in arduous conditions and can require regular maintenance. It is imperative that pumps are correctly selected with the application given as much thought as the pump duty point. Pumps must also be checked for wear whilst being serviced as the impellers will begin to wear from day one of operation and this will effect the speed at which the pump will pass flows forward.
