Pumps are powered by electric motors
that convert the electric energy to mechanical. This drives the pump’s impellers to move fluids under pressure from one point to another. As the impeller rotates, it creates pressure to pull or push fluid in the desired direction. Pump motors vary in size depending on their applications. They are sized according to the specific gravity of the fluid. You can determine a fluid’s specific gravity by dividing its density by the density of water. It is important to size your pump motor appropriately because it is most efficient when fully loaded. If your motor is too big for the function you want, then you waste energy. However, if it is too small, it can easily burn out. When selecting a motor for your pump, it is important to specify whether it is a surface or submersible pump. Surface pumps usually have horizontal installations and suitable for suction heads that are less than 7 or 10 meters. The suction head is the vertical distance between your pump and the suction pipe inlet. The suction head does not matter for submersible pumps
as they are installed deep below the fluid’s surface. They work best with submersible motors.