Sewage Pump Impeller Selection

Although the mathematics that define the operation of an impeller can be complex (it is the stuff of Bernoulli and Euler), its purpose is straight forward. An impeller is designed to impart energy to a fluid so that it will flow or, if it is already flowing, undergo some increase in its elevation or pressure. It accomplishes this by increasing the fluid’s velocity as it travels through its vanes from the their leading edges, located at the eye to their exits at the periphery. The ever increasing radius of the vanes results in an increasing rotational velocity that reaches some maximum at the periphery. The resulting linear velocity of the fluid, at the vane exit, is then converted to pressure in the volute.