ABSTRACT
Since for rotodynamic machines the total head generated at any specified flowrate is a function of impeller tip speed squared:
H = f(Ul) and from
it can be seen that the higher the rotational speed the smaller the pump. This should mean that the pump is lighter, cheaper to make and would occupy less space in the pumping installation, and also the driver would be smaller. For positive displacement pumps the fundamental relationships between flowrate, head (or pressure) and speed are different but the same conclusion is true that a faster acting pump is a smaller, cheaper pump.
