Pump laws
Pumps are governed by certain laws which relate the rotation speed of the impellor to the volumetric flow rate, pressure rise, and power consumption.
If the impeller size is a constant but the impeller speed changes:
where the subscripts 1 and 2 refer to two different operating points for a given pump.
If the impeller speed is constant but the impeller size changes:
where D
i is the impellor diameter and the subscripts 1 and 2 refer to two different impellors for a given pump.