The main working parameters of centrifugal pumps

(1) Flow: The amount of liquid discharged by the pump per unit time, usually expressed in volume units, the symbol Q, the units are ㎥/h, ㎥/s, etc.

(2) Head: The energy increase of the liquid per unit weight transported from the pump inlet (pump inlet flange) to the pump outlet (pump outlet flange), expressed in H, in kgf, m/kgf.

(3) Speed: The speed of the pump is the number of times the pump rotates per minute, which is expressed by N. The motor speed N is generally around 2900 rpm.

(4) NPSH: The NPSH of the centrifugal pump is the main parameter that indicates the performance of the pump, which is represented by the symbol Δhr and is measured in meters and liquid columns.

(5) Power and efficiency: The input power of the pump is the shaft power N, that is, the output power of the motor. The output power of the pump is the effective power Ne.