The mechanical power requirement of a centrifugal pump (shaft power) is directly proportional to the density of the pumped medium. P 2 ~ ρ P 2 = shaft power ρ = density of the pumped medium In contrast, the throttle curve of the pump H (Q) and the efficiency η (Q) are independent of the density. These relationships are automatically taken into account by the pump selection software.

Dimensioning criterias

The top four criteria are: WHAT for a medium? –> Pumping medium HOW MUCH Amount? –> Flow rate WHERE, how far, how high? –> Pipe geometry WHICH pump unit should be used? –> Delivery unit If the flow rate and pipe geometry are known, the head can be calculated with the help of the pressure loss calculation. Flow rate and head together form the duty point for the pump design.