Pump Performance Chart

The affinity law describes the speed dependency of the delivery parameters of centrifugal pumps. It can be derived from the general similarity relationships as a special case.

The pumping performance of a centrifugal pump is expressed in the form of an H-Q curve, depicting the Flow Q (e.g. in m³/h) and the Head H (e.g. in m) of the pump.

Impeller trimming is the reduction of the impeller diameter of a centrifugal pump with the aim of adapting the operating point to the specifications.

The system H-Q curve is essentially a parabolic curve representing the relation between the head (pressure) required to handle the respective rate of flow within a pipe system.

The operating point of a centrifugal pump is the point at which the pump has its maximum efficiency.

The head is a measure of the pressure delivered by the pump. It is usually indicated in a characteristic curve as a function of the flow (throttle curve).