a centrifugal pump conveys a fluid from a rotor wheel inlet opening via a rotor wheel outlet opening into a pressure nozzle . the fluid has a velocity profile between the outer flow line and the inner flow line . the method allows a fluid to be conveyed with a centrifugal pump in such a manner that the velocity profile is continuously changed in dependence on the delivery flow which means that an abrupt change of the velocity profile when transferring from one load condition , e . g . at maximum efficiency , to another load condition , e . g . a partially loaded region , is avoided which results in a stable h / q )- characteristic .