•could cause cavitation erosion, vibrations and pressure pulsations. This reasoning of partload recirculation. It is therefore incorrect to derive the onset of recirculationfrom the suction specific speed as was done in the endeavor to facilitate pumpselection. Such a suction specific speed limitation constitutes an impermissible simplificationof the three-dimensional flow processes leading to partload recirculation.Moreover, as explained in Chap. 7, high suction specific speeds can be achieved notonly through the enlargement of the impeller inlet, but far better through the carefuldesign of the blades.2 The statistics originate from the period 1975–1981 on the operation of pumps developed in theis correct tendency-wise at best since, in addition to the impeller inlet diameter, anumber of other parameters are responsible for the intensity and damage potentialsixties; details in [28].3 Different limits were propagated depending on the type of pump and author.
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