Various losses of centrifugal pump

(1) volume loss
Losses due to leakage caused by the pump referred to volume loss. When no volume loss of power when the pump and the pump volume loss ratio of the power called pump volumetric efficiency.
(2) hydraulic losses
Fluid flow through the impeller, the pump housing, there is a change of flow rate and inverse pressure gradient magnitude and direction of the circulation and cause vortex, resulting in energy loss, this loss is called hydraulic losses. Rated flow centrifugal pump hydraulic efficiency generally 0.8 to 0.9.
(3) mechanical loss
And the bearing friction loss, seal, etc. of high-speed rotating mechanical friction between the impeller and the liquid called mechanical losses caused.mechanical efficiency is generally 0.96 to 0.99.