Losses in a pump occur, when the mechanical energy provided through the shaft does not completely transfer to the conveyed fluid. A difference between external and internal losses is made here. External losses include mechanical losses in bearings, seals, etc. that do not change the properties of the conveyed fluid. Internal losses, in contrast, include hydraulic losses (flow friction, flow separation, momentum exchange), gap and leakage losses and disc friction losses. These result in the conveyed fluid being heated up.

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