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Mechanical efficiency

Mechanical efficiency (ηm) is described as the ratio between the power input (P) minus the mechanical power loss (PL.m) and the power input itself:

Power loss refers primarily to the friction loss in pump bearings (e. g. plain and rolling element bearings) and shaft seals..

It typically consumes 0.5 to 2 % of power input, whereby this figure generally becomes smaller the more powerful the centrifugal pump.

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