Among the losses arising in low specific speed pumps, the disc friction and leakage losses are especially important. These losses arise due to the flow through unavoidable gaps and side spaces (SS) between impeller and casing. To predict these losses, normally simple correlations and empirical formulas are used. The following analysis was intended to study the effects of the radial clearance of the sealing gaps as well as of the surface roughness of the wetted surfaces within the SS, which may have an essential impact on the losses of centrifugal pumps.

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