Read e-book online Centrifugal Pump Handbook PDF

By Sulzer Pumps

This long-awaited new version is the entire reference for engineers and architects engaged on pump layout and improvement or utilizing centrifugal pumps within the box. This authoritative consultant has been built with entry to the technical services of the best centrifugal pump developer, Sulzer Pumps. as well as offering the main finished centrifugal pump thought and layout reference with unique fabric on cavitation, erosion, choice of fabrics, rotor vibration habit and forces performing on pumps, the instruction manual additionally covers key pumping software subject matters and operational concerns, together with working functionality in quite a few sorts of circuitry, drives and recognition trying out.

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29). Due to increased losses, higher NPSH must be made available when pumping liquids with viscosities appreciably higher than cold water. The pressure losses in the impeller and diffuser channels of centrifugal pumps, the impeller friction and internal leakage losses, depend to a large extent on the viscosity of the pumped liquid. Consequently, the characteristics ascertained for water lose their validity when pumping liquids of higher viscosity, such as oil. 29 Comparison of characteristics for reciprocating and centrifugal pumps at constant speed and different viscosities The higher the viscosity of a liquid compared with water, the greater is the loss of flow capacity and head for a given pump at a given speed.

The new operating point is found by plotting Q0 on the Q axis or H0 on the H axis. In this way the corrected impeller diameter can be determined. e. first turning-down to a larger diameter than the one calculated and carrying out a trial run. Only after this is the impeller corrected to its final diameter. 2 Sharpening of impeller blade trailing edges By sharpening the impeller blades on the suction side (also called underfiling), the outlet angle can be enlarged to obtain up to 5% more head near the best efficiency point, depending on the outlet angle.

Wide impeller side spaces facilitate pressure equalization over the periphery and consequently can reduce the radial thrust. Pumps with diffusers are subject to lower radial thrusts than pumps with volute casings. The steady component of the radial thrust becomes greater with increasing eccentricity of the impeller in the casing, while the unsteady component is greatest during concentric running. 9 ROTOR DYNAMICS Rotor dynamics is concerned with the vibrational behavior of shafts. This includes both lateral and torsional vibrations.

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