Download pdf - Cent Pump Internal Clearances_050506

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Page 1: Cent Pump Internal Clearances_050506

The Importance of Internal Clearances

Dr. Barry EricksonJustin Bjork

Flowserve Pump Division

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AgendaPurposeEnd Suction PumpsDouble Suction PumpsMulti-Stage PumpsWear Rings

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Purpose

Suction vs. Discharge PressuresEfficiencyThrust Loads

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Suction vs. Discharge Pressures

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End Suction Pumps

Vanes to CasingVanes to CoverThermal Expansion

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Double Suction Pumps

Offset Wear RingsShuttling Effect

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Multi-Stage Pumps

Opposing ImpellersEqual Pressure Loss

A Gap B GapLoose A Gap Eddy Flows =Axial VibrationTight B Gap Vane Passing Cavitation

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Opposing Impellers

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A Gap B Gap

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Vane Passing Cavitation

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Wear Rings

Lomakin EffectAlternate Materials

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Discussion

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