The Importance of Internal Clearances Dr. Barry Erickson Justin Bjork Flowserve Pump Division
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The Importance of Internal Clearances
Dr. Barry EricksonJustin Bjork
Flowserve Pump Division
AgendaPurposeEnd Suction PumpsDouble Suction PumpsMulti-Stage PumpsWear Rings
Purpose
Suction vs. Discharge PressuresEfficiencyThrust Loads
Suction vs. Discharge Pressures
End Suction Pumps
Vanes to CasingVanes to CoverThermal Expansion
Double Suction Pumps
Offset Wear RingsShuttling Effect
Multi-Stage Pumps
Opposing ImpellersEqual Pressure Loss
A Gap B GapLoose A Gap Eddy Flows =Axial VibrationTight B Gap Vane Passing Cavitation
Opposing Impellers
A Gap B Gap
Vane Passing Cavitation
Wear Rings
Lomakin EffectAlternate Materials
Discussion
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