0107 12-L1-L2-Pumps etc

0107 12-L1-L2-Pumps etc - Pumps, Compressors, Fans,...

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Pumps, Compressors, Fans, Ejectors and Expanders Chapter 20 ChEN 4253 Design I Terry A. Ring
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Pumps Moves Liquid, Creates Pressure Vapor bubbles • Causes Cavitations • Erodes Impeller Solids Erode Impeller Pump Types Centrifugal Positive Displacement Piston diaphragm Pump Power = Q*ΔP = brake (delivered) (horse) power from motor
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Centrifugal Pumps Two Basic Requirements for Trouble- Free Operation of Centrifugal Pumps no cavitation of the pump occurs throughout the broad operating range a certain minimum continuous flow is always maintained during operation Pump around loops
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Reduced Flows Unfavorable conditions which may occur separately or simultaneously when the pump is operated at reduced flows Cases of heavy leakages from the casing, seal, and stuffing box Deflection and shearing of shafts Seizure of pump internals Close tolerances erosion Separation cavitation Product quality degradation Excessive hydraulic thrust Premature bearing failures
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Centrifugal Pump Electric Motor
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Centrifugal Pump Electric Motor
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Centrifugal Pump Converts kinetic energy to pressure energy
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Impellers
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Converts Kinetic Energy to Pressure Energy
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Different Types of Pump Head Total Static Head - Total head when the pump is not running Total Dynamic Head (Total System Head) - Total head when the pump is running Static Suction Head - Head on the suction side, with pump off, if the head is higher than the pump impeller Static Suction Lift - Head on the suction side, with pump off, if the head is lower than the pump impeller Static Discharge Head - Head on discharge side of pump with the pump off Dynamic Suction Head/Lift - Head on suction side of pump with pump on Dynamic Discharge Head - Head on discharge side of pump with pump on
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This note was uploaded on 01/07/2011 for the course ENGLISH 1303 taught by Professor May during the Spring '10 term at HKU.

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0107 12-L1-L2-Pumps etc - Pumps, Compressors, Fans,...

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