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Pumps – Lectures 1

Pumps – Lectures 1. Outline: Where are pumps used Pumps, fans, compressor differences General HP and mechanical efficiency Types of Pumps Displacement Dynamic Reading: Handouts: ITT Goulds Pumps Centrifugal Pump Fundamentals (in class) read all

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Pumps – Lectures 1

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  1. Pumps – Lectures 1 • Outline: • Where are pumps used • Pumps, fans, compressor differences • General HP and mechanical efficiency • Types of Pumps • Displacement • Dynamic • Reading: • Handouts: • ITT Goulds Pumps Centrifugal Pump Fundamentals (in class) read all • Fluide Design Inc. Centrifugal Pump Fundamentals (download) Dr. C. L. Jones Biosystems and Ag. Engineering

  2. Pumps, Fans, Compressors--Turbomachines • Turbomachines: change energy level of flowing fluid by means of momentum exchange • 2nd only to electric motors in number • Wide spread in ALL industries • Power units: cars/trucks, tractors • Computers • Grain elevators • Oilfield • Water supply/treatment • Food processing • And……. Dr. C. L. Jones Biosystems and Ag. Engineering

  3. Pumps, Fans, Compressors--Turbomachines • Differences between pumps, fans, compressors • Pumps: move liquids • Fans: move gases with little increase in pressure • Compressors: move gases with greater increase in pressure Dr. C. L. Jones Biosystems and Ag. Engineering

  4. Mechanical Efficiency • Ratio: • Power Output: • English Units, HP: • Efficiency Dr. C. L. Jones Biosystems and Ag. Engineering

  5. Pump example 1 • A pump provides 0.009 m^3/s of water and total head of 10.6 m. Determine the power output of the pump. If the power input is 1310 W, determine the mechanical efficiency of the pump. • Pump Example 2, English Units • Will be shown in class

  6. Pumps • Two types Dr. C. L. Jones Biosystems and Ag. Engineering

  7. Displacement Pumps Dr. C. L. Jones Biosystems and Ag. Engineering

  8. Displacement Pumps • Reciprocating and Piston Pumps • Crank • Connecting rods • Pistons or plungers • Vol. efficiencies > 97%, Mech. eff. approx. 90% • For more stable flow, increase number of cylinders Dr. C. L. Jones Biosystems and Ag. Engineering

  9. Displacement Pumps • Rotary Pumps (gear, lobe, screw, vane) • Most popular: gear pumps • 90%+ mechanical eff. • Relatively constant output Dr. C. L. Jones Biosystems and Ag. Engineering

  10. Dynamic Pumps • Centrifugal • Relative simplicity • Mech. eff. as high as 90% • Can handle fluids containing suspended solids • Ease of maintenance…good for food products • 2 parts: impeller and casing • Radial, mixed, axial flow Dr. C. L. Jones Biosystems and Ag. Engineering

  11. Dr. C. L. Jones Biosystems and Ag. Engineering

  12. Performance Curves Dr. C. L. Jones Biosystems and Ag. Engineering

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