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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 l.jpg
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


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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


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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


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Mechanical Efficiency

  • Ratio:

  • Power Output:

  • English Units, HP:

  • Efficiency

Dr. C. L. Jones

Biosystems and Ag. Engineering


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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


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Pumps

  • Two types

Dr. C. L. Jones

Biosystems and Ag. Engineering


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Displacement Pumps

Dr. C. L. Jones

Biosystems and Ag. Engineering


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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


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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


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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


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Dr. C. L. Jones

Biosystems and Ag. Engineering


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Performance Curves

Dr. C. L. Jones

Biosystems and Ag. Engineering


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