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Pumps – Lectures 1






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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
Pumps – Lectures 1

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Pumps lectures 1 l.jpgSlide 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

Pumps fans compressors turbomachines l.jpgSlide 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

Pumps fans compressors turbomachines3 l.jpgSlide 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

Mechanical efficiency l.jpgSlide 4

Mechanical Efficiency

  • Ratio:

  • Power Output:

  • English Units, HP:

  • Efficiency

Dr. C. L. Jones

Biosystems and Ag. Engineering

Pump example 1 l.jpgSlide 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

Pumps l.jpgSlide 6

Pumps

  • Two types

Dr. C. L. Jones

Biosystems and Ag. Engineering

Displacement pumps l.jpgSlide 7

Displacement Pumps

Dr. C. L. Jones

Biosystems and Ag. Engineering

Displacement pumps8 l.jpgSlide 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

Displacement pumps9 l.jpgSlide 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

Dynamic pumps l.jpgSlide 12

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

Slide13 l.jpgSlide 13

Dr. C. L. Jones

Biosystems and Ag. Engineering

Performance curves l.jpgSlide 14

Performance Curves

Dr. C. L. Jones

Biosystems and Ag. Engineering


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