1. Pumps – Lectures 1 Outline: Where are pumps used
Pumps, fans, compressor differences
General HP and mechanical efficiency
Types of Pumps
Displacement
Dynamic
HW#9 Due 3/24 (download) or handout in class
Reading:
Handouts:
ITT Goulds Pumps Centrifugal Pump Fundamentals (in class) read all for 3/24
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 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 Flow rates Pressure Flow characteristics Displacement
- plunger
- piston
- rotary
Low
High
Pulsating
Dynamic
- centrifugal
- jet
- airlift
Steady Flow
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

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

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

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