1. Pumps Unit 10

2. Learning Objectives TLW be able to describe the following about pumps used in the process industry: –Types –Uses –Operation –Monitoring –Maintenance –Troubleshooting –Hazards

3. Warm up Questions How are dynamic pumps different from positive displacement pumps? What are some hazards associated w/ the operations of pumps? What is cavitation? What can cause it? List 3 monitoring and maintenance activities associated w/ pumps.

4. Today’s Agenda Today’s Agenda Purpose/function of pumps Applications in the Process Industry Types of pumps and their applications Pump hazards Monitoring and maintenance Symbols

5. Pumps in the Process Industry Pumps in the Process Industry Purpose: to cause liquids to flow through a process Liquids are cohesive (molecules touch each other) but have no definite shape Slurries – liquid/solid mixture

6. Types of Pumps Positive Displacement Dynamic Reciprocating Rotary Centrifugal Axial Piston & Cylinder Gears Diaphragm Screws Lobes Cams Vanes

7. Centrifugal Pumps Operating principle – centrifugal force caused by circular rotation Used to move large volumes of liquids w/ low viscosities Centrifugal force spins liquid away from the center Can be mounted in horizontal or vertical position

8. Positive Displacement Pumps Positive Displacement Pumps Reciprocating Piston or other mechanism moves back and forth Intake stroke – admits fluid into chamber Discharge Stroke – discharges fluid through outlet Good for metering specific amounts of fluids Rotary Screw, gears, lobes or vanes rotate Moves heavier fluid, viscous fluids, including slurries Discharges large amounts of fluid at low pressures

9. Pump Hazards Pump Hazards Improper Operation –Starting pump with discharge closed –Starting pump with drain open –Starting pump with vent open –Poor lubrication Impacts –Physical - Production –Equipment - Environment

10. Monitoring and Maintenance Monitoring and Maintenance Daily Check pressure across pump Check oil levels/seals Drains Weekly Check oil Wash down Swap pumps Monthly Change oil Wash down around pump Adjust packing Preventive Bearing, seals, worn parts Look –Oil levels –Seal & Flange Leaks –Suction Discharge Pressure Gauges –Water collecting (bearing failure) Listen –Abnormal noises (ex. cavitation) Touch –heat –Vibration Smell –Leaks –heat

11. Pump Symbols Pump Symbols See handout in section 11

13. Screw pump – horizontal mount

14. Vertically Mounted Pump

15. Piston pump

16. Diaphragm pump

17. Gear Pump

18. Single Screw Pump Twin Screw Pump

19. http://www.scs.uiuc.edu/chem_eng/kraftunitops2/image/lobe_pump _animation.gif Lobed pump

20. Internal gear pump

21. Sliding Vane pump

22. Multistage Pump

23. Multistage pump impeller

24. Multistage pump w/ driver (motor)

26. Independent Practice Pump Components Worksheet Pump Curve Exercise