1. Lobe Pumps Marco Duca Tony Ghioldi Becky Grove 12 October 2005

2. Lobe Pumps Lobe Pumps are rotating, fixed volume, positive displacement pumps. Lobe Pumps are rotating, fixed volume, positive displacement pumps. Basic components include Basic components include Inlet Inlet Outlet Outlet Lobes Lobes

3. Operation: Step 1 Rotation of lobes Rotation of lobes Creation of expanding volume Creation of expanding volume Suction effect Suction effect Fluid entrapment Fluid entrapment

4. Operation: Step 2 Liquid flows between walls Liquid flows between walls

5. Operation: Step 3 Lobes re-mesh Lobes re-mesh Fluid forced out by pressure Fluid forced out by pressure

6. Operating Conditions Operating Pressure Operating Pressure 50—300 psi 50—300 psi Volume Volume 0—600 gpm 0—600 gpm Rotational Speed Rotational Speed 500—1000 rpm 500—1000 rpm Suction lift Suction lift Up to 25 ft. Up to 25 ft.

7. Advantages Able to mass medium solids Able to mass medium solids No metal to metal connectivity No metal to metal connectivity Non pulsating discharge Non pulsating discharge High sanitary qualities High sanitary qualities High efficiency, reliability High efficiency, reliability Good clean-in-place/service-in-place qualities Good clean-in-place/service-in-place qualities

8. Disadvantages Requires timing gears Requires timing gears Requires two seals Requires two seals Lower viscosity fluids lower the suction lift Lower viscosity fluids lower the suction lift

9. Industrial Uses Sanitation Sanitation Food Services Food Services Pharmaceutical Pharmaceutical Beverage Beverage