1. ENTC-303PROF. ALVARADO1 Fluid Mechanics Lab: Positive Displacement Pumps ENTC - 303

2. Objectives 1.To gain an understanding of the types of positive displacement pumps, their working principle, design and construction. 2. To determine the performance characteristics curves of a positive displacement vane pump. ENTC-370PROF. ALVARADO2

3. ENTC-370PROF. ALVARADO3 Pumps Classification From www.pumpschool.com

4. ENTC-370PROF. ALVARADO4 Positive Displacement Pumps Positive displacement pumps have the capability of providing a fairly constant flow rate over a wide range of pressures. The pump delivers a fixed volume of liquid with every rotation of the input shaft

5. ENTC-370PROF. ALVARADO5 Positive Displacement Pumps Internal Gear PumpExternal Gear PumpVane Pump Circumferential Pump Lobe Pump Flexible member Pump Figures from www.pumpschool.comwww.pumpschool.com

6. Positive Displacement for (this week): –High viscosity –Exact flow for different pressures –High pressures Centrifugal (next week): –Low viscosity –High flows –Applications requiring a range of flows. ENTC-370PROF. ALVARADO6 Positive Displacement Pumps vs. Centrifugal Pumps

7. ENTC-370PROF. ALVARADO7 Positive Displacement Pumps vs. Centrifugal Pumps

8. ENTC-370PROF. ALVARADO8 Positive Displacement Pumps vs. Centrifugal Pumps

9. Pump efficiency The overall pump efficiency is a product of the volumetric efficiency and the mechanical efficiency ENTC-370PROF. ALVARADO9

10. (P is in Pa; Q A and Q T are in m 3 /s; T is in N-m; N is in RPS) ENTC-37010 Pump efficiency

11. ENTC-370PROF. ALVARADO11 Overall Efficiency = Vol.Efficiency x Mech.Efficiency Actual Power Out = P x Q A Actual Power In = Electrical Power Input (Watts)

12. ENTC-37012 Trial Number Pressure (Bar) Pressure (Pa) Current (Amp) Time (Sec) Flow Rate (L/Min) Flow Rate (m 3 /s) 1 2 3 4 5 Trial Number Power Output (W) Power Input (W) Overall Efficiency 1 2 3 4 5

13. ENTC-370PROF. ALVARADO13 Trial Number Flow Rate (GPM) Suction Pressure (psig) Discharge Pressure (psig) Pressure Difference (psig) 1 2 3 4 5 6

14. ENTC-370PROF. ALVARADO14 References www.pumpschool.com Fluid Power with applications, Anthony Esposito.