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Protecting Progressing Cavity Slurry Pumps Publisher: Onyx Valve Co. Overview: Different methods of protecting progressive cavity slurry pumps against damage are presented in this paper, which describes the benefits and illustrates the functioning of progressive cavity pumps, stating the factors that can impact the reliability of their operation. It reviews the use of flow meter, thermal mass dispersion device, capacitive detector, thermal monitor, and power monitor for protecting the pump against damage from run dry conditions, and details the advantages of using pressure switches for monitoring flow conditions. Reasons for the occurrence of static pressure and friction pressure are described, illustrating the pressure switch settings for providing run dry protection. The paper uses an example to examine the advantages/disadvantages of monitoring pressure at the inlet or the outlet of the pump. View Company Profile View Company News View Pumps, Valves & Accessories Suppliers View Pumps, Valves & Accessories Guides Format: PDF Date: 2009-05-20 View all Onyx Valve Co. White Papers TABLE OF CONTENTS 1.1. Static Pressure 6 1.2. Friction Pressure 6 1.3. Total Pressure 6 2. Flow Detection with Pressure Switches. Suction or Discharge? 7 3. Figures 3.1. Figure 1: Progressing Cavity Pump 1 3.2. Figure 2: An Isolator Ring Sandwiched Between Flanges Transmits Pressure to Gauge or Pressure Switch without Clogging 2 3.3. Figure 4: The Thermal Mass Dispersion Device 3 3.4. Figure 5: Typical Isolator Ring with Control Box 5 3.5. Figure 6: Pump off 6 3.6. Figure 7: Pump on 6 3.7. Figure 8: Progressing Cavity Pump with Pressure Monitor on Suction Side 7 3.8. Figure 9: Same Tank Half Full 8 3.9. Figure 10: Feed Tank Is Almost Empty 8 3.10. Figure 11: Tank Empty 9 3.11. Figure 12: Elevated Feed Tank 9 3.12. Figure 13: Perfect Feed Tank 10 3.13. Figure 14 10

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