Pump Wisdom. Robert X. Perez

Advanced Bearing Housing (Bearing Protector Seal) Summary What We Have Learned References

      14  9 Mechanical Sealing Options for Long Life Still Using Packing? General Overview of Mechanical Seals All Flush Plans Have Advantages and Disadvantages Always Obtain the Full Picture Seal Chamber Pumping Ring (Circulating Device) Technologies Lessons Apply to Many Services References

      15  10 Pump Operation Starting Centrifugal Pumps Surveillance of Pump Operation Optimum Pump Switching Interval Centrifugal Pump Shutdown Addressing Post Start‐up Issues Avoiding Parallel Pump Operating Problems References

      16  11 Impeller Modifications and Pump Maintenance Maintenance Essentials Superior Maintenance Requires Upgrading Impeller Upgrading with Inducers Distance from Impeller Tip to Stationary Internal Casing Components Impeller Trimming Impeller Wear Rings Vane Tip Overfiling and Underfiling Carbon Graphite Wear Rings and Bushings References

      17  12 Lubrication Management How Bad Is Water Contamination? Avoid Solids Contamination Avoid Questionable Oil Storage and Transfer Practices Periodic Audits References

      18  13 Pump Condition Monitoring Vibration and Its Effect on Bearing Life Monitoring Methods Differ Vibration Acceptance Limits Causes of Excessive Vibration Rotor Balancing References

      19  14 Drivers, Couplings, and Alignment Driver Selection Coupling Selection and Installation Installation and Removal Alignment and Quality Criteria Consequences of Misalignment Thermal Rise and Predefinition of Growth References

      20  15 Fits, Dimensions, and Related Misunderstandings Low Incremental Cost of Better Pumps Pump Pedestals and Bearing Housings Should Not Be Water‐Cooled Summary of Bearing‐Related Issues Constant Level Lubricators Bearing Housing Protector Seals (“Bearing Isolators”) Motor Lubrication Summary Mechanical Seal Issues Hydraulic Issues Impeller Hydraulics Mechanical Improvement or Upgrade Options Process Pump Repair Dimensions References

      21  16 Using Failure Statistics and Root Cause Analysis Findings to Guide Reliability Improvement Efforts Mean‐Time‐Between Failures and Repair Cost Calculations Performing Your Own Projected MTBF Calculations Older Pumps vs. Newer Pumps Reliability Reviews Start Before Purchase Structured Failure Analysis Strategies Solve Problems The “FRETT” Approach to Eradicating Repeat Failures of Pumps Analyzing Pump Failure Data Why We Use Reliability Tools Cumulative