Elsevier S & T

Net Positive Suction Head for Rotodynamic Pumps: A Reference Guide: A Reference Guide

EUROPUMP

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Table of contents
  • Cover
  • Title Pageiii
  • Copyright Pageiv
  • Contentsv
  • Prefacevii
  • Chapter 1. Introduction1
  • 1.1. Importance of inlet conditions1
  • 1.2. Cavitation1
  • 1.3. Effects of inadequate suction conditions2
  • Chapter 2. The concept of NPSH5
  • 2.1. Pressure profile along the streamline5
  • 2.2. Definition of NPSH5
  • 2.3. Practical definition of NPSHR8
  • 2.4. Other qualifying criteria for NPSHR10
  • Chapter 3. Governing parameters13
  • 3.1. Effect of speed and capacity13
  • 3.2. Effect of pump geometry14
  • 3.3. Effect of impeller trim15
  • 3.4. Effect of pumped liquid16
  • 3.5. Effect of inlet piping17
  • 3.6. Effect of pump material18
  • Chapter 4. Suction specific speed21
  • Chapter 5. Safety margins between NPSHR and NPSHA25
  • Chapter 6. Practical determination of NPSHR31
  • Chapter 7. Determination of NPSHA33
  • 7.1. Atmospheric pressure34
  • 7.2. Reference level35
  • 7.3. Temperature and vapour pressure36
  • 7.4. Velocity head36
  • 7.5. Measurements from Bourdon gauges36
  • 7.6. Conversion from pressure to head37
  • Chapter 8. Examples of calculation of NPSHA39
  • 8.1. Pump under positive head and liquid under atmospheric pressure39
  • 8.2. Pumps under negative head and liquid under atmospheric pressure40
  • 8.3. Liquid level under positive pressure and pump below the liquid level41
  • 8.4. Liquid level under positive pressure and pump above the liquid level42
  • 8.5. Liquid level under negative pressure and pump below the liquid level42
  • 8.6. Liquid level under negative pressure and pump above the liquid level44
  • 8.7. Liquid level under the vapour pressure of the liquid45
  • Chapter 9. Other phenomena47
  • 9.1. Suction recirculation47
  • 9.2. Corrosion48
  • 9.3. Submergence under a free surface48
  • 9.4. Air or gas entrainment49
  • 9.5. Dissolved gases50
  • Chapter 10. Conclusions51
  • Chapter 11. Terms, symbols and units53
  • Appendices57
  • Appendix A57
  • Appendix B59
  • Appendix C63
  • Appendix D67
  • Appendix E71
Book details
  • Vendor Elsevier S & T
  • SKU 9781856173568
  • ISBN-13 9780080512877
  • Author EUROPUMP
  • Category Technology & Engineering
  • Subject Mechanical

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Cavitation, the result of insufficient pressure in a pump inlet, is not only the major cause of loss in pump performance, but also of reduced cost effectiveness. This practical guide provides straight forward, up to the minute advice on all aspects of cavitation and NPSH, enabling the end user to improve all the factors involved. Prepared by Europump - European Association of Pump Manufacturers - this book contains the results of years of research work and practical experience by leading European educational institutions and pump manufacturers to give a valuable unbiased guide which is applicable to all types of rotodynamic pumps and related systems.