EBOOK - Centrifugal Pump Users Guidebook Problems and Solutions (Sam Yedidiah) | Cộng đồng Kỹ thuật cơ điện Việt Nam EBOOKBKMT

EBOOK - Giải pháp và các vấn đề hướng dẫn sử dụng bơm ly tâm (Sam Yedidiah) - 375 Trang.

This book discusses two classes of activities: preventive procedures and corrective steps. Sometimes these two activities are so intimately connected that it is impossible to separate one from the other. Also, to execute these activities properly, an in-depth knowledge and understanding of centrifugal pump operation and diagnostic procedures is required.

CONTENTS:

PART I. INTRODUCTION 1
Chapter 1. Rotodynamic Pumps 3
Chapter 2. Performance Chracteristics of Centrifugal Pumps
Chapter 3. Classification of Centrifugal Pumps
PART II. PERFORMANCE FACTORS 29
Effects of Free Air in the Pumped Liquid 31
Cavitation 33
Cavitation in Centrifugal Pumps 45
Losses of Energy 61
Effects of Temperature and Viscosity on Pump Performance 75
Recirculation 79
Axial and Radial Thrust and Balancing 97
Miscellaneous Factors that Affect Pump Performance III
PROBLEMS ENCOUNTERED WITH CENTRIFUGAL PUMPS
Testing
Pump Performance at Reduced NPSH
Pumping System Layout
Installation. Handling, and Operation of Pumps and
Pumping Systems
Problems with Bearings
Sealing Rotating Parts
Miscellaneous Studies
Problems Related to Specific Circumstances
Special Cases that Have Proven Very Difficult to Solve
SOLVING PUMP PROBLEMS
Solving Problems Prior to Visiting the Site
Conclusions Drawn from Visual Inspection of Failed Parts
On-Site Inspection and Testing
PART V. ELIMINATING PUMP PROBLEMS AND MODIFYING PERFORMANCE
Remedial Methods
The Effects of Speed and Impeller OD on Pump Performance
The Effects of Reducing the Impeller Width
Moditying the Casing Geometry
Various Methods of Altering Pump Performance
A GLIMPSE OF THE FUTURE
New Findings Concerning the Mode of Operation of Rotodynamic Impellers
Some Future Applications of the Presented Theory
Appendix A. Checklist of Problems with Centrifugal Pumps and their Causes
1. Pump Does Not Develop Any Head, Nor Does It Deliver Liquid
2. Pump Develops Some Pressure, but Delivers No Liquid
3. Pump Delivers Less Liquid Than Expected
4. Pump Does Not Develop Enough Pressure
5. Shape of Head-Capacity Curve Differs from Rated Curve
6. Pump Consumes Too Much Power
7. Pump Does Not Perform Satisfactorily, Although Nothing Appears to be Wrong with Pumping Unit or System
8. Pump Operates Satisfactorily During Start, but Performance Deteriorates in a Relatively Short Time
9. Pump is Operating with Noise, Vibrations, or Both
10. Stuffing Box Leaks Excessively
11. Packing Has Short Life
12. Mechanical Seal Has Short Life
13. Mechanical Seal Leaks Excessively
14. Bearings Have Short Life
15. Bearings Overheat
16. Bearings Operate with Noise
17. Pump Overheats, Seizes, or Both
18. Impeller or Casing, or Both, Has Short Life
19. Loud Blow is Heard Each Time Pump is Started or Stopped
20. Casing Bursts Each Time Pump is Started or Stopped
21. Gaskets Leak During Pump Operation
22. Flow-Rate Periodically Decreases, or Stops Completely, then Returns to Normal
23. Pump Develops Cavitation when the Available NPSH is Increased
Appendix B. Tables
Vapor Pressures of Water at Different Temperatures
Gall Resistance of Material Combinations
Packing Selections
Tables of Chemical Compatibility of Materials
Bibliography

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