References Cte
8. Bloch, H. P., Improving Machinery Reliability, Practical Machinery Management for Process Plants, Vol. I, Gulf Publishing Company, Houston, Texas, 1982, pp. 72-162. 9. Atkins, K. E., Tison, J. D. and Wachel, J. C., Critical Speed Analysis of an Eight Stage Centrifugal Pump, Proceedings of the Second International Pump Symposium, April 1985, pp. 59-65. 10. Wood, D. J. and Chao, S. P. Effect of Pipeline Junctions on Waterhammer Surges, Proceedings of the ASCE, Transportation Engineering...
Diffuser Casings with Balance Disk
Figure 12-3 shows the diffuser-type configuration with a balance disk that carries the axial forces. Except for the axial balancing device, the construction is similar to the previous diffuser-type design. Balance disk construction is used for clean services such as boiler feed because of its ability to completely balance axial thrust at all operating flow rates. Figure 12-2. Diffuser-type in-line impeller, double-case pump with balance drum courtesy Dresser Pump Division, Dresser Industries,...
Destaging
It is not unusual for pipelines to start up at low pressure then later change to high pressure at constant throughput. This change in pump head requirements can be suitably handled by selecting a multi-stage pump for the ultimate high-pressure condition. For the initial low-pressure condition, appropriate impellers are removed and the interstage chambers isolated by destaging tubes Figure 10-13 . When changing to high pressure the destaging tubes are removed and additional impellers installed...
QuarterWave Resonance OpenClosed
The first three modes for an open-closed pipe, commonly referred to as a quarter-wave stub are depicted in Figure 18-7. The stub has its resonant frequencies at odd integer multiples of the fundamental quarter-wave frequency. Examples of a quarter-wave stub include a bypass line with a closed valve or a test connection with a pressure gauge. A quarter-wave resonance can cause erroneous measurements 131 when obtaining dynamic pressure data. A typical test connection, depicted in Figure 18-8,...
Specific Speed and Modeling laws 11
Definition of Pump Specific Speed and Suction Specific Speed. The Affinity Law. Specific Speed Charts. Correction for Impeller Trim. Model Law. Factoring Laws. Conclusion. Impeller Layout. Development of Impeller Profile Plan View . Development of Impeller End View. Impeller Inlet Angles. Development of Impeller Vane. Design Suggestions. Notation. Volute Design Types of Volute Designs. Single-Volute Casing Designs. Double-Volute Casing Designs. Double-Volute Dividing Rib Splitter ....
Reinforced Composite Material Pumps
The next development in nonmetallic pumps led to improved manufacturing techniques using thermo resin without armor. Successful resins include glass-reinforced thermoset composites. These have strengths equivalent to the metallic chemical pumps and are suitable for applications of acids, alkalies, oxidizing agents, solvents, and salts with temperature ranges up to 250 F as normal with peak temperatures up to 400 F Figure 15-19 . These pumps were originally called FRP fiber reinforced polymer...
12
Net positive suction head available NPSHA is of extreme importance for reliable pump operation. It is the total suction head in feet of liquid absolute, determined at the suction nozzle and referred to datum, less the vapor pressure of the liquid in feet absolute. This subject is discussed in detail in Chapter 9. The desired shape of the head capacity H-Q curve is determined during analysis of the system. Most specifications call for a continuously rising curve Figure 1-3 with the percentage...
Well Pumps
The most common applications for well pumps are Water well, or bore hole installations, using either a surface-mounted driver or a close-coupled submersible motor. Incline-mounted water pumps installed on lake or river banks and driven by a conventional electric motor or a close-coupled submersible Loading pumps in underground caverns used for storing petroleum products. The pump is mounted in a caisson. Dewatering pumps in mines. The pump is mounted in a mine shaft. This is the most common...
Val S Lobanoff Robert R Ross
A practical reference stressing hydraulic design, performance prediction, analysis, and evaluation Copyright 1985, 1992 by Butterworth-Heinemann. All rights reserved. Printed in the United States of America. This book, or parts thereof, may not be reproduced in any form without permission of the publisher. Originally published by Gulf Publishing Company, Houston, TX. For information, please contact Manager of Special Sales Butterworth-Heinemann 225 Wildwood Avenue Woburn, MA 01801 204 Tel...
Shaft Design and Axial Thrust333
Shaft Design. Shaft Sizing Based on Peak Torsional Stress. Shaft Sizing Based on Fatigue Evaluation. Shaft Deflection. Key Stress. Axial Thrust. Double-Suction Single- Stage Pumps. Single-Suction Single-Stage Overhung Pumps. Multi-Stage Pumps Notation. References. Mechanical Seals Theory of Operation. Design Fundamentals. Seal Leakage. Seal Wear. Classification of Seals by Arrangement. Classification of Seals by Design. Materials of Construction. Mating Ring Designs. Adaptive Hardware. Upstream...