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

Net Positive Suction Head for Rotodynamic Pumps: A Reference Guide: The Europump Guides to Advanced Pumping Technology

Autor EUROPUMP
en Limba Engleză Paperback – 12 mai 1999
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 advice on various aspects of cavitation and NPSH, to help the end user to improve all the factors involved.
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Specificații

ISBN-13: 9781856173568
ISBN-10: 1856173569
Pagini: 88
Dimensiuni: 140 x 216 x 4 mm
Greutate: 0.11 kg
Ediția:And.
Editura: ELSEVIER SCIENCE
Seria The Europump Guides to Advanced Pumping Technology

Cuprins

Preface. Introduction. Importance of inlet conditions. Cavitation. Effects of inadequate suction conditions. The Concept of NPSH. Pressure profile along the streamline. Definition of NPSH. Practical definition of NPSH. Other qualifying criteria for NPSH. Governing Parameters. Effect of speed and capacity. Effect of pump geometry. Effect of impeller trim. Effect of pumped liquid. Effect of inlet piping. Effect of pump material. Suction Specific Speed. Safety Margins Between NPSHR and NPSHA. Practical Determination of NPSHR. Determination of NPSHA. Atmospheric pressure. Reference level. Temperature and vapour pressure. Velocity head. Measurements from Bourdon gauges. Conversion from pressure to head. Examples of Calculations of NPSHA. Pump under positive head and liquid under atmospheric pressure. Pumps under negative head and liquid under atmospheric pressure. Liquid level under positive pressure and pump below the liquid level. Liquid level under positive pressure and pump above the liquid level. Liquid level under negative pressure and pump below the liquid level. Liquid level under negative pressure and pump above the liquid level. Liquid level under the vapour pressure of the liquid. Other Phenomena. Suction recirculation. Corrosion. Submergence under a free surface. Air or gas entrainment. Dissolved gases. Conclusions. Terms, Symbols, and Units. Appendices.