Net Positive Suction Head for Rotodynamic Pumps: A Reference Guide - 1st Edition - ISBN: 9781856173568, 9780080512877

Net Positive Suction Head for Rotodynamic Pumps: A Reference Guide

1st Edition

Authors: EUROPUMP
Paperback ISBN: 9781856173568
eBook ISBN: 9780080512877
Imprint: Elsevier Science
Published Date: 13th May 1999
Page Count: 88
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Table of Contents

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.


Description

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.

Readership

For engineers, scientists, educational institutions and users of pumps and pump systems.


Details

No. of pages:
88
Language:
English
Copyright:
© Elsevier Science 1999
Published:
Imprint:
Elsevier Science
eBook ISBN:
9780080512877
Paperback ISBN:
9781856173568

About the Authors