AmericanNational Standard for
Rotodynamic Pumps
GuidelineforEffectsof LiquidViscosityonPerformance
AmericanNationalStandardfor
RotodynamicPumps- GuidelineforEffectsof LiquidViscosityonPerformance
Hydraulic Institute Sponsor
National American Standard
Pubilished By
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bosdunm
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Printed in the United States of America
ISBN 978-1-935762-95-9
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Consensus is established when in the judgement of the ANSI Board of Standardsinterests.Substantialagreementmeansmuchmorethanasimplemajoritybutnote e Ae pue Anop Aa pu ueq seu suoe jsns messarily unanimity. Consensus requires that all views and objections be considered and that a concerted effort be made toward their resolution.
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Contents
Page
Foreword 9.6.7.1 9.6.7 Introduction. 19.6.7.1.1 Purpose. 1 19.6.7.1.2 9.6.7.1.3 Scope... Preferred terms units and symbols for pump applications .. 2 29.6.7.2 Introduction to performance corrections 49.6.7.3 Fundamental considerations . Viscous correction factors 59.6.7.3.1 9.6.7.3.2 Methodsfordetermining correctionfactors 5 59.6.7.4 Synopsis of Hydraulic Institute method. Generalizedmethod based onempirical data 69.6.7.4.1 9.6.7.4.2 Viscous liquid performance correction limitations 6 79.6.7.4.3 9.6.7.4.4 Symbols and detinitions used for determining correction factors. Overview of procedure to estimate effects of viscosity on pump performance 89.6.7.4.5 Instructions for determining pump performance on a viscousliquid when performance on water is known... 119.6.7.4.6 Instructions for preliminary selection of a pump for given head rate of flow 9.6.7.5 Further theoretical explanations ...... and viscosity conditions .. 18 219.6.7.5.1 Scope. 219.6.7.5.2 9.6.7.5.3 Power balance and losses Method for estimating net positive suction head required (NPSH3) .... . 24 219.6.7.6 Additional considerations 289.6.7.6.1 9.6.7.6.2 Sealing issues Mechanical considerations. 28 289.6.7.6.3 Sealless pumps 309.6.7.7 Biblography 30Appendix A Conversion of kinematic viscosity units. 32Appendix B Index 34
Figures
9.6.7.3.1- Modication of pump characteristics when pumping viscousliquids 9.6.7.4.4a - Flowchart to establish if the procedure is applicable 5 89.6.7.4.4b - Flowchart to determine pump performance on a viscous liquid when performance on9.6.7.4.4c - Flowchart to select a pump for given head rate of flow and viscous conditions. water is known. .. . 10 99.6.7.4.5a - Chart of correction factors for Co and CH 129.6.7.4.5b - Chart of correction factors for C 139.6.7.4.5c - Example performance chart of a single-stage pump (metric units) 9.6.7.4.5d - Example performance chart of a single-stage pump (US customary units) 1518
Tables9.6.7.5.2a - Ratio of disk friction losses to useful power (references 9 and 10 in Bibliography) 239.6.7.5.2b -Influence of disk friction losses on viscosity correction factor for efficiency (references 9 and 10 in Bibliography) - 239.6.7.5.3a - Example NPSH3 chart (metric units) - 269.6.7.6.1-Example speed versus torque curve 9.6.7.5.3b - Example NPSH3 chart (US customary units). 279.6.7.4.5a - Example calculations (metric units) 29 159.6.7.4.5b - Example calculations (US customary units) 179.6.7.5.3a - Example calculations (metric units) 269.6.7.5.3b - Example calculations (US customary units). 27
