ISO/TR TECHNICAL REPORT 19688 First edition 2019-01 Rotodymanic pumps Hydraulic performance acceptance test using a model pump Pompes rotodynamiques - Modele reduit de pompe utilise pour les essais de performance hydraulique Reference number ISO/TR 19688:2019(E) ISO @IS02019 IS0/TR 19688:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0/TR 19688:2019(E) Contents Page Foreword ..V Introduction.. ...vi 1 Scope.. 2 Normative references 3 Terms and definitions 3.1 General terms.. ..1 3.2 Terms and definitions relating to performance. 4 Symbols and suffixes. ..5 5 Test types and measurement items .1 6 Model pump. .1 6.1 Extent of model pump > 6.2 Dimensional ranges of model pump 6.2.1 Reynolds number .8 6.2.2 Dimension of impeller 6.2.3 Pump total head. .8 6.3 Construction of model pump 7 Performance test. ..9 7.1 Test installation and measuring instruments 9 7.2 Test conditions.. .12 7.2.1 Test operation. ..12 7.2.2 Stability of operation. ..12 7.3 Number of measurement points .14 7.4 Pump total head .14 7.4.1 General .14 7.4.2 Measuring instruments .14 7.4.3 Liquid column manometer. ..14 7.4.4 Spring pressure gauge. ..15 7.4.5 Digital pressure gauge .15 7.4.6 Pressure tappings . .15 7.4.7 Damper. ..16 7.5 Volume rate of flow. .16 7.5.1 Orifice plate nozzle and venturi tube .16 7.5.2 Electromagnetic flowmeter. .16 7.5.3 Mass method or volumetric method .16 7.6 Speed of rotation.. .16 7.6.1 Measurement method. ..16 7.6.2 Measuring instruments .16 7.7 Pump power input. .17 7.7.1 Method for measuring pump power input .17 7.7.2 Measurement of torque ..17 7.8 Measurement uncertainty .17 7.9 Calculation of pump power input, pump power output, and pump efficiency. ..17 8 Cavitation test and NPSH3 test .18 8.1 Concept of test. .18 8.2 Test method. .18 8.2.1 General ..18 8.2.2 Cavitation test ..18 8.2.3 NPSH3 test ..19 8.3 Characteristics of the test liquid ..19 8.4 Test installation. ..19 9 Indication of performance and evaluation of test results ..19 IS0 2019 - All rights reserved iii