48519030572697022 INTERNATIONALSTANDARDISO9951:1993 TECHNICALCORRIGENDUM1 ISO Published 1994-11-15 Measurement of gas flow in closed conduits - Turbine meters TECHNICALCORRIGENDUM1 Mesurededebitdegaz dansles conduites fermées--Compteursaturbine RECTIFICATIFTECHNIQUE1 Technical corrigendum 1 to International Standard ISO 9951:1993 was prepared by Technical Committee ISO/TC 30, Measurement offluidflow in closed conduits, Subcommittee Sc 1o, Turbinemeters. Page 12 SubclauseE.4.2 In the third line, delete "two elbows of diameter equal to D,." and replace with "two elbows of radius of curvature equal to D,". UDC 532.575.57:681.121.4 Ref.No.ISO 9951:1993/Cor.1:1994(E) Descriptors:gasflow,pipeflow,flow measurement, flowmeters,turbinemeters,specifications,performanceevaluation,dimensions, tests, pressuretests, calibration, inspection, marking. ISO1994 Printed in Switzerland n fnr Stanriarrlizatinn 150 9951 93 4851903 0551430 748 INTERNATIONAL ISO STANDARD 9951 First edition 1993-12-01 Measurement of gas flow in closed conduits Turbine meters Mesure dedébit de gaz dans les conduites fermées -Compteurs a turbine ISO Reference number ISO9951:1993(E) 48519030551431684 150 9951 93 ISO9951:1993(E) Contents Page 1 Scope 2 Normative references 3 Definitions and symbols 3.1 Definitions 3.2 Symbols and subscripts 4 Principle of the method of measurement 3 5 Flowrates 3 6 Meter construction 3 6.1 General 3 6.2 Materials 3 6.3 Shell 3 6.4 Connectionsand maximumflowrates 3 6.5 Length 3 6.6 Pressure tappings 3 6.7 Flow direction 4 6.8 Meter having a removable meter mechanism 4 6.9 Overloading 4 6.10 Marking 4 7 Pressure testing 4 7.1 General 4 7.2 Test fluid 4 7.3 Strength test of the pressure-containing parts 4 7.4 Meter ieakage test 5 Performancecharacteristics 5 8.1 Error 5 ISO1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission inwritingfrom the publisher. International Organization for Standardization CasePostale56:CH-1211Geneve20:Switzerland Printed in Switzerland