ISO INTERNATIONAL STANDARD 15848-1 Secondedition 2015-06-01 Industrial valves Measurement, test and qualification procedures for fugitive emissions Part 1: Classification system and qualification procedures for type testing of valves Robinetterie industrielle-Mesurage, essais et modes operatoires de qualificationpourémissionsfugitives Partie 1:Systeme de classification etmodes operatoires de qualificationpour lesessaisdetypedes appareilsderobinetterie Referencenumber ISO 15848-1:2015(E) LSO Intermational Organization for Standardization @IS02015 IS015848-1:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2015 All rights reserved. Unless otherwise specified, 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. ISOcopyrightoffice Case postale 56.CH-1211 Geneva 20 Tel. +4122 749 0111 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland PrganizationforStandardization networking permited without license from IHS NotforResale, 2015/8/705:28:43 IS0 15848-1:2015(E) Contents Page Foreword ..iv Introduction.. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols and abbreviations 5 Typetest .4 5.1 Test conditions. .4 5.1.1 Preparation of a valveto be tested 5.1.2 Test fluid .4 5.1.3 Test temperature ..4 5.1.4 Measurement of test valvetemperature. 4 5.1.5 Leakagemeasurement .7 5.2 Test procedures .8 5.2.1 Safety rules. .8 5.2.2 Test equipment ..8 5.2.3 Stem (or shaft) seal adjustment (SSA) .8 5.2.4 Test description 9 6 Performance classes .11 6.1 Classification criteria .11 6.2 Tightness classes. .11 6.2.1 Definition. .11 6.2.2 Helium as test fluid ..12 6.2.3 Methane as test fluid ..12 6.2.4 Correlations ..12 6.3 Endurance classes .12 6.3.1 Mechanical-cycle classes forisolating valves .12 6.3.2 Mechanical-cycleclassesfor controlvalves. ..14 6.4 Temperature classes. ..15 6.5 Examplesofclassdesignation .16 6.6 Marking .16 7 Reporting. ..16 8 Extensionofqualificationtountestedvalves ..17 AnnexA (normative)Total leakratemeasurement. ..19 AnnexB (normative)Leakmeasurementusing the sniffing method .32 Annex C (informative) Leak rate conversion (helium) ..41 Bibliography ..43 iii see=Zhejiang Institute of Standardization 5956617 vithoutlicense from IHS