ISO INTERNATIONAL STANDARD 16664 Second edition 2017-05 Gas analysis Handling of calibration gases and gas mixtures - Guidelines Analyse des gaz - Mise en oeuvre des gaz et des mélanges de gaz pourétalonnageLignesdirectrices Reference number IS0 16664:2017(E) International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under I itted without license from IHS IS0 16664:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS02017,PublishedinSwitzerland 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. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+41 22 749 01 11 Fax +41227490947 [email protected] www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZRoISQ s1.7 - All rights reserved I by IHS unde Not for Resale, 2017/8/21 00:55:55 etworking permitted without license from IHS IS0 16664:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 4 Transport and storage .3 4.1 General remarks .3 4.2 Low temperature. .3 4.3 High temperature. 4 4.4 Water. ..4 4.5 Storage and handling 4 5 Mode of withdrawal. .4 5.1 General. .4 5.2 Minimum utilization pressure 4 5.3 Temperature ..5 5.4 Pressure reduction and flow .5 5.5 Replacement, change of cylinder positions ..5 6 Transfer system. .5 6.1 Purging procedure .5 6.2 Considerations when designing and constructing gas transfer lines .6 6.2.1 Modes of gas sampling. .6 6.2.2 Pressure- and flow-reducing equipment. .7 6.2.3 Material for the construction of transfer lines 6.2.4 General methods and examples of sampling systems .10 7 Stability ..13 Annex A (informative) Check on the stability of calibration gas mixtures by end-users. ..14 Bibliography .16 iii See=ZHEJIANG INSTOFSTANDARDIZATIONC15956617 vided by IHS under lic ithout license from IHS