ISO INTERNATIONAL STANDARD 6974-5 Second edition 2014-07-15 Natural gas Determination of composition and associated uncertainty by gas chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to Cs hydrocarbons and C6+ hydrocarbons Gaz naturelDéterminationde la composition et de I'incertitude associée par chromatographie en phase gazeuse - Partie 5: Methode isotherme pour I'azote, le dioxyde de carbone, les hydrocarbures C1 a C5 et C6+ Reference number IS0 6974-5:2014(E) LSO CopyrightInternationalOrganizationfor Standardization @ IS0 2014 t license from IHS Not for Resale IS0 6974-5:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2014 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 Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 6974-5:2014(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Principle 4 Materials ..4 5 Apparatus ..4 6 Scheme of the configuration 7 Procedure .7 7.1 Control of the apparatus. ..7 7.2 Operation of the apparatus ..8 8 Expression of results .11 8.1 Uncertainty .11 8.2 Test report. ..11 Annex A (informative) Example of application ..12 Annex B (informative) Procedure for Setting Valve timings and Restrictor Setting .22 Bibliography .24 iii se with IS thout license from IHS Not for Resale