BS ISO 6145-2:2014 BSl Standards Publication Gas analysis Preparation of calibration gas mixtures using dynamic methods Part 2: Piston pumps bsi. ..making excellence a habit. BRITISH STANDARD BSISO 6145-2:2014 National foreword This British Standard is the UK implementation of Is0 6145-2:2014. It supersedes BS ISO 6145-2:2001 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural Gas and Gas Analysis. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @The British Standards Institution2014.Published by BSI Standards Limited 2014 ISBN 978 0580700811 ICS 71.040.40 Compliance with a British Standard cannot confer immunityfrom legal obligations. This British Standard was published under the authority of the StandardsPolicy andStrategyCommitteeon31July2014. Amendments issued since publication Date Textaffected BS ISO 6145-2:2014 INTERNATIONAL ISO STANDARD 6145-2 Second edition 2014-08-15 Gas analysis Preparation of calibration gas mixtures using dynamic methods Part 2: Piston pumps Analysedes gaz-Préparation des melanges degaz pour étalonnage a I'aidedeméthodesvolumétriquesdynamiques Partie2:Pompesapiston Referencenumber IS0 6145-2:2014(E) TSO @IS02014 BSISO 6145-2:2014 IS06145-2:2014(E) Licensed copy:Imperial College, COPYRIGHTPROTECTEDDOCUMENT IS02014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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-1211Geneva20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland i @ IS0 2014 - All rights reserved BS ISO 6145-2:2014 IS0 6145-2:2014(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normative references 3 Terms and definitions 4 Symbols ..2 5 Principle and equipment ..3 5.1 Principle. .3 5.2 Equipment. .3 Calibration gas mixture preparation 6 .5 6.1 Safetyissues .5 6.2 Mixturefeasibility .6 6.3 Preparationsystemandsetting-upofmixturecomposition .7 6.4 .7 Inputpressurecontrol 6.5 Temperature control. .7 6.6 Homogenization .7 6.7 Stability. .8 6.8 Output pressureand flow pulsation .8 6.9 Composition oftheparentgases .8 7 Calculation of volume fractions and associated uncertainty evaluation .9 7.1 Calculation method A .9 7.2 Calculation method B .10 8 Gasmixturecompositionverification .12 ..13 AnnexA(normative)Amount-of-substancefractions AnnexB (informative) Uncertainty evaluation ofthegas mixturecomposition ..15 AnnexC (informative)Gasmixtureverification .21 AnnexD(informative)Numericalexample .25 Bibliography .30 IS0 2014-All rights reserved ili BSISO6145-2:2014 IS0 6145-2:2014(E) Foreword Iso (the International Organization for Standardization) isa worldwidefederation ofnational standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees.Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,governmental and non-governmental, in liaison with Iso,also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the Iso/IEc Directives, Part 1.In particular the different approval criteria needed for the different types of Iso documents should be noted. This document was drafted in accordance with the se editorial rules oftheISO/IECDirectives, Part2.www.iso.org/directives Attention isd