ISO INTERNATIONAL STANDARD 10156 Fourth edition 2017-07 Gas cylinders Gases and gas mixtures Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets Bouteilles a gaz Gaz et mélanges de gaz - Détermination du potentiel d'inflammabilite et d'oxydation pour le choix des raccords de sortie de robinets Reference number IS0 10156:2017(E) International Organization for Standardization HEJIANG INST OF STANDARDIZATION C1 5956617 @IS02017 ed without license from IHS IS0 10156:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland 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. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ07 -All rights reserved Not for Resale, 2017/9/27 05:43:08 etworking permitted without license from IHS IS0 10156:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms, definitions, symbols and units ..1 4 Flammability of gases and gas mixtures in air .3 4.1 General .3 4.2 Testmethod .3 4.2.1 Key points concerning safety .3 4.2.2 Principle.. .4 4.2.3 Test apparatus and materials. 4 4.2.4 Procedure for determination of flammability .5 4.2.5 Procedure for determination of flammability limits .5 4.2.6 Results for pure gases. .5 4.3 Calculation method for flammability of gas mixtures containing n flammable gases and p inert gases. .8 4.4 Examples.. 11 4.5 Calculation method for lower flammability limit of gas mixtures .12 4.5.1 General. 4.5.2 Mixtures of flammable gases and mixtures of flammable gases with nitrogenand/orair ..13 4.5.3 Mixtures of flammable gases with inert gases other than nitrogen and air ..13 4.6 Examples. .13 4.7 Classification according to the Globally Harmonized System (GHS) ..15 5 Oxidizing power of gases and gas mixtures. ..15 5.1 General .15 5.2 Test method 15 5.2.1 Key points concerning safety .15 5.2.2 Principle 15 5.2.3 Test apparatus. .16 5.2.4 Procedure.. .19 5.2.5 Results. .19 5.3 Calculation method 19 5.3.1 Principle 19 5.3.2 Cicoefficients .20 6 Mixtures containing oxygen and flammable gases .21 6.1 General. .21 6.2 Basis of flammability classification .22 6.3 Examples 24 Annex A (informative) Classification according to the Globally Harmonized System (GHS) ..26 Bibliography .27 iii =ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS