ISO INTERNATIONAL 2928 STANDARD Fourth edition 2021-01 Rubber hoses and hose assemblies for liquefied petroleum gas (LPG) in the liquid or gaseous phase and natural gas up to 2,5 MPa (25 bar) - Specification Tuyaux et flexibles en caoutchouc pour gaz de peétrole liquefié (GPL) en phase liquide ougazeuse et le gaz naturel jusqu'a 2,5 MPa (25 bar)—Spécifications Reference number ISO 2928:2021(E) ISO @ ISO 2021 IS0 2928:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 below or Iso's member body in the country of the requester. ISO copyright office CP 40i: Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland i IS0 2021-All rights reserved IS02928:2021(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normative references ..1 3 Terms and definitions ..2 4 Classification .2 5 Materialsand constructionofhoseandhoseassembly .2 6 Dimensions .3 6.1 Nominal size,inside diameter,outside diameter,minimumbend radius .3 6.2 Minimumthickness of liningand cover 4 6.3 Concentricity .4 6.4 Tolerances in length. .4 7 Physical properties. .4 7.1 Compounds. ..4 7.2 Finished hose and hose assemblies .5 8 Electrical resistance ..6 9 Frequency oftesting .7 Marking 10 ..7 10.1 Hoses .7 10.2 Hoseassemblies ..8 Annex A (normative) Flammabilitytest. .9 AnnexB (normative)Frequencyoftestingfortypetestsandroutinetests .11 AnnexC (informative)Recommendedfrequencyoftestingforproductionacceptancetests ..12 @ IS0 2021 - All rights reserved iii