ISO INTERNATIONAL STANDARD 12991 First edition 2012-11-15 Liquefied natural gas (LNG) Tanks for on-board storage as a fuel for automotive vehicles Gaz naturel liquefié (GNL) - Réservoirs pour le stockage a bord comme carburant pour véhicules automobiles Reference number IS0 12991:2012(E) LSO @ISO2012 HS under No repr ted without license from IHS Not for Resale IS0 12991:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IsO at the addressbeloworIso'smemberbodyinthecountryoftherequester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel.+41227490111 Fax +41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2012 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 12991:2012(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. 2 Normative references ..1 3 Terms and definitions 4 Requirements .3 4.1 General requirements .3 4.2 Mechanical stresses .3 4.3 Thermal stresses 4 4.4 Materials. 4.5 Design 5 4.6 Insulation General requirements .6 4.7 Accessories .6 4.8 Manufacturing and assembly .7 5 Type tests .7 5.1 Approval of new designs .7 5.2 Inner tank burst pressure test. .8 5.3 Holding time test. .8 5.4 Maximum fuelling level test. 5.5 Accessory type tests. ..8 6 Routine tests and inspection 6.1 General. 6.2 Pressuretest 9 6.3 Leaktest 6.4 Verification of the dimensions. .9 6.5 Destructive and non-destructive tests of welded joints ..9 6.6 Visual inspection ..10 7 Marking and labelling .10 7.1 Marking method .10 7.2 Inner tank markings .10 7.3 Outer jacket markings .10 7.4 Temporary markings for first fuelling ..10 Annex A (normative) Fuel tank type tests ..12 Annex B (normative) Accessory type tests ..14 Bibliography ..16 ii ded by IHS under lic cense with ISt ed without license from IHS Not for Resale