ISO INTERNATIONAL STANDARD 7866 Second edition 2012-09-01 GascylindersRefillableseamless aluminiumalloygascylinders-Design, constructionand testing Bouteilles agaz-Bouteilles agaz sans soudure en alliage d'aluminium destinees a etre rechargees-Conception, construction et essais Referencenumber ISO7866:2012(E) ISO2012 ISO7866:2012(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 address below or ISO's member body in the country of the requester. ISO copyright office Casepostale56.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 ii @ IsO2012-All rights reserved ISO7866:2012(E) Contents Page Foreword Introduction. Scope. 2 Normative references.... 3 Terms and definitions.. 4 Symbols. 5 Inspection and testing ..... 6 6.1 General requirements. 6.2 Thermaltreatments. 6.3 Test requirements ... 6.4 Failuretomeettest requirements................... 7 7.1 General requirements 7.2 Calculation of cylindrical shell thickness.. 7.3 Design ofends (heads and bases) 7.4 Neck design ... 7.5 Foot rings.. 11 7.6 Neck rings. 11 7.7 11 7.8 High-strengthand/orlow-elongationgascylinderdesigns.. 11 8 Constructionandworkmanship 11 8.1 General. 11 8.2 End forming ..... 11 8.3 Wall thickness. 8.4 Surfaceimperfectionsanddefects. 8.5 Neckthreads 12 8.6 Out-of-roundness 12 8.7 Exposure to heat. 8.8 Straightness... 8.9 Mean diameter 13 9 Typeapprovalprocedure..... 13 9.1 General requirements..... 9.2 Prototypetests.. ..14 9.3 Type approval certificate... 10 Batchtests 15 10.1 General requirements .15 10.2 Tensile test..... 10.3 Bend test and flattening test... 18 10.4 Hydraulic burst test.. 19 10.5 Testrequirements forhigh-strength and/orlow-elongation gas cylinder designs. 11 Gascylindertestsand examinations. 11.1 General.. .22 11.2 Hydraulic test.. 11.3 Hardness test... .23 11.4 Leakage testing IsO2012-Allrightsreserved ili