ISO INTERNATIONAL STANDARD 9809-4 Second edition 2021-11 Gas cylinders Design, construction and testing of refillable seamless steel gas cylinders and tubes - Part 4: Stainless steel cylinders with an Rm value of less than 1 100 MPa Bouteilles a gaz - Conception, construction et essais des bouteilles a gaz et des tubes rechargeables en acier sans soudure Partie 4: Bouteilles en acier inoxydable avec une valeur Rm inférieure a 1 100 MPa Reference number IS0 9809-4:2021(E) ISO @ IS0 2021 IS0 9809-4:2021(E) COPYRIGHT PROTECTED DOCUMENT @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 on the internet or an intranet, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 -All rights reserved