ISO INTERNATIONAL STANDARD 18172-2 First edition 2007-03-01 Gas cylinders Refillable welded stainless steel cylinders Part 2: Test pressure greater than 6 MPa Bouteilles a gaz - Bouteilles soudées en acier inoxydable rechargeables - Partie 2:Pressiond'épreuve supéerieurea 6MPa Reference number ISO 18172-2:2007(E) @ ISO 2007 or Standardization with ISC No reproduction or networking pemitted without license from IHS Not for Resale ISO 18172-2:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In ?ISO2007 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 Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland CoDvriaht Inten @ ISO 2007 - All rights reserved vith ISC No reproduction or networking permitted without license from IHS Not fr esale ISO 18172-2:2007(E) Contents Page Foreword.. Introduction. vi 1 Scope 2 Normative references ... 3 Terms, definitions and symbols. 3.1 Terms and definitions.. 3.2 Symbols.... 4 Materials and heat treatment ....... 4.1 General... 4.2 Categories 4.3 Heat treatment... 4.4 Test requirements. 5 5 5.1 General requirements 5.2 Calculation of cylindrical shell wall thickness 5.3 Design of convex ends.... 6 5.4 Minimum wall thickness. 5.5 Ends of other shapes 5.6 Design of openings... 5.7 6 Construction and workmanship. 6.1 General... 6.2 Welding... 10 6.3 Cryoforming procedure... 6.4 Welded joints of pressure-containing parts 6.5 Non-pressure-containing attachments... 6.6 Valve protection.. 6.7 Neck threads ..... 6.8 Visual examination . 7 New design tests... 2 7.1 General requirements. 7.2 Verifications and tests.. 7.3 Descriptionsoftests 7.4 Design testing certificate ... 15 8 Batchtests.. 15 8.1 General.. 15 8.2 Information 8.3 Tensiletest 15 8.4 Bend test.... 18 8.5 Impacttest 20 8.6 Macroscopic examination of weld cross-sections. 21 8.7 Checks and verifications 21 9 Tests on every cylinder. 22 9.1 Pressure test ... 22 9.2 Hardnesstest 22 9.3 Leakagetest. 22 10 Failure to meet test requirements ... 22 Standardization'ghts reserved ii with ISC NoreproductionornetworkingpemttedwithoutlicensefromHS Not for Resale ISO 18172-2:2007(E) 11 Markings.. 22 12 Certificate... .23 Annex A (normative) Radiographic examination of welds.. .24 Annex B (normative) Description and evaluation of manufacturing defects and conditions for rejection of welded stainless steel gas cylinders at time of visual inspection ... 26 Annex C (informative) Examples of design and batch testing certificates.. .28 Bibliography .... .33 orStandardization @ IS0 2007 - All rights reserved with ISC No reproduction or networking permitted without license from IHS Not for Resale ISO 18172-2:2007(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeen non-governmental,inliaisonwithIsO,alsotakepart inthework.IsOcollaboratescloselywiththe International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requir