BS ISO BRITISH STANDARD 18172-1:2007 Gas cylinders Refillable welded stainless steel cylinders - Part l: Test pressure 6 MPa and below ICS 23.020.30 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSIS018172-1:2007 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 18172-1:2007. The UK participation in its preparation was entrusted by Technical Committee PVE/3, Gas containers, to Subcommittee PVE/3/3, Transportable gas containers Cylinder design, construction and testing at the time of manufacture. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was Amendments issued sincepublication published under the authority of the Standards Policy and Date Amd. No. Comments Strategy Committee on 31May 2007 @BSI 2007 ISBN 9780580507649 BS ISO 18172-1:2007 ISO INTERNATIONAL STANDARD 18172-1 First edition 2007-03-01 Gas cylinders Refillable welded stainless steel cylinders - Part 1: Test pressure 6 MPa and below BouteillesagazBouteilles soudéesen acierinoxydable rechargeables- Partie 1:Pression d'épreuve de 6MPa et inferieure Reference number ISO 18172-1:2007(E) i BSISO18172-1:2007 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 4.2 Categories 4.3 Heat treatment.... 4.4 Test requirements.. 5 5.1 General requirements. 5.2 Calculation of cylindrical shell wall thickness ... 5.3 Design of convex ends... 5.4 Minimum wall thickness.. 5.5 Ends of other shapes ... 5.6 Design of openings.... 6 Constructionandworkmanship.. 6.1 General........ 9 10 6.2 6.3 Cryoforming procedure.. 10 6.4 Welded joints ofpressure-containing parts 10 6.5 Non-pressure-containing attachments....... 10 6.6 Valve protection.. 11 6.7 Neckthreads 11 6.8 Visual examination 7 New design tests.. 12 7.1 General requirements... 12 7.2 Verifications and tests.. 7.3 13 Descriptions oftests 7.4 Design testing certificate.... 14 8 Batchtests 14 8.1 14 8.2 Information 15 8.3 Tensile test. 15 8.4 18 8.5 Macroscopicexamination of weld cross-sections. 20 8.6 Checks and verifications.. 20 9 Tests on every cylinder. 21 9.1 Pressuretest 21 9.2 Hardness test.... 9.3 Leakagetest. 21 10 Failure to meet test requirements 21 11 Markings .. 22 ili BSIS018172-1:2007 12 Certificate.. AnnexA(normative)Radiographicexaminationofwelds. AnnexB (normative)Descriptionandevaluation ofmanufacturing defects and conditions for rejection of welded stainless steel gas cylinders at time of visual inspection ..... ..25 AnnexC(informative)Examples ofdesignandbatchtestingcertificates.. .27 Annex D (normative) Manufacturer's markings for LPG ...32 Bibliography. 33 iv BS ISO 18172-1:2007 Foreword IsO (the International Organization for Standardization)is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with Iso, also take part in the work. Iso collaborates closely with the InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEc Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject