BS ISO BRITISH STANDARD 20703:2006 Gas cylinders Refillable welded aluminium-alloy cylinders Design. construction and testing ICS 23.020.30 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSIS020703:2006 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 20703:2006. The UK participation in its preparation was entrusted by Technical Committee PVE/3, Gas containers, to Subcommittee PVE/3/3, Transportable gas containersCylinder design, construction and testing at the time of manufacture. Alist of organizations represented onPVE/3/3can beobtainedonrequest toits 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 Amendmentsissuedsincepublication published underthe authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on30April2007 BSI 2007 ISBN9780580505201 BS ISO 20703:2006 ISO INTERNATIONAL STANDARD 20703 First edition 2006-05-01 Gas cylinders Refillable welded aluminium-alloy cylinders Design, construction and testing Bouteilles a gaz-Bouteilles rechargeables soudees en alliage d'aluminium-Conception,constructionetessais Referencenumber ISO 20703:2006(E) ii BSISO20703:2006 Contents Page Foreword. Introduction. .vi 1 Scope 2 Normative references... 3 Terms,definitions and symbols. 3.1 Terms and definitions.... 3.2 Symbols...... 4 4.1 Generalprovisions 4.2 Heat treatment... 4.3 Gas/material compatibility.... 5 Design... 5.1 General provisions .... 5.2 Calculationofwallthickne 5.3 Designofconvexends (headsand bases) 5.4 Neck design.... 5.5 Foot-rings...... 5.6 Neck-rings 12 5.7 Shroud 5.8 Design drawing.... 9 Construction and workmanship.. 6.1 Seamless bodies.......... 6.2 Welding... 12 6.3 Non-destructiveexaminationofwelds... 6.4 Surface defects ... 6.5 Neck threads.... 13 6.6 Out-of-roundness. 6.7 Straightness 6.8 Eccentricity.. 6.9 Stability. 14 7 Tests and examinations .... 14 7.1 General.... 14 7.2 Mechanicaltests. 7.3 Hydraulic burst test ... 21 7.4 Pressure-cycling test... 23 7.5 Hydraulic test... 24 7.6 Check onthe homogeneity of abatch.... 7.7 24 7.8 Capacity check.... 24 7.9 Examination for neck folds... 24 8 Conformity evaluation.. 25 9 Identification marks... 25 10 Records. 25 AnnexA (normative) Corrosiontests .... ..26 AnnexB(normative)Newdesign typetestingandproductiontesting 40 ili BSIS020703:2006 Annex C (normative)Description,evaluation ofmanufacturing defects and conditionsfor AnnexD (informative) Examples of new design type approval and production test certificates ...... 48 Bibliography iv BSIS020703:2006 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 beer InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization adopted by the technical committees are circulated to the member bodies for voting. Publication as an rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 20703 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 3, Cylinder design. model regulations for the transportation of dangerous goods ST/SG/AC.10/1/Rev.13. It is intended to be used