ISO INTERNATIONAL STANDARD 7291 Third edition 2010-11-01 Gas welding equipment Pressure regulators for manifold systems used in welding, cutting and allied processes up to 30 MPa (300 bar) Materiel de soudage aux gaz - Détendeurs de centrale de bouteilles pour le soudage, le coupage et les techniques connexes jusqua30MPa (300 bar) Reference number ISO 7291:2010(E) @ISO 2010 by IHS under lic ted without license from IHS Not for Resale ISO 7291:2010(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 shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In 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 COPYRIGHTPROTECTEDDOCUMENT @ISO2010 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 memberbody in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 4122749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2010 - All rights reserved I without license from IHS Not for Resale ISO 7291:2010(E) Contents Page Foreword .iv 1 Scope 2 Normative references 3 Termsand definitions. 4 Units. 4.1 Pressure. 4.2 4.3 Temperature 5 Manufacturing requirements. 5.1 Materials .... 5.2 Design, machining and assembly.... 6 Physical characteristics 6.1 General.. 6.2 Pressures.. 6.3 Flow rates. 6.4 Operating characteristics, 7 Marking. 10 7.1 Pressure regulator.... 7.2 Pressurereliefdevices .10 8 Instructionsforuse 9 Type test procedure 11 9.1 General 11 9.2 Test conditions... 11 9.3 Functional tests... 12 9.4 Tests for mechanical resistance of pressure regulators 9.5 Test for durability of markings......... 18 Bibliography. Copyright internatina organizaio for Standardizallon ghts reserved ii Not for Resale