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ISO INTERNATIONAL STANDARD 4126-3 Second edition 2020-09 Safety devices for protection against excessivepressure- Part 3: Safety valves and bursting disc safety devices in combination Dispositifs de sécurite pour protection contre les pressions excessives- Partie 3: Soupapes de surete et dispositifs de strete a disque de rupture en combinaison Reference number IS0 4126-3:2020(E) ISO @ISO 2020 IS04126-3:2020(E) COPYRIGHTPROTECTEDDOCUMENT @IS02020 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 below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS0 4126-3:2020(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Symbols. 5 Designof combination 6 Installationofcombination ..5 ..5 7 Combinationperformance 8 Determination of combination discharge capacityfactor, Fa,bytesting .6 8.1 General .6 8.2 Test requirements .6 8.3 Test rig. .6 8.4 Test method .7 8.5 .7 Test procedure. 8.6 Acceptance criteria of the tests .7 8.6.1 General .7 8.6.2 Conditions applicable to the safety valve .8 8.6.3 Conditionsapplicableto theburstingdisc safetydevice .8 8.6.4 Conditionsapplicableto combination .8 9 Derivation ofcombinationdischargecapacityfactor, Fa 10 Alternativetotesting forFa ..9 11 Certificationofcombination dischargecapacityfactor, Fa 12 Application and use of the certified combination discharge capacity factor, Fa .9 13 Markingandidentificationofcombinationdevices. .9 13.1 .9 Burstingdiscsafetydevice 13.2 .10 Safetyvalve 13.3 Combination ..10 14 Documentation .10 15 Preparation for storage and transport .11 IS02020-Allrightsreserved ili

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