ISO INTERNATIONAL STANDARD 14520-10 Fourth edition 2019-07 Gaseous fire-extinguishing systems Physical properties and system design - Part 10: HFC 23 extinguishant Systemes d'extinction d'incendie utilisant des agents gazeux- Propriétesphysiquesetconceptiondes systemes Partie10:AgentextincteurHFC23 Reference number ISO 14520-10:2019(E) ISO @ IS0 2019 IS014520-10:2019(E) COPYRIGHTPROTECTEDDOCUMENT IS02019 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 on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or IsO's member body in the country of the requester: ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email:[email protected] Website: www.iso.org Published in Switzerland ii IS02019-Allrights reserved IS0 14520-10:2019(E) Contents Page Foreword iv 1 Scope 1 2 Normative references .1 3 Termsand definitions. .1 4 Characteristicsanduses .1 4.1 General 1 4.2 Use of HFC 23 systems. 2 5 Safety ofpersonnel 5 6 System design 5 6.1 Fill density 5 6.2 Superpressurization 6 6.3 Extinguishant quantity 6 6.4 Other fill density and superpressurization levels 8 7 Environmentalproperties 8 Bibliography .10 @ IS0 2019 - All rights reserved iii