ISO INTERNATIONAL STANDARD 14520-15 Third edition 2015-02-15 Gaseous fire-extinguishing systems - Physical properties and system design - Part 15: IG-541 extinguishant Systemes d'extinction d'incendie utilisant des agents gazeux- Propriétésphysiqueset conception des systemes Partie15:AgentextincteurIG-541 Reference number IS0 14520-15:2015(E) TSO @ ISO 2015 IS014520-15:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015 All rights reserved. Unless otherwise specified, 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 Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii IS02015-All rights reserved IS0 14520-15:2015(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normativereference 3 Terms and definitions 4 Characteristics and uses. 4.1 General .1 4.2 Use of IG-541 systems 5 Safety of personnel 6 System design ..7 6.1 Fill pressure .7 6.2 Superpressurization. ..7 6.3 Extinguishant quantity .8 7 EnvironmentalProperties. .8 @ IS0 2015 - All rights reserved ili IS014520-15:2015(E) Foreword Iso (theInternational Organization for Standardization)is a worldwidefederation of national standards bodies (so member bodies).The work of preparing International Standards is normally carried out through Iso technical committees.Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,governmental and non-governmental, in liaison with IsO, also takepart in the work. ISo collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the IsO/IEc Directives, Part 1. In particular the different approval criteria needed for the different types of Iso documents should be noted. This document was drafted in accordance with the editorialrules of theIso/IEC Directives, Part2 (see www.iso.org/directives). Attention isdrawntothepossibilitythat some ofthe elements of this document maybethesubject of patent rights.IsO shall notbe held responsible for identifyingany or all such patent rights.Details ofany patent rights identified during the development ofthe document will be in the Introduction and/or on the Iso list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constituteanendorsement. For an explanation on the meaning of Iso specific terms and expressions related to conformity assessment,as wellasinformationaboutIsO's adherencetotheWTOprinciples intheTechnicalBarriers to Trade (TBT), see the following URL: Foreword - Supplementary information Thecommitteeresponsibleforthis documentisIso/Tc21,Equipmentforfireprotectionandfirefighting, Subcommittee SC 8, Gaseous media firefighting systems using gas This third edition cancels and replaces the second edition (IS0 14520-15:2005), which has been technically revised. Iso 14520 consists of the following parts, under the general title Gaseous fire-extinguishing systems - Physicalpropertiesandsystemdesign: Part 1: General requirements Part2:CF3l extinguishant Part 5:FK-5-1-12 extinguishant Part 6:HCFC Blend A extinguishant Part8:HFC125 extinguishant Part9:HFC227ea extinguishant Part10:HFC23extinguishant Part11:HFC236fa extinguishant Part12:IG-01extinguishant -Part13:IG-100extinguishant Part14:IG-55extinguishant Part15:IG-541extinguishant Parts 3, 4, and 7, which dealt with FC-2-1-8, FC-3-1-10, and HCFC 124 extinguishants, respe