1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21098-4 SANS 14520-6:2008Edition 2ISO 14520-6:2006Edition 2SOUTH AFRICAN NATIONAL STANDARD Gaseous fire-extinguishing systems Physical pro
4、perties and system design Part 6: HCFC blend A extinguishant This national standard is the identical implementation of ISO 14520-6:2006 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private
5、Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 14520-6:2008 Edition 2 ISO 14520-6:2006 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 21C, Fire safety Fixed fire detec
6、tion and extinguishing systems, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in September 2008. This SANS document supersedes SABS ISO 14520-6:2000 (edition 1). INTERNATIONALSTANDARDISO14520-6Secon
7、d edition2006-02-15Reference numberISO 14520-6:2006(E) ISO 2006Gaseous fire-extinguishing systems Physical properties and system design Part 6:HCFC Blend A extinguishantSystmes dextinction dincendie utilisant des agents gazeux Proprits physiques et conception des systmes Partie 6: Agent extincteur H
8、CFC, mlange ASANS 14520-6:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-6:2006(E)ii ISO 2006 All rights reservedPDF disclaimerThis PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file
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11、le is suitable for use by ISO member bodies. In theunlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form o
12、r by any means,electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below orISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail
13、copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandSANS 14520-6:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-6:2006(E) ISO 2006 All rights reserved iiiForewordISO (the International Organization for Standardization) is a
14、worldwide federation of national standards bodies(ISO member bodies). The work of preparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on
15、 that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in
16、accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requ
17、ires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 14520-6 was prepared by Technica
18、l Committee ISO/TC 21, Equipment for fire protection and fire fighting,Subcommittee SC 8, Gaseous media and firefighting systems using gas.This second edition cancels and replaces the first edition (ISO 14520-6:2000), which has been technicallyrevised.ISO 14520 consists of the following parts, under
19、 the general title Gaseous fire-extinguishing systems Physical properties and system design: Part 1: General requirements Part 2: CF I extinguishant Part 5: FK-5-1-12 extinguishant Part 6: HCFC Blend A extinguishant Part 8: HFC 125 extinguishant Part 9: HFC 227ea extinguishant Part 10: HFC 23 exting
20、uishant Part 11: HFC 236fa extinguishant Part 12: IG-01 extinguishant Part 13: IG-100 extinguishant Part 14: IG-55 extinguishant Part 15: IG-541 extinguishantParts 3, 4 and 7, which dealt with FC-2-1-8, FC-3-1-10 and HCFC 124 extinguishants, respectively, have beenwithdrawn, as these types are no lo
21、nger manufactured.3SANS 14520-6:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ivSANS 14520-6:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 14520-
22、6:2006(E) ISO 2006 All rights reserved 1Gaseous fire-extinguishing systems Physical properties and system design Part 6:HCFC Blend A extinguishant1ScopeThis part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to theHCFC Blend A extinguishant. It include
23、s details of physical properties, specification, usage and safety aspectsand is applicable to systems operating at nominal pressures of 25 bar and 42 bar, superpressurized withnitrogen. This does not preclude the use of other systems.2 Normative referencesThe following referenced documents are indis
24、pensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO 14520-1:2006, Gaseous fire-extinguishing systems Physical properties and system design Part
25、1:General requirements3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 14520-1 apply.4Characteristics and uses4.1 GeneralExtinguishant HCFC Blend A shall comply with the specification according to Table 1. The tolerances of itscomponents shall be in ac
26、cordance with Table 2.HCFC Blend A is a colourless, electrically non-conductive gas with a citrus-like odour and a densityapproximately 11 times that of air.The physical properties are given in Table 3.HCFC Blend A extinguishes fires mainly by physical means, but also by some chemical means.SANS 145
27、20-6:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-6:2006(E)2 ISO 2006 All rights reserved4.2 Use of HCFC Blend A systemsHCFC Blend A total flooding systems may be used for extinguishing fires of all classes within the limits
28、specifiedin ISO 14520-1:2006, Clause 4.The extinguishant requirements per volume of protected space are given in Table 4 for various levels ofconcentration. These are based on methods given in ISO 14520-1:2006, 7.6.The extinguishing concentrations and design concentrations for heptane and Surface cl
29、ass A hazards are givenin Table 5, and inerting concentrations in Table 6.Table 1 Specification for HCFC Blend AProperty RequirementPurity by mass, min.Acidity by mass (3 ppm), max.Water content by mass (10 ppm), max.Non-volatile residue by mass, max.Suspended matter or sediment None visibleTable 2
30、HCFC Blend A components and tolerancesComponent Tolerance(by mass)CHCl2CF3CHClF2CHClFCF3C10H16Table 3 Physical properties of HCFC Blend AProperty Unit ValueMolecular mass 92,9Boiling point at 1,013 bar (absolute) aFreezing pointCritical temperature 125Critical pressure bar abs a66,50Critical volume
31、cm3/mol 170Critical density kg/m3580Vapour pressure bar abs a8,25Liquid density kg/m31 200Saturated vapour density kg/m331Specific volume of superheated vapour at 1,013 bar and m3/kg 0,259Chemical formulaeComponentCHCl2CF34,75CHClF282CHClFCF39,5C10H163,75a; .99,6 %3 104%10 104%0,01 % 0,5 0,8 0,9 0,5
32、C 38,3C 1050 % 4h50C20C1 bar = 0,1 MPa = 105Pa 1MPa= 1 N/mm250C20C1 bar = 0,1 MPa = 105Pa 1MPa= 1 N/mm260 106%parenleftbig25+1,250parenrightbig parenleftbig42+2,10parenrightbig20CSANS 14520-6:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS
33、 .ISO 14520-6:2006(E)6 ISO 2006 All rights reserved6.3 Extinguishant quantityThe quantity of extinguishant shall be the minimum required to achieve the design concentration within thehazard volume at the minimum expected temperature, determined using Table 4 and the method according toISO 14520-1:20
34、06, 7.6.The design concentrations shall be those specified for relevant hazards in Table 5, including a 1,3 safety factoron the extinguishing concentration. Consideration should be given to increasing this factor for particularhazards, while seeking advice from the relevant authority.Keytemperature,
35、 pressure, barFigure 1 Temperature/pressure graph for HCFC Blend A Superpressurized with nitrogen to 25 bar at XCY20CSANS 14520-6:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-6:2006(E) ISO 2006 All rights reserved 7Keytemperature, pressure, barFigure 2 Temperature/pressure graph for HCFC Blend A Superpressurized with nitrogen to 42 bar at XCY20CSANS 14520-6:2008 SABSThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .
