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 978-0-626-21105-9 SANS 14520-14:2008 Edition 2 ISO 14520-14:2005 Edition 2SOUTH AFRICAN NATIONAL STANDARD Gaseous fire-extinguishing systems Physica
4、l properties and system design Part 14: IG-55 extinguishant This national standard is the identical implementation of ISO 14520-14:2005 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 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 14520-14:2008 Edition 2 ISO 14520-14:2005 Edition 2 Table of changes Change No. Date Scope National forewo
6、rd This South African standard was approved by National Committee SABS SC 21C, Fire safety Fixed fire detection 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
7、2008. This SANS document supersedes SABS ISO 14520-14:2000 (edition 1). This standard may only be used and printed by approved subscription and freemailing clients of the SABS. Reference number ISO 14520-14:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 14520-14 Second edition 2005-12-15 Gaseous fire-ex
8、tinguishing systems Physical properties and system design Part 14: IG-55 extinguishant Systmes dextinction dincendie utilisant des agents gazeux Proprits physiques et conception des systmes Partie 14: Agent extincteur IG-55 SANS 14520-14:2008This standard may only be used and printed by approved sub
9、scription and freemailing clients of the SABS.ISO 14520-14:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes 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
10、 on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products
11、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 the unlikely event that a problem relating to it is found, pleas
12、e inform the Central Secretariat at the address given below. ISO 2005 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
13、from either ISO at the address below or ISOs 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 copyrightiso.org Web www.iso.org ii ISO 2005 All rights reservedSANS 14520-14:2008This standard may onl
14、y be used and printed by approved subscription and freemailing clients of the SABS.ISO 14520-14:2005(E) ISO 2005 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
15、 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 liais
16、on with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of te
17、chnical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is dr
18、awn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 14520-14 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting, Subcomm
19、ittee SC 8, Gaseous media and firefighting systems using gas. This second edition cancels and replaces the first edition (ISO 14520-14:2000), which has been technically revised. ISO 14520 consists of the following parts, under the general title Gaseous fire-extinguishing systems Physical properties
20、and system design: Part 1: General requirements Part 2: CF 3 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 extinguishant Part 11: HFC 236fa extinguishant Part 12: IG-01 extinguishant Pa
21、rt 13: IG-100 extinguishant Part 14: IG-55 extinguishant Part 15: IG-541 extinguishant Parts 3, 4 and 7, which dealt with FC-2-1-8, FC-3-1-10 and HCFC 124 extinguishants, respectively, have been withdrawn, as these types are no longer manufactured. SANS 14520-14:2008This standard may only be used an
22、d printed by approved subscription and freemailing clients of the SABS.SANS 14520-14:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.INTERNATIONAL STANDARD ISO 14520-14:2005(E) ISO 2005 All rights reserved 1 Gaseous fire-extinguishing syste
23、ms Physical properties and system design Part 14: IG-55 extinguishant 1 Scope This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the IG-55 extinguishant. It includes details of physical properties, specification, usage and safety aspects and is
24、 applicable to systems operating at nominal pressures of 150 bar, 200 bar and 300 bar, at 15 C. This does not preclude the use of other systems; however, design data for other pressures were not available at time of publication. 2 Normative references The following referenced documents are indispens
25、able for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 14520-1: 1) , Gaseous fire-extinguishing systems Physical properties and system design Part 1
26、: General requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 14520-1 apply. 4 Characteristics and uses 4.1 General Extinguishant IG-55 shall comply with the specification according to Table 1. IG-55 is a colourless, odourless, electrically
27、non-conductive gas with a density approximately the same as that of air. It is an inert gas mixture consisting nominally of 50 % argon and 50 % nitrogen with the following mixture specification. a) Argon: range of (50 5) %. b) Nitrogen: range of (50 5) %. The physical properties are given in Table 2
28、. IG-55 extinguishes fires by a reduction of the oxygen concentration in the atmosphere of the hazard enclosure. 1) To be published. (Revision of ISO 14520-1:2000) SANS 14520-14:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 14520-14:2
29、005(E) 2 ISO 2005 All rights reservedTable 1 Specification for IG-55 Requirement Property Argon Nitrogen Purity 99,9 % 99,9 % Water content 15 10 6 10 10 6Only principal contaminants are shown. Other measurements may include hydrocarbons, CO, NO, NO 2 , CO 2 , etc. Most are 20 10 6 . Table 2 Physica
30、l properties of IG-55 Property Unit Value Molecular mass 33,98 Boiling point at 1,013 bar (absolute) aC Freezing point C Critical temperature C Critical pressure bar abs a Critical volume cm 3 /mol Critical density kg/m 3 Vapour pressure 20 C bar abs a Liquid density 20 C kg/m 3 Saturated vapour den
31、sity 20 C kg/m 3 Specific volume of superheated vapour at 1,013 bar and 20 C m 3 /kg 0,708 Chemical formulas N 2 50 % by volume Ar 50 % by volume Chemical names Nitrogen Argon a1 bar = 0,1 MPa = 10 5Pa; 1 MPa = 1 N/mm 2 . 4.2 Use of IG-55 systems IG-55 total flooding systems may be used for extingui
32、shing fires of all classes within the limits specified in ISO 14520-1: 2) , Clause 4. The specific vapour volumes are shown in Table 3. The quantity, Q, of agent required per volume of protected space is determined using the equation in Table 3. The extinguishing concentrations and design concentrat
33、ions for n-heptane and Surface Class A hazards are given in Table 4, and concentrations for other fuels in Table 5. 2) To be published. (Revision of ISO 14520-1:2000) SANS 14520-14:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 14520-1
34、4:2005(E) ISO 2005 All rights reserved 3 Table 3 IG-55 specific vapour volumes Temperature Specific vapour volume Temperature Specific vapour volume T S T S C m 3 /kg C m 3 /kg 40 0,5632 30 0,7323 35 0,5752 35 0,7444 30 0,5873 40 0,7564 25 0,5994 45 0,7685 20 0,6115 50 0,7806 15 0,6236 55 0,7927 10
35、0,6356 60 0,8048 5 0,6477 65 0,8168 0 0,6598 70 0,8289 5 0,6719 75 0,8410 10 0,6840 80 0,8531 15 0,6960 85 0,8652 20 0,7081 90 0,8772 25 0,7202 95 0,8893 30 0,7323 100 0,9014 This information refers only to IG-55, and may not represent any other products containing nitrogen and argon as components.
36、The quantity Q (in cubic metres) of agent required at a reference temperature of 20 C and a pressure of 1,013 bar per cubic metre of protected volume to produce the indicated concentration at the temperature specified is calculated from: RR Qm S = where S Ris the specific reference volume (in cubic
37、metres per kilogram); i.e. the specific vapour volume at the filling reference temperature for superheated IG-55 vapour at a pressure of 1,013 bar which may be approximated by the formula: R12R SkkT =+ where k 1= 0,659 8; k 2= 0,002 416; T Ris the reference temperature (in degrees Celsius), i.e. fil
38、ling temperature (20 C in the table); 100 In 100 V m Sc = V is the net volume of hazard (in cubic metres); i.e. the enclosed volume minus the fixed structures impervious to extinguishant; T is the temperature (in degrees Celsius); i.e. the design temperature in the hazard area; S is the specific vol
39、ume (in cubic metres per kilogram); the specific volume of superheated IG-55 vapour at a pressure of 1,013 bar may be approximated by 12 SkkT =+ c is the concentration (in percent); i.e. the volumetric concentration of IG-55 in air at the temperature indicated, and a pressure of 1,013 bar absolute.
40、SANS 14520-14:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 14520-14:2005(E) 4 ISO 2005 All rights reservedTable 4 IG-55 reference extinguishing and design concentrations Fuel Extinguishment % by volume Minimum design % by volume Clas
41、s B Heptane (cup burner) Heptane (room test) 36,5 30,2 47,5 Surface Class A Wood crib PMMA PP ABS 28,7 30,7 29,3 31,0 40,3 Higher Hazard Class A a 45,1 The extinguishment values for the Class B and the Surface Class A fuels are determined by testing in accordance with ISO 14520-1: 3) , Annexes B and
42、 C. The minimum design concentration for the Class B fuel is the higher value of the heptane cup burner or room test heptane extinguishment concentration multiplied by 1,3. The minimum design concentration for Surface Class A fuel is the highest value of the wood crib, PMMA, PP or ABS extinguishment
43、 concentrations multiplied by 1,3. In the absence of any of the 4 extinguishment values, the minimum design concentration for Surface Class A shall be that of Higher Hazard Class A. See ISO 14520-1: 3) , 7.5.1.3, for guidance on Class A fuels. The extinguishing and design concentrations for room-sca
44、le test fires are for informational purposes only. Lower and higher extinguishing concentrations than those shown for room-scale test fires may be achieved and allowed when validated by test reports from internationally recognized laboratories.aThe minimum design concentration for Higher Hazard Clas
45、s A fuels shall be the higher of the surface Class A or 95 % of the Class B minimum design concentration. Table 5 IG-55 extinguishing and design concentrations for other fuels Fuel Extinguishment % by volume Minimum design % by volume Ethanol 38,9 50,6 n-Hexane 37,0 48,0 Isooctane 36,5 47,5 Methyl e
46、thyl ketone 38,0 49,4 Methanol 45,4 59,0 i-Propanol 36,5 47,5 Toluene 36,5 47,5 Extinguishing concentrations for all Class B fuels listed were derived in accordance with ISO 14520-1: 3) , Annex B. Minimum design values have been increased to the minimum design concentration established for heptane i
47、n accordance with ISO 14520-1: 3) , 7.5.1. 3) To be published. (Revision of ISO 14520-1:2000) SANS 14520-14:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISO 14520-14:2005(E) ISO 2005 All rights reserved 5 5 Safety of personnel Any hazard
48、 to personnel created by the discharge of IG-55 shall be considered in the design of the system. Potential hazards can arise from the following: a) the extinguishant itself, by oxygen reduction; b) the combustion products of the fire. For minimum safety requirements, see ISO 14250-1: 4) , Clause 5.
49、Physiological information for IG-55 is given in Table 6. Table 6 Physiological information for IG-55 Property Value % by volume No observed adverse effect level (NOAEL) 43 Lowest observed adverse effect level (LOAEL) 52 These values are based on physiological effects in human subjects of hypoxic atmospheres. These values are the functional equivalents of NOAEL and LOAEL values, and correspond to 12 % minimum oxygen for th
