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 978-0-626-21099-1 SANS 14520-8:2008Edition 2ISO 14520-8:2006Edition 2SOUTH AFRICAN NATIONAL STANDARD Gaseous fire-extinguishing systems Physical pro
4、perties and system design Part 8: HFC 125 extinguishant This national standard is the identical implementation of ISO 14520-8:2006 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X
5、191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 14520-8:2008 Edition 2 ISO 14520-8:2006 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 detection
6、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 14520-8:2000 (edition 1). INTERNATIONALSTANDARDISO14520-8Second edi
7、tion2006-02-15Reference numberISO 14520-8:2006(E) ISO 2006Gaseous fire-extinguishing systems Physical properties and system design Part 8:HFC 125 extinguishantSystmes dextinction dincendie utilisant des agents gazeux Proprits physiques et conception des systmes Partie 8: Agent extincteur HCFC 125SAN
8、S 14520-8:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-8:2006(E)ii ISO 2006 All rights reservedPDF disclaimerThis PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed o
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13、Web www.iso.orgPublished in SwitzerlandSANS 14520-8:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-8:2006(E) ISO 2006 All rights reserved iiiForewordISO (the International Organization for Standardization) is a worldwide federa
14、tion 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 that committee.
15、 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 accordance with
16、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 requires approval by
17、 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 14520-8 was prepared by Technical Committee ISO/
18、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 14520-8:2000), which has been technicallyrevised.ISO 14520 consists of the following parts, under the general tit
19、le 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 extinguishant Part 11:
20、 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 longer manufacture
21、d.3SANS 14520-8:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ivSANS 14520-8:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 14520-8:2006(E) ISO 20
22、06 All rights reserved 1Gaseous fire-extinguishing systems Physical properties and system design Part 8:HFC 125 extinguishant1ScopeThis part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to theHFC 125 extinguishant. It includes details of physical prop
23、erties, specification, usage and safety aspects and isapplicable to systems operating at nominal pressures of and , superpressurized with nitrogen.This does not preclude the use of other systems.2 Normative referencesThe following referenced documents are indispensable for the application of this do
24、cument. 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 1:General requirements3 Terms and defin
25、itionsFor the purposes of this document, the terms and definitions given in ISO 14520-1 apply.4Characteristics and uses4.1 GeneralExtinguishant HFC 125 shall comply with the specification according to Table 1.HFC 125 is a colourless, almost odourless electrically non-conductive gas with a density ap
26、proximately fourtimes that of air.The physical properties are given in Table 2.HFC 125 extinguishes fires mainly by physical means, but also by some chemical means.25 bar 42 barSANS 14520-8:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .
27、ISO 14520-8:2006(E)2 ISO 2006 All rights reserved4.2 Use of HFC 125 systemsHFC 125 total flooding systems may be used for extinguishing fires of all classes within the limits specified inISO 14520-1:2006, Clause 4.The extinguishant requirements per volume of protected space are given in Table 3 for
28、various levels ofconcentration. These are based on methods given in ISO 14520-1:2006, 7.6.The extinguishing concentrations and design concentrations for n-heptane and Surface class A hazards aregiven in Table 4, and those for other fuels in Table 5.Table 1 Specification for HFC 125Property Requireme
29、ntPurity 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 Physical properties of HFC 125Property Unit ValueMolecular mass 120,02Boiling point at 1,013 bar (absolute) aFreezing pointCritica
30、l temperature 66,02Critical pressure bar abs a36,18Critical volume cm3/mol 210Critical density kg/m3573,6Vapour pressure bar abs a12,05Liquid density kg/m31 218,0Saturated vapour density kg/m377,97Specific volume of superheated vapour at 1,013 bar and m3/kg 0,1972Chemical formula CF3CHF2Chemical nam
31、e Pentafluoroethanea; .99,6 %3 104%10 104%0,01 %C 48,09C 101C20C20C20C20C1 bar = 0,1 MPa = 105Pa 1 MPa = 1 N/mm2SANS 14520-8:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-8:2006(E) ISO 2006 All rights reserved 3Table 3 HFC 125
32、 total flooding quantityTemperature Specific vapour volume HFC 125 mass requirements per unit volume of protected space, (kg/m3) This information refers only to HFC 125, and may not represent any other products containing pentafluoroethane as a component.Design concentration (by volume)m3/kg0,1497 0
33、,5028 0,5809 0,6607 0,7422 0,8256 0,9109 0,9982 1,0874 1,1788 1,27240,1534 0,4907 0,5669 0,6447 0,7243 0,8057 0,8889 0,9741 1,0612 1,1504 1,24170,1572 0,4788 0,5532 0,6291 0,7068 0,7862 0,8675 0,9505 1,0356 1,1226 1,21170,1608 0,4681 0,5408 0,6151 0,6910 0,7686 0,8480 0,9293 1,0124 1,0975 1,18460,16
34、45 0,4576 0,5286 0,6012 0,6754 0,7513 0,8290 0,9084 0,9896 1,0728 1,15790,1682 0,4475 0,5170 0,5880 0,6606 0,7348 0,8107 0,8884 0,9678 1,0492 1,13240,1719 0,4379 0,5059 0,5753 0,6464 0,7190 0,7933 0,8693 0,9470 1,0266 1,10810,1755 0,4289 0,4955 0,5635 0,6331 0,7042 0,7770 0,8514 0,9276 1,0055 1,0853
35、0,1791 0,4203 0,4855 0,5522 0,6204 0,6901 0,7614 0,8343 0,9089 0,9853 1,06350 0,1828 0,4118 0,4757 0,5410 0,6078 0,6761 0,7460 0,8174 0,8905 0,9654 1,04205 0,1864 0,4038 0,4665 0,5306 0,5961 0,6631 0,7316 0,8016 0,8733 0,9467 1,021910 0,1900 0,3962 0,4577 0,5205 0,5848 0,6505 0,7177 0,7864 0,8568 0,
36、9288 1,002515 0,1935 0,3890 0,4494 0,5111 0,5742 0,6387 0,7047 0,7722 0,8413 0,9120 0,984420 0,1971 0,3819 0,4412 0,5018 0,5637 0,6271 0,6919 0,7581 0,8259 0,8953 0,966425 0,2007 0,3750 0,4333 0,4928 0,5536 0,6158 0,6794 0,7445 0,8111 0,8793 0,949130 0,2042 0,3686 0,4258 0,4843 0,5441 0,6053 0,6678
37、0,7318 0,7972 0,8642 0,932835 0,2078 0,3622 0,4185 0,4759 0,5347 0,5948 0,6562 0,7191 0,7834 0,8492 0,916640 0,2113 0,3562 0,4115 0,4681 0,5258 0,5849 0,6454 0,7072 0,7704 0,8352 0,901445 0,2149 0,3503 0,4046 0,4602 0,5170 0,5751 0,6345 0,6953 0,7575 0,8212 0,886350 0,2184 0,3446 0,3982 0,4528 0,508
38、8 0,5659 0,6244 0,6842 0,7454 0,8080 0,872155 0,2219 0,3392 0,3919 0,4457 0,5007 0,5570 0,6145 0,6734 0,7336 0,7953 0,858460 0,2254 0,3339 0,3858 0,4388 0,4930 0,5483 0,6050 0,6629 0,7222 0,7829 0,845165 0,2289 0,3288 0,3799 0,4321 0,4854 0,5400 0,5957 0,6528 0,7112 0,7710 0,832170 0,2324 0,3239 0,3
39、742 0,4256 0,4781 0,5318 0,5868 0,6430 0,7005 0,7593 0,819675 0,2358 0,3192 0,3688 0,4194 0,4712 0,5242 0,5783 0,6337 0,6904 0,7484 0,807880 0,2393 0,3145 0,3634 0,4133 0,4643 0,5165 0,5698 0,6244 0,6803 0,7374 0,796085 0,2428 0,3100 0,3581 0,4073 0,4576 0,5090 0,5616 0,6154 0,6705 0,7268 0,784590 0
40、,2463 0,3056 0,3531 0,4015 0,4511 0,5018 0,5536 0,6067 0,6609 0,7165 0,773495 0,2498 0,3013 0,3481 0,3959 0,4448 0,4948 0,5459 0,5982 0,6517 0,7064 0,7625is the agent mass requirement (in kilograms per cubic metre); i.e. mass, , in kilograms of agent required percubic metre of protected volume to pr
41、oduce the indicated concentration at the temperature specified;is the net volume of hazard (in cubic metres); i.e. the enclosed volume minus the fixed structures impervious toextinguishantis the temperature (in degrees Celsius); i.e. the design temperature in the hazard area;is the specific volume (
42、in cubic metres per kilogram); the specific volume of superheated HFC 125 vapour at apressure of 1,013 bar may be approximated bywhere ; is the concentration (in percent); i.e. the volumetric concentration of HFC 125 in air at the temperature indicated,and a pressure of 1,013 bar absolute.TSm/VC 7%
43、8% 9% 10 % 11 % 12 % 13 % 14 % 15 % 16 %45403530252015105m/V mVVm =parenleftBigc100 cparenrightBigVSTSS = k1+ k2Tk1= 0,182 5 k2= 0,000 7cSANS 14520-8:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 14520-8:2006(E)4 ISO 2006 All rights
44、 reservedTable 4 HFC 125 reference extinguishing and design concentrationsFuel Extinguishment Minimum designby volume by volumeClass BHeptane (cup burner) 9,3 12,1Heptane (room test) 9,3Surface Class AWood crib 6,7PMMA 8,6 11,2PP 8,6ABS 8,6Higher Hazard Class Aa11,5The extinguishment values for the
45、Class B and the Surface Class A fuels are determined by testing in accordance withISO 14520-1:2006, Annexes B and C.The minimum design concentration for the Class B fuel is the higher value of the heptane cup burner or room test heptaneextinguishment concentration multiplied by 1,3.The minimum desig
46、n concentration for Surface Class A fuel is the highest value of the wood crib, PMMA, PP or ABSextinguishment concentrations multiplied by 1,3. In the absence of any of the 4 extinguishment values, the minimum designconcentration for Surface Class A shall be that of Higher Hazard Class A.See ISO 145
47、20-1:2006, 7.5.1.3, for guidance on Class A fuels.The extinguishing and design concentrations for room-scale test fires are for informational purposes only. Lower and higherextinguishing concentrations than those shown for room-scale test fires may be achieved and allowed when validated bytest repor
48、ts from internationally recognized laboratories.aThe minimum design concentration for Higher Hazard Class A fuels shall be the higher of the Surface Class A or of the Class Bminimum design concentration.Table 5 HFC 125 extinquishing and design concentrations for other fuelsFuel Inertion Minimum desi
49、gnby volume by volumeAcetone 9,3 12,1Ethanol 11,3 14,7Ethyl acetate 9,3 12,1Methanol 12,3 15,9Kerosene 9,3 12,1Propane 9,7 12,6Toluene 9,3 12,1Extinguishing concentrations for Class B fuels derived in accordance with ISO 14520-1:2006, Annex B. Minimum designvalues have been increased to the minimum design concentration established for heptane in accordance withISO 14520-1:2006, 7.5.1.% %95 % %SANS 14520-8:2008This s tandard may only be used and printed by approved subscription and freema
