1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58properties and system design Part 11: HFC 236fa extinguishantICS 13.220.10Gaseous fire-extinguishin
2、g systems Physical BRITISH STANDARDBS ISO14520-11:2005BS ISO 14520-11:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2006 BSI 2006ISBN 0 580 48321 5Cross-referencesThe British Standards which implement international publications r
3、eferred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary pro
4、visions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pag
5、es 1 to 7 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this subcommittee can be obtained on request to its secretary. present to the res
6、ponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 14520-11:2005 a
7、nd implements it as the UK national standard. It supersedes BS ISO 14520-11:2000 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee FSH/18, Fixed firefighting equipment, to Subcommittee FSH/18/6, Gaseous extinguishing media and systems, which has the resp
8、onsibility to: aid enquirers to understand the text;Reference numberISO 14520-11:2005(E)INTERNATIONAL STANDARD ISO14520-11Second edition2005-12-15Gaseous fire-extinguishing systems Physical properties and system design Part 11: HFC 236fa extinguishant Systmes dextinction dincendie utilisant des agen
9、ts gazeux Proprits physiques et conception des systmes Partie 11: Agent extincteur HFC 236fa BS ISO 14520-11:2005ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Sta
10、ndards 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
11、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 technical committees
12、 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 drawn to the possibi
13、lity 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 14520-11 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting, Subcommittee SC 8, Gaseou
14、s media and firefighting systems using gas. This second edition cancels and replaces the first edition (ISO 14520-11:2000), which has been technically revised. ISO 14520 consists of the following parts, under the general title Gaseous fire-extinguishing systems Physical properties and system design:
15、 Part 1: General requirements Part 2: CF3I 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 Part 13: IG-100 exting
16、uishant 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. BS ISO 14520-11:2005blank1Gaseous fire-extinguishing systems Physical p
17、roperties and system design Part 11: HFC 236fa extinguishant 1 Scope This part of ISO 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the HFC 236fa extinguishant. It includes details of physical properties, specification, usage and safety aspects and is appl
18、icable to systems operating at nominal pressures of 25 bar and 42 bar superpressurized with nitrogen. This does not preclude the use of other systems. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edit
19、ion 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: General requirements 3 Terms and definitions For the purposes of this document
20、, the terms and definitions given in ISO 14520-1 apply. 4 Characteristics and uses 4.1 General Extinguishant HFC 236fa shall comply with the specification according to Table 1. HFC 236fa is a colourless, almost odourless, electrically non-conductive gas with a density approximately five times that o
21、f air. The physical properties are given in Table 2. HFC 236fa extinguishes fires mainly by physical means, but also by some chemical means. 1) To be published. (Revision of ISO 14520-1:2000) BS ISO 14520-11:20052 Table 1 Specification for HFC 236fa Property Requirement Purity 99,6 % (mol/mol), min.
22、 Acidity 3 106by mass, max. Water content 10 106by mass, max. Non-volatile residue 0,01 % by mass, max. Suspended matter or sediment None visible Table 2 Physical properties of HFC 236fa Property Unit Value Molecular mass 152 Boiling point at 1,013 bar (absolute) aC 1,4 Freezing point C 103 Critical
23、 temperature C 124,9 Critical pressure bar abs a32,00 Critical volume cm3/mol 274,0 Critical density kg/m3551,3 Vapour pressure 20 C bar abs a2,296 Liquid density 20 C kg/m31 377 Saturated vapour density 20 C kg/m315,58 Specific volume of superheated vapour at 1,013 bar and 20 C m3/kg 0,1529 Chemica
24、l formula CHF3CH2CF3Chemical name Hexafluoropropane a1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2. 4.2 Use of HFC 236fa systems HFC 236fa total flooding systems may be used for extinguishing fires of all classes within the limits specified in ISO 14520-1: 2), Clause 4. The extinguishant requirements per
25、 volume of protected space are given in Table 3 for various levels of concentration. These are based on methods given in ISO 14520-1 2), 7.6. The extinguishing concentrations and design concentrations for various types of hazard are given in Table 4, and concentrations for other fuels in Table 5. 2)
26、 To be published. (Revision of ISO 14520-1:2000) BS ISO 14520-11:20053Table 3 HFC 236fa total flooding quantity HFC 236fa mass requirements per unit volume of protected space, m/V (kg/m3) This information refers only to HFC 236fa, and may not represent any other products containing 1,1,1,3,3,3-hexaf
27、luoropropane as a component. Temperature T Specific vapour volume S Design concentration (by volume) C m3/kg 5 % 6 % 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 % 0 0,1413 0,3725 0,4517 0,5327 0,6154 0,6999 0,7863 0,8747 0,9651 1,0575 1,1521 1,2489 5 0,1442 0,3650 0,4427 0,5220 0,6031 0,6860 0,7706 0,85
28、72 0,9458 1,0364 1,1291 1,2240 10 0,1471 0,3579 0,4340 0,5118 0,5913 0,6725 0,7555 0,8404 0,9273 1,0161 1,1070 1,2000 15 0,1499 0,3510 0,4257 0,5020 0,5799 0,6596 0,7410 0,8243 0,9095 0,9966 1,0857 1,1769 20 0,1528 0,3444 0,4177 0,4925 0,5690 0,6472 0,7271 0,8088 0,8923 0,9778 1,0652 1,1548 25 0,155
29、7 0,3380 0,4100 0,4834 0,5585 0,6352 0,7136 0,7938 0,8758 0,9597 1,0455 1,1334 30 0,1586 0,3319 0,4025 0,4746 0,5483 0,6237 0,7007 0,7794 0,8599 0,9423 1,0266 1,1128 35 0,1615 0,3260 0,3953 0,4662 0,5386 0,6125 0,6882 0,7655 0,8446 0,9255 1,0082 1,0930 40 0,1643 0,3203 0,3884 0,4580 0,5291 0,6018 0,
30、6761 0,7521 0,8298 0,9092 0,9906 1,0738 45 0,1672 0,3147 0,3817 0,4501 0,5200 0,5914 0,6645 0,7391 0,8155 0,8936 0,9735 1,0553 50 0,1701 0,3094 0,3752 0,4425 0,5112 0,5814 0,6532 0,7266 0,8017 0,8785 0,9570 1,0375 55 0,1730 0,3043 0,3690 0,4351 0,5027 0,5717 0,6423 0,7145 0,7883 0,8638 0,9411 1,0202
31、 60 0,1759 0,2993 0,3630 0,4280 0,4945 0,5624 0,6318 0,7028 0,7754 0,8497 0,9257 1,0035 65 0,1787 0,2945 0,3571 0,4211 0,4865 0,5533 0,6216 0,6915 0,7629 0,8360 0,9108 0,9873 70 0,1816 0,2898 0,3514 0,4144 0,4788 0,5445 0,6118 0,6805 0,7508 0,8227 0,8963 0,9716 75 0,1845 0,2853 0,3460 0,4080 0,4713
32、0,5360 0,6022 0,6699 0,7391 0,8099 0,8823 0,9565 80 0,1874 0,2809 0,3406 0,4017 0,4641 0,5278 0,5930 0,6596 0,7277 0,7974 0,8688 0,9418 85 0,1903 0,2766 0,3355 0,3956 0,4570 0,5198 0,5840 0,6496 0,7167 0,7854 0,8556 0,9275 90 0,1931 0,2725 0,3305 0,3897 0,4502 0,5121 0,5753 0,6399 0,7060 0,7737 0,84
33、29 0,9137 95 0,1960 0,2685 0,3256 0,3840 0,4436 0,5045 0,5668 0,6305 0,6957 0,7623 0,8305 0,9003 m/V is the agent mass requirement (in kilograms per cubic metre); i.e. mass, m, in kilograms of agent required per cubic metre of protected volume V to produce the indicated concentration at the temperat
34、ure specified; V is the net volume of hazard (in cubic metres); i.e. the enclosed volume minus the fixed structures impervious to extinguishant 100cVmcS=T is the temperature (in degrees Celsius); i.e. the design temperature in the hazard area; S is the specific volume (in cubic metres per kilogram);
35、 the specific volume of superheated HFC 236fa vapour at a pressure of 1,013 bar may be approximated by 12Sk kT=+ where k1= 0,141 3; k2= 0,000 6 c is the concentration (in percent); i.e. the volumetric concentration of HFC 236fa in air at the temperature indicated, and a pressure of 1,013 bar absolut
36、e. BS ISO 14520-11:20054 Table 4 HFC 236fa reference extinguishing and design concentrations Fuel Extinguishment % by volume Minimum design % by volume Class B Heptane (cup burner) Heptane (room test) 6,5 12,3 9,8 Surface Class A Wood crib PMMA PP ABS 5,0 6,8 6,8 6,8 8,8 Higher Hazard Class A a 9,3
37、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 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
38、 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 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 th
39、at 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-scale test fires are for informational purposes only. Lower and higher extinguishing concentrations than those shown for room-scale test fires may be achieve
40、d and allowed when validated by test reports from internationally recognized laboratories. aThe minimum design concentration for Higher Hazard Class A fuels shall be the higher of the Surface Class A or 95 % of the Class B minimum design concentration. Table 5 HFC 236fa extinguishing and design conc
41、entrations for other fuels Fuel Extinguishment % by volume Minimum design % by volume Acetone 6,7 9,8 Ethanol 7,8 10,1 Ethyl acetate Kerosene 6,8 6,5 9,8 9,8 Methanol Propane 8,4 7,2 10,9 9,8 Toluene 6,5 Extinguishing concentrations for all Class B fuels listed were derived in accordance with ISO 14
42、520-1: 3), Annex B. Minimum design values have been increased to the minimum design concentration established for heptane in accordancewith ISO 14520-1: 3), 7.5.1. 3) To be published. (Revision of ISO 14520-1:2000) BS ISO 14520-11:200555 Safety of personnel Any hazard to personnel created by the dis
43、charge of HFC 236fa shall be considered in the design of the system. Potential hazards can arise from the following: a) the extinguishant itself; b) the combustion products of the fire; c) breakdown products of the extinguishant resulting from exposure to fire. For minimum safety requirements, see I
44、SO 14250-1: 4), Clause 5. Toxicological information for HFC 236fa is given in Table 6. Table 6 Toxicological information for HFC 236fa Property Value % by volume ALC a 47,5 No observed adverse effect level (NOAEL) 10 Lowest observed adverse effect level (LOAEL) 15 aALC is the approximate lethal conc
45、entration for a rat population during a 4 h exposure. 6 System design 6.1 Fill density The fill density of the container shall not result in pressures exceeding the container specifications at the maximum design temperature. For examples, see Tables 7 and 8. Table 7 Storage container characteristics
46、 for HFC 236fa 25 bar Property Unit Value Maximum fill density kg/m31 200 Maximum container working pressure at 50 C bar a 34 Superpressurization at 22 C bar a 25 Reference should be made to Figure 1 for further data on pressure/temperature relationships. a1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2. 4
47、) To be published. (Revision of ISO 14520-1:2000) BS ISO 14520-11:20056 Table 8 Storage container characteristics for HFC 236fa 42 bar Property Unit Value Maximum fill density kg/m31 120 Maximum container working pressure at 50 C bar a50 Superpressurization at 22 C bar a42 Reference should be made t
48、o Figure 2 for further data on pressure/temperature relationships. a1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2. Exceeding the maximum fill density may result in the container becoming “liquid full”, with the effect that an extremely high rise in pressure occurs with small increases in temperature, whi
49、ch could adversely affect the integrity of the container assembly. The relationships between pressure and temperature are shown in Figures 1 and 2 for various levels of fill density. Values of density in kilograms per cubic metre Key X temperature, C Y pressure, bar Figure 1 Temperature/pressure graph for HFC 236fa pressurized with nitrogen to 25 bar at 22 C BS ISO 14520-11:20057Values of density in kilograms per cubic metre Key X temperature,
