1、BRITISH STANDARD BS ISO 14520-2:2006 Gaseous fire-extinguishing systems Physical properties and system design Part 2: CF 3 I extinguishant ICS 13.220.10 BS ISO 14520-2:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2006 BSI 2006
2、ISBN 0 580 48315 0 National foreword This British Standard reproduces verbatim ISO 14520-2:2006 and implements it as the UK national standard. It supersedes BS ISO 14520-2:2000 which is The UK participation in its preparation was entrusted by Technical Committee FSH/18, Fixed firefighting equipment,
3、 to Subcommittee FSH/18/6, Gaseous extinguishing media and systems, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor
4、 related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be
5、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 provisions of a contract. Users are r
6、esponsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 6, an inside back cover
7、and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments withdrawn.INTERNATIONAL STANDARD ISO 14520-2 Second edition 2006-02-15 Reference number ISO 14520-2:2006(E) Gaseous fire-extin
8、guishing systems Physical properties and system design Part 2: CF 3 I extinguishant Systmes dextinction dincendie utilisant des agents gazeux Proprits physiques et conception des systmes Partie 2: Agent extincteur CF 3 IBS ISO 14520-2:2006ii iii Foreword ISO (the International Organization for Stand
9、ardization) is a worldwide federation of national standards bodies (ISO 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
10、to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International St
11、andards are drafted in 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 Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an I
12、nternational Standard requires 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 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 145
13、20-2 was prepared by Technical 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 14520-2:2000), which has been technically revised. It incorporates
14、 ISO 14520-2:2000/Cor.1:2001. ISO 14520 consists of the following parts, under 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
15、: 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 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
16、 124 extinguishants, respectively, have been withdrawn, as these types are no longer manufactured. 3 BS ISO 14520-2:2006. blank1 Gaseous fire-extinguishing systems Physical properties and system design Part 2: CF 3 I extinguishant 1S c o p e This part of ISO 14520 gives specific requirements for gas
17、eous fire-extinguishing systems, with respect to the CF 3 I extinguishant. It includes details of physical properties, specification, usage and safety aspects and is applicable to systems operating at a nominal pressure of 25 bar. This does not preclude the use of other systems. 2 Normative referenc
18、es The following referenced documents are indispensable 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 14520-1:2006, Gaseous fire-extinguishing s
19、ystems Physical properties and system design Part 1: General requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 14520-1 apply. 4C h a r a c t e r i s t i cs and uses 4.1 General Extinguishant CF 3 I shall comply with the specification accor
20、ding to Table 1. CF 3 I is a colourless, almost odourless, electrically non-conductive gas with a density approximately seven times that of air. The physical properties are given in Table 2. CF 3 I extinguishes fires mainly by chemical means, but also by some physical means. BS ISO 14520-2:20062 4.2
21、 Use of CF 3 I systems CF 3 I total flooding systems may be used for extinguishing fires of all classes within the limits specified in ISO 14520-1:2006, Clause 4. The extinguishant requirements per volume of protected space are given in Table 3 for various levels of concentration. These are based on
22、 methods given in ISO 14520-1:2006, 7.6. The extinguishing concentrations and design concentrations for n-heptane and Surface class A hazards are given in Table 4, and inerting concentrations in Table 5. Table 1 Specification for CF 3 I Property Requirement Purity by mass, min. Acidity by mass, max.
23、 Water content by mass, max. Non-volatile residue by mass, max. Suspended matter or sediment None visible Table 2 Physical properties of CF 3 I Property Unit Value Molecular mass 195,9 Boiling point at 1,013 bar (absolute) a Freezing point Critical temperature 122 Critical pressure bar abs a 40,4 Cr
24、itical volume cm 3 /mol 225,0 Critical density kg/m 3 871 Vapour pressure bar abs a 4,65 Liquid density kg/m 3 2 096 Saturated vapour density kg/m 3 8,051 Specific volume of superheated vapour at 1,013 bar and m 3 /kg 0,124 Chemical formula Chemical name Trifluoroiodomethane a ; 99,9 % 1 10 6 6 10 6
25、 100 10 6 C 22,5 C 110 C 20 C 20 C 20 C 20 C CF 3 I 1 bar = 0,1 MPa = 10 5 Pa 1 MPa = 1 N/mm 2 . BS ISO 14520-2:2006BS ISO 14520-2:2006 3 Table 3 CF 3 I total flooding quantity Temperature Specific vapour volume CF 3 I mass requirements per unit volume of protected space, (kg/m 3 ) This information
26、refers only to CF 3 I, and may not represent any other products containing Trifluoroiodomethane as a component Design concentration (by volume) m 3 /kg 0,1013 0,3053 0,4113 0,5196 0,6301 0,7430 0,8584 0,9763 1,0969 0,1038 0,2980 0,4014 0,5070 0,6149 0,7251 0,8377 0,9528 1,0704 0,1063 0,2909 0,3920 0
27、,4851 0,6005 0,7081 0,8180 0,9304 1,0453 0,1088 0,2843 0,3830 0,4837 0,5867 0,6918 0,7992 0,9090 1,0212 0,1113 0,2779 0,3744 0,4729 0,5735 0,6763 0,7813 0,8886 0,9983 0 0,1138 0,2718 0,3661 0,4625 0,5609 0,6614 0,7641 0,8691 0,9764 5 0,1163 0,2659 0,3583 0,4526 0,5488 0,6472 0,7477 0,8504 0,9554 10
28、0,1188 0,2603 0,3507 0,4430 0,5373 0,6336 0,7320 0,8325 0,9353 15 0,1213 0,2550 0,3436 0,4339 0,5262 0,6205 0,7169 0,8153 0,9160 20 0,1238 0,2498 0,3366 0,4251 0,5156 0,6080 0,7024 0,7989 0,8975 25 0,1263 0,2449 0,3299 0,4167 0,5054 0,5960 0,6885 0,7831 0,8797 30 0,1288 0,2401 0,3235 0,4086 0,4956 0
29、,5844 0,6751 0,7679 0,8627 35 0,1313 0,2356 0,3173 0,4008 0,4861 0,5733 0,6623 0,7532 0,8462 40 0,1338 0,2311 0,3114 0,3934 0,4771 0,5625 0,6499 0,7392 0,8304 45 0,1363 0,2269 0,3057 0,3861 0,4683 0,5522 0,6380 0,7256 0,8152 50 0,1388 0,2228 0,3002 0,3792 0,4599 0,5423 0,6265 0,7125 0,8005 55 0,1413
30、 0,2189 0,2949 0,3725 0,4517 0,5327 0,6154 0,6999 0,7863 60 0,1438 0,2151 0,2898 0,3660 0,4439 0,5234 0,6047 0,6878 0,7727 65 0,1463 0,2114 0,2848 0,3598 0,4363 0,5145 0,5944 0,6760 0,7595 70 0,1488 0,2078 0,2800 0,3537 0,4290 0,5058 0,5844 0,6647 0,7467 75 0,1513 0,2044 0,2754 0,3479 0,4219 0,4975
31、0,5747 0,6537 0,7344 80 0,1538 0,2011 0,2709 0,3422 0,4150 0,4894 0,5654 0,6431 0,7224 85 0,1563 0,1979 0,2666 0,3367 0,4084 0,4816 0,5563 0,6328 0,7109 90 0,1588 0,1948 0,2624 0,3314 0,4020 0,4740 0,5476 0,6228 0,6997 95 0,1613 0,1917 0,2583 0,3263 0,3957 0,4666 0,5391 0,6132 0,6888 100 0,1638 0,18
32、88 0,2544 0,3213 0,3897 0,4595 0,5309 0,6038 0,6783 is the agent mass requirement (in kilograms per cubic metre); i.e. mass, , in kilograms of agent required per cubic metre of protected volume to produce the indicated concentration at the temperature specified; is the net volume of hazard (in cubic
33、 metres); i.e. the enclosed volume minus the fixed structures impervious to extinguishant is the temperature (in degrees Celsius); i.e. the design temperature in the hazard area; is the specific volume (in cubic metres per kilogram); the specific volume of superheated CF 3 I vapour at a pressure of
34、1,013 bar may be approximated by where ; is the concentration (in percent); i.e. the volumetric concentration of CF 3 I in air at the temperature indicated, and a pressure of 1,013 bar absolute. T S m/V C 3% 4% 5% 6% 7% 8% 9% 10 % 25 20 15 10 5 m/V m V V m = c 100 c V S T S S = k 1 + k 2 T k 1 = 0,1
35、13 8 k 2 = 0,000 5 cBS ISO 14520-2:2006 4 5 Safety of personnel Any hazard to personnel created by the discharge of CF 3 I 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) breakdow
36、n products of the extinguishant resulting from exposure to fire. For minimum safety requirements, see ISO 14520-1:2006, Clause 5. Table 4 CF 3 I reference extinguishing and design concentrations Fuel Extinguishment Minimum designby volume by volume Class B Heptane (cup burner) 3,5 4,6 Heptane (room
37、test) 3,5 Surface Class A Wood crib 3,5 PMMA a PP ABS Higher Hazard Class A b 9,3 The extinguishment values for the Class B and the Surface Class A fuels are determined by testing in accordance with ISO 14520-1:2006, Annexes B and C. The minimum design concentration for the Class B fuel is the highe
38、r value of the heptane cup burner or room test heptane extinguishment concentration multiplied by 1,3. See ISO 14520-1:2006, 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 higher extinguishi
39、ng concentrations than those shown for room-scale test fires may be achieved and allowed when validated by test reports from internationally recognized laboratories. a The minimum design concentration for Surface Class A fuel is the highest value of the wood crib, PMMA, PP or ABS extinguishment conc
40、entrations 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. b The minimum design concentration for Higher Hazard Class A fuels shall be the higher of the surface Class A or of the Cla
41、ss B minimum design concentration. Table 5 CF 3 I inerting and design concentrations Fuel Extinguishment Minimum designby volume by volume Propane 6,5 7,2 Inerting concentrations determined in accordance with ISO 14520-1:2006, 7.5.2 and Annex D. % % 95 % % %5 Toxicological information for CF 3 I is
42、given in Table 6. Since the design concentrations exceed the LOAEL under normal design conditions, CF 3 I shall only be used for total flooding in normally unoccupied areas. 6 System design 6.1 Fill density The fill density of the container shall not exceed the values given in Table 7. Exceeding the
43、 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, which could adversely affect the integrity of the container assembly. The relationships between pressure and temperature are s
44、hown in Figure 1 for various levels of fill density. Table 6 Toxicological information for CF 3 I Property Value % by volume LC 50 27,4 ALC No observed adverse effect level (NOAEL) 0,2 Lowest observed adverse effect level (LOAEL) 0,4 LC 50 is the concentration lethal to of a rat population during a
45、exposure. ALC is the approximate lethal concentration for a rat population during a exposure. Table 7 Storage container characteristics for CF 3 I Property Unit Value Maximum fill density kg/m 3 168 0 Maximum container working pressure at bar a 35,5 Superpressurization at bar a 25 Reference should b
46、e made to Figure1 for further data on pressure/temperature relationships. a ; 12,8 50 % 15 min 4h 50 C 20 C 1 bar = 0,1 MPa = 10 5 Pa 1 MPa = 1 N/mm 2 . BS ISO 14520-2:20066 6.2 Superpressurization Containers shall be superpressurized with nitrogen with a moisture content of not more than by mass to
47、 an equilibrium pressure of bar at a temperature of (see Clause 1 for exception). 6.3 Extinguishant quantity The quantity of extinguishant shall be the minimum required to achieve the design concentration within the hazard volume at the minimum expected temperature, determined using Table 3 and the
48、method according to ISO 14520-1:2006, 7.6. The design concentrations shall be those specified for relevant hazards in Table 4, including a 1,3 safety factor on the extinguishing concentration. Consideration should be given to increasing this factor for particular hazards, while seeking advice from t
49、he relevant authority. Values of density in kilograms per cubic metre Key temperature, pressure, bar Figure 1 Temperature/pressure graph for CF 3 I Superpressurized with nitrogen to 25 bar at X C Y 20 C 60 10 6 25 +1,25 0 20 C BS ISO 14520-2:2006blankBS ISO 14520-2:2006 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is
