1、 ISO 2016 Gaseous fire-extinguishing systems Physical properties and system design Part 8: HFC 125 extinguishant Systmes dextinction dincendie utilisant des agents gazeux Proprits physiques et conception des systmes Partie 8: Agent extincteur HCFC 125 INTERNATIONAL STANDARD ISO 14520-8 Third edition
2、 2016-10-01 Reference number ISO 14520-8:2016(E) ISO 14520-8:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by a
3、ny means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 4
4、01 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 14520-8:2016(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Characteristics and uses . 1 4.1 General . 1 4.2 Use of HFC 125 systems 2 5 Safety of pers
5、onnel . 5 6 System design 6 6.1 Fill density. 6 6.2 Superpressurization . 7 6.3 Extinguishant quantity . 7 7 Environmental properties 8 ISO 2016 All rights reserved iii Contents Page ISO 14520-8:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of na
6、tional 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 to be represented on that committee. Intern
7、ational 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. The procedures used to develop this document and those inte
8、nded for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www
9、.iso.org/directives). 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. Details of any patent rights identified during the development of the document
10、will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and exp
11、ressions related to conformit y assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html. The committee responsible for this document is ISO/TC 21, Equipment
12、for fire protection and fire fighting, Subcommittee SC 8, Gaseous media and fire fighting systems using gas. This third edition cancels and replaces the second edition (ISO 14520-8:2006), which has been technically revised with the following change: added Clause 7. A list of all parts in the ISO 145
13、20 series can be found on the ISO website.iv ISO 2016 All rights reserved INTERNATIONAL ST ANDARD ISO 14520-8:2016(E) Gaseous fire-extinguishing systems Physical properties and system design Part 8: HFC 125 extinguishant 1 Scope This document contains specific requirements for gaseous fire-extinguis
14、hing systems, with respect to the HFC 125 extinguishant. It includes details of physical properties, specification, usage and safety aspects. This document covers systems operating at nominal pressures of 25 bar and 42 bar, superpressurized with nitrogen. This does not preclude the use of other syst
15、ems. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (incl
16、uding any amendments) applies. ISO 14520-1:2015, Gaseous fire-extinguishing systems 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. ISO and IEC maintain terminological
17、 databases for use in standardization at the following addresses: IEC Electropedia: available at http:/ /www.electropedia.org/ ISO Online browsing platform: available at http:/ /www.iso.org/obp 4 Characteristics and uses 4.1 General Extinguishant HFC 125 shall comply with the specification shown in
18、Table 1. HFC 125 is a colourless, almost odourless, electrically non-conductive gas, with a density approximately four times that of air. The physical properties are shown in Table 2. HFC 125 extinguishes fires mainly by physical means, but also by some chemical means. ISO 2016 All rights reserved 1
19、 ISO 14520-8:2016(E) Table 1 Specification for HFC 125 Property Requirement Purity 99,6 % by mass, min. Acidity 3 10 4% by mass (3 parts per million), max. Water content 10 10 4% by mass (10 parts per million), max. Non-volatile residue 0,01 % by mass, max. Suspended matter or sediment None visible
20、Table 2 Physical properties of HFC 125 Property Units Value Molecular mass 120,02 Boiling point at 1,013 bar (absolute) C 48,09 Freezing point C 101 Critical temperature C 66,02 Critical pressure bar abs 36,18 Critical volume cm 3 /mol 210 Critical density kg/m 3 573,6 Vapour pressure 20 C bar abs 1
21、2,05 Liquid density 20 C kg/m 3 1 218,0 Saturated vapour density 20 C kg/m 3 77,97 Specific volume of superheated vapour at 1,013 bar and 20 C m 3 /kg 0,197 2 Chemical formula CF 3 CHF 2 Pentafluoroethane Chemical name 4.2 Use of HFC 125 systems HFC 125 total flooding systems may be used for extingu
22、ishing fires of all classes within the limits specified in ISO 14520-1:2015, Clause 4. The extinguishant requirements per volume of protected space are shown in Table 3 for various levels of concentration. These are based on methods shown in ISO 14520-1:2015, 7.6. The extinguishing concentrations an
23、d design concentrations for n-heptane and surface class A hazards are shown in Table 4. Concentrations for other fuels are shown in Table 52 ISO 2016 All rights reserved ISO 14520-8:2016(E) Table 3 HFC 125 total flooding quantity Tempera- ture T C Specific vapour volume S HFC 125 mass requirements p
24、er unit volume of protected space, m/V (kg/m 3 ) Design concentration (by volume) m 3 /kg 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 % 16 % 45 0,1497 0,5028 0,5809 0,6607 0,7422 0,8256 0,9109 0,9982 1,0874 1,1788 1,2724 40 0,1534 0,4907 0,5669 0,6447 0,7243 0,8057 0,8889 0,9741 1,0612 1,1504 1,2417 35
25、0,1572 0,4788 0,5532 0,6291 0,7068 0,7862 0,8675 0,9505 1,0356 1,1226 1,2117 30 0,1608 0,4681 0,5408 0,6151 0,6910 0,7686 0,8480 0,9293 1,0124 1,0975 1,1846 25 0,1645 0,4576 0,5286 0,6012 0,6754 0,7513 0,8290 0,9084 0,9896 1,0728 1,1579 20 0,1682 0,4475 0,5170 0,5880 0,6606 0,7348 0,8107 0,8884 0,96
26、78 1,0492 1,1324 15 0,1719 0,4379 0,5059 0,5753 0,6464 0,7190 0,7933 0,8693 0,9470 1,0266 1,1081 10 0,1755 0,4289 0,4955 0,5635 0,6331 0,7042 0,7770 0,8514 0,9276 1,0055 1,0853 5 0,1791 0,4203 0,4855 0,5522 0,6204 0,6901 0,7614 0,8343 0,9089 0,9853 1,0635 0 0,1828 0,4118 0,4757 0,5410 0,6078 0,6761
27、0,7460 0,8174 0,8905 0,9654 1,0420 5 0,1864 0,4038 0,4665 0,5306 0,5961 0,6631 0,7316 0,8016 0,8733 0,9467 1,0219 10 0,1900 0,3962 0,4577 0,5205 0,5848 0,6505 0,7177 0,7864 0,8568 0,9288 1,0025 15 0,1935 0,3890 0,4494 0,5111 0,5742 0,6387 0,7047 0,7722 0,8413 0,9120 0,9844 20 0,1971 0,3819 0,4412 0,
28、5018 0,5637 0,6271 0,6919 0,7581 0,8259 0,8953 0,9664 25 0,2007 0,3750 0,4333 0,4928 0,5536 0,6158 0,6794 0,7445 0,8111 0,8793 0,9491 30 0,2042 0,3686 0,4258 0,4843 0,5441 0,6053 0,6678 0,7318 0,7972 0,8642 0,9328 35 0,2078 0,3622 0,4185 0,4759 0,5347 0,5948 0,6562 0,7191 0,7834 0,8492 0,9166 40 0,2
29、113 0,3562 0,4115 0,4681 0,5258 0,5849 0,6454 0,7072 0,7704 0,8352 0,9014 45 0,2149 0,3503 0,4046 0,4602 0,5170 0,5751 0,6345 0,6953 0,7575 0,8212 0,8863 50 0,2184 0,3446 0,3982 0,4528 0,5088 0,5659 0,6244 0,6842 0,7454 0,8080 0,8721 55 0,2219 0,3392 0,3919 0,4457 0,5007 0,5570 0,6145 0,6734 0,7336
30、0,7953 0,8584 60 0,2254 0,3339 0,3858 0,4388 0,4930 0,5483 0,6050 0,6629 0,7222 0,7829 0,8451 65 0,2289 0,3288 0,3799 0,4321 0,4854 0,5400 0,5957 0,6528 0,7112 0,7710 0,8321 70 0,2324 0,3239 0,3742 0,4256 0,4781 0,5318 0,5868 0,6430 0,7005 0,7593 0,8196 N O T E T h i s i n f o r m a t i o n r e f e
31、r s o n l y t o t h e p r o d u c t H F C - 1 2 5 a n d d o e s n o t r e p r e s e n t a n y o t h e r p r o d u c t s c o n t a i n i n g pentafluoroethane as a component. Symbols:m/V is the agent mass requirements (kg/m 3 ); i.e. mass, m, in kilograms of agent required per cubic metre of protecte
32、d volume, V, to produce the indicated concentration at the temperature specified;V is the net volume of hazard (m 3 ); i.e. the enclosed volume minus the fixed structures impervious to extinguishant T is the temperature (C); i.e. the design temperature in the hazard area;S is the specific volume (m
33、3 /kg); the specific volume of superheated HFC 125 vapour at a pressure of 1,013 bar may be approximated by the formulaS=k 1+ k 2 Twherek 1= 0,182 5k 2= 0,000 7c is the concentration (%); i.e. the volumetric concentration of HFC 125 in air at the temperature indicated and a pressure of 1,013 bar. IS
34、O 2016 All rights reserved 3 ISO 14520-8:2016(E) Tempera- ture T C Specific vapour volume S HFC 125 mass requirements per unit volume of protected space, m/V (kg/m 3 ) Design concentration (by volume) m 3 /kg 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 % 16 % 75 0,2358 0,3192 0,3688 0,4194 0,4712 0,5242
35、 0,5783 0,6337 0,6904 0,7484 0,8078 80 0,2393 0,3145 0,3634 0,4133 0,4643 0,5165 0,5698 0,6244 0,6803 0,7374 0,7960 85 0,2428 0,3100 0,3581 0,4073 0,4576 0,5090 0,5616 0,6154 0,6705 0,7268 0,7845 90 0,2463 0,3056 0,3531 0,4015 0,4511 0,5018 0,5536 0,6067 0,6609 0,7165 0,7734 95 0,2498 0,3013 0,3481
36、0,3959 0,4448 0,4948 0,5459 0,5982 0,6517 0,7064 0,7625 N O T E T h i s i n f o r m a t i o n r e f e r s o n l y t o t h e p r o d u c t H F C - 1 2 5 a n d d o e s n o t r e p r e s e n t a n y o t h e r p r o d u c t s c o n t a i n i n g pentafluoroethane as a component. Symbols:m/V is the agent
37、 mass requirements (kg/m 3 ); i.e. mass, m, in kilograms of agent required per cubic metre of protected volume, V, to produce the indicated concentration at the temperature specified;V is the net volume of hazard (m 3 ); i.e. the enclosed volume minus the fixed structures impervious to extinguishant
38、 T is the temperature (C); i.e. the design temperature in the hazard area;S is the specific volume (m 3 /kg); the specific volume of superheated HFC 125 vapour at a pressure of 1,013 bar may be approximated by the formulaS=k 1+ k 2 Twherek 1= 0,182 5k 2= 0,000 7c is the concentration (%); i.e. the v
39、olumetric concentration of HFC 125 in air at the temperature indicated and a pressure of 1,013 bar.Table 3 (continued) 4 ISO 2016 All rights reserved ISO 14520-8:2016(E) Table 4 HFC 125 reference extinguishing and design concentrations Fuel Extinguishment % by volume Minimum design % by volume Class
40、 B Heptane (cup burner) Heptane (room test)9,3 9,312,1 Surface Class A Wood Crib PMMA PP ABS6,7 8,6 8,6 8,611,2 Higher Hazard Class A See Note 4 11,5 NOTE 1 The extinguishment values for the Class B and the Surface Class A fuels are determined by testing in accordance with ISO 14520-1: 2015, Annexes
41、 B and C. NOTE 2 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. NOTE 3 The minimum design concentration for Surface Class A fuel is the highest value of the wood crib, PMMA, PP o
42、r ABS extinguishment concentrations multiplied by 1,3. In the absence of any of the four extinguishment values, the minimum design concentration for Surface Class A is that of Higher Hazard Class A. NOTE 4 The minimum design concentration for Higher Hazard Class A fuels is the higher of the Surface
43、Class A or 95 % of the Class B minimum design concentration. NOTE 5 See ISO 14520-1: 2015, 7.5.1.3 for guidance on Class A fuels. In Table 4, the extinguishing and design concentrations for room-scale test fires are for informational purposes only. Lower and higher extinguishing concentrations than
44、those shown for room-scale test fires may be achieved and allowed when validated by test reports from internationally recognized laboratories. Table 5 HFC 125 extinguishing and design concentrations for other fuels Fuel Extinguishment % by volume Minimum design % by volume Acetone 9,3 12,1 Ethanol 1
45、1,3 14,7 Ethyl acetate 9,3 12,1 Methanol Kerosene Propane 12,3 9,3 9,7 15,9 12,1 12,6 Toluene 9,3 12,1 NOTE Extinguishing concentrations for all Class B fuels listed were derived in accordance with ISO 14520-1: 2015, Annex B. Minimum design values have been increased to the minimum design concentrat
46、ion established for heptane in accordance with ISO 14520-1: 2015, 7.5.1. 5 Safety of personnel Any hazard to personnel created by the discharge of HFC 125 shall be considered in the design of the system. Potential hazards can arise from the following: a) the extinguishant itself; ISO 2016 All rights
47、 reserved 5 ISO 14520-8:2016(E) b) the combustion products of the fire; c) breakdown products of the extinguishant resulting from exposure to fire. For minimum safety requirements, see ISO 14520-1: 2015, Clause 5. Toxicological information for HFC 125 is shown in Table 6. Table 6 Toxicological infor
48、mation for HFC 125 Property Value % by volume ALC 70 No observed adverse effect level (NOAEL) 7, 5 Lowest observed adverse effect level (LOAEL) 10 NOTE ALC is the approximate lethal concentration for a rat population during a 4-h exposure. 6 System design 6.1 Fill density The fill density of the con
49、tainer shall not exceed the values shown in Table 7 for 25 bar system and Table 8 for 42 bar system. 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, which could adversely affect the integrity of the container assembly. The relationships between pressure and temperature are shown in Figure 1 for v
