1、 ISO 2016 Gaseous fire-extinguishing systems Physical properties and system design Part 6: HCFC Blend A extinguishant Systmes dextinction dincendie utilisant des agents gazeux Proprits physiques et conception des systmes Partie 6: Agent extincteur HCFC, mlange A INTERNATIONAL STANDARD ISO 14520-6 Th
2、ird edition 2016-10-01 Reference number ISO 14520-6:2016(E) ISO 14520-6:2016(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 f
3、orm or by any 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 Blando
4、nnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 14520-6:2016(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 HCFC Blend A systems .
5、2 5 Safety of personnel . 3 6 System design 3 6.1 Fill density. 3 6.2 Superpressurization . 3 6.3 Extinguishant quantity . 3 7 Environmental properties 8 ISO 2016 All rights reserved iii Contents Page ISO 14520-6:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwid
6、e 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 to be represented on that
7、 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. The procedures used to develop this docum
8、ent and those intended 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 Directive
9、s, Part 2 (see www.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 developmen
10、t of the document 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 spec
11、ific terms and expressions 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
12、/TC 21, Equipment for fire protection and fire fighting, Subcommittee SC 8, Gaseous media and firefighting systems using gas. This third edition cancels and replaces the second edition (ISO 14520-6:2006), which has been technically revised with the following changes: changed the superpressurization
13、value from 42 bar to 40 bar in Table 9 and Figure 2; added Clause 7. A list of all parts in the ISO 14520 series can be found on the ISO website.iv ISO 2016 All rights reserved INTERNATIONAL ST ANDARD ISO 14520-6:2016(E) Gaseous fire-extinguishing systems Physical properties and system design Part 6
14、: HCFC Blend A extinguishant 1 Scope This document contains specific requirements for gaseous fire-extinguishing systems, with respect to the HCFC Blend A extinguishant. It includes details of physical properties, specification, usage and safety aspects. This document covers systems operating at nom
15、inal pressures of 25 bar or 40 bar, superpressurized with nitrogen. This does not preclude the use of other systems. 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 referen
16、ces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 14520-1, Gaseous fire-extinguishing systems Physical properties and system design Part 1: General requirements 3 Terms and definitions For the purposes o
17、f this document, the terms and definitions given in ISO 14520-1 apply. ISO and IEC maintain terminological 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
18、4 Characteristics and uses 4.1 General Extinguishant HCFC Blend A shall comply with the specification shown in Table 1 and its components with the tolerances specified in Table 2. HCFC Blend A is a colourless, electrically non-conductive gas with a citrus-like odour and a density approximately three
19、 times that of air. The physical properties are shown in Table 3. HCFC Blend A extinguishes fires mainly by physical means but also by some chemical means. ISO 2016 All rights reserved 1 ISO 14520-6:2016(E) Table 1 Specification for HCFC Blend A Property Requirement Purity 99,6 % by mass, min. Acidi
20、ty 3 10 4% by mass (3 parts per mil- lion), 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 Table 2 HCFC Blend A component specification Component Tolerance (by mass) CHCl 2 CF 3 0,5 % CHClF 2 0,8 %
21、CHClFCF 3 0,9 % C 10 H 16 0,5 % Table 3 Physical properties of HCFC Blend A Property Units Value Molecular mass 92,9 Boiling point at 1,013 bar (absolute) C 38,3 Freezing point C 107, 2 Critical temperature C 125 Critical pressure bar abs 66,50 Critical volume cm 3 /mol 170 Critical density kg/m 3 5
22、80 Vapour pressure 20 C bar abs 8,25 Liquid density 20 C kg/m 3 1 200 Saturated vapour density 20 C kg/m 3 31 Specific volume of superheated vapour at 1,013 bar and 20 C m 3 /kg 0,259 Chemical formulae Component Percentage CHCl 2 CF 3 CHClF 2 CHClFCF 3 C 10 H 16 4,75 % 82 % 9,5 % 3,75 % 4.2 Use of H
23、CFC Blend A systems HCFC Blend A total flooding systems may be used for extinguishing 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 4 for various levels of concentration. These are based
24、 on methods shown in ISO 14520-1:2015, 7.6. The extinguishing concentrations and design concentrations for heptane and Surface Class A hazards are shown in Table 5. Inerting concentrations are shown in Table 6.2 ISO 2016 All rights reserved ISO 14520-6:2016(E) 5 Safety of personnel Any hazard to per
25、sonnel created by the discharge of HCFC Blend A 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) the breakdown products of the extinguishant resulting from exposure to fire. When t
26、he design concentration exceeds the LOAEL, HCFC Blend A shall be used only for total flooding in normally unoccupied areas. For minimum safety requirements, see ISO 14520-1:2015, Clause 5. Toxicological information for HCFC Blend A is shown in Table 7. 6 System design 6.1 Fill density The fill densi
27、ty of the container shall not exceed the values given in Table 8 for 25 bar systems and Table 9 for 40 bar systems. 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 temperatur
28、e, which could adversely affect the integrity of the container assembly. The relationships between pressure and temperature are shown in Figures 1 and 2 for maximum fill density. 6.2 Superpressurization Containers shall be superpressurized with nitrogen with a moisture content of not more than 60 10
29、 4(60 parts per million) by mass to an equilibrium pressure of (25 1,25) bar and (40 1,25) bar at a temperature of 20 C. 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 tempera
30、ture, determined using Table 4 and the method specified in ISO 14520-1:2015, 7.6. The design concentrations shall be that specified for relevant hazards shown in Table 5. This includes at least a 1,3 safety factor on the extinguishing concentration. Consideration should be given to increasing this f
31、or particular hazards and seeking advice from the relevant authority. ISO 2016 All rights reserved 3 ISO 14520-6:2016(E) Table 4 HCFC Blend A total flooding quantity Tempera- ture Specific vapour volume HCFC Blend A mass requirements per unit volume of protected space, m/V (kg/m 3 ) T S Design conce
32、ntration (by volume) C m 3 /kg 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 % 16 % 35 30 25 20 15 0,210 0,215 0,219 0,224 0,228 0,358 0,351 0,343 0,337 0,330 0,413 0,405 0,397 0,389 0,381 0,470 0,461 0,451 0,442 0,434 0,528 0,517 0,507 0,497 0,487 0,588 0,576 0,564 0,553 0,542 0,648 0,635 0,622 0,610 0,5
33、98 0,710 696 682 668 0,655 0,774 0,758 0,743 0,728 0,714 0,839 0,822 0,805 0,790 0,774 0,906 0,887 0,869 0,852 0,835 10 5 0 5 10 0,232 0,237 0,241 0,246 0,250 0,324 0,318 0,312 0,306 0,301 0,374 0,367 0,360 0,354 0,348 0,426 0,418 0,410 0,403 0,396 0,478 0,469 0,461 0,452 0,444 0,532 0,522 0,512 0,5
34、03 0,494 0,587 0,576 0,565 0,555 0,545 0,643 0,631 0,619 0,608 0,598 0,700 0,687 0,675 0,663 0,651 0,760 0,745 0,731 0,718 0,706 0,819 0,804 0,789 0,775 0,762 15 20 25 30 35 0,254 0,259 0,263 0,268 0,272 0,296 0,291 0,286 0,281 0,277 0,342 0,336 0,330 0,325 0,320 0,389 0,382 0,376 0,369 0,363 0,437
35、0,429 0,422 0,415 0,408 0,486 0,477 0,469 0,462 0,454 0,536 0,527 0,518 0,509 0,501 0,587 0,577 0,568 0,558 0,549 0,640 0,629 0,618 0,608 0,598 0,693 0,682 0,670 0,659 0,648 0,748 0,736 0,723 0,711 0,700 40 45 50 55 60 0,277 0,281 0,285 0,290 0,294 0,272 0,268 0,264 0,260 0,256 0,314 0,310 0,305 0,3
36、00 0,296 0,358 0,352 0,347 0,341 0,336 0,402 0,395 0,389 0,383 0,378 0,447 0,440 0,433 0,427 0,420 0,493 0,485 0,478 0,471 0,463 0,540 0,532 0,524 0,516 0,508 0,589 0,579 0,570 0,562 0,553 0,638 0,628 0,618 0,609 0,600 0,689 0,678 0,667 0,657 0,6474 ISO 2016 All rights reserved ISO 14520-6:2016(E) T
37、empera- ture Specific vapour volume HCFC Blend A mass requirements per unit volume of protected space, m/V (kg/m 3 ) T S Design concentration (by volume) C m 3 /kg 7 % 8 % 9 % 10 % 11 % 12 % 13 % 14 % 15 % 16 % 65 70 75 80 85 90 95 0,299 0,303 0,307 0,312 0,317 0,321 0,325 0,252 0,248 0,245 0,241 0,
38、238 0,235 0,232 0,291 0,287 0,283 0,279 0,275 0,271 0,267 0,331 0,326 0,322 0,317 0,313 0,308 0,304 0,372 0,367 0,361 0,356 0,351 0,346 0,342 0,414 0,408 0,402 0,396 0,391 0,385 0,380 0,457 0,450 0,444 0,437 0,432 0,425 0,419 0,500 0,593 0,486 0,479 0,472 0,466 0,460 0,545 0,537 0,529 0,522 0,515 0,
39、508 0,501 0,591 0,582 0,573 0,566 0,558 0,550 0,543 0,638 0,628 0,620 0,611 0,602 0,594 0,586 NOTE This information refers only to the product HCFC Blend A and does not represent any other products containing dichlorotrifluoroethane, chlorodifluoromethane, chlorotetrafluoroethane or isopropenyl-1-me
40、thyl- cyclohexane as components. Symbols:m/V is the agent 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 volum
41、e 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 3 /kg); the specific volume of superheated HCFC Blend A vapour at a pressure of 1,013 bar may be approximated by the formulaS = k 1+ k 2 Twher
42、ek 1= 0,241 3k 2= 0,000 88c is the concentration (%), i.e. the volumetric concentration of HCFC Blend A in air at the temperature indicated and a pressure of 1,013 bar absolute.Table 4 (continued) ISO 2016 All rights reserved 5 ISO 14520-6:2016(E) Table 5 HCFC Blend A reference extinguishing and des
43、ign concentrations Fuel Extinguishment % by volume Minimum design % by volume Class B Heptane (cup burner) 10,0 13,0 Heptane (room test) 9,9 Surface Class A Wood Crib 6,0 PMMA See Note 3 PP ABS Higher Hazard Class A See Note 4 12,4 NOTE 1 The extinguishment values for the Class B and the Surface Cla
44、ss A fuels are determined by testing in accordance with ISO 14520-1:2015, Annexes 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 concent
45、ration 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 four extinguishment values, the minimum design concentration for Surface Class A is that of Higher Hazard Class A. NOTE 4 The minimum d
46、esign concentration for Higher Hazard Class A fuels is the higher of the Surface 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 5, the extinguishing and design concentrations for room-scale test fires are for
47、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. Table 6 HCFC Blend A inerting and design concentrations Fuel Inertion % by vo
48、lume Minimum design % by volume Methane 18,6 20,5 Propane 18,3 20,1 1,1-Difluoroethane (HFC-152a) 13,6 15,0 Difluoromethane (HFC-32) 8,6 9,5 Isobutane 18,4 20,2 NOTE Inerting concentrations were derived in accordance with the requirements of ISO 14520-1:2015, 7.5.2 and Annex D. Table 7 Toxicological
49、 information for HCFC Blend A Property Value % by volume 4 h LC 50 64 No observed adverse effect level (NOAEL) 10 Lowest observed adverse effect level (LOAEL) 10 NOTE 4 h LC 50is the approximate concentration lethal to 50 % of a rat population during a 4 h exposure.6 ISO 2016 All rights reserved ISO 14520-6:2016(E) Table 8 25 bar storage container characteristics for HCFC Blend A Property Unit Value Maximum fill density k
