ISO-14520-8-2006.pdf

international standard iso 14520-8 second edition 2006-02-15 reference number iso 14520-8:2006(e) iso 2006 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 iso 14520-8:2006(e) ii iso 2006 all rights reserved pdf disclaimer this pdf file may contain embedded typefaces. in accordance with adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. in downloading this file, parties accept therein the responsibility of not infringing adobes licensing policy. the iso central secretariat accepts no liability in this area. adobe is a trademark of adobe systems incorporated. details of the software products used to create this pdf file can be found in the general info relative to the file; the pdf-creation parameters were optimized for printing. every care has been taken to ensure that the file is suitable for use by iso member bodies. in the unlikely event that a problem relating to it is found, please inform the central secretariat at the address given below. iso 2006 all rights reserved. unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either iso at the address below or isos member body in the country of the requester. iso copyright office case postale 56 ch-1211 geneva 20 tel. + 41 22 749 01 11 fax + 41 22 749 09 47 e-mail web published in switzerland -,-,- iso 14520-8:2006(e) iso 2006 all rights reserved iii foreword iso (the international organization for standardization) 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 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 standards 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 international 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 14520-8 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 14520-8:2000), 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: 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: 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 124 extinguishants, respectively, have been withdrawn, as these types are no longer manufactured. 3 -,-,- . iv international standardiso 14520-8:2006(e) iso 2006 all rights reserved 1 gaseous fire-extinguishing systems physical properties and system design part 8: hfc 125 extinguishant 1scope this part of iso 14520 gives specific requirements for gaseous fire-extinguishing systems, with respect to the hfc 125 extinguishant. it includes details of physical properties, specification, usage and safety aspects and is applicable to systems operating at nominal pressures of and , superpressurized with nitrogen. this does not preclude the use of other systems. 2normative references 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 systems physical properties and system design part 1: general requirements 3terms and definitions for the purposes of this document, the terms and definitions given in iso 14520-1 apply. 4characteristics and uses 4.1general extinguishant 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 approximately four times 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 bar42 bar -,-,- iso 14520-8:2006(e) 2 iso 2006 all rights reserved 4.2use of hfc 125 systems hfc 125 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 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 those for other fuels in table 5. table 1 specification for hfc 125 propertyrequirement purity 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 sedimentnone visible table 2 physical properties of hfc 125 propertyunitvalue molecular mass120,02 boiling point at 1,013 bar (absolute) a freezing point critical temperature66,02 critical pressurebar abs a36,18 critical volumecm3/mol210 critical densitykg/m3573,6 vapour pressure bar abs a12,05 liquid density kg/m31 218,0 saturated vapour density kg/m377,97 specific volume of superheated vapour at 1,013 bar and m3/kg0,1972 chemical formulacf3chf2 chemical namepentafluoroethane a ; . 99,6 % 3104% 10104% 0,01 % c 48,09 c 101 c 20 c 20 c 20 c 20 c 1 bar=0,1 mpa=105pa 1 mpa=1 n/mm2 iso 14520-8:2006(e) iso 2006 all rights reserved 3 table 3 hfc 125 total flooding quantity temperature 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/kg 0,14970,50280,58090,66070,74220,82560,91090,99821,08741,17881,2724 0,15340,49070,56690,64470,72430,80570,88890,97411,06121,15041,2417 0,15720,47880,55320,62910,70680,78620,86750,95051,03561,12261,2117 0,16080,46810,54080,61510,69100,76860,84800,92931,01241,09751,1846 0,16450,45760,52860,60120,67540,75130,82900,90840,98961,07281,1579 0,16820,44750,51700,58800,66060,73480,81070,88840,96781,04921,1324 0,17190,43790,50590,57530,64640,71900,79330,86930,94701,02661,1081 0,17550,42890,49550,56350,63310,70420,77700,85140,92761,00551,0853 0,17910,42030,48550,55220,62040,69010,76140,83430,90890,98531,0635 00,18280,41180,47570,54100,60780,67610,74600,81740,89050,96541,0420 50,18640,40380,46650,53060,59610,66310,73160,80160,87330,94671,0219 100,19000,39620,45770,52050,58480,65050,71770,78640,85680,92881,0025 150,19350,38900,44940,51110,57420,63870,70470,77220,84130,91200,9844 200,19710,38190,44120,50180,56370,62710,69190,75810,82590,89530,9664 250,20070,37500,43330,49280,55360,61580,67940,74450,81110,87930,9491 300,20420,36860,42580,48430,54410,60530,66780,73180,79720,86420,9328 350,20780,36220,41850,47590,53470,59480,65620,71910,78340,84920,9166 400,21130,35620,41150,46810,52580,58490,64540,70720,77040,83520,9014 450,21490,35030,40460,46020,51700,57510,63450,69530,75750,82120,8863 500,21840,34460,39820,45280,50880,56590,62440,68420,74540,80800,8721 550,22190,33920,39190,44570,50070,55700,61450,67340,73360,79530,8584 600,22540,33390,38580,43880,49300,54830,60500,66290,72220,78290,8451 650,22890,32880,37990,43210,48540,54000,59570,65280,71120,77100,8321 700,23240,32390,37420,42560,47810,53180,58680,64300,70050,75930,8196 750,23580,31920,36880,41940,47120,52420,57830,63370,69040,74840,8078 800,23930,31450,36340,41330,46430,51650,56980,62440,68030,73740,7960 850,24280,31000,35810,40730,45760,50900,56160,61540,67050,72680,7845 900,24630,30560,35310,40150,45110,50180,55360,60670,66090,71650,7734 950,24980,30130,34810,39590,44480,49480,54590,59820,65170,70640,7625 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 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 hfc 125 vapour at a pressure of 1,013 bar may be approximated by where ; 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. t s m/v c 7 %8 %9 %10 %11 %12 %13 %14 %15 %16 % 45 40 35 30 25 20 15 10 5 m/vm v v m = ? c 100 c ? v s t s s = k1+ k2t k1=0,182 5k2=0,000 7 c -,-,- iso 14520-8:2006(e) 4 iso 2006 all rights reserved table 4 hfc 125 reference extinguishing and design concentrations fuelextinguishmentminimum design by volume by volume class b heptane (cup burner)9,312,1 heptane (room test)9,3 surface class a wood crib6,7 pmma8,611,2 pp8,6 abs8,6 higher hazard class a a 11,5 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 higher value of the heptane cup burner or room test heptane extinguishment concentration 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 that of higher hazard class a. see iso 14520-1:2006, , 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 achieved and allowed when validated by test reports from internationally recognized laboratories. a the minimum design concentration for higher hazard class a fuels shall be the higher of the surface class a or of the class b minimum design concentration. table 5 hfc 125 extinquishing and design concentrations for other fuels fuelinertionminimum design by volume by volume acetone9,312,1 ethanol11,314,7 ethyl acetate9,312,1 methanol12,315,9 kerosene9,312,1 propane9,712,6 toluene9,312,1 extinguishing concentrations for class b fuels derived in accordance with iso 14520-1:2006, annex b. minimum design values have been increased to the minimum design concentration established for heptane in accordance with iso 14520-1:2006, 7.5.1. % 95 % % -,-,- iso 14520-8:2006(e) iso 2006 all rights reserved 5 5safety 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; b)the combustion products of the fire; c)breakdown products of the extinguishant resulting from exposure to fire. for minimum safety requirements, see iso 14520-1:2006, clause 5. toxicological information for hfc 125 is given in table 6. 6system design 6.1fill density the fill density of the container shall not exceed the values given in tables 7 and 8 for and systems, respectively. 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 figures 1 and 2 for various levels of fill density. table 6 toxicological information for hfc 125 propertyvalue by volume alc no observed adverse effect level (noael)7,5 lowest observed adverse effect level (loael)10 alc is the approximate lethal concentration for a rat population during a exposure. table 7 storage container characteristics for hfc 125 25 bar propertyunitvalue maximum fill densitykg/m3929 maximum container working pressure at bar a40 superpressurization at bar a25 reference should be made to figure 1 for further data on pressure/temperature relationships. a ; . table 8 storage container characteristics for hfc 125 42 bar propertyunitvalue maximum fill densitykg/m3929 maximum container working pressure at bar a63 superpressurization at bar a42 reference should be made to figure 2 for