1、Designation:D623111(Reapproved 2015)Standard Specification forHFC-125(Pentafluoroethane,C2HF5)1This standard is issued under the fixed designation D6231;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the requirements for HFC-125as a fire-fighting medium.1.2 This specification does not address the fire-fightingequipm
3、ent or hardware that employs HFC-125 or the condi-tions of employing such equipment,for example,hand helds,fixed installations,etc.1.3 This specification does not address the storage ortransportation of HFC-125.Storage,handling,and transporta-tion issues are addressed in Practice D6268.1.4 The value
4、s stated in both inch-pound and SI units are tobe regarded separately as the standard.The values given inparentheses are for information only.1.5 The following safety hazards caveat pertains to the testmethods portion,Section 6,of this specification.This standarddoes not purport to address all of th
5、e safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.Specific hazards statements are given in 4.3.2.Referenced Documents2.1 ASTM
6、Standards:2D6268 Practice for Handling,Transportation,and Storage ofHFC-125,Pentafluoroethane(C2HF5)D6806 Practice for Analysis of Halogenated Organic Sol-vents and Their Admixtures by Gas Chromatography2.2 ISO Standards:3ISO 3427 Gaseous Halogenated Hydrocarbons(LiquefiedGases)Taking a Sample2.3 AH
7、RI Standards:42008 Appendix C Analytical Procedures for ARI Standard700-20062.4 U.S.Government Standards:5Code of Federal Regulations(CFR)Title 49,Part 172.101,Tables of Hazardous Materials and Special ProvisionsCode of Federal Regulations(CFR)Title 49,Part 172Subpart D,Marking Requirements of Packa
8、ging forTransportation2.5 American Society of Refrigerating Engineers:6ASRE Standard 34,Designation of Refrigerants3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 halogenated hydrocarbon,nthe halogenated com-pound coding terminology system provides a convenientmeans to referenc
9、e halogenated hydrocarbons(see ASRE 34).Halogenated hydrocarbons are saturated hydrocarbons inwhich one or more of the hydrogen atoms have been replacedby atoms of the halogen series:fluorine,chlorine,bromine,andiodine.It is convention to prefix the number with an abbrevia-tion of the compound:CFC=c
10、hlorofluorocarbonHCFC=hydrochlorofluorocarbonHFC=hydrofluorocarbonFC=fluorocarbonR=refrigerant3.1.1.1 DiscussionBy definition,the rightmost digit ofthe numbering system is the number of fluorine atoms.Thesecond digit from the right is the number of hydrogen atomsplus one(+1).The third digit from the
11、 right is one less(-1)thannumber of carbon atoms in the compound(when this numberis zero(0)it is omitted from the number).Unaccounted forvalance requirements are assumed to be chlorine atoms.Whenthe compound contains bromine or iodine,the same rules applyexcept the letter“B”for bromine or“I”for iodi
12、ne follows the1This specification is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agentsand is the directresponsibility of Subcommittee D26.09 on Fire Extinguishing Agents.Current edition approved June 1,2015.Published June 2015.Originallyapprove
13、d in 1998.Last previous edition approved in 2011 as D6231-11.DOI:10.1520/D6231-11R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page
14、onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from the Air Conditioning,Heating and Refrigeration Institute(AHRI),2111 Wilson Blvd.,Suite 500,Arlington,VA,22201,http:/www.ahrinet.org.5Available f
15、rom U.S.Government Publishing Office,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.gpo.gov.6Available from American Society of Refrigeration Engineers,RefrigerationEngineering 65,49(1957).Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United
16、States1 parent compound designated number and the number of theatoms is placed after the letter.Example:C2HF55 R 2 1255 HFC2 125(1)3.1.2 HFC-125,nthe compound pentafluoroethane;C2HF5.4.Material Requirements4.1 Type I:4.1.1 The nitrogen(N2)partial pressure shall be such thatthe safe working pressure of the receiving vessel is notexceeded.To prevent excessive pressure,the fill density of theHFC-125/nitrogen within the container should not exceed thatneeded to achieve complete filling of the contai
