1、Designation: D7327 17Standard Specification forHFC Blend B (CH2FCF3, CHF2CF3, and CO2)1This standard is issued under the fixed designation D7327; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number i
2、n 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 requirements for HFC Blend Bas a fire-fighting medium.1.2 This specification does not address the fire-fightingequipm
3、ent or hardware that employs HFC Blend B or theconditions of employing such equipment (for example,handhelds, fixed installations, etc.).1.3 This specification does not address the storage ortransportation of HFC Blend B. Storage, handling, and trans-portation issues are addressed in Practice D7326.
4、1.4 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard1.5 This standard does not purport to address all of thesafety concerns, if any, assoc
5、iated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Specific cautionarystatements are given in Section 4.2. Referenced Documents2.1 ASTM Standards:2D732
6、6 Practice for Handling, Transportation, and Storage ofHFC Blend B (CH2FCF3, CHF2CF3, and CO2)D6806 Practice for Analysis of Halogenated Organic Sol-vents and Their Admixtures by Gas Chromatography2.2 ISO Standard:3ISO 3427 Gaseous Halogenated Hydrocarbons (LiquefiedGases)Taking of a Sample2.3 ASHRA
7、E Standard:4ASHRAE 34 Designation and Safety Classification of Re-frigerants2.4 U.S. Government Standards:5CFR Title 49, Part 172, Subpart D, U.S. Department ofTransportation (DOT), Marking Requirements of Packag-ing for TransportationCFR Title 49, Part 172.101 Tables of Hazardous Materialsand Speci
8、al Provisions2.5 AHRI Standard:62008 Appendix C for Analytical Procedures for AHRI Stan-dard 700-20143. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 HFChydrofluorocarbon; a chemical compound inwhich the compound molecule is comprised exclusively ofhydrogen, chlorine, fluorine
9、and carbon atoms.3.1.2 HFC Blend Btertiary blend comprised of HFC-134a(1,1,1,2-tetrafluoroethane), HFC-125 (pentafluoroethane), andcarbon dioxide (CO2); a compound used to inert, extinguish, orsuppress a fire or explosion hazard.3.1.2.1 DiscussionThe terminology system for fluorine-containing compou
10、nds (described in detail in ASHRAE Stan-dard 34) provides a convenient means to reference the structureof individual compounds. By definition, the first digit of thenumbering system represents one less than the number ofcarbon atoms in the compound molecule; the second digit, onemore than the number
11、 of hydrogen atoms in the compoundmolecule; and the third digit, the number of fluorine atoms inthe compound molecule. Unaccounted for valence require-ments are assumed to be chlorine atoms. For example, thedesignation HFC-123 indicates two carbon atoms (1 + 1), twohydrogen atoms (3-1), and four flu
12、orine atoms (4). The “a”designation at the end of the naming convention relates to the1This specification is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and is the directresponsibility of Subcommittee D26.09 on Fire Extinguishing Agents.C
13、urrent edition approved Feb. 1, 2017. Published February 2017. Originallyapproved in 2007. Last previous edition approved in 2012 as D7327-12. DOI:10.1520/D7327-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Boo
14、k of ASTMStandards volume information, refer to the standards Document Summary page 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 American Society of Heating, Refrigerating, and Air-Co
15、nditioning Engineers, Inc. (ASHRAE), 1791 Tullie Circle, NE, Atlanta, GA30329, http:/www.ashrae.org.5Available from U.S. Government Publishing Office (GPO), 732 N. CapitolStreet, NW, Washington, DC 20401-0001, http:/www.gpo.gov.6Available from Air-Conditioning, Heating, and Refrigeration Institute (
16、AHRI),2111 Wilson Blvd., Suite 500, Arlington, VA 22201, http:/www.ahrinet.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standa
17、rdization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.121 symmetry of the molecule.Example: CH2FCF3= HFC-134a4. Material Requirements4.1 Type I M
18、ixtures of HFC Blend B and Nitrogen: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 ofHFC Blend B within a container should not exceed that neededto achieve complete filling o
19、f the container at the maximumenvisaged storage temperature. For example, for the U.S. DOT4BA500 cylinder, the nitrogen partial pressure shall not exceed316 psig at 70 F (21.8 bar at 21 C) for a 58 lb/ft3(930 kg/m3)fill density (yielding a total pressure of 360 psig at 70 F (25.8bar at 21 C). For th
20、is example, the safe working pressure ofthe 4BA500 cylinder is not exceeded for temperatures below130 F (54 C).4.1.2 HFC Blend B shall conform to the requirementsprescribed in Table 1 when tested by appropriate test methods,such as those listed in Section 6.4.1.3 When a material analysis is required
21、, by agreementbetween the purchaser and the supplier, the total pressure in theHFC Blend B container, partial pressure of the N2, the filldensity of HFC Blend B within the container, and the maxi-mum safe storage temperature shall be part of the materialanalysis (certification). The pressure shall b
22、e reported inpound-force per square inch gage (preferred) or bar. The filldensity shall be reported in pounds per cubic foot at 70 F(preferred) or kilograms per cubic meter at 21 C. The maxi-mum safe storage temperature of the HFC Blend B containershall be reported in degrees Fahrenheit (preferred)
23、or indegrees Celsius and shall conform to applicable regulations forthe HFC Blend B container design and use.4.2 Type II, HFC Blend B shall conform to the requirementsof Type I, as listed in 4.1, and shall contain no more than 1.5% by volume non-absorbable non-condensable gases in vaporphase, expres
24、sed as air when tested by the appropriate testmethod(s) listed in Section 6.4.3 By agreement between the purchaser and the supplier,analysis may be required and limits established for elements orcompounds not specified in Table 1.4.4 Unless otherwise specified, Type II is assumed.4.5 WarningProlonge
25、d exposure to concentrations ofHFC Blend B in excess of 7.5 % by volume in air duringperiods of elevated adrenaline could produce cardiac arrhyth-mia in some personnel.5. Sampling5.1 Samples of HFC Blend B, taken from the liquid phase,shall be taken from filled containers in accordance with themetho
26、d specified in ISO 3427. The sampling cylinder shall becapable of safely resisting the vapor pressure of the sample atthe highest temperature that could be encountered.5.2 The HFC Blend B selected in accordance with 5.1 shallbe tested for quality conformance in accordance with Table 1.The presence o
27、f one or more defects shall be cause forrejection.6. Test Methods6.1 PurityConduct the analysis in accordance with Prac-tice D6806.6.2 AcidityConduct the analysis in accordance with themethod specified in 2008 Appendix C to AHRI Standard700-2014, Part 1.6.3 Water ContentConduct the analysis in accor
28、dancewith the method specified in 2008 Appendix C to AHRIStandard 700-2014, Part 2.6.4 Nonvolatile ResidueConduct the analysis in accor-dance with the method specified in 2008 Appendix C to AHRIStandard 700-2014, Part 3.6.5 Suspended Matter or SedimentWhile performing thenonvolatile residue analysis
29、, examine visually for any sus-pended matter or sediment. Observation of any suspendedmatter or sediment shall constitute failure of the test.7. Container, Packaging, and Package Marking7.1 Containers used for shipping and storage of HFC BlendB conforming to this specification shall be marked in acc
30、or-dance with Code of Federal Regulations (CFR) Title 49, Part172, Subpart D. The proper shipping name is “UN3163,Liquefied Gas, N.O.S., 2.2 (contains 1,1,1,2-Tetrafluorethane,Pentafluoroethane, Carbon Dioxide).” In addition to DOTrequirements, containers should be marked with the followinginformati
31、on as a minimum:7.1.1 Suppliers name and address,7.1.2 HFC Blend B, and7.1.3 Statement that material conforms to SpecificationD7327.8. Keywords8.1 1,1,1,2-tetrafluoroethane; carbon dioxide; CF3CF2H;CF3CFH2;CO2; HFC-134a; HFC Blend B; fire extinguishant;fire suppressant; Halotron7II; pentafluoroethan
32、e7Halotron is a registered trademark of American Pacific Corporation.TABLE 1 RequirementsProperty RequirementPurity 99 %, mol/mol, min (exclusive of any N2present)HFC-134a Content 86 5 %, mol/molHFC-125 Content 9 3 %, mol/molCO2Content 5 2 %, mol/molAcidity 1.0 ppm by mass, as HCL, maxWater content
33、20 ppm by mass, maxNonvolatile residue 0.01 % by weight, maxSuspended matter or sediment none visibleD7327 17221 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advi
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