1、Designation: D7327 12Standard 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 caution-ary statements are given in Section 4.2. Referenced Documents2.1 ASTM Standards:2D7
6、326 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 Standards:3ISO 3427 Gaseous Halogenated Hydrocarbons (LiquefiedGases)Taking of a Sample2.3 AS
7、HRAE 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 Sp
8、ecial Provisions2.5 AHRI Standards:62008 Appendix C for Analytical Procedures for AHRI Stan-dard 700-20063. 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, fluor
9、ine 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 co
10、mpounds (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 nu
11、mber 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
12、 fluorine 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 Agen
13、ts.Current edition approved Sept. 1, 2012. Published October 2012. Originallyapproved in 2007. Last previous edition approved in 2007 as D7327- 07. DOI:10.1520/D7327-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annua
14、l Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.4Available from American Society of Heating, Refrigerating, and Air-Conditioning Engineers,
15、 Inc. (ASHRAE), 1791 Tullie Circle, NE, Atlanta, GA30329.5Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20036.6Available from Air-Conditioning, Heating, and Refrigeration Institute, 2111Wilson Blvd., Suite 500, Arlington, VA 22201.Copyright ASTM Internati
16、onal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1symmetry of the molecule.Example: CH2FCF3= HFC-134a4. Material Requirements4.1 Type I Mixtures of HFC Blend B and Nitrogen:4.1.1 The nitrogen (N2) partial pressure shall be such thatthe safe working pressure of
17、 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 of the container at the maximumenvisaged storage temperature. For example, for the U.S. DOT4BA500 cylinder, the nitrogen par
18、tial pressure shall not exceed316 psig at 70F (21.8 bar at 21C) for a 58 lb/ft3(930 kg/m3)fill density (yielding a total pressure of 360 psig at 70F (25.8bar at 21C). For this example, the safe working pressure of the4BA500 cylinder is not exceeded for temperatures below130F (54C).4.1.2 HFC Blend B
19、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, by agreementbetween the purchaser and the supplier, the total pressure in theHFC Blend B container, partial pressure of the N2,
20、 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 be reported inpound-force per square inch gage (preferred) or bar. The filldensity shall be reported in pounds per cubic foot at 7
21、0F(preferred) or kilograms per cubic meter at 21C. The maxi-mum safe storage temperature of the HFC Blend B containershall be reported in degrees Fahrenheit (preferred) or indegrees Celsius and shall conform to applicable regulations forthe HFC Blend B container design and use.4.2 Type II, HFC Blend
22、 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, expressed as air when tested by the appropriate testmethod(s) listed in Section 6.4.3 By agreement between the purchaser and the supplier
23、,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 CAUTION: Prolonged exposure to concentrations ofHFC Blend B in excess of 7.5 % by volume in air duringperiods of elevated adrenaline could produce
24、 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 themethod specified in ISO 3427. The sampling cylinder shall becapable of safely resisting the vapor pressure of the sample atthe highest
25、 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 of one or more defects shall be cause forrejection.6. Test Methods6.1 PurityConduct the analysis in accordance with Prac-tice D680
26、6.6.2 AcidityConduct the analysis in accordance with themethod specified in 2008 Appendix C to AHRI Standard700-2006, Part 1.6.3 Water ContentConduct the analysis in accordancewith the method specified in 2008 Appendix C to AHRIStandard 700-2006, Part 2.6.4 Nonvolatile ResidueConduct the analysis in
27、 accor-dance with the method specified in 2008 Appendix C to AHRIStandard 700-2006, Part 3.6.5 Suspended Matter or SedimentWhile performing thenonvolatile residue analysis, examine visually for any sus-pended matter or sediment. Observation of any suspendedmatter or sediment shall constitute failure
28、 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 accor-dance with Code of Federal Regulations (CFR) Title 49, Part172, Subpart D. The proper shipping name is “CompressedGases. N.O.S
29、., (contains pentafluoroethane, carbon dioxide),2.2, UN1956.” In addition to DOT requirements, containersshould be marked with the following information as a mini-mum: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 HF
30、C Blend B; CF3CFH2; HFC-134a; 1,1,1,2-tetrafluoroethane; CF3CF2H; CO2; carbon dioxide; fire sup-pressant; fire extinguishant; Halotron II7; pentafluoroethane7Halotron is a trademark of American Pacific Corporation.TABLE 1 RequirementsProperty RequirementPurity 99 %, mol/mol, min (exclusive of any N2
31、present)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 20 ppm by mass, maxNonvolatile residue 0.01 % by weight, maxSuspended matter or sediment none visibleD7327 122ASTM International takes no position respecti
32、ng the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This stand
33、ard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Internation
34、al Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.T
35、his standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D7327 123
