1、Designation: D7327 12D7327 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
2、number 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 requirements for HFC Blend B as a fire-fighting medium.1.2 This specification does not address the fire-fight
3、ing equipment or hardware that employs HFC Blend B or the conditions ofemploying such equipment (for example, handhelds, fixed installations, etc.).1.3 This specification does not address the storage or transportation of HFC Blend B. Storage, handling, and transportationissues are addressed in Pract
4、ice D7326.1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard1.5 This standard does not purport to address all of the safety concerns,
5、if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. Specific cautionary statements are given in Section 4.2. Referenced Documents2.1 ASTM Stan
6、dards:2D7326 Practice for Handling, Transportation, and Storage of HFC Blend B (CH2FCF3, CHF2 CF3, and CO2)D6806 Practice for Analysis of Halogenated Organic Solvents and Their Admixtures by Gas Chromatography2.2 ISO Standards:Standard:3ISO 3427 Gaseous Halogenated Hydrocarbons (Liquefied Gases)Taki
7、ng of a Sample2.3 ASHRAE Standard:4ASHRAE 34 Designation and Safety Classification of Refrigerants2.4 U.S. Government Standards:5CFR Title 49, Part 172, Subpart D, U.S. Department of Transportation (DOT), Marking Requirements of Packaging forTransportationCFR Title 49, Part 172.101 Tables of Hazardo
8、us Materials and Special Provisions2.5 AHRI Standards:Standard:62008 Appendix C for Analytical Procedures for AHRI Standard 700-2006700-20143. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 HFChydrofluorocarbon; a chemical compound in which the compound molecule is comprised exc
9、lusively of hydrogen,chlorine, fluorine and carbon atoms.1 This specification is under the jurisdiction of ASTM Committee D26 on Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct responsibilityof Subcommittee D26.09 on Fire Extinguishing Agents.Current edition approved Sep
10、t. 1, 2012Feb. 1, 2017. Published October 2012February 2017. Originally approved in 2007. Last previous edition approved in 20072012as D7327- 07. -12. DOI: 10.1520/D7327-12.10.1520/D7327-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at servic
11、eastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standardsstandards Document Summary page on the ASTM website.3 Available fromAmerican National Standards Institute, 11 W. 42nd St., 13thInstitute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.10036, http:/www.ansi.o
12、rg.4 Available from American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. (ASHRAE), 1791 Tullie Circle, NE, Atlanta, GA 30329. 30329,http:/www.ashrae.org.5 Available from Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20036.U.S. Government Pub
13、lishing Office (GPO), 732 N. CapitolStreet, NW, Washington, DC 20401-0001, http:/www.gpo.gov.6 Available from Air-Conditioning, Heating, and Refrigeration Institute, Institute (AHRI), 2111 Wilson Blvd., Suite 500, Arlington, VA 22201.22201, http:/www.ahrinet.org.This document is not an ASTM standard
14、 and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases on
15、ly the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.2 HFC Blend Btertiary blend comprised of HFC-134a (1,1,1,2-tetrafluoroethane), HF
16、C-125 (pentafluoroethane), andcarbon dioxide (CO2); a compound used to inert, extinguish, or suppress a fire or explosion hazard.3.1.2.1 DiscussionThe terminology system for fluorine-containing compounds (described in detail in ASHRAE Standard 34) provides a convenientmeans to reference the structur
17、e of individual compounds. By definition, the first digit of the numbering system represents one lessthan the number of carbon atoms in the compound molecule; the second digit, one more than the number of hydrogen atoms inthe compound molecule; and the third digit, the number of fluorine atoms in th
18、e compound molecule. Unaccounted for valencerequirements are assumed to be chlorine atoms. For example, the designation HFC-123 indicates two carbon atoms (1 + 1), twohydrogen atoms (3-1), and four fluorine atoms (4). The “a” designation at the end of the naming convention relates to the symmetryof
19、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 that the safe working pressure of the receiving vessel is not exceeded. Toprevent excessive pressure, the fill density of HFC Blend B
20、 within a container should not exceed that needed to achieve completefilling of the container at the maximum envisaged storage temperature. For example, for the U.S. DOT 4BA500 cylinder, thenitrogen partial pressure shall not exceed 316 psig at 70F70 F (21.8 bar at 21C)21 C) for a 58 lb/ft3 (930 kg/
21、m3) fill density(yielding a total pressure of 360 psig at 70F70 F (25.8 bar at 21C).21 C). For this example, the safe working pressure of the4BA500 cylinder is not exceeded for temperatures below 130F (54C). 130 F (54 C).4.1.2 HFC Blend B shall conform to the requirements prescribed in Table 1 when
22、tested by appropriate test methods, such asthose listed in Section 6.4.1.3 When a material analysis is required, by agreement between the purchaser and the supplier, the total pressure in the HFCBlend B container, partial pressure of the N2, the fill density of HFC Blend B within the container, and
23、the maximum safe storagetemperature shall be part of the material analysis (certification). The pressure shall be reported in pound-force per square inch gage(preferred) or bar. The fill density shall be reported in pounds per cubic foot at 70F70 F (preferred) or kilograms per cubic meterat 21C.21 C
24、. The maximum safe storage temperature of the HFC Blend B container shall be reported in degrees Fahrenheit(preferred) or in degrees Celsius and shall conform to applicable regulations for the HFC Blend B container design and use.4.2 Type II, HFC Blend B shall conform to the requirements of Type I,
25、as listed in 4.1, and shall contain no more than 1.5 %by volume non-absorbable non-condensable gases in vapor phase, expressed as air when tested by the appropriate test method(s)listed in Section 6.4.3 By agreement between the purchaser and the supplier, analysis may be required and limits establis
26、hed for elements orcompounds not specified in Table 1.4.4 Unless otherwise specified, Type II is assumed.4.5 WarningProlonged exposure to concentrations of HFC Blend B in excess of 7.5 % by volume in air during periods ofelevated adrenaline could produce cardiac arrhythmia in some personnel.CAUTION:
27、 Prolonged exposure to concentrations of HFCBlend B in excess of 7.5 % by volume in air during periods of elevated adrenaline could produce cardiac arrhythmia in somepersonnel.5. Sampling5.1 Samples of HFC Blend B, taken from the liquid phase, shall be taken from filled containers in accordance with
28、 the methodspecified in ISO 3427. The sampling cylinder shall be capable of safely resisting the vapor pressure of the sample at the highesttemperature that could be encountered.TABLE 1 RequirementsProperty RequirementPurity 99 %, mol/mol, min (exclusive of any N2present)Purity 99 %, mol/mol, min (e
29、xclusive of any N2present)HFC-134a Content 86 5 %, mol/molHFC-125 Content 9 3 %, mol/molCO2 Content 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 1725.2 The HFC Blend B select
30、ed in accordance with 5.1 shall be tested for quality conformance in accordance with Table 1. Thepresence of one or more defects shall be cause for rejection.6. Test Methods6.1 PurityConduct the analysis in accordance with Practice D6806.6.2 AcidityConduct the analysis in accordance with the method
31、specified in 2008 Appendix C to AHRI Standard700-2006,700-2014, Part 1.6.3 Water ContentConduct the analysis in accordance with the method specified in 2008 Appendix C to AHRI Standard700-2006,700-2014, Part 2.6.4 Nonvolatile ResidueConduct the analysis in accordance with the method specified in 200
32、8Appendix C toAHRI Standard700-2006,700-2014, Part 3.6.5 Suspended Matter or SedimentWhile performing the nonvolatile residue analysis, examine visually for any suspendedmatter or sediment. Observation of any suspended matter or sediment shall constitute failure of the test.7. Container, Packaging,
33、and Package Marking7.1 Containers used for shipping and storage of HFC Blend B conforming to this specification shall be marked in accordancewith Code of Federal Regulations (CFR) Title 49, Part 172, Subpart D. The proper shipping name is “Compressed Gases. N.O.S.,(contains pentafluoroethane, carbon
34、 dioxide), 2.2, UN1956.” “UN3163, Liquefied Gas, N.O.S., 2.2 (contains 1,1,1,2-Tetrafluorethane, Pentafluoroethane, Carbon Dioxide).” In addition to DOT requirements, containers should be marked with thefollowing information as a minimum:7.1.1 Suppliers name and address,7.1.2 HFC Blend B, and7.1.3 S
35、tatement that material conforms to Specification D7327.8. Keywords8.1 HFC Blend B; 1,1,1,2-tetrafluoroethane; CFcarbon3CFH2; dioxide; HFC-134a; 1,1,1,2-tetrafluoroethane; CF3CF2H;CF3CFH2; CO2; carbon dioxide; HFC-134a; fire suppressant; HFC Blend B; fire extinguishant; fire suppressant; HalotronIIHa
36、lotron7; II; pentafluoroethaneASTM 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 advised that determination of the validity of any such patent rights, and the riskof in
37、fringement of such rights, are entirely their own responsibility.This standard 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 stand
38、ard or for additional standardsand should be addressed to ASTM International 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 vi
39、ews known to the ASTM Committee on Standards, at the address shown below.This 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 contact
40、ing 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ HalotronHalotron is a registered trademark of American Pacific Corporation.D7327 173
