1、Designation: D 6126 97 (Reapproved 2003)e1Standard Specification forHFC-23 (Trifluoromethane, CHF3)1This standard is issued under the fixed designation D 6126; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEEditorial changes were made in December 2003.1. Scope1.1 This specification covers the requirements for HFC-23as a fire fighting mediu
3、m.1.2 This specification does not address the fire fightingequipment or hardware that employs HFC-23 or the conditionsof employing such equipment (for example: handshields, fixedinstallations, etc.).1.3 This specification does not address the storage ortransportation of HFC-23 Storage handling, and
4、transportationissues are addressed in Practice D 6127.1.4 The values 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
5、 this specification: This standarddoes not purport to address all of the 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.2.
6、Referenced Documents2.1 ASTM Standards:2D 4081 Specification for Dry-Cleaning Grade Perchloroet-hyleneD 6127 Practice for Handling, Transportation, and Storageof HFC-232.2 ISO Standards:ISO 3363 Fluorinated Hydrocarbons for Industrial Use -Determination of Acidity - Titration Method3ISO 3427 Gaseous
7、 Halogenated Hydrocarbons (LiquefiedGases) - Taking a Sample3ISO 5789 Fluorinated Hydrocarbons for Industrial Use -Determination of Nonvolatile Residue32.3 CGA Standards:No. C4, American National Standard Method of MarkingPortable Compressed Gas Containers to Identify theMaterial Contained4No. P-1,
8、Safe Handling of Compressed Gases in Contain-ers42.4 U.S. Governmental Standards:Code of Federal Regulations (CFR) Title 49, Part 172.101Tables of Hazardous Materials and Special Provisions5DOT-E 9491, Exception to Code of Federal Regulations(CFR) Title 49, Part 173.302 and Part 173.3045Code of Fede
9、ral Regulations (CFR) Title 49, Part 173.302and 173.304 Preparation and Packaging of Gases5Code of Federal Regulations (CFR) Title 49, Part 172 SubD Marking Requirements of Packaging for Transporta-tion52.5 American Society of Refrigeration Engineers:ASRE Standard 34, Designation of Refrigerants63.
10、Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 halogenated hydrocarbonthe halogenated com-pound coding terminology system provides a convenientmeans to reference halogenated hydrocarbons, ASRE 34.Halogenated hydrocarbons are saturated hydrocarbons inwhich one or more of the hydr
11、ogen atoms have been replacedby atoms of the halogen series (fluorine, chlorine, bromine, and1This specification is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and is the direct responsibility of SubcommitteeD26.09 on Halogenated Fire Extinguishants.Current edition ap
12、proved May 10, 1997. Published June 1998.2Annual Book of ASTM Standards, Vol 15.05.For 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 pag
13、e onthe ASTM website.3Available from American National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.4Available from the Compressed Gas Association.5Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20036.6Available from American Society
14、of Refrigeration Engineers, RefrigerationEngineering 65. 49 (1957).1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.iodine). It is convention to prefix the number with an abbre-viation of the compound:CFC = chlorofluorocarbonHCFC = hy
15、drochlorofluorocarbonHFC = hydrofluorocarbonFC = fluorocarbonR = refrigerant3.1.1.1 DiscussionBy definitions, the right most digit ofthe numbering system is the number of fluorine atoms.3.1.1.2 DiscussionThe second digit from the right is thenumber of hydrogen atoms plus one (+1).3.1.1.3 DiscussionT
16、he third digit from the right is oneless (-1) than number of carbon atoms in the compound (whenthis number is zero (0) it is omitted from the number.3.1.1.4 DiscussionUnaccounted for valance requirementsare assumed to be chlorine atoms.3.1.1.5 DiscussionWhen the compound contains bromineor iodine, t
17、he same rules apply except the letter “B” forbromine or “I” for iodine follows the parent compounddesignated number and the number of the atoms is placed afterthe letter.3.1.1.6 DiscussionExampleCHF3= R-23 = HFC-23.3.1.2 HFC-237the compound trifluoromethane; CHF3.4. Material Requirements4.1 Nitrogen
18、 (N2) partial pressure is not required for thisproduct, it is shipped neat. The saturated vapor pressure ofHFC-23 is 42 bars at 21C (610 psig at 70F). HFC-23 has acritical temperature of 25.9C (78.6F). The filling densityshould be that which will not liquid fill the container attemperatures below 25
19、.9C (78.6F) or exceed 5/4 the pressurerating of the container at 130 F. For example, the U.S. DOT3AL cylinder with a minimum working pressure of 1800 psigshall not exceed 42 bar at 21C (610 psig at 70F) for amaximum filling density of 84.4 %. For this example thecylinder pressure is 141 bars at 54C
20、(2045 psig at 130F).4.1.1 HFC-23 shall conform to the requirements prescribedin Table 1 when tested by the appropriate test method(s) listedin Section 6.4.1.2 When material analysis is required, by agreementbetween the purchaser and the supplier, the total pressure in theHFC-23 container, the fill d
21、ensity of the HFC-23 within thecontainer, and the maximum safe storage temperature shall bepart of the material analysis (certification). The pressure shallbe reported in bar (preferred) or pound-force per square inchgage (psig). The fill density shall be reported in kilograms percubic metre at 21C
22、(preferred) or pounds per cubic foot at70F. The maximum safe storage temperature of the HFC-23shall be reported in degrees Celsius (preferred) or in degreesFahrenheit and shall conform to the applicable regulations forthe HFC-23 container design and use.4.2 By agreement between the purchaser and the
23、 supplier,analysis may be required and limits established for elements orcompounds not specified in Table 1.4.3 Product RequirementsSee Table 1.5. Sampling5.1 Samples of HFC-23, taken from the liquid phase, shallbe taken from filled containers in accordance with the methodspecified in ISO 3427. The
24、sampling bottle shall be capable ofsafely resisting the vapor pressure of the sample at the highesttemperature that could be encountered.5.2 The HFC-23 selected in accordance with 5.1 shall betested for quality conformance in accordance with Section 6.The presence of one or more defects shall be cau
25、se forrejection.6. Test Methods6.1 Purity:6.1.1 Determine the purity by gas chromatography in accor-dance with the technique described in 6.1.2-6.1.5 or anotheracceptable laboratory technique providing equivalent results.6.1.2 ApparatusThe following special apparatus is re-quired to determine the pe
26、rcent HFC-23.6.1.2.1 Gas Chromatograph, equipped with a thermal con-ductivity detector (TCD) and an integrator, 1-mV recorder, orother output device.6.1.2.2 Chromatographic Column, 6.0 ft (m) length by 1/8in. (mm) outside diameter (OD) stainless steel tubing, packedwith 80 to 100 mesh PORAPAK Q or e
27、quivalent. (Column isavailable prepacked from any chromatographic supply vender).6.1.2.3 Gas Sampling Valve, 1 ml volume or a volumesufficient to achieve proper separation and peak area for thespecified column.6.1.3 Reagents:6.1.3.1 The carrier gas shall be a chromatographic grade ofHelium.6.1.3.2 T
28、he column packing shall be 80 to 100 meshPORAPAK Q or equivalent.6.1.4 Procedure:6.1.4.1 Install the column in the gas chromatograph and setthe oven temperature to 45C, injection port to 175C, detectorblock to 200C. The oven temperature is programmed to holdat 45C for 2 min, then to rise 10C/min, to
29、 a maximum of150C.6.1.4.2 Adjust the column helium flow to 20 mL/min.6.1.4.3 Adjust the detector voltage to the mid-range of thethermal conductivity detector (TCD) and allow the instrumentto equilibrate.6.1.4.4 Take the sample from the liquid phase (invertedcylinder). Flush the sample loop and valve
30、 for approximately30 s.6.1.4.5 Rotate the sample valve to transfer the sample intothe chromatograph and note the time.7FE-13y is the registered trademark for HFC-23 and is manufactured by E.I.Dupont de Nemours Co., Wilmington, DE.TABLE 1 RequirementsProperty RequirementHFC-23 purity, %, mol/mol, max
31、 99.0Acidity, ppm by mass, as HCI, max 3.0Water content, ppm by mass, max 10Nonvolatile residue, % by weight, max 0.08Suspended matter or sediment none visibleD 6126 97 (2003)e126.1.4.6 Close the sample cylinder valve.6.1.4.7 Allow the sample to elute for approximately 15 min,Attenuating as necessar
32、y to make the peak height a convenientsize. Under proper instrument settings, air (N2O2) should eluteafter about 0.4 min and HFC-23 should elute after approxi-mately 2 min.6.1.5 Calculation:6.1.5.1 Calculate percent HFC-23 as follows:% HFC223 5 AII100!/AT(1)where:AII= area of the HFC-23 peak (peak a
33、rea 3 attenuation),andAT= sum of all the relevant peak areas excluding thenitrogen (air) peak (peak area 3 attenuation).6.1.5.2 Percent HFC-23 below that specified in Table 1 shallconstitute failure by this test method.6.2 AcidityVaporize a large sample in the presence ofdistilled water. Determine t
34、he acidity of the solution by theappropriate method specified in ISO 3363, titration in accor-dance with 6.2.1.2 through 6.2.2.3, a pH indicator, or anotheracceptable laboratory technique providing equivalent results.6.2.1 Sodium Hydroxide Titration:6.2.1.1 Reagents:6.2.1.2 Sodium Hydroxide, 0.01 N
35、solution, standardizedagainst reagent grade potassium acid phthalate.6.2.1.3 Methyl Red Indicator, 0.1 % solution.6.2.1.4 ProcedurePlace 10 mL of distilled water - crushedice (made from distilled water) slurry in a 250 mL Erlenmeyerflask. Sparge 50 g of the HFC-23 into the slurry. Looselystopper the
36、 flask and swirl the flask gently form time to timeuntil the ice is completely melted. Add one drop of methyl redindicator, swirl, and if a reddish color remains, titrate to ayellow endpoint with 0.01 N sodium hydroxide solution. Runa crushed ice distilled water blank (no HFC-23) along with thesampl
37、e.6.2.1.5 CalculationCalculate parts per million acid ha-lides, as HCl, as follows:acid halides, ppm 5A 2 B! 3 N NaOH 3 0.03645 3 106weight of sample, grams(2)where:A = NaOH for sample, mL,B = NaOH for blank, mL,N = normality of the NaOH solution,NaOH = sodium hydroxide, and0.03645 3 106= factor to
38、express result as ppm HCl(hydrogen chloride).6.2.1.6 Acid halides in excess of that specified in Table 1shall constitute failure by this test method.6.3 Water ContentsTest HFC-23 for water content. Theaccuracy of the results and the standard method shall be byKarl Fisher method. The analysis may be
39、conducted by thephosphorous pentoxide method, infrared absorption, electronicmoisture analysis, piezoelectric analyzer, or another acceptablelaboratory technique. Water content greater than specified inTable 1 shall constitute failure by this test method.6.4 Nonvolatile ResidueDetermine the nonvolat
40、ile resi-due in accordance with the method specified in ISO 5789 oranother accepted laboratory technique providing equivalentresults. Determine 6.5 (suspended matter or sediment) whileperforming this analysis.6.5 Suspended Matter or SedimentWhile performing thenonvolatile residue analysis, examine v
41、isually for any sus-pended matter or sediment. Observation of any suspendedmatter or sediment shall constitute failure by this method.7. Container, Packaging, and Package Marking7.1 Containers used for shipping and storage of HFC-23conforming to this specification shall be marked in the accor-dance
42、with Code of Federal Regulations (CFR) Title 49, Part172 Sub D. HFC-23 has a critical temperature of 25.9C(78.6F). Therefore, the proper shipping name (49 CFR172.101) is “Compressed gas, n.o.s.”. The DOT exemption thatcontains this information is DOT-E 9491. In addition to DOTrequirements containers
43、 must be marked with the followinginformation as a minimum:7.1.1 Suppliers name and address,7.1.2 HFC-23 (trifluoromethane), and7.1.3 Statement that material conforms to ASTM Specifica-tion D 6126.8. Keywords8.1 CHF3; FE-13y; fire fighting; fire fighting agent; fireprotection; fire suppressant; HFC-
44、23; hydrofluorocarbon;trifluoromethaneASTM 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 r
45、iskof infringement 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 t
46、his standard 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 shouldmak
47、e your views 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 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).D 6126 97 (2003)e13
