1、Designation: D 2598 02 (Reapproved 2007)An American National StandardStandard Practice forCalculation of Certain Physical Properties of LiquefiedPetroleum (LP) Gases from Compositional Analysis1This standard is issued under the fixed designation D 2598; the number immediately following the designati
2、on indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers, by compositi
3、onal analysis, theapproximate determination of the following physical charac-teristics of commercial propane and special-duty propane(covered by Specification D 1835): vapor pressure, relativedensity, and motor octane number (MON).1.2 This practice is not applicable to any product exceedingspecifica
4、tions for nonvolatile residues. (See Test MethodD 2158.)1.3 For calculating motor octane number, this practice isapplicable only to mixtures containing 20 % or less of propene.1.4 For calculated motor octane number in method, thispractice is based on mixtures containing only componentsshown in Table
5、 1.1.5 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:2D 1267 Test Method for Gage Vapor Pressure of LiquefiedPetroleum (LP) Gases (LP-Gas Method)D 1657 Test Method for Density or Rela
6、tive Density ofLight Hydrocarbons by Pressure HydrometerD 1835 Specification for Liquefied Petroleum (LP) GasesD 2158 Test Method for Residues in Liquefied Petroleum(LP) GasesD 2163 Test Method for Analysis of Liquefied Petroleum(LP) Gases and Propene Concentrates by Gas Chromatog-raphy3D 2421 Pract
7、ice for Interconversion of Analysis of C5andLighter Hydrocarbons to Gas-Volume, Liquid-Volume, orMass Basis3. Summary of Practice3.1 The composition of a sample of LP-gas is obtained byusing Test Method D 2163 or other acceptable method. Fromthe analysis (expressed in liquid volume percent), the vap
8、orpressure, relative density, and motor octane number of thesample may be determined.3.2 Conversion of a compositional analysis from mole,gas-volume, or weight basis to liquid-volume is obtained byusing Practice D 2421 or other suitable method.4. Significance and Use4.1 Vapor pressure is an importan
9、t specification property ofcommercial propane and special duty propane that assuresadequate vaporization, safety, and compatibility with commer-cial appliances. Relative density, while not a specificationcriterion, is necessary for determination of filling densities andcustody transfer. The motor oc
10、tane number (MON) is useful indetermining the products suitability as a fuel for internalcombustion engines.5. Calculation5.1 Calculated LP-Gas Vapor Pressure (see Test MethodD 1267):5.1.1 Calculate the partial gage vapor pressure due to eachcomponent in the mixture as follows:Partial gage vapor pre
11、ssure 5 vp8 3 C!/100 (1)where:1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts and Lubricants and is the direct responsibility of Subcommittee D02.H0 onLiquefied Petroleum Gas.Current edition approved July 1, 2007. Published September 2007. Originallyapproved in 19
12、67. Last previous edition approved in 2002 as D 259802.2For 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 onthe ASTM website.3Withd
13、rawn.TABLE 1 Factors for Determining the Physical Characteristics ofLP-GasesAComponentVapor PressureBlend Factor,kPa(psig) at 37.8C(100F)RelativeDensity at15.6C (60F)MON BlendValueMethane 17547 (2545) 0.3 . . .Ethane 4213 (611) 0.35639 100.7Propane 1200 (174) 0.50736 97.1Propene 1469 (213) 0.52264 8
14、4.9n-Butane 255 (37) 0.58407 89.6i-Butane 400 (58) 0.56293 97.6AConstants for vapor pressure and motor octanes are empirical values to beused only in the calculation procedures described in this practice.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2
15、959, United States.vp8 = vapor pressure factor of specific component at 37.8C(100F) (see Table 1), andC = liquid volume percent of component in the mixture.5.1.2 Add the partial gage vapor pressures due to allcomponents, rounding to the nearest 7kPa (1psi). The total isreported as the LP-gas vapor p
16、ressure of the sample, kPa gageat 37.8C (100F).5.2 Calculated Relative Density (see Test Method D 1657):5.2.1 Calculate the relative mass of each component in themixture as follows:Relative mass of component 5 sg8 3 C!/100 (2)where:sg8 = relative density of the pure component at 15.6C(60F) (see Tabl
17、e 1), andC = liquid volume percent of component in the mixture.5.2.2 Add the relative mass of all components, rounding thetotal to three decimal places. The total is reported as therelative density of the mixture.5.3 Calculated Motor Octane Number (see ASTM DataSeries DS 4B.4).5.3.1 Calculate the pa
18、rtial motor octane number of eachcomponent in the mixture to the nearest 0.1 MON as follows:Partial motor octane number of component 5 m 3 C!/100 (3)where:m = motor octane number of component (see Table 1), andC = liquid volume percent of component in mixture.5.3.2 Add the partial motor octane numbe
19、rs of all compo-nents and round the total to the nearest one-half number. Thetotal is reported as the calculated motor octane number of themixture.6. Keywords6.1 liquefied petroleum gases; motor octane; relative den-sity; vapor pressureASTM International takes no position respecting the validity of
20、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 standard is subject to r
21、evision 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 International Headquarters. Yo
22、ur 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.This standard is cop
23、yrighted 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).4DS 4B, Physical Constants of Hydrocarbon and Non-Hydrocarbon Com-pounds, ASTM International, W. Conshohocken, PA, 1987.D 2598 02 (2007)2
