1、Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody TransferGPA Standard 217209API Manual of Petroleum Measurement Standards Chapter 14.5THIRD EDITION, JANUARY 2009REAFFIRMED, FEBRUARY 2014ADOPTED AS TE
2、NTATIVE STANDARD, 1972REVISED AND ADOPTED AS STANDARD, 1976REVISED 1984, 1986, 1996, 2009GAS PROCESSORS ASSOCIATION6526 EAST 60TH STREETTULSA, OKLAHOMA 74145AMERICAN PETROLEUM INSTITUTE1220 L STREET, NWWASHINGTON, DC 20005Calculation of Gross Heating Value, Relative Density, Compressibility and Theo
3、retical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody TransferGPA Standard 217209API Manual of Petroleum Measurement Standards Chapter 14.5THIRD EDITION, JANUARY 2009REAFFIRMED, FEBRUARY 2014ADOPTED AS TENTATIVE STANDARD, 1972REVISED AND ADOPTED AS STANDARD, 1976REVISED 1984, 1986,
4、 1996, 2009GAS PROCESSORS ASSOCIATION6526 EAST 60TH STREETTULSA, OKLAHOMA 74145AMERICAN PETROLEUM INSTITUTE1220 L STREET, NWWASHINGTON, DC 20005API Special NotesAPI publications necessarily address problems of a general nature. With respect to particular circumstances, local,state, and federal laws
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22、d and should be submitted to the Standards Department, API, 1220 L Street, NW,Washington, D.C. 20005, standardsapi.org.ContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . 12 Normative References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . . . . . . . . . . 14 Symbols and Abbreviated Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . . . . . . . . . . . . . . . 45.1 Heating Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.2 Relative Density. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.3 Compressibility Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.4 Theoretical Hydrocarbon Liquid Content . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Summary of Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Equations for Custody Transfer Calcul
28、ations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57.1 Gross Heating Value (Volumetric Basis). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57.2 Relative Density. . . . . . . . . . . .
29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.3 Compressibility Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77.4 Theore
30、tical Hydrocarbon Liquid Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Example Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
31、19 Application Notes and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1110 Precision and Uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、 . . . . . 12Annex A (informative) Details of Calculation Methods and Treatment of Water . . . . . . . . . . . . . . . . . . . . . . . . . 13Annex B (informative) Calculation of Gas Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Annex C (in
33、formative) Water Content Example Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Annex D (informative) Calculation of NGL Energy Content from Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Annex E (informative) Determination of
34、Gas Energy Content per Unit Mass. . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Tables1 U.S. Multipliers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Temperature Multipliers . . . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Second Virial Coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10A.1 Assumed Com
36、position of Air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19B.1 Calculation of Gas Properties at 60 F and 14.696 psia for a Dry Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20B.2 Calculation of Gas Proper
37、ties at 60 F and 14.65 psia for a Dry Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21B.3 Calculation of Gas Properties at 60 F and 14.696 psia for a Water Saturated Gas . . . . . . . . . . . . . . . . . 22B.4 Calculation of Gas Properties at Typical Base Conditions of 60 F and 14.65
38、 psia for a Water Saturated Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23B.5 Calculation of Gas Properties at 60 F and 14.696 psia for a Water Saturated Gas at Flowing Conditions of 76 F and 28 psia .
39、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24B.6 Calculation of Gas Properties at 60 F and 14.65 psia for a Water Saturated Gas at Flowing Conditions of 76 F and 28 psia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40、 . . . . . . . . . . . . . . . . 25B.7 Calculation of Gas Properties at 60 F and 14.696 psia for a Measured and PartiallyWater Saturated Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26B.8 Calculation of
41、Gas Properties at 60 F and 14.65 psia for a Measured and PartiallyWater Saturated Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27PageB.9 Calculation of Gas Properties at 15 C and 101.325 kPa for a Water
42、Saturated Gas. . . . . . . . . . . . . . . . . 28B.10 Calculation for Determining the C6+ Gas Properties Using Two Commonly Used Methods . . . . . . . . . . 29B.11 Calculation for Compressibility Using the Rigorous Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30C.1 Con
43、version Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33C.2 Mole Volume of Water Vapor at 60 F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44、. . . 35C.3 Values of Constants A and B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37D.1 Calculate Energy Content from Liquid Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45、. . . . . 39D.2 Calculate Energy Content from Liquid Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39D.3 Calculate Energy Content from Equivalent Gas Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40E.1 Calc
46、ulations for Btu per Pound for Water Saturated Gas at Base Conditions. . . . . . . . . . . . . . . . . . . . . . 41IntroductionThis standard supersedes previous editions of GPA Standard 2172/API MPMS Chapter 14.5, Calculation of Gross Heating Value, Specific Gravity and Compressibility Factor for Na
47、tural Gas Mixtures from Compositional Analysis and it incorporates and supersedes GPA Reference Bulletin 181, Tentative Reference Bulletin Heating Value as a Basis for Custody Transfer of Natural Gas. This standard also supersedes the GPM calculations in GPA Standard 2261, Analysis for Natural Gas a
48、nd Similar Gaseous Mixtures by Gas Chromatography and GPA Standard 2286, Tentative Method of Extended Analysis for Natural Gas and Similar Gaseous Mixtures by Temperature Programmed Gas Chromatography as well as Table IV of GPA Standard 2261. This standard is for the use of those involved in custody
49、 transfer of natural gas. Unless fixed by statute, it is the responsibility of the parties to contracts to agree on procedures for determining volumes, heating values and standard conditions for custody transfer. This standard is similar to ISO 6976, Natural gas Calculation of calorific values, density, relative density and Wobbe index from composition, and to AGA Report No. 5, Natural Gas Energy Measurement. 1 Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody Transfer 1 Scope
