1、Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody TransferGPA Standard 217214API Manual of Petroleum Measurement Standards Chapter 14.5THIRD EDITION, JANUARY 2014 ADOPTED AS TENTATIVE STANDARD, 1972 R
2、EVISED AND ADOPTED AS STANDARD, 1976 REVISED 1984, 1986, 1996, 2009REAFFIRMED 2014GAS PROCESSORS ASSOCIATION SIXTY SIXTY AMERICAN PLAZA,SUITE 700TULSA, OKLAHOMA 74135AMERICAN PETROLEUM INSTITUTE1220 L STREET, NWWASHINGTON, DC 20005API Special NotesAPI publications necessarily address problems of a g
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20、erly by API, 1220 L Street, N.W., Washington, D.C. 20005.Suggested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW,Washington, D.C. 20005, standardsapi.org.ContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions. . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Symbols and Abbreviated Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Background . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.1 Heating Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、 . 45.2 Relative Density. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.3 Compressibility Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . 45.4 Theoretical Hydrocarbon Liquid Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Summary of Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . 57 Equations for Custody Transfer Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57.1 Gross Heating Value (Volumetric Basis). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . 57.2 Relative Density. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67.3 Compressibility Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77.4 Theoretical Hydrocarbon Liquid Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Example Calculations . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Application Notes and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1110 Precision and Uncertainty . . . . . . . . . . . . . . .
30、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Annex A (informative) Details of Calculation Methods and Treatment of Water . . . . . . . . . . . . . . . . . . . . . . . . . 13Annex B (informative) Calculation of Gas Properties . . . . . . . . . .
31、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Annex C (informative) Water Content Example Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Annex D (informative) Calculation of NGL Energy Content from Volume. . . . . . . .
32、. . . . . . . . . . . . . . . . . . . . . . . 38Annex E (informative) Determination of Gas Energy Content per Unit Mass. . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Tables1 U.S. Multipliers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33、 . . . . . . . . . . . . . . . . . . . . . . . . . 62 Temperature Multipliers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Second Virial Coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10A.1 Assumed Composition of Air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19B.1 Calculation of Gas Properties at 60 F and 14.696 psia for a Dry Gas
35、. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20B.2 Calculation of Gas Properties 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 . . . . . . . . . . . . . .
36、 . . . 22B.4 Calculation of Gas Properties at Typical Base Conditions of 60 F and 14.65 psia for a Water Saturated Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23B.5 Calculation of Gas Properties at 60 F
37、 and 14.696 psia for a Water Saturated Gas at Flowing Conditions of 76 F and 28 psia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24B.6 Calculation of Gas Properties at 60 F and 14.65 psia for a Water Saturated Gas at Flowing Conditions of 7
38、6 F and 28 psia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25B.7 Calculation of Gas Properties at 60 F and 14.696 psia for a Measured and PartiallyWater Saturated Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26B.8 Calculation of Gas Properties at 60 F and 14.65 psia for a Measured and PartiallyWater Saturated Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40、 . . . . . 27PageB.9 Calculation of Gas Properties at 15 C and 101.325 kPa for a Water Saturated Gas. . . . . . . . . . . . . . . . . 28B.10 Calculation for Determining the C6+ Gas Properties Using Two Commonly Used Methods . . . . . . . . . . 29B.11 Calculation for Compressibility Using the Rigorou
41、s Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30C.1 Conversion Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33C.2 Mole Volume of Water Vapor at 60 F . . . . . . . . .
42、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C.3 Values of Constants A and B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37D.1 Calculate Energy Content from Liquid Mass .
43、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39D.2 Calculate Energy Content from Liquid Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39D.3 Calculate Energy Content from Equivalent Gas Volume .
44、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40E.1 Calculations 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,
45、 Calculation of Gross Heating Value, Specific Gravity and Compressibility Factor for Natural 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 standar
46、d also supersedes the GPM calculations in GPA Standard 2261, Analysis for Natural Gas and 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 T
47、able IV of GPA Standard 2261. This standard is for the use of those involved in custody 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.
48、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
49、Liquid Content for Natural Gas Mixtures for Custody Transfer 1 Scope This standard presents procedures for calculating, at base conditions from composition, the following properties of natural gas mixtures: gross heating value, relative density (real and ideal), compressibility factor and theoretical hydrocarbon liquid content which in the U.S. is typically expressed as GPM, the abbreviation for gallons of liquid per thousand cubic feet of gas. Rigorous calculation of the effect of water upon these calculations is complicated. Because this document relates primarily to custody
