AGA Report NoWord文档格式.docx

1、DETAIL and GROSS Equations of StatePrepared byAGA Transmission Measurement CommitteeAGA 8, Part 1/API 14.2.1Third Edition, 2017Copyright 2017 American Gas AssociationAll Rights ReservedDISCLAIMERS AND COPYRIGHTTo be added later by AGA 1992,1994, 2003, and 2016 American Gas Association, All Rights Re

2、served.11PREFACEThis AGA Report No. 8, Part 1, provides all of the technical information necessary to compute thermodynamic properties including compressibility factors, densities, and speeds of sound for natural gas and related gases. Historical documentation linking these equations and calculation

3、s to prior methods are included. The document also provides analyses of calculation uncertainties for various gas compositions. It is based on research managed and sponsored by the Gas Research Institute （GRI） and the Groupe Europeen de Recherches Gazieres （GERG） in cooperation with AGA. It supersed

4、es the 1985, 1992, and 1994 editions of AGA Report Number 8, and gives identical results to the International Standards Organization Document ISO 12213, Natural Gas - Calculation of Compression Factors. No changes were made to the parameters used to calculate the compressibility factor; therefore, n

5、o change is required from the 1994 edition to maintain the stated accuracy when a particular gas falls within the new uncertainty statements listed herein.The documentation of programs for calculating properties from the equations of state described in this work has been moved to supplementary mater

6、ial for this standard. New example programs, available in the supplementary material, are available in Fortran, VB, and C+. The supplementary material also contains a Microsoft Excel spreadsheet to calculate properties. A file containing calculated points is included that can be used to verify that

7、any implementation produces values that are in agreement with this standard. Many points are given at different compositions （not necessarily related to typical natural gases） to test that the coefficients and parameters for each component have been applied correctly.The AGA-10 publication on the ca

8、lculation of the speed of sound has been discontinued with the release of this revision of AGA-8. The calculation of all thermodynamic properties is fully documented here. The calculations described in this work no longer require integration of the compressibility factor equation as done in AGA-10,

9、but is implemented through differentiation of the fundamental Helmholtz energy equation of state. This results in faster calculations through direct computation of the required derivatives.Implementation decisions are left to the user; however, the calculation method chosen for density and compressi

10、bility factors can be reinforced by the uncertainty statements and example calculations contained herein. Adoption of these new guidelines and equations is encouraged for all gas measurement applications.This revised edition, now designated as AGA Report No. 8, Part 1, uses the same DETAIL and GROSS

11、 equations of state as in the 1994 edition of AGA Report No. 8. The calculation methods for GROSS and DETAIL have not changed in this part. However, the temperature, pressure, and composition limits for different levels of uncertainties have been modified.The Excel spreadsheet that is provided in th

12、e supplementary material can be used to determine if a user,s applicable inputs - temperature, pressure, and composition - are still within the desired uncertainty limit even though one or more of these inputs may be outside the ranges given in the report.The new Part 2, based on the GERG-2008 equat

13、ion of state, is applicable outside the temperature, pressure, and composition ranges of Part 1, with uncertainties within 0.1 %. The GERG-2008 equation can also be used for operating conditions and compositions that are applicable for Part 1, with differences in the calculated values that are withi

14、n the uncertainty limits of each equation.This document does not require upgrading existing code for the calculations of properties if the state conditions fall within the regions of 0.1 % uncertainty listed in this document. The decision to upgrade existing code shall be at the discretion of the pa

15、rties involved.The user is encouraged to use the calculation tools provided with this edition of the document to determine the impact to their own operation, and is advised to review the changes and take appropriate measures for calculation of properties. If the applicable temperature, pressure, and composition are within the user,s acceptable levels of uncertainties, the user may continue to use the current software based on the 1994 edition of AGA 8.IllACKNOWLEDGEMENTSIVTABLE OF CONTENTSDISCLAIMERS AND COPYRIGHTiiACKNOWLEDGEMENTSiv1 INTRODUCTION11.1 Scope11.2 Background11.3 Overview of