GB/T 17747.1-2011
Natural gas.Caculation of compression factor.Part 1: Introduction and guidelines (English Version)

Standard No.

GB/T 17747.1-2011

Language

Chinese, Available in English version

Release Date

2011

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 17747.1-2011

Replace

GB/T 17747.1-1999

Scope

This part of GB/T 17747 specifies the compression factor calculation method for natural gas, natural gas containing artificial admixtures and other similar mixtures that exist only in gaseous state. The "Calculation of Natural Gas Compressibility Factor" standard includes 3 parts. Part 1 includes an introduction and guidance for the computational methods described in Parts 2 and 3. Part 2 gives the method of calculating the compressibility factor with the detailed molar composition of the known gas, also known as the AGA8-92DC calculation method. Section 3 gives calculations using non-detailed analytical data including available high calorific value (volume basis), relative density, C0₂ content and H₂ content (if not zero). The compression factor method is also known as the SGERG-88 calculation method. The two calculation methods are mainly applied to the dry gas transported by pipeline within the range of normal gas transmission and gas distribution conditions, including transfer metering or other metering for settlement. Usually, the operating temperature of gas transmission and distribution is 263 K to 338 K (about -10 °C to 65 °C), and the operating pressure does not exceed 12 MPa. Within this range, the expected uncertainty for both calculations is approximately 0.1%, excluding the uncertainties of the input data including the associated pressure and temperature. The AGA8-92DC calculation method provided by GB/T 17747.2 is also applicable to a wider range of temperatures and higher pressures, including a wider category of natural gas including wet gas and sour gas, such as in storage gas reservoir or underground gas storage conditions, or in natural gas vehicle (NGV) applications, with increased uncertainties. The SGERG-88 calculation method provided by GB/T 17747.3 is applicable to the N₂, C0₂ and C₂H₆ content higher than the common content in pipeline gas gas. The method can also be applied over wider temperature and pressure ranges, but with increased uncertainty. Under the specified conditions, the gas temperature is above the water dew point and the hydrocarbon dew point, and the two calculation methods are valid. GB/T 17747.2 and GB/T 17747.3 give all the equations and numerical values required by the AGA8-92DC and SGERG-88 calculation methods. For verified computer programs, see Appendix B of GB/T 17747.2-2011 and GB/T 17747.3-2011.

GB/T 17747.1-2011 Referenced Document

• GB/T 11062-1998 Natural gas--Calculation of calorific values, density, relative density and Wobbe index from composition
• GB/T 17747.2-2011 Natural gas.Calculation of compression factor.Part 2: Calculation using molar-composition analysis *， 2011-12-30 Update
• GB/T 17747.3-2011 Natural gas.Caculation of compression factor.Part 3: Caculation using physical properties
• GB/T 19205-2008 Natural gas.Standard reference conditions

GB/T 17747.1-2011 history

• 2011 GB/T 17747.1-2011 Natural gas.Caculation of compression factor.Part 1: Introduction and guidelines
• 1999 GB/T 17747.1-1999 Natural gas--Calculation of compression factor--Part 1: Introduction and Guidelines

GB/T 17747.1-2011 -All Parts