FE-ISO20765-1, Ver. 1.01 is a program for MS Windows. FE-ISO20765-1 calculates the properties of a natural gas in accordance with International standards ISO 20765-1:2005, ISO 12213-2:2006 and ISO 6976:1995/Cor 1:1997

FE-ISO20765-1 user interface

FE-ISO20765-1 screenshot

FE-ISO20765-1 ReadMe
Ver 1.01, Apr 06, 2008

FE-ISO20765_1 is a program for MS Windows.
FE-ISO20765_1 calculates the properties of a natural gas mixture in accordance with:
  • ISO 20765-1:2005: Natural gas - Calculation of thermodynamic properties -
    Part 1: Gas phase properties for transmission and distribution applications
  • ISO 12213-2:2006: Natural gas - Calculation of compression factor -
    Part1: Introduction and guidelines
    Part2: Calculation using molar-composition analysis
  • ISO 6976:1995, TC-2:1997 and TC-3:1999: Natural gas - Calculation of calorific values, density and Wobbe index from composition.
The following are FE-ISO20765-1 ranges of application in accordance with ISO-20765-1:2005:

Parameter Range of application
Absolute Pressure [MPa] 10-7 to 30 MPa
Temperature [K] 250 to 350 K
Relative Density [] 0.55 to 0.90
Superior Calorific Value [MJ/m3] 20 to 48 MJ/m3
Mole percent ranges:
Methane [%] 70 to 100%
Nitrogen [%] 0 to 20%
Carbon dioxide [%] 0 to 20%
Ethane [%] 0 to 10%
Propane [%] 0 to 3.5%
Water [%] 0 to 0.015%
Hydrogen Sulfide [%] 0 to 0.02%
Hydrogen [%] 0 to 10%
Carbon Monoxide [%] 0 to 3%
Oxigen [%] 0 to 0.02%
i-Butane + n-Butane [%] 0 to 1.5%
i-Pentane + n-Pentane [%] 0 to 0.5%
n-Hexane [%] 0 t0 0.1%
n-Heptane [%] 0 to 0.05%
n-Octane + n-Nonane + n-Decane [%] 0 to 0.05%
Helium [%] 0 to 0.5%
Argon [%] 0 to 0.02%

Download "fe_20765x1.exe", the latest version of self-extracting and self-installing demo program. Run "fe_20765x1.exe" and follow the on-screen instructions. The default folder for installation is c:\ProgramFiles (x86)\fe_iso20765_1.
Note: The text box for Methane is locked in unregistered version and can not be changed but you can still verify all the possibilities and options of registered FE-ISO20765-1 software.
RUN FE-ISO20765-1
After completing the installation run the program using the 'Start' menu of your task bar or double click the fe_iso20765_1.exe from your Windows Explorer.
To start the calculation select 'Run' from 'Start' menu of your FE-ISO20765-1 menu bar.
To save the file select 'Save As' from FE-ISO20765-1 'File' menu. The default file extension is '.i20'
To open the existing file select 'Open' from FE-ISO20765-1 'File' menu.
To print the results of the calculation to your system printer select 'Print' from FE-ISO20765-1 'File' menu.
To print the calculation results into ASCII file select 'Print ASCII to File' from FE-ISO20765-1 'File' menu.
For the given, pressure in MPa, temperature in K and the natural gas mixture analysis (molar, volume or mass fractions) the FE-ISO20765-1 calculates the corresponding natural gas properties.
  • Compression
  • Density [kg/m3]
  • Molar density [kmol(m3]
  • Molar mass [kg/kmol]
  • Relative density at 273.15 K and 0.101325 MPa
  • Superior calorific value on a volumetric basis at (298.15K/273.15K/1.01325bar) [MJ*m3]
  • Molar internal energy [kJ/kmol]
  • Specific internal energy [kJ/kg]
  • Molar enthalpy [kJ/kmol]
  • Specific enthalpy [kJ/kg]
  • Molar entropy [kJ/(kmol K)]
  • Specific entropy [kJ/(kg K)]
  • Molar isochoric heat capacity [kJ/(kmol K)]
  • Specific isochoric heat capacity [kJ/(kg K)]
  • Molar isobaric heat capacity [kJ/(kmol K)]
  • Specific isobaric heat capacity [kJ/(kg K)]
  • Joule-Thomson coefficient [K/MPa]
  • Isentropic exponent
  • Speed of sound [m/s]
To convert your FE-ISO20765-1 demo program into fully functional version you need to buy the corresponding license.
After buying the license you will receive email with registration data, which will enable you to unlock your demo and convert it into the fully functional registered version.
To register the program, Run FE-ISO20765-1 as administrator! Select'Register' from 'Help' menu of your FE-ISO20765-1 menu bar and enter data exactly as described in the corresponding e-mail message.
This program is furnished under the license agreement and is protected by copyright law and international treaties.

You can download and try FELIB demonstration programs. Each demo-software is prepared as self-extracting and self-installing program for MS Windows environments.p>