Specification

NGA Extension calculates gas properties in compliance with norms:

Natural Gas

  • ISO 6976-95

Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition.

  • ASTM D 3588-98

Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels.

  • GPA 2172-09

Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures From Compositional Analysis.

Liquefied Petroleum Gas

  • ASTM D 2421-02

Standard Practice for Interconversion of Analysis of C5 and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Weight Basis.

  • ASTM D 2598-02

Standard Practice for Calculation of Certain Physical Properties of Liquefied Petroleum (LP) Gases from Compositional Analysis.

  • ISO 8973-97 / EN589-04

Liquefied petroleum gases - Calculation method for density and vapor pressure

Calculated properties according to norms

ISO 6976-95

  • Compression Factor (for real gas only)
  • Mean Molecular Weight
  • Relative Density
  • Density
  • Superior Calorific Value
  • Inferior Calorific Value
  • Wobbe Index

ASTM D 3588-98 and GPA 2172-09

  • Molar Mass
  • Molar Mass Ratio
  • Compressibility Factor
  • Relative Density
  • Ideal Heating Value (incl.calculations in BTU - British Thermal Units)
  • Real Heating Value (incl.calculations in BTU - British Thermal Units)

ASTM ASTM D 2421-02 and D 2598-02

  • Vapor Pressure
  • Relative Density
  • Motor Octane Number
  • Methane Number

ISO 8973-97 / EN589-04

  • Absolute Vapour Pressure (for Molar and Mass Percent only)
  • Gauge Vapour Pressure (for Molar and Mass Percent only)
  • Octane Number
  • Methane Number