This document specifies procedures for the calculation of calorific value, calorific value, density, relative density and upper and lower Wobbe index of natural gases, natural gas exchange gases and other fuel gases when the composition of the gas in mole fractions is known. Using the established procedures, the properties of the gas mixture can be calculated under commonly used reference conditions.
EN ISO 6976:2016 Referenced Document
ISO 14912:2003 Gas analysis - Conversion of gas mixture composition data
ISO 20765-2:2015 Natural gas - Calculation of thermodynamic properties - Part 2: Single-phase properties (gas, liquid, and dense fluid) for extended ranges of application
ISO 6974-1:2012 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition
ISO 6974-2:2012 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations