Natural gas - Calculation of thermodynamic properties - Part 1: Gas phase properties for transmission and distribution applications (ISO 20765-1:2005)— 50 стр.
Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition (ISO 6976:2016); German version EN ISO 6976:2016— 67 стр.
Natural gas - Calculation of compression factor - Part 2: Calculation using molar-composition analysis (ISO 12213-2:2006); German version EN ISO 12213-2:2009— 39 стр.
Natural gas - Calculation of thermodynamic properties - Part 1: Gas phase properties for transmission and distribution applications (ISO 20765-1:2005); German and English version prEN ISO 20765-1:2016