Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition (ISO/DIS 6976:2015); German and English version prEN ISO 6976:2015
Gas-fired absorption and adsorption air-conditioning and/or heat pump appliances with a net heat input not exceeding 70 kW - Part 1: Safety; German version EN 12309-1:1999— 75 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.