ASTM D1946-90 (2015) Standard Practice for Analysis of Reformed Gas by Gas Chromatography. DIN 51666-2007 Determination of composition for calculation of carbon content and calorific value of heating gas from refineries. Gas chromatography method. EN 15984-2011 Petroleum industry and products — Determination of composition of refinery heating gas and calculation of carbon content and calorific value — Gas chromatography method. UOP 539-97 Refinery gas Analysis by gas chromatography.