Assessment of calorific value at a gas transmission network

A method to determine the combined calorific value uncertainty of a number of chromatographic systems, in order to assess their performance, is proposed. Using this method the uncertainty of calorific value, determined from gas analysis of various chromatographic systems at the central – north region of the Hellenic Gas Transmission System, is estimated. Real gas calorific value data, from the same chromatographic systems of the selected region, are then evaluated. Analysis of data reveals that calorific values of natural gas are measured within acceptable tolerance for the systems studied. This uncertainty estimation method can be applied for various regions of gas transmission systems and time periods, with similar characteristics.