This paper discusses the influence of thermodynamic correction parameters on measuring the flow rate of natural gas in the reference condition. In particular, the principal aim is to experimentally evaluate the uncertainties of the correction parameters on volumetric flow rate measurement in the reference condition by means of conventional methods. An experimental analysis was carried out on the Italian distribution system which is very interesting from a metrological point of view since there are four different types of natural gas with a pressure and temperature range comprised respectively between 1.1 to 71 bar and 0 to 30°C.
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