| Summary: | In this study, the formation of natural gas liquid in gas distribution lines, particularly at regional stations, service boxes, customer installations, and gas meters, was investigated. The study aims to address the problems associated with natural gas liquid formation, such as interruption of supply and decreased efficiency of combustion devices. The indirect measurement of the hydrocarbon dew point was analyzed using C<sub>6+</sub> chromatograph data, and the model based on directly measured C<sub>6+</sub> data were converted into C<sub>6</sub>/C<sub>7</sub>/C<sub>8</sub> data by four different methods. As distinct from studies in the literature, this study experimentally determines the distribution of heavy hydrocarbons from C<sub>9</sub> to C<sub>19</sub> based on indirect methods for acquiring C<sub>8+</sub> data and direct measurement of C<sub>6+</sub> data. The hydrocarbon dew point temperature was calculated using the Peng–Robinson (PR) and Soave–Redlich–Kwong (SRK) equations of state. The results of the analysis performed on two city gate stations showed that the critical temperatures were 4.21 °C at a pressure of 10.81 bar and 8.27 °C at a pressure of 11.25 bar, respectively. These values were obtained from a model designed to determine the dew point temperature in the area where natural gas liquid formation was most prevalent. The experimental analysis and indirect measurements indicated the occurrence of a two-phase gas–liquid formation.
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