Considerations for the dew point calculation in rich natural gas

•C7+ fraction splitting is recommended for rich natural gases equilibrium.•Van der Waals forms of EoS are fairly accurate for HCDP.•Gas condensate dew point is fairly predicted by typical correlations.•Temperature dependant parameters should be adjusted for extensive rich gas databases.•Simple mixing rules are accurate for HCDP.

Hydrocarbon Dew Point (HCDP) in natural gas processing is a key quality parameter and a critical consideration for pipeline operations. In the present paper, a comparison between equations of state approaches is presented by estimating HCDP in rich natural gas using different approaches, i.e. PR, SRK or GERG-2004 EoS. Further, a parameter comparison is performed discussing the impact on the accuracy of estimating HCDP in natural gas using the selected approaches. The following parameters are compared: binary interaction coefficients, C7+ characterization methods, critical properties for single-carbon number groups and mixing rules. A set of considerations is presented in order to guide users to choose the most accurate right method for calculating HCDP in natural gas.