This calculation uses the Murdock Wet Gas Correlation to compensate for quantities of liquid in a gas stream for orifice plate and Venturi meters. The mass flow rate is corrected with the Dickinson Jamieson correction, which uses the Murdock variable of 1.5 for an orifice plate and 1.26 for a Venturi.

References
High Accuracy Wet Gas Metering, P.F. Dickinson A.W. Jamieson, Shell UK Exploration and Production, 1993 Flow Measurement Workshop.