MSC. EASY5 Governing Equations · Conservation of mass Conservation of Energy Conservation of momentum Flow/Pressure Drop Correlations for Pipes and Orifices Pipe Friction Factors as a Function of Reynolds Number Modeling and Simulation of Gas Systems with MSC EASY5 - Chart 12 MSC XSOFTWAREMSC.EASY5  Modeling and Simulation of Gas Systems with MSC.EASY5 - Chart 12 Governing Equations • Conservation of Mass • Conservation of Energy • Conservation of Momentum • Flow/Pressure Drop Correlations for Pipes and Orifices • Pipe Friction Factors as a Function of Reynolds Number