RO-4201 sizing Project . Restriction Orifice Plate - Gas Flow Tag number RO-4201 Input data Fluid Normal gas flow Meter inlet pressure Discharge pressure Flow temperature Molecular weight Cp/Cv specific heat ratio Viscosity @ FTP Pipe inside diameter Density @ FTP Element material Pipe material Process gas 38840 kg/h 90 barg 0 barg 50 degC 21.67 1.613 .01549 cp 2.9 in 90.86 kg/m3 Carbon steel Carbon steel Output data Orifice diameter 29.55 mm Beta ratio .401696 Reynolds number 12038159 Max pressure loss 662.4 bar Max power loss 729.7 Minimum plate thickness 17.31 mm Modified Mass SI, basic calculation, calculate size Source - The Flow Measurement Engineering Handbook. Third Edition. InstruCalc Ver.9.0.3. Notes 8/28/2021