Orifice Design Calculator will size a gas/liquid orifice plate using ISO5167 (2003) International standard and Crane's Flow of Fluids through Valves equation 3.22, Fittings and Pipes, calculate the mass flow rate require for a certain orifice size and plot a profile chart of various mass flow rates vs orifice size. The software can be used to size restriction orifices / square edge orifices. Generate a Ms Excel based Engineering data sheet of results or print a summary....etc.