InstruCalc calculates the sizes of control valves, flow elements, and relief devices; produces data sheets for calculated items; and prepares instrument summaries and uses data sheets as a database for generating reports. The Control valve and Flow element modules calculate, display and print graphs of your calculations. InstruCalc allows you to select any set of engineering units, including your own customized set. Units can be mixed, matched and changed in the middle of a calculation. InstruCalc calculates process data at flow conditions for 54 fluids in either mixtures or single components and 66 gases in either mixtures or single components. Files can be updated with additional users' fluids and gases.