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In this video, weamp;#39;ll go through a step-by-step process for sizing control valves for compressible fluid using the ISA and IECamp;#39;s recommended procedure. For this example, weamp;#39;ll assume superheated steam is to be supplied to a process designed to operate at 250 psig, or 17.2 bar. The supply source is a header maintained at 500 psig, or 34.5 bar, and 500 degrees Fahrenheit, or 260 degrees Celsius. A NPS 6 or DN 150, standard schedule line from the steam main to the process is being planned. Note that a 6-inch standard schedule pipe has an inside diameter of 6.1 inches. Also, make the assumption that if the required valve size is less than NPS 6 or DN 150, it will be installed using concentric reducers. Now letamp;#39;s go through the process to determine the appropriate Fisher ED valve with a linear cage. The first step is to specify the variables required to size the valve. The desired valve design as a Class 300 globe valve with an assumed size of 4 inches and a l