If you have not yet determined the orifice size then to estimate this we would suggest that you temporarily use a Flow Control Valve in your system to control the flow rate in the pipe (to whatever flow rate you require). You can represent an orifice in a Pipe Flow Expert system by using a Fitting with a specific K factor if you know the K factor that represents the flow versus pressure loss performance of your orifice. Using a K Factor to model performance of an Orifice The following notes explain how to model and size an orifice. You can however model an orifice by using a Fitting with the appropriate K factor or by using a Component with defined flow versus pressure loss performance. The Pipe Flow Expert software does not currently contain a specific orifice component.
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