I am going to use hot oil for heating a process in a jacketed vessel and I am going to make a control loop for controlling the vessel content. The hot oil enters at the bottom of the jacket and exits from the top. The control elements are RTD, controller, and control valve. My question: Where should I install the control valve on the hot oil line? Is it up stream or down stream of the vessel?
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Re: Where should I install the control valve on the hot oil line?
26 April 2011 at 1:29pmThis is not a control issue -- the control performance is the same with the valve on the jacket inlet or on the jacket outlet. Process considerations usually favor installing the valve on the jacket outlet. The pressure within the jacket is higher, and a cooler fluid is subjected to the pressure decrease across the control valve. There could be some special process considerations in your application that favor installing the valve on the jacket inlet. Probably not, but if so, then do it.
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