August 2007

Special Report: Fluid Flow and Rotating Equipment

Visualize pump and control valve interaction easily

Use these steps to set up a spreadsheet to visualize the system behavior

Unnkikrishnan, G., Kuwait Oil Co.

Control valves are the final control elements of a process control system and play the key role of controlling the process variables within the safe operational envelope. It is the dynamic element in the system that translates the control system logic to mechanical action. The fact is that little attention is usually paid to this aspect while designing the process plant. During the typical project design stage for a pump and control system, the process design engineers usually assign a certain pressure drop for the control valve and develop the pump discharge pressures in a pumping circuit. Instrument design engineers select a suitable control valve based on the process data furnished by the

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