Control valves and process variability
A theoretical analysis is developed to explain some experimental results for a flow loop from the literature. Process variability is shown to be dependent on the disturbance or noise parameters, the closed loop time constant, the loop dead time and the control valve dead band. The results can be extended to other process variables.
Wilton
SR
Syncrude Canada Ltd., Fort McMurray, Alberta. wilton.stephen@syncrude.com