May 2002

Instrumentation/Control

Optimize surge vessel control

Proportional only algorithm complements multivariable predictive control

la Grange, T. G., Honeywell Hi-Spec Solutions; Taylor, A. J., ProSys Engineering Pty Ltd.

Surge vessel level control can be key to stable process operation during significant load disturbances. A variety of level control techniques with the objective of using available surge capacity to smooth the load disturbance are reviewed. One simple and novel approach has been used in a number of advanced process control (APC) projects to complement the higher-level applications. When designing an APC solution for a process unit, improving process stability is a fundamental objective. Often significant process variability is driven by load disturbances outside of the process unit, and there is a real need to attenuate t

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