How would you convince someone to install advanced process control(APC)on a coker unit? Such discussions involve not only dollar figures but also one's own conviction. The arguments in favor of APC are known:Use of a complex relationship between controlled variables (CVs)and manipulated variables(MVs)in qualitative and quan titative ways; Prediction capability of two to three hours;Optimization potential;Reduced standard deviation permits operating closer to the limits.
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