October 2004

Special Report: Improving Process Control

Understand control benefits estimates

Here's how the five popular methods work

Martin, G., Emerson Process Management

Five methods for estimating control function benefits using before-control data were previously presented.1 Three of the methods are based on statistics, and shifting the average of a controlled variable distribution in the profitable direction. The fourth method is based on curvature of the profit function, and the benefit calculated is independent of the location of the average. The fifth method disregards the distribution and simply shifts the average to a point that has been achieved by a significant percentage of the before-control data. While reference 1 provided derivations, equations and examples, it never made clear by illustration the rationale for the shift in the average, d

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