October 2004

Special Report: Improving Process Control

New level control techniques

Target flow nonlinear control and target opening nonlinear control offer advantages in some applications

Mandal, K. K., Indian Oil Corp. Ltd.

Good surge vessel and column level control are keys to stable process operation. Plant performance can be further improved by incorporating the best suitable level control techniques. Process flow and level interact; if one varies, the other has to vary. One of the important objectives of advanced process control (APC) systems is to stabilize flow at the cost of level fluctuation. Different types of level control techniques and their selection are discussed in detail with an example. Direct level control (LC control). Here, normally flow measurements are not provided to avoid unnecessary cost for flow indication or an unnecessary extra flange that may be hazardous for plant operation d

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