Working of an Override Control  

Introduction The override control concept is a technique by which process variables are kept with in certain limits, usually for     protective purposes. Override control maintains the process in operation but within and under safer conditions.   Override control To illustrate override control, consider the simple process shown in Figure A hot, saturated liquid enters a process surge tank, and then it is then pumped into the process. Normally, the tank operates at the level shown, but if the level gets too low the liquid will not have enough net …

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