System and method for preventing total plant shutdown due to low temperature excursion
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United States of America Patent
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-
Nov 1, 2022
Grant Date -
Aug 22, 2019
app pub date -
Apr 29, 2019
filing date -
Oct 28, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system of interlocks for controlling flow of low temperature process streams in a manufacturing process through a cold box to equipment or piping not specified for such temperatures by opening and closing valves and starting and stopping pumps. At least one interlock affects streams heated in the cold box. At least one interlock affects the streams cooled in the cold box. The interlocks are activated by temperatures of process lines to prevent exposure of equipment and piping to low temperatures while preventing the shutdown of the cold box. An override controller including a predictive failure capability is also provided.
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