After the air separation equipment stops, when the equipment does not discharge liquid, the basic temperature of the cold box will be reduced to more than - 100C in many cases. Most air separation plant users customers concern about this situation which will lead to a illusion of equipment leakage for the sake of safety.If the base temperature of cold box is reduced due to equipment leakage, the leakage should be more serious when the equipment hold pressure before the system stops. f the base temperature of the system is normal before shutdown, and the base temperature of the cold box decreases to more than minus 100 degrees after shutdown, it must be caused by no heating gas after shutdown of the air separation equipment and the downward diffusion of the cold gas in the fractionator, instead of the leakage of the fractionator.This phenomenon will disappear automatically after the equipment is put into normal operation.
