Every 30-35 days the cracker furnaces have to shut down for a de-coking cycle. The schedule is determined by loss of temperature across the tubes mounted inside the furnace and yield loss of cracked gas. When the furnaces are shut down, a steam and air mixture is pumped through the furnace tubes to clean the coke that has built up on the inside of the tube walls. To determine the de-coking cycle time, operations personnel will monitor the CO2 rel

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