The cracked gas compressor is critical for cooling down the hot gases in an ethylene plant. Any corrosion issue in this area will potentially stop the production of the entire plant. Corrosion monitoring helps raise alarms immediately when the rate of corrosion is too high, to avoid an outage. Corrosion data is also useful to then look back and understand what conditions influenced corrosion when they were high, for more informed decision making in the future.