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We have a SR type CRU. During recent shut down, catalyst regeneration was carried out. During reduction, welding leak was observed at air cooler outlet, upstream of caustic injection. Caustic injection point is at downstream of air fan cooler. Would caustic injection upstream of air fan cooler help where temperature used to be 100 deg C?
 
Answers
25/04/2011 A: Virendra Kapoor, Petroleum Refining Consultants, vkkapoor9@yahoo.com
Check the dew point of the water vapor at the regeneration pressure. I presume it may be about 150- 160 degree C at pressure of regeneration.
In presence of the condensed water, the hydrogen chloride present in the circulating gas becomes highly corrosive and cause damage to the metallurgy.
So to prevent that damage preventive action is needed.