Gas rectification columns are process apparatuses which are very important
part of each onshore plant. Sudden failure of these types of columns causes
huge daily losses, while fluid leakage can be very dangerous for the people
and hazardous for the environment. For that reason, a regular and correct
examination of the column is of great importance for the continual process
of leading. Together with the detailed examination of the column, a
risk-based inspection was applied to maximize savings, both material, time,
and costs. The expected remaining service life of rectification columns was
also analyzed, while the corrosion rates were calculated according to the
various international standards. The minimum required column wall thickness
was calculated according to the most commonly used international standard
and the obtained difference was analyzed. Detailed analysis of the total
risks of the column due to potential failure is presented.