A model for predicting the corrosion rates in the furnace internal wall tubes of the refinery boiler was\ud resolved, using the first order differential equation derived from the material balance equation of the system.\ud The mathematical model was able to predict the metal loss recorded by ultrasonic thickness scanning technique\ud (UTS), and the results shows an agreement. The results from both the model and UTS shows that in the various\ud tubes of the furnace, internal wall of the refinery boiler were between the same range. The percentage deviation\ud which was calculated to ascertain the acceptability of the model result as compared to that from UTS proved\ud that the model is effective. The inhibitor model result show that corrosion will drastically reduce in the presence\ud of corrosion inhibitors under proper chemical treatment and management. The model developed can be used to\ud monitor furnace internal wall corrosion even when the system is in operation by extrapolating the result to\ud further years.\u
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