Analysis of the causes of corrosion and perforation in condenser tubes

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Our company has feedstock for a distillation tower, which includes hydrogen chloride gas, trace amounts of hydrogen fluoride, and chlorine gas. The chlorine and hydrogen chloride coming out of the top of the tower are cooled in a brine condenser. After just a few weeks of use, the cold end of the condenser tubes (saline inlet) was corroded and damaged on the process side. It turned out that the inlet gas to the distillation tower contained trace amounts of water (a few ppm), which were not detected by the instruments at that time. The coexistence of chlorine gas, hydrogen chloride gas, and water vapor raises the dew point (due to the presence of these gases); water condenses at the lowest temperature points in the pipes, forming a highly corrosive substance that causes corrosion and perforation of the condenser pipes.