The serious corrosion problem at low temperature could be found in atmospheric-vacuum distillation unit, especially in the atmosphere overheadcondenser.
常减压装置存在较为严重的低温位腐蚀问题，尤其是常压塔顶冷凝器腐蚀问题更为严重。
2
The system comprises a low pressure rectifying tower, a pressurizing rectifying tower, a tower kettle reboiler, an overheadcondenser and an auxiliary condenser;
包括低压精馏塔、加压精 馏塔、塔釜再沸器、塔顶冷凝器和辅助冷凝器；
3
The causes of corrosion cracking failure of the overheadcondenser tubes after operated less than 6 months were analyzed. The content of halogen in the oil was the main reason of leakage.