The serious corrosion problem at low temperature could be found in atmospheric-vacuum distillation unit, especially in the atmosphere overhead condenser.
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。
The corrosion prevention played a vital role in ensuring the long-term operation of the atmospheric-vacuum distillation unit.
常减压装置的防腐蚀工作对于其长周期运行极为重要。
The application of two corrosion inhibitors i. e. 7019 and SF-121B in the overheads of three towers of atmospheric-vacuum distillation unit was summarized and the economic performances were analyzed.
总结了7019和SF - 121 B两种缓蚀剂在常减压三塔顶的应用情况，并进行了经济技术指标分析。
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