Corrosion of trays in distillation and atmospheric/vacuum distillation columns

The practical details you shared really meet the actual needs of on-site operations! I’d like to add a few practical tips used on site: First, it is possible to combine the real-time monitoring data from online corrosion coupons and probes with analysis of pressure difference changes, which allows for earlier detection of early-stage corrosion risks ； Secondly, during shutdown for maintenance, it is important to inspect the corrosion in the feed impact zone of the tray and at the gas-liquid phase interface; these areas are often weak points where corrosion occurs frequently ； Thirdly, whether it is to adjust the corrosion inhibitor scheme or replace the anti-corrosion material, it is recommended to conduct pilot tests first before implementing the changes across the entire facility, in order to avoid causing new process fluctuations. It is recommended to take into account the actual operating conditions of the equipment and consult a professional petrochemical operation and maintenance team before implementing these suggestions.