Countermeasures for Packing Corrosion in Refinery Pressure Reducing Units

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This post was last edited by Wang Wei2 on 2025-9-5 at 10:29. 1. Based on the results of fixed-point thickness measurements and the corrosion issues that occurred earlier, the pipelines and fittings that have suffered severe thinning due to corrosion were replaced. 2. Plate lining was applied to the wall sections of columns 6 and 7 in vacuum distillation column C104, with the material being upgraded from the original 316L composite plate to 317L; the damaged packing in columns 6 and 7 was replaced. 3. Monitor the corrosion of the vacuum tower on a monthly basis using a hydrogen flux meter. High-temperature naphthenic acid corrosion generates active hydrogen, some of which penetrates through the metal pipe wall into the external environment. A hydrogen flux meter can detect the hydrogen that has penetrated; the higher the hydrogen flux value, the more severe the corrosion. 4. Strictly control the pH value of the normal roof and reduced roof wastewater between 6 and 8. Based on online corrosion monitoring and laboratory data analysis, the pH value of the overhead and reduced overhead wastewater is monitored and adjusted in a timely manner.