Analysis and Characteristics of Equipment Corrosion in De-carbon Dioxide System at Dongfang Terminal

The morphology of corrosion in the de-carbon dioxide equipment at Dongfang Terminal was identified by the observation method. The corrosion causes were analyzed. Three typies of corrosion inclucling pitting corrosion grooving corrosion on the welding line and crevice corrosion occured at the place with the geometric discontinuity of the pipeline. The condensate liquid film, CO2 and Cl- were the main causes of the corrosion. The corrosion of cooling water equipment at Dongfang Terminal can be classified as oxygen absorption corrosion and bubble cavitation formed on the impeller blade surface of a centrifugal pump. Measures for controlling the corrosion on de-carbon dioxide facilities were proposed.