Corrosion of the inner and outer walls of the tube bundle in the atmospheric and vacuum distillation pre-condensers in the petrochemical industry

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The image below shows the tube bundle of the atmospheric and vacuum distillation pre-condenser in petrochemical industries. The model is FLB1200-395-16-4, and the tube bundle material is 10# steel. The operating condition is that the tube side contains deep well water, while the shell side contains oil, steam, and water vapor ； Operating temperature: 23 degrees for the tube side and 55 degrees for the shell side ； The pressure in the tube side is 0.2 MPa, while the shell side is under negative pressure. This tube bundle has been in use for nearly 2 years, and both the oil and gas in the shell side as well as the deep well water have caused significant corrosion to the inner and outer walls of the tube bundle. This type of corrosion belongs to the H2S-ClH-H2O system corrosion on the oil and gas side, while on the circulating water side it is electrochemical corrosion of water. It is recommended to apply a coating on the inner and outer walls of such tubes to prevent corrosion, which can solve this problem.