Corrosion condition of the inner wall surface of the atmospheric pressure oil transfer line in petrochemical units undergoing vacuum and atmospheric pressure distillation
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Atmospheric transfer line – refers to the pipeline that transports process materials from an atmospheric furnace (abbreviated as atmospheric furnace) to an atmospheric distillation column (abbreviated as atmospheric column). The atmospheric pressure oil transfer line consists of a main pipe section, a branch section, a transition section, and end furnace tubes. The image below shows the corrosion on the inner wall of the main pipeline at atmospheric pressure, with the oil transfer line temperature being around 300°C.
The inner wall of the atmospheric pressure oil transfer line is prone to corrosion in high-temperature environments, mainly because the material being transported may contain highly corrosive chemical components such as sulfides and moisture. When operating for long periods under high-temperature conditions, these corrosive substances accelerate the damage to the inner walls of the pipes, leading to corrosion. .