The work aims to solve the severe corrosion on the liquid phase outlet pipeline flange for a separator of a gas field in the western region.An analysis was conducted to ascertain the causes of the flange corrosion.This analysis involved macroscopic morphology observation,non-destructive testing,chemical composition analysis,metallographic structure analysis,mechanical performance testing,microscopic morphology observation of the corrosion area,phase analysis of corrosion prod-ucts,and corrosion electrochemical experiments.The findings suggested that the A105 flange and the 316L sealing ring materi-als were highly susceptible to galvanic corrosion.In conclusion,galvanic corrosion is the primary contributor to the severe cor-rosion observed on the flange surface.Moreover,inadequate venting of the liquid phase pipeline prior to shutdown also leads to liquid accumulation at the flange base,resulting in compounded waterline corrosion at the gas-liquid interface.Based on the identified causes of flange corrosion,specific anti-corrosion recommendations are proposed.
关键词
气田/分离器/法兰/电偶腐蚀/电流密度/电化学
Key words
gas field/separator/flange/galvanic corrosion/current density/electrochemistry
维普
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