Corrosion of urban gas pipelines

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In urban gas pipelines, corrosion damage on the inner wall of the pipes is primarily caused by a combination of chemical corrosion and electrochemical corrosion, resulting in the formation of corrosion grooves, deep pits, or extensive areas of thinning on the pipe interior. Based on on-site inspections of pipeline corrosion defects and their characteristic analysis, it was found that the artificial gas pipelines in a certain city are characterized by volume-based defects, including uniform corrosion defects and localized corrosion defects in the pipe walls. In certain areas, artificial gas pipelines suffer from significant settlement; this settlement causes the pipelines to shift and deform. Additionally, there is water accumulation and internal corrosion to varying degrees in these areas. Water accumulation leads to an increase in load, while internal corrosion results in localized stress concentration and increases, directly affecting the safe operation of the pipelines.