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Discussing the corrosion and protection of gas transmission pipelines

2019-09-16View Original

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Corrosion and protection of gas transmission pipelines: The main component of natural gas is CH4, with small amounts of C2H6, C4H10, CO2, CO, H2S, etc. Additionally, water vapor is present during the transportation of natural gas; a decrease in the temperature and pressure of the flowing medium can cause this water vapor to liquefy, and it can combine with CO and H2S to form acids that corrode the pipelines. Electrochemical corrosion is also an important factor in the corrosion of gas transmission pipelines. Steel suffers pitting corrosion in both gas and liquid environments, and sulfide stress corrosion also occurs in natural gas media containing humid H2S. The flow rate, temperature, and pressure of the gas also affect the corrosion rate of the pipeline.

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