Which risk increases when a natural gas pipeline experiences external corrosion under insulation?

💡 Explanation

When a pipeline corrodes under insulation, atomic hydrogen is produced by the corrosion reaction and diffuses into the steel, causing hydrogen embrittlement, which reduces ductility and increases susceptibility to brittle fracture. Therefore, brittle fracture risk increases, rather than creep, galvanic corrosion, or erosion, which are related to different degradation processes.

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