Which outcome occurs when high partial pressure hydrogen gas permeates through a steel pipeline?

💡 Explanation

When subjected to high hydrogen partial pressure, atomic hydrogen diffuses into the steel's lattice structure, causing hydrogen embrittlement because these atoms weaken the metallic bonds by forming hydrides at grain boundaries and dislocations, this decreases the toughness, and causes fracture. Therefore pipeline fracture arises, rather than oxidation, increased flow, or phase separation, which involve different thermodynamic and chemical processes.

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