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What is preferred elevation of hydrogen gas transmission pipeline?

Question asked by daniel.lewis on Jan 3, 2019

A hydrogen gas transmission pipeline (~300 psi) will be constructed just outside my factory fenceline in China, along the plant entrance road .  Is it safer for this line to be installed underground or above ground, considering risk of corrosion vs risk of impact by vehicles?  (would have appropriate protections in either case)  If above ground, do I need to provide specific separation distance# from a parallel steam supply line?