[William McKinley]

Look friend, you obviously don't understand chemistry enough to understand that you don't understand.

I worked in a hydrogen processing plant. I know.

Hydrogen permeates everything.

If you have hydrogen in a vessel, the small hydrogen molecules will start penetrating the vessel walls. Eventually, they will saturate the vessel walls.

Do some reading on hydrogen embrittlement and hydrogen attack.

[Lee'sGhost]

"I worked in a hydrogen processing plant. I know."

You worked in hydrogen plant and didn't even make a D in chemistry. That's pretty good!

[itsahoot]

Do some reading on hydrogen embrittlement

Bingo, the plating industry deals with this problem by low temperature heat treating. Chromed springs are a biggie.