Sure, but liquids and gases are routinely handled in vessels with a maintenance interval of "never" on the inside, I'm not so sure that could be transferred to

Sure, but liquids and gases are routinely handled in vessels with a maintenance interval of "never" on the inside, I'm not so sure that could be transferred to a powder. But this might be my lack of knowledge of existing processes in "powdery industries" speaking, if those are solved problems there I would not know. Your mention of gasoline evaporating made me realize that some of the iron oxidating is probably not all that bad, just make sure that there's no ventilation continuously swapping in fresh air. I guess I'm looking forward to the next iron age!