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N2 is great for purging refrigeration systems, and coming out of a tank it will be dry (no H2O to speak of). At low temperatures it is relatively inert, but the way I think of it is that nitrides nitrates and all that stuff tend to happen at higher temperatures.
For purging a gas tank or a refrigeration system it is the nuts, but I would only reluctantly use it on SS as a back purge.
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