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A.APPLEYARD@fs*.mt*.um*.ac*.uk* asks:

<And, more seriously, <is> there any de-facto difference between
industrial
and>
<medical oxygen, except the price? I have heard more than once that both
come>
<from the same big storage tank at British Oxygen Ltd or wherever.>

Here in Michigan, our local gas supplier tells me that medical and industrial
oxygen all comes from the same big tank. However, I am not sure the bottles
used to distribute the gas are treated the same.  When returned for
refilling, I don't think the industrial bottles are drained or their contents
tested for purity, so there's a chance that fuel gas or other contaminants
could have been introduced due to faulty equipment at the user's site.  When
you buy medical O2, you get pure O2; if you buy industrial o2, you _probably_
are getting clean O2, but do you want to take a chance on breathing even a
small percentage of acetylene, propane, or who-knows-what other gas at
elevated pressure?

Take care
Dan

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