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On Thu, 25 Aug 1994, Harry Railing wrote:
> Over here it is normal to fill with He first, then add O2 and then top off
> with air. (He is added first because it is the most expensive). In this
> scenario, pure O2 is passed through the pillar valve and therefore I suggest
> that the tank and valve are in O2 service even though the end result might
> be that there is less than FO2 40% once the He and O2 have mixed.


Have to agree with ya here.. with experience dictating my reply..

in the begining there were a few of us that were passing o2 thru the
valves in this manor without o2 servicing (not cleaned or no viton
o rings), after we had the training we complied, but forgot about
a couple of tanks in the madness...  there were definite signs of
degeneration on o rings upon later inspections *and* some minor
leaks showed up in some valve knobs...

aloha,

dennis

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