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In your message dated Wednesday 12, April 1995 you wrote :
> From: ddrake01
> I'm going to touch on a sore spot, but here goes. For those of you that do O2
> clean your equipment, I have a question. Often one is out on the bayou, far,
> far away in your Xwing Star Wars fighter exploring an underwater habitat.
>
> It such case, finding a compressor, much less an O2 capatible compressor is
> just not going to happen unless its in your truck/trailer. If one brought
> one's own O2 and needed to fill Nitrox to get your desired decompression time,
> would the following senario work for mixing in a tank that is or isn't clean.
>
> A shop that I've visited fills w/o cleaning and with an hydrocarbon
lubricanted
> compressor. They claim that you can fill safely as long as you fill
> very, very slowly. The reasoning is that if you use the O2 clean valve to
> throttle the O2 and keep the flow very small, that ignition temps won't be
> reached. The same goes for the "well filtered" air that comes from their
> compressor. A fill for a set of double 120s may take a couple of hours, but
> you can do this with your own tank of O2 in the field and either a compressor
> or your own set of tanks/banks.
>
> If you feel that this has any merit in INCREASING the safety of filling
"dirty"
> tanks, please reply. I'm most interested in the opinions of those who have
> pumped a cubic mile and have seen some accidents. Anyone who has other safety
> minded improvements for using "dirty" tanks and oily air please let me know.
>
> Thanks
>
> DAVID DRAKE AHDNN1A.DDRAKE01@ED*.CO*
> ROMULUS, MICHIGAN EDS/GM POWERTRAIN 8-375-5467 (GM NET)
>
Dave,
The problem is not just the speed of O2 decant. Agreed, with slow
fill rates the adiabetic compression
is low, but the potentia danger lies in using std HP air compressor. Over a
period of time contaminant build
up will start to become an issue in an O2 clean system. We always double
filter. This is not so difficult in the
field, since portable additinal filters are readily available to supplement the
one fitted to any compressor
you are using. As far as safety improvements for using dirty tanks and oily air
- don't use either!.
Oxygen cleaning is neither expensive or particularly time consuming and oily
air is not much use for anything.
Anb additional filter is the best safeguard for maintaining the cleanliness of
your cylinders coupled to a good
filling 'discipline'.
Regards
Chris
---------------------------------------------------------------------------
Chris Hellas
UK Deep wreck Diving Team
EMail:- chris@de*.de*.co*.uk* |
10422,2334@co*.co*
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