REFLECTOR: Oxygen systems

[Scott Derrick]

It's good until the pressure drops to zero!

KMis178813 at aol.com wrote:
> Since we are on the O2 discussion I have a question. Does the O2 get old
> if stored for a extended period of time? As I recall SCUBA tank air does
> get stale, what happens to it I don't know. If O2 does get stale, how
> long before one would not use it anymore? I did fill the tank at a
> establishment that supplied aviation, welding, and medical. It all came
> out of the same hose the price was the only difference.
>     Ken
>  
> In a message dated 2/14/2009 8:11:11 P.M. Eastern Standard Time,
> scott at tnstaafl.net writes:
> 
>     I fill mine from a K bottle in the hanger.  Its welding grade, and the
>     shop doesn't care what I use it for, though if they did care I would lie
>     and say it was for welding.
> 
>     There is no water in welding, aviation, or medical grade oxygen. None
>     what so ever. It is extremely dry and made so.  Thats an OWT.
> 
>     The only difference between welding and aviation/medical grade oxygen is
>     the refill process require the aviation/medical bottle to be purged to
>     some level of vacuum for some period of time before filling with the
>     same oxygen gas as used in all of them.
> 
>     There are also special handling rules for medical/aviation grade
>     bottles.  The shop I get mine from has stopped carrying medical/aviation
>     grade bottles because he doesn't  want to conform to the new handling
>     requirements.
> 
>     Scott
> 
>     Kent Murley wrote:
>     > Dennis -
>     >
>     > My experience is with the Mountain High system. I think they have an 
>     > updated version but even my original version EDS On Demand pulse 
>     > system works great.
>     >
>     > I got a mask and cannula for each EDS but you really don't need the 
>     > mask until above 18K. I usually fly under 14K feet where it's warmer 
>     > anyway. The cannulae work fine though an extra foot of tubing
>     would be 
>     > nice between me and the tank hanging on the back of the front 
>     > passenger seat.
>     >
>     > I $plurged and bought the lightweight 22 cubic foot Kevlar wrapped 
>     > tank and think it was well worth it. With the EDS it lasts many
>     trips 
>     > for 1 or 2 people but if you haul 3 or 4 people all the time it
>     might 
>     > only last one long trip. Everyone is amazed at how light weight it is.
>     >
>     > I set my EDS to turn on as I climb through 5K feet. The pulses are 
>     > very short that low. Up at 14K the pulses are still less than half a 
>     > second while your total inhale is about 2-3 seconds. That saves so 
>     > much air.
>     >
>     > Aviation O2 and welding O2 is the same but its almost impossible to 
>     > get a welding shop to fill your tank because they've been warned
>     about 
>     > liability issues in the past from aviators and divers. Just don't
>     use 
>     > medical grade O2 because that has water vapor added to it (to keep 
>     > patient's lungs moist) and water vapor at altitude could freeze your 
>     > regulator.
>     >
>     > Kent
>     >
>     >
>     > On Feb 14, 2009, at 2:03 PM, Dennis Martin wrote:
>     >
>     >> Flying at altitudes here in the Utah Rockies, I'm considering all 
>     >> the brands of oxygen systems. Aerox has the glow meter, Mountain 
>     >> High has "Pulse Demand," etc. etc. etc. Delta Air King offers a lot 
>     >> of capacity for less money than other systems. I've never flown
>     with 
>     >> oxygen, so any opinions on which systems you like would be 
>     >> appreciated.
>     >>
>     >> Thanks in advance.
>     >>
>     >> Dennis Martin
>     >> Chevy Powered 173 FG Elite
>     >
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