O2 filling

"Dan" wrote

BTW, US Airweld in the Phoenix area will fill tanks (not just exchange
them), which was a bit hard to find.

Around here, it isn't hard to find someone to fill your own bottle, but you
will have to wait a few days for it.
--
Jim in NC

Tina wrote:
Thomas, I would think some vendor, probably local, is either buying or
generating oxygen, and compressing it.

Commercial oxygen is genereted by cryogenic separation which involves
compressing it to levels so high that the atmospheric differences are
completely lost.

Anyone go to jail for this?- Hide quoted text -

I don't know. Here is a write-up by Peter Garrison (Flying magazine):
http://stage.flyingmag.com/article.a...ection_id= 19

Gerd

In article ,
says...


On Nov 15, 10:05 pm, Airbus wrote:
A bit O.T. :
I read an accident report a few years back - an FBO in Europe re-filled an
O2 bottle with compressed air. In the ensuing high-altitude flight, the
pilot lost conciousness and the airplane crashed in the mountains. A
passenger, miraculously, survived and confirmed the cause of the crash due
to the pilot's unconciousness.

What I've wondered ever since I read it :
What would the FBO be doing with compressed air in the first place, and how
could this confusion occur? What *could* they have been thinking?

I think you mean this one: NTSB IAD97FA060
http://www.ntsb.gov/ntsb/brief.asp?e...08X07722&key=1 . It
was a T337 and happened in the US.

Gerd


That is it - thanks.
Don't know why I had it situated in Europe. Was I just "hoping" it couldn't
happen in the US?

Anyone go to jail for this?

If you refill at an airport, they usually pull a cart up to the airplane
with a series of oxygen bottles manifold.

The begin filling slowly, so as not to generate too much heat that will
raise the pressure. They start with the lowest pressure tank on their cart
and fill until flow stops. Then they close the valve on that tank and open
the valve on the next higher pressure tank, until the pressure has reached
the same as the source tank.

The source tank cools as compressed gas comes out and the aircraft tank get
hotter as gas goes in. That means the tank will read 2300 ponds when it is
full and an hour later it will be at 2000 when it is cooler and a cruise
altitude in the cold, the tank will be down to 1800 PSI. If the tank can be
refilled out of the airplane, it can and should be placed in a tank of cold
water to speed the refill process and efficiency and to provide protection
if it blows up during the filling.


An generator produces low pressure gas which can be accumulated and
breathed. Your lungs would rupture if you tried to breathe high pressure,
more than a pound above the outside air pressure at your altitude.

Over-pressure breathing is measured in "inches of water" and a foot of water
is only a 1/2 pound.



"gwengler" wrote in message
...

Anyone go to jail for this?- Hide quoted text -

I don't know. Here is a write-up by Peter Garrison (Flying magazine):
http://stage.flyingmag.com/article.a...ection_id= 19

Gerd

On Mon, 19 Nov 2007, Dan wrote:

What adaptor do you use for the transfilling? Do you have a welding
bottle(s) that you exchange? Most of the transfilling adaptors I've
seen are more than $100.

I got one from this guy: http://search.ebay.com/_W0QQsassZjohnclairowens
I got an extra yoke end so I can connect any combination of welding or
medical cylinders.

Also have another one I found used for a lot cheaper.

I don't have my own welding cylinder, I fill from a friend's. If I used
more I'd get my own cylinder.

-Dan