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