Originally Posted by
joepilot
If you are filling something with a gas by pumping it in with a compressor that will heat it up, but when you fill an O2 bottle from a higher pressure bottle, the O2 coming in will be expanding and cooling off.
For those who questioned the bottle construction, the Australian safety report says it was one piece steel. See the link in Posrates post, page 16.
Joe
Actually it's the other way around. I don't know the physics behind it but as a former MX guy we used explosion proof cages to fill new crew O2 bottles. Believe me, they were warm after filling from 0 psi.