I ask the question because I have a BOC account for my welding gear.
I have no need for oxygen for aviation but wondered if perhaps I might be of some use to those that do.
My O2 cylinder is also on a BOC welding gas account. It is the same gas as any other O2. Only the paperwork differs.
Correct me if I am wrong from those who know more [and it may be tosh], but I was told that aviation oxygen had a guaranteed very low moisture content, so that the moisture would not become water then freeze and block narrow pipes in cold (-50C) conditions, and that not the same requirement applies for welding O2.
Correct me if I am wrong
Oxygen is oxygen is oxygen
These are the specifications:
The specifications are also different in what is allowed to be in the 0.5%.
In practice, all oxygen is produced using the same proces – cryogenic separation – and stored as liquid oxygen, which means there is virtually NO water present, and delivered with 99.9% or better purity, but of course water (and other stuff) can be reintroduced in the filling process.
The gas in the cylinder is actually the same. The same process is used and the % of water is miniscule, because by the time you distilled out the nitrogen, oxygen, etc, there will be no water whatsoever left other than contamination in the metalwork.