On Sat, 3 Apr 2004, Brandon Fosdick wrote:
> > http://www.gmcscuba.com/engineering_nitrox.htm
>
> That article only discusses GOX at relatively high pressures and at
> least room temperature. If one was working with LOX, the temperature and
> pressure would be much lower. How does this effect the risk/danger of
> explosion?
The quick rule of thumb is that they're fairly similar. LOX is more
concentrated than GOX (at any reasonable pressure), but it's also colder,
and that about cancels out. Some issues are a bit less significant or a
bit more significant, but on balance the differences aren't large.
(Some of the *physical* hazards differ, but the ignition hazards and hence
the cleanliness issues are similar.)
> I'm surprised to see that they claim adiabatic compression to be the
> source of GOX-related accidents. To initiate combustion both the fuel
> and the oxidizer have to be at proper temperatures. By definition,
> adiabatic compression doesn't transfer heat outside of the gas.
However, immediately (very immediately) *after* adiabatic compression, if
you have hot gas in contact with cold fuel, at least a surface layer of
the fuel is likely to become hot fuel momentarily. Being the cause/source
doesn't mean it's the whole story.
Henry Spencer
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