I assume the needle valve will be on the mixing panel.
and the cylinders 30 ft away.  If this is the case it
is in your best interest to turn the valves on the O2
cylender on verrrrrryyyyyyy  slowwwwwwly.  Since the
needle valve is closed you effectively have a long
hose with a dead end at the mixing panel when the O2
cylinders are first turned on.  This could create a
problem area especially if the O2 cyliners are turned
on quickly when the line is depressurised.  Perfect
scenario for that adiatbatic thingy to take place.

Mat.

--- Hans Petter Roverud <proverud@on*.no*> wrote:
> At 11:14 PM 6/10/99 -0700, kurt fitch wrote:
> >
> >Can anyone offer advise on the distance the O2 bank
> needs to be from the 
> >mixing panel? Because of my shop layout, the O2
> bank as to be approx. 30ft 
> >away from the panel. But GMC state that this is
> very dangerous because of 
> >ADIABATIC COMPRESSION?
> >I look forward to your replies.
> 
> The only way distance may relate to adiabatic
> compression is how you run
> the oxygen line. The main things to avoid are
> quarter-turn valves and
> "interesting" turns and couplings. It may TEND to be
> less cleanly
> configured the longer the line gets since one may
> TEND to run the line into
> a lot of nooks and crannies, as well as piecing
> together several lengths
> and get too many couplings. Just avoid all that!
> Adiabatic compression occurs when you stop a flow of
> gas instantly, most
> easily accomplished with a quarter-turn valve. These
> valves are responsible
> for most oxygen flashes in poorly designed systems. 
> 
> regards,
> 
> Hans  
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