[filmscanners] Re: CO2

["Karl Schulmeisters" <karlsch@earthlink.net>]

Compressed CO2 gas is precipitated out of the surrounding air - as is
Nitrogen, Neon  etc.  So the CO2 gas cylinder you use has a zero-sum impact
on the environment.

CO2 has some significant benefits over Nitrogen - not the least of which is
price.
CO2 is much more compressible, so for an equivilent volume of gas, you don't
need as big or hefty a tank.
CO2 typically is stored at lower pressures (for the above reasons) - which
means that the valves etc are less expensive
Lower pressures also mean less of a thermal drop when you spray.

I would use CO2 over Nitrogen if Ididn't use a compressor.  What I have is a
tool compressor that has a large accumulator tank upstream of the
compressor.  This has a variety of advantages over the standard compressor
approach:

1) the compressor has a moisture trap - because you don't want moist air
rotting out your accumulator
2) the accumulator acts as a settling tank for any 'stuff' that is still in
the air
3) Its much quieter over the extended period, since the compressor only runs
for a minute or two every 1/2 hour or so.
4) Since its automatic, I have the compressor set up outside the workspace,
and plumbed into the workspace via self-coiling airhose.


----- Original Message -----
From: "Don Doucette" <camera911@cogeco.ca>
To: <karlsch@earthlink.net>
Sent: Friday, January 24, 2003 2:52 AM
Subject: [filmscanners] Re: CO2


AND let us not forget that Nitrogen also absorbs moisture and is NOT a
greenhouse gas, which is to say that its ODP is ZERO.
(ODP = Ozone Depletion Potential)



At 12:36 AM 1/24/2003 -0800, you wrote:
>Is there any reason that using CO2 is superior to using compressed Nitrogen
>cylinders?
>
>Nitrogen is an inert substance and is a major component of air (about 80%).
>
>---
>Jerry M. Pine
>San Jose, CA
>
>Photographs are made, not taken.


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