[R-390] Cosmos Dis-assembly

[rbethman]

Russ,

While they originally used dry nitrogen, you "may" want to consider 
Argon, available at welding shops.

Why the change?  Argon is much less reactive than Nitrogen, and most 
likely easier to obtain.  Either of these gases is normally supplied in 
300 cubic foot cylinders, and comes pressurized at about 2700 - 3000 psi.

(I used to do welding and am a Scuba Diver.  Used to large volume high 
pressure gases.  Scuba tanks get filled from a bank of these large 
cylinders while placed in a plastic container of water.  Just in case 
the tank lets go! )

Bob - N0DGN

On 4/19/2010 12:38 PM, wa3frp at aol.com wrote:
> Hi Roy,
> Yes, my Cosmos PTO did have a schrader valve.  In my case, it can be seen at the back of the Cosmos
> once the outer case has been removed. I assumed that they were all made that way. I'm thinking that I will
> try to repressurize the unit if I can find a source of dry nitrogen in the area.  My first thought is to approach
> the Chemistry Department of a local University.
> 73 Russ WA3FRP