[TheForge] Refrigerator compressor/motors

[GHS]

Dave Brown wrote:

> 
> Why?  Or should I ask how? 

  No heat,
Other than the motor and the ever present possibility of spark 
generation. Ever lay your hand on a compressor that was not being cooled 
by a flood of refrigerant?

  no oxygen,
I am assuming this would not be a permanent rig. As you would be 
connecting and reconnecting this, and it would not as a whole be 
permanently flooded, I would not be so sure about no oxygen.

  propane will liquefy
> under pressure, compressor is already designed for compressing a gas 
> (freon) to liquid state at pressures comparable to propane.

Propane was once used in this country as a refrigerant. Still is in some 
places. I believe it was belt driven compressors, no windings in the gas 
flow.

Ammonia was used also.

The problems with these were LP could explode and pure ammonia kills you 
outright.

The Freon type refrigerants were designed around finding a non explosive 
(essentially non flammable) non poisonous substitute. Keep in mind that 
given sufficient heat you can burn Freon into phosphoric acid and 
phosgene. This the reason that being careful with the gases and oils 
from a burnt out compressor is a GOOD idea. Freon also will not support 
life if there are sufficient quantities.

Even with that it is still much safer given the original concerns.

While IN THEORY you are correct. Positing a totally oxygen free 
environment and a perfectly running compressor, you probably could get 
it to work , it is the wrong compressor for the job.

I have not had an opportunity to check the pressure temperature curves 
for LP but at normal atmospheric temps you might have a problem 
generating sufficient pressure to liquefy the LP.

> I'm not trying to be a smartass, Mike.  I was just looking for answers 
> longer than one word or that had a positive bent to them.

Dave not blowing you into little pieces and launching your shop into the 
bay IS a positive bent , from my perspective.

> Dave Brown
> Heritage Smithing
> Green Bay, WI
> 
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