[TheForge] Refrigerator compressor/motors

[Peter Fels And Phoebe Palmer]

I saw a guy transferring liquid propane between pressure bottles by 
connecting them with a common tube. He turned the full bottle upside 
down and opened the valves as well as the pressure bleed on the empty 
valve.Then shut it down when liquid started showing in the bleed stream. 
This oughta work till you hit the overfill tube on the full bottle.
Needless to say, a reasonable person wouldn't admit to having done this...

GHS wrote:

>
>
> 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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