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Thread: vacuum in a recovery cylinder?
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23-09-2007, 07:21 PM #1
vacuum in a recovery cylinder?
i hope this question isnt as dumb as it sounds, but hear goes,,,
i have a brand new recovery cylinder, and i pulled a deep vacuum in it. now im working on a sandwhich cooler and i find a leak in the service valve. i tried replacing the core and it still leaks so i set up to evacuate the system for repair.
the nameplate states that it holds 11 oz of mp39. when i go to recover the refrigerant, i end up with 1.5 oz in my recovery cylinder.
which brings me to my question...
it is my understanding that if you have a cylinder with "only" refrigerant in it, it will pressurize to the correct pressure for that refrigerant at that ambient temp. why is it that when i hook my gauges, it still reads a vacuum?
thanks a bunch,
mike
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23-09-2007, 08:25 PM #2
Re: vacuum in a recovery cylinder?
How big is the recycle cilinder?
11 oz is 311 gram, so on a cylinder that can hold say 28 kg that is not enough to brake the vacuum!Last edited by Lowrider; 23-09-2007 at 08:26 PM. Reason: calculation
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23-09-2007, 08:54 PM #3
Re: vacuum in a recovery cylinder?
You need enough refrigerant to have liquid refrigerant in the cylinder to get an acurate reading.
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23-09-2007, 09:02 PM #4
Re: vacuum in a recovery cylinder?
its a standard sized 30lb cylinder. how much refrigerant would you guess it would take to bring it up to the right pressure at 70 deg f?
thanks
mike
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23-09-2007, 09:17 PM #5
Re: vacuum in a recovery cylinder?
Much more then you have in the sandwich cooler!
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23-09-2007, 11:01 PM #6
Re: vacuum in a recovery cylinder?
How much air is in the cylinder that was in your manifold tubes?
Brian - Newton Abbot, Devon, UK
Retired March 2015
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24-09-2007, 09:38 PM #7
Re: vacuum in a recovery cylinder?
The formula to calculate the amount is:
p*V=n*R*T
p= pressure in Pa (N/m2)
V= volume in m3
n= amount of gas in mol
R= gasconstant (8,314472 Jk-1mol-1)
T= absolute Temperature in K
Let me know what you came up with!
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