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Re: Running a compressor continuously


From: 	DamDeName-at-aol-dot-com[SMTP:DamDeName-at-aol-dot-com]
Sent: 	Friday, November 07, 1997 12:46 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Running a compressor continuously

Hi Aric,
   I'm considering the pump to be a sealed refer. unit ---
In refer. applications the return line serves to cool 
the unit --- in vacuum apps. there is no recirculating 
fluid to pump out the heat--- plus the fact that the unit
is operating in a bit of an isothermal environment
due to the vacuum -- allowing only radiation as the 
heat transfer mechanism--- (plus oil vapor as a thermal conductor) 
     I am not familliar with the vacuum oil you describe
----- aat these temperatures and pressures there may be 
backstreaming of the oil --- which is to say oil vapor 
getting into the lo pressure area --- if so it will contaminate 
your cap.--- 
     Also---- the comp. is designed to pump / recirculate 
the oil ---- unchecked it will pump the oil out of the     
compressor --- monitor the exhaust for oil ---
      A cold trap (dry ice and acetone) between the cap
and compressor handle any back streaming problems . 
      A blower on the compressor will help to limit 
the temp. rise .
     
regards ,
              Sandy

In a message dated 97-11-07 08:39:26 EST, you write:

<< Subj:	 Running a compressor continuously
 Date:	97-11-07 08:39:26 EST
 From:	tesla-at-pupman-dot-com (Tesla List)
 To:	tesla-at-poodle.pupman-dot-com ('Tesla List')
 
 
 From: 	Aric C Rothman[SMTP:Aric_C_Rothman-at-email.whirlpool-dot-com]
 Sent: 	Thursday, November 06, 1997 9:33 AM
 To: 	Tesla List
 Subject: 	Running a compressor continuously
 
      I am trying to vacuum desiccate my polyethylene-paper-foil capacitor 
      with a used piston compressor pump.  I attached a gauge to the vacuum 
      side and it was pulling 26.5 in. of mercury.  After about 2 hours of 
      noncontinuous operation, I measured a drop in capacitance from 0.01 uF 
      to 0.009 uF, which I attribute to dehydration, so things appear to be 
      on track.  I'd like to know if it is safe to run the compressor 
      continuously in this state (26.5 in Hg).  After about 1/2 hour, the 
      compressor gets too hot to lay hands on for more than 5 seconds.  
      After another 1/2 hour, there is no further noticeable increase in 
      compressor housing temperature.
      
      I just ran about 1/2 qt. of Mobil vacuum oil into the pump.  Can I 
      leave this thing running all day?  Eight hours?
      
      Aric