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Re: Blown Rolled "Hull" Capacitor Discussion

>>From chip Fri Mar  1 17:03 MST 1996
>Date: Fri, 1 Mar 1996 17:03:28 +0700
>From: chip (Chip Atkinson)
>To: tesla
>Subject: Re: Blown Rolled "Hull" Capacitor Discussion
>
>
>>>
>One of the problems that you can run into with PVC pipe and PVC end caps is 
>that if you try to use a good vacuum pump, you can suck air THROUGH the PVC 
>end caps! 
><<<
>I believe that what is really happening is that the air pressure put cracks
>in the end cap.  This crack would seal closed when there is no air pressure 
>on it, but spring open when pulling the vacuum.  
>
>I have a small leak somewhere in my end cap and it made an oily mess
>on my floor until I put the darn thing in a bucket.  When I make them 
>in the future, I'll use about 3/4" of epoxy in the bottom to seal the thing
>(I'll actually use the Build50, since I have a quart of it)
>
>By the way, I pulled a vacuum on my cap, and despite the air leaking in,
>I have never had a failure, despite the fact that I run at 15kV.  I used
>oil that the salesman said was transformer oil (it was labeled Mobiltherm
>503(?) Heat transfer oil)
>
>Chip
>
>
     The vacuum isn't going to hurt Mr. PVC, but at close to 29 in. of mercury
it will suck through spots you couldn't find with 20X mag.  In fact, put a
glass of water under this kind of vacuum and watch it boil bubbles until the
water is gone.  Lot of air in water.  Don't believe - try it!

                 
                                  
         Dan M. Lawson    - Manufacturing Jeweler
         laws-at-calweb-dot-com  - Weight Lifter - Bodybuilder