Re: [TCML] Re: Tar

[Sfxneon@xxxxxxx]

Bob,
 
If you pull a vacuum in the transformer can, be sure it is strong enough to  
withstand the difference in pressure. Atmospheric pressure will crush even a  
round steel 55 gallon drum if a vacuum is created inside. There is a  ton 
(literally) of pressure on each square foot with only 14 PSI pressure  difference, 
so be careful you don't implode the transformer can.
 
I also seriously doubt that any sign shop would try to evacuate a  
transformer can with their pumping system. That's not what it was designed to  do. I 
wouldn't want to risk contamination of my pumping system with oil vapor or  the 
possibility of sucking oil into the manifold. 
 
Tony Greer
Special Effects Neon
___________________

In a message dated 1/22/2009 7:24:22 A.M.  Central Standard Time, 
Russell.L.Thornton@xxxxxxxx writes:
Bob,
The two  vacuum pumps that you mentioned will do fine and in fact more than 
you  need.
They are designed to boil water in a closed system at room temperature.  
You just need
enough to pull the air out by expanding existing bubbles so  they have to 
escape their
little hiding places.  If you could get  the cover to seal you could, more 
than likely, get
an AC/refrigeration or  sign shop to pull a vacuum for you at a price much 
less than buying
a  pump that will just take up room in your shop. You could use the same 
story  many use to get neon
sign transformers for free by stating this is for  education 
demonstrations.  I expect they
would pull a vacuum for  free, too.  They aren't out anything but a few 
watts.
Good luck with  it.

Russell at the Cape

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