Re: [TCML] Re: Tar

[Jeff Larson <jeff@xxxxxxxxxxxxx>]

Russell, 

We used to use HV power supplies that were in oil.  They where 55 gallon 
drums that had a frame attached to the removable lid of the drum.  This 
frame had the transformer, the rectifier strings, capacitors and 
metering resistors.
When we did maintenance on these guys, the frame was slowly winched up 
out of the drum leaving the oil behind, mostly.  A messy drippy job.  
After what ever was fixed, the frame was lowered back into the oil and 
it sat for 24 hours or so.  Then it was put on a variac and the voltage 
was brought up in small increments over a day until it was at full 
voltage where it sat for a day warming itself up.  And that was it.  
This is along the lines that the manufacture recommended.  I believe it 
was Universal Volttronics. 
And by the way,  the type of drum these where in would definitely not 
support a vacuum.  I would not recommend pulling a vacuum on a drum like 
that.

Jeff Larson


Russell L Thornton wrote:
> Good point Tony.  I wan't thinking of the contamination aspect. 
> Russell
>
>
> Message: 6
> Date: Thu, 22 Jan 2009 09:27:19 EST
> From: Sfxneon@xxxxxxx
> Subject: Re: [TCML] Re: Tar
> To: tesla@xxxxxxxxxx
> Message-ID: <cac.489f12ab.36a9dc47@xxxxxxx>
> Content-Type: text/plain; charset="US-ASCII"
>
> 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. 
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>
>   

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