RE: X-ray Power Supplies / bad oil (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 25 Sep 2004 08:58:40 -0500
From: Carl Litton <Carl_Litton@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>, resonance@xxxxxxxxxx
Subject: RE: X-ray Power Supplies / bad oil

Yes, thank you, Doc.  I had heard this.  I need to devise a test to
detect the presence of polychlorinated biphenyls.

Also, what would be a good replacement oil if this becomes necessary?

Carl Litton
901-374-5747


-----Original Message-----
From: High Voltage list [mailto:hvlist@xxxxxxxxxx] 
Sent: Saturday, September 25, 2004 12:37 AM
To: hvlist
Subject: Re: X-ray Power Supplies (fwd)

Original poster: <sroys@xxxxxxxxxxxxxxxxx>



---------- Forwarded message ----------
Date: Fri, 24 Sep 2004 14:15:48 -0500
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: X-ray Power Supplies (fwd)



Caution:

Many of these old X-ray sets contain xmfr oil with PCBs.  That's why
they
are "given away".  The oil disposal would cost approx $1,500 plus
shipping
to a disposal plant which uses a very high temp incinerator.

If the EPA finds out you have it, and it does contain PCB, they will
order
you to dispose of the oil or else pay a $10K fine if they have to come
and
get it.  Either way, if it's PCB, you lose.

Dr. Resonance

>
>
>
>
> ---------- Forwarded message ----------
> Date: Thu, 23 Sep 2004 19:42:01 EDT
> From: Mddeming@xxxxxxx
> To: hvlist@xxxxxxxxxx
> Subject: Re: X-ray Power Supplies (fwd)
>
> In a message dated 9/23/04 6:16:14 PM Eastern Daylight Time,
> hvlist@xxxxxxxxxx writes:
> ---------- Forwarded message ----------
> Date: Thu, 23 Sep 2004 16:48:20 -0500
> From: Carl Litton <Carl_Litton@xxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: X-ray Power Supplies
>
>
>
> We just acquired a donation today of what I am told by the owner of
the
> x-ray repair shop is the power supply to an old 'Frankenstein' era
x-ray
> machine containing a large transformer and a capacitor that reportedly
> hold a very large charge for a couple of days -- all covered in oil.
>
> It is an olive drab steel box 2' cubic weighing a little less than
> 200lbs. with 2 large holes in the top looking down into some clear oil
> and submerged metal.  Large cables come out of the top.  220 VAC input
> to primary and spec. plate reads that secondary output is 120 KVP
> (assuming that to be Kilovolts Peak) at a current of 330 m.a.
>
> Now, I need to know about such devices as this is seriously beyond my
> little (relatively) 39 lb. 15 kV NST's  and appears that it could
> actually be dangerous ;).
>
> Anyone with experience on hi-powered x-ray transformers  - would you
> please direct us to any articles or information on care and feeding of
> such a device and caveats about any salient differences one encounters
> with this type of power supply compared to the usual MOTs, NSTs,
> ignition coils, etc.
>
> [I'm sure more folks will add their thoughts, but XRay transformers
are DC
> devices and will kill you very quickly.  100kVDC is nothing to be
> careless with - your first mistake could very well be your last.  As
> Richard hull would suggest, make sure you always have a friend there
with
> a long 2x4 to push your body off the terminals and put the fires out
(with
> a non-H2O based fire extinguisher!)  SRR]
>
> Carl Litton
> Hilton Hotels Corporation
> 901
> Hi Carl,
>     If your interest is in really understanding how these monsters
worked
and
> were used, I would recommend "The Fundamentals of X-Ray and Radium
Physics,
> 6th ed." by J. Selman, M.D. publ. by Charles C.Thomas, Springfield,
IL,
1980. .
> Has a good practical section on HV power supplies. Used copies sell
for
about
> $5-$7 on Alibris. Older copies (4th ed.1967)discuss 120kV vacuum tube
> rectifiers, mechanical rectification etc.
>
> Hope this helps,
> Matt D.
>
>
>