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Re: Help please - info on big CDE pulse caps?
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- Subject: Re: Help please - info on big CDE pulse caps?
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Mon, 24 Jan 2005 08:00:58 -0700
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Original poster: Bert Hickman <bert.hickman@xxxxxxxxxx>
Leave 'em be. It sure sounds like they presently contain mineral oil, and
(unless the oil is heated to well over 100 degrees C), they should not
represent a fire hazard. Shell Diala-X or AX IS fundamentally mineral oil,
so there's no benefit in changing out the oil. You may want to top it off a
-- Bert --
Tesla list wrote:
Original poster: FIFTYGUY@xxxxxxx
Just a follow up - thanks all for the advice so far.
The ".15 MFD" means .15 microFarads.
A few of ya'll voiced your concerns (rightfully so) that these old
caps might contain PCB's. I'd like to state here (semi-publicly) that
they would appear to NOT be PCB filled.
The gummy accumulation at the base of one insulator was, as Jim Lux
guessed, simply gummy old oil. They slosh when shaken, so the oil still
inside is quite thin (even at 45 deg F ambient) - not a viscous
impregnation, as I understand PCB's used in caps tended to be.
Sample oil has very little aroma, and what faint smell is there
resembles fuel oil.
Sample oil floats on water. Even after emphatic attempts at mixing it
all stays on top.
Sample oil supports combustion - vigorously! Burns with the typical
hydrocarbon blue flame with yellow tops. No green tint at all. Hisses and
pops flaming droplets of oil everywhere. Smoke has typical fuel-oil
smell, no acridity/bleachy smell at all.
However, this puts a new light on things. Catastrophic failure may
constitute a serious fire hazard. Perhaps they should be drained and
refilled with modern transformer oil? Would Diala mix with, say, residual
fuel oil or mineral oil, or would it cause more problems than it would prevent?