[Amps] oil vs distilled water cooling.

[Steve Wright]

On 17/04/15 04:00, amps-request at contesting.com wrote:
> ##  so exactly what is the issue with oil vs distilled water ???   Distilled water
> can be found in 4 litre jugs, cheap, at any grocery store.  To the best of my knowledge,
> distilled water will extract heat a lot faster / better than oil.   I only saw 1-2 small tubes in the
> entire Eimac catalog that used oil cooling.  All their big commercial broadcast tubes are either
> air, or water, or vapor phase cooled tubes.  Or multi-phase cooled.... which is a combo of
> water cooled and vapour phase cooling.
> All of the amplifiers I design and use at work are water cooled, some 
> flowing water and some multiphase, or hypervapotron mode, which is the 
> same thing but a trademark. Its not a tough problem to crack, and I'm 
> dealing with considerable HV. I studied the RCA, Eimac and Thomson 
> recommendations some years ago, and use a common set of specifications. 
> Keep the DC leakage current in the hoses < 500 uA per hose. So for 
> whatever resistivity is maintained, the hose diameter and length is 
> designed for this current (resistance) at the maximum plate voltage to 
> be used. DI water is closed loop cooled, as its New Mexico and we cannot 
> waste water. This complicates things with heat exchangers and secondary 
> loops with cooling towers. Since the water is recycled, we have to watch 
> the ph and the dissolved oxygen level as well. For < 5 kV DC I think the 
> requirements are much less difficult to meet.

Um. Why. Not. Just. Use. Oil.  And be done with all those problems ??

Because the oil is flammable?  Is that the only reason?  How many of
your water cooled amps leak AT ALL?  If they didn't leak water, why
might they leak oil?

I don't get it.


Steve