John Lyles wrote:
> Jim Tonne is correct, not only for the filter but for the bottles that clean
> up big cooling loops. They call this technique a sliptstream process, where
> it is a side loop with about 5-10% of the main flow. We use Culligan unibed
> and oxygen bottles in what is called a polishing loop, the two of them not
> only remove ionics but also oxygen from the water. In larger tubes that can
> boil water (like vapor and multiphase cooling), Eimac adn the other
> manufacturers want very low dissolved oxygen as well.
>
> Pure DI water can get as resistive as 18 Megohm-cm, which is about the
> theoretical limit. This water would be very difficult on fittings and metals
> as it will scavenge ions, which causes migration through the hoses, and can
> plate the metal ions elsewhere. It is very difficult to maintain this perfect
> water in this condition, as it degrades as it strips whatever ions it can
> through the cooling system.
Even the lower resistivity DI or distilled water will eventually leach
out the brass fittings such as hose barbs leaving them a red color that
is very brittle to the point you can crush/crumble them by hand.
However nearly all fittings are now available in plastic if you aren't
running too much pressure.
73
Roger (K8RI)
> You don't want pure DI water, but a compromise between 100 kilohm-cm and a
> few Megohm-cm is appropriate for most high voltage systems that need cooling.
>
> 73
> John
> K5PRO
>
>
>
>> Message: 4
>> Date: Sun, 20 Dec 2009 23:00:17 -0500
>> From: "Carl" <km1h@jeremy.mv.com>
>> Subject: Re: [Amps] water cooling
>> To: "Dr. David Kirkby" <david.kirkby@onetel.net>, "amps"
>> <amps@contesting.com>
>> Message-ID: <01f501ca81f2$1e3503a0$6501a8c0@DAVES>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> How conductive is pure deionized water? The tube I have here ran close to
>> 7kv and the water flowed thru clear plastic tubing.
>>
>> Carl
>> KM1H
>>
>
>
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