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Subject: Re: help with vacuum leak detection

Date: 01/12/02 at 1:18 AM
Posted by: Bill S
E-mail: wls@intac.com
Message Posted:

In Reply to: Re: help with vacuum leak detection posted by Pat McMahon on 01/11/02 at 10:46 PM:

Thanks for your note. Your help is much
appreciated. The tank itself is glass about 9"
in diameter, 36" long with 1 inch flanges top and
bottom. The top flange is ground, the bottom one
is not. The top is closed with a bell jar. The rim
of the bell jar has a Buna rubber gasket fitted to
it. The bottom is closed with a 3/4" glass plate
that has two 1/2" holes drilled in it. The glass
plate is fitted with a Buna rubber gasket, same as
the bell jar on the top. There are two feed thru's
fitted to the bottom plate. One contains a soft
seat needle valve and the other contains a mil
spec multi pin connector, vacuum rated. There are
two links below that show the connectors and the
tank. Each feed thru is about 1 1/2" square with
a 1/2" nipple coming out the back. They are
machined from one piece of brass and the square
part that is against the glass plate is fitted
with a rubber gasket. The connector that is fitted
to the second feed thru is also gasketed. Before
I pumped it down I applied vacuum grease to all
of the appropriate surfaces. Let me
know if you need any more information, and thanks

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