Guv Bob <
guvbo...@yahooooooooooooooo.com> wrote:
>> Anybody who would build a still for moonshine these days is using a
>> stainless-steel pressure vessel, as used in commercial hot water
>> heaters. Available at your local junkyard prefitted with threaded=20
>> connections and a safety valve. You can cut and weld the stuff with=20
>> a cheap mig welder from Harbor Frieight if you want to add a thump barrel
>> or something.
>
>- Compared to copper, stainless steel is a poor conductor of heat. It =
>does not make a good moonshine distillery. The last time I talked to a =
>revenuer he said that to the last one of the stills he had put out of =
>business every one had seams with leaded solder, including Popcorn's.
It's true that it's a poor conductor of heat but in practice this makes
less of an issue than you'd expect, in part because of the sheer thermal
mass of the mash. If you're using electric immersion heating (which I
personally do not recommend especially if you have a mash with pectins
like a fruit brandy), it makes no difference at all. It's not as if you
can heat and cool on a dime anyway.
The _exception_ to that is when you're using reflux condensation in
the pressure vessel deliberately (as mentioned below).
Leaded solder is bad news. Used to be very common, but then again it
also used to be very common for folks to use Model T radiators for the
worm. All that was way before my time and I can't say much about it.
>Some good info about copper from this Portugoose company that makes =
>stills.
>
http://www.copper-alembic.com/
Some of this is sheer propaganda, but some of it is true. These guys
don't talk so much about reflux action, either, which is very important
in a still like that (though the shape is a lot less critical in a modern
moonshine still with a "bubbler" or "thump barrel" for external reflux).
The thermal conductivity of the metal affects the optimal shape if you're
building an alembic still because it changes the way reflux condensation
works.
--Scott