--- In email@example.com
, "rye_junkie" <rye_junkie@...>
> I am building a small 1.5 gallon still that I can run off of my stove
> top in the kitchen. Similar to the Erlenmeyer setup on
> Does the smaller 1/2" OD tubing do an efficient job or does it really
> make any difference in a pot still. Just wondering if I am wasting my
> time. I have seen the Tea kettle and also Kegs that had small tubing
> ran to the worm but do they work?
Sure they work fine. The amount of vapor that can pass is significant,
until the vapor reaches the speed of sound. Then the pipe becomes
choked. No amount of pressure will cause the speed to increase. But the
vapor can become more dense in the tube. Generally the pressure has to
reach between 13 and 14 psi on a gage before sonic velocity is reached
and the pressure really starts to build. As long as the power into the
still is managed well you can get a gallon an hour through it easily
without much back pressure.
This is somewhere in the range of 2.2KW or the power of the large eye
in an electric stove. If you blow air through a coil of half inch
tubing it takes about 50 feet to knock down 2.2kw of vapor to get about
a gallon an hour. I generally don't like running mine so hard though
because the alcohol comes out hot.