I'm going to be building something - not plumbing - with 3/4" copper pipe. As you can see from
this image, the pipe is a different "color" than the fittings. The fittings are bright copper, the
pipe itself is much duller.
Anybody know why that is or more importantly, how to shine up the pipe so that it matches
Two factors. They use a slightly different alloy in each and the
manufacturing process is different. I believe that is a bit of zinc in
the fitting to make them easier to form. Not enough to be called brass
though. May be some other alloys too.
Many years since I was involved it that. We used different copper
tubing to form return bends for coils than we used for the tubes but I
did not buy the material so I don't know the specs.
On Sat, 26 Mar 2016 23:21:45 -0400, firstname.lastname@example.org wrote:
Even lead free solder will give the whiskey a nasty wang. Stills are
usually solid copper with friction fittings.
I really like glass for this but the size is somewhat limited. I have
used 5 gallon water bottles back when they were glass but you have to
be real careful bringing up the heat slowly and more importantly,
letting them cool down slowly. You can pour the mash out OK but let
them sit on a dry block of wood or something until they are just warm
to the touch before you load the next batch. I had a copper end cap
that was just a nice friction fit in the hole, inverted and a hole in
that for a 1/2" soft copper coil. I leaked a little but it worked. You
can cascade another one behind that for a "thumper" if you really want
to get sophisticated.
The stuff coming out of the thumper will burn in your lighter.
There is drinking whiskey and selling whiskey. If selling, they do not care
about the lead that might come out of the solder.
About 30 years ago the wife and I was watching some show about moonshing and
they mentioned the lead solder. I told her that one day someone is going to
complain about the lead in the solder in the pipes in many of the houses in
the US. About 10 years later someone picked up on this.
Now with all the lead scare, many of the electronic devices are going to
last a few years and then quit because of the tin whiskers.
On Sun, 27 Mar 2016 02:52:08 -0400, email@example.com wrote:
Silver solder is used in commercial stills - along with brazing..
Pretty hard to make a "kettle" without soldering or brazing - an
expert can roll and beed the joints and get them ALMOST hooch-tite -
but any leak will cause the still to blow - so the outside of even a
well rolled seam will be soldered.
Wrought copper fittings are c12200 alloy.12200 is 99.90% pure copper
with phosphorous added to deoxidize..
Seamless copper pipe may be manufactured from any of five (5) copper
alloys (C10200, C10300, C10800, C12000, C12200) that all conform to
the chemical composition requirements of alloys containing a minimum
of 99.9% Copper (Cu) and a maximum of 0.04% Phosphorous (P).
About the only difference chemically between the alloys is the amount
of phosphorous remaining in the alloy. The manufacturing process -
drawn vs wrought, will produce varying grain structures, and the
temper will also change the grain structure - which will cause
variation in the colour of the copper as produced. Some of the colour
variability can be reduced by removing the "mill finish" and oxides by
polishing, but different grain structures will reflect light
differently, producing different colour effects.. Soft drawn (flexible
/annealed) copper tubing will more closely match the colour of the
wrought copper fittings available today.
Years ago the majority of copper plumbing fittings more closely
matched the colour of Type K, L, and M hard copper, while today they
more closely match the soft copper, leading me to believe they have
changed the production method used for producing the fittings. I HAVE
noticed the newer fittings are lighter and appear to be softer than
the fittings I grew up with.
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