Icefever wrote:Right I've got the chance of a used clean copper tank, heater fitted and working. Now what's going through my noggin is to use this to make my still. Cut it down to say 40/50 liters, make the top from what's cut from the middle.
Stop.
Before you cut the boiler let me just say, If you cut a hot water boiler in 2 it will lose all the rigidity. All the strength is in the thick top and bottom domes, the side walls are VERY thin.
Also the standard way for the element to be fitted is in the top dome, which is fine for a hot water tank which is always completely full of liquid, this is not how a still works, so you need to cut and solder a flange down near the bottom.
Soldering on such a large piece also requires quite a bit of heat, so you will soften the copper around the flange, so it probably best to work harden it again.
You can have a lot of head room in a still - so make sure you really want to reduce the size.
I'd be tempted to figure out an opening in the copper dome, rather than cutting the sides, this will keep the boiler rigid.
Have a plan before you make a cut, sleep on it for a bit. You'll figure out what's what.