The Shop > Metal Stuff
Sawed off cupola
vtsteam:
You can see the two separate connections for the tubes here at the tee fitting at the bottom of the pitot. Both are connected to a U-shaped tubing gauge with colored water in it. A ruler is located in the gauge to judge the relative heights of the water on each leg of the U. The difference between the two heights is a measure of the pressure that the pitot tube is sensing. For a furnace this is called blast pressure. And traditionally, in this country at least, it was measured in "inches of water column". This can of course be converted to any measurement system.
BTW if you want a great converter for your computer -- look up Josh Madison's "Convert" online. It's free software. I use it constantly.
(Just checked it -- unfortunately It doesn't calculate inches of water column, but you can add that in its custom tab and then it will in future. 1 inch water column = .00249 bar = .0361 PSI)
Actually, most texts on cupola furnace operation use inches of water column -- so it's usually unnecessary to convert to anything else. And its easy to make a guage if you have a ruler graduated in inches.
vtsteam:
Okay, back to the cupola.
Salvaged materials: a steel packing crate for a tractor mounted chipper. A few pieces of cutoffs from a galvanized fence top rail. A piece of bent semi flattened 2' pipe I found somewhere.
vtsteam:
I cut up some of the crate with a grinder and cut the fence rail with the bandsaw. I put the tube into a container of muriatic acid to get rid of the galvanizing.
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vtsteam:
Cut to length and mitered some pieces of angle iron.
vtsteam:
Welded them together.
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