Since this is my first build I have no experience but it seemed to me that if the heat out of the top of the riser is enough to disintegrate a metal core after a short time it would have to burn through the top of the barrel just two inches above the riser. I think, as Gadget suggested, that I'm going to cut several barrel lids I have so that they will fit inside the bell barrel and bolt them up through the bell to act as sacrificial lids Unless someone thinks this is a stupid idea. A stainless barrel would be great. However no money.
Last Edit: Aug 31, 2019 4:47:49 GMT -8 by dirtdevil
The heat low inside the riser is capable of eating a metal core away, that's true. At that spot the heat is confined to a small space and there's a lot of oxygen around. A good recipe for rapid corrosion, that's what it is.
At the top of the riser the hot gasses spread out, the more space above the riser the larger the spread. The temperature of the barrel above the riser also depends on how fast heat is dissipated. Anything on top of the barrel that lowers down heat shedding at that spot will shorten the life of the metal.
I'd recommend a larger top gap, more space above the riser lowers the temperature of the steel at the hottest spot. A larger top gap won't hinder the workings of the system, rather the contrary. Nothing on top of the barrel ensures the heat is dissipated the quickest.
Last Edit: Aug 31, 2019 6:22:04 GMT -8 by peterberg
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deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
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deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
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deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
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