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Clay pipe for rocket stove?

 
Posts: 39
Location: Eastern Kansas
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There are some very old clay pipes lying around my family farm. There are 4" inside with 6" flange,  and there is a 36" piece, a 90 degree piece and a 12" x 36" catcher with a 4" connector at the bottom.

Would these stand up to the heat that a rocket stove makes? Seems like if so they would make good stove components.

I'll post some pics when I get back to wifi.
 
Posts: 417
Location: Wellington, New Zealand
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Materials that have been fired at even higher temperatures than produced by a rocket stove will still crack due to differential expansion.

Case in point, my terracotta tile that was manufactured at a temperature of 1200 deg C cracked at 250 deg C in my black oven because I hadn't used a deflector.

So, the use for a clay pipe in your riser would be mainly to hold a ceramic fiber blanket in place with the blanket protecting the clay pipe.
 
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Location: Moved from south central WI to Portland, OR
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? is the fiber blanket around the outside of the clay pipe, or somehow inside of it?
 
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Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
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Julia, i have used tona, Landini, schiedel fire clay tubes.

They work, but don't last as long as i would like to.

I have one pièce, the size of my palm, which bas fallen down the riser of my workshop Heater. So, doing a five minute riser might seem cleverer.
 
Graham Chiu
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Location: Wellington, New Zealand
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Julia Winter wrote:? is the fiber blanket around the outside of the clay pipe, or somehow inside of it?



Julia, the clay pipe surrounds the ceramic fibre blanket. It provides the shape.
 
Julia Winter
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OK, well the original question was about pipes with a 4" diameter.  I don't think you can create a useful riser shoving a fibre blanket into such a small pipe.  

When you said the blanket protected the pipe, that sounded like the blanket would be on the inside, but I don't think there's room in a 4" pipe.  This is why I asked my question.

Having the blanket on the inside would require a pretty good sized clay pipe, maybe twice that size?  Like, 8" across on the inside.
 
Graham Chiu
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Using a 1/4 inch ceramic blanket gives you 3.5 inch diameter riser which is greater than the 3 inch minimum on Peter's batchbox spreadsheet but who knows how useful 3.5 inches is in a real world situation.

The alternative of wrapping the blanket on the outside probably works as well since when the clay cracks the heat won't get out much.  Though those are two different uses since the first is low mass, and the second is high mass.
 
Julia Winter
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Ah, I haven't seen a ceramic blanket as thin as that!

It's a big world out there.
 
Posts: 363
Location: Abkhazia · temperate subtropical climate
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I have recently made my second riser out of clay and wood shavings. Just enough clay to make it hold together. Since the humidity is high in Abkhazia, it was put into use before it could dry out. So far looking great.
 
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