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heat riser material question

 
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I'm beginning to build a rocket stove. I've seen several ideas about what to build the heat riser out of. I know double wall insulated pipe (metalbestos chimney)
only has a temp limit of about 1500 degrees F and this section of the burn chamber should take twice that. I'm making an 8" system.
I'm thinking of using 10" metalbestos pipe and inserting 8" diameter x 3/16" thick steel pipe inside with a small air space between them.
That way I get the simplicity of the pre-made insulated pipe with the protection from the thick pipe.
Has anyone done this?
Does this sound feasible and worth the effort?

Thanks!
 
gardener
Posts: 3296
Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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Metal is doomed!
 
Posts: 245
Location: near Houston, TX; zone 8b
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I second Satamax: Metal is doomed. You need a refractory type material to stand up to the heat from an 8".
 
Brian Shanti
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thanks!
I have since done more research and have concluded that the whole burn chamber and heat riser will be firebrick.
I am a licensed sheet metal guy, and I plan to document the whole project, in hopes that I can build them for other people too.
I will post the photos here, in case anyone is interested.
I tore out the old wood stove today, so let the rocket fun begin!
 
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will be fun to see. good luck with the project.
 
Live a little! The night is young! And we have umbrellas in our drinks! This umbrella has a tiny ad:
Rocket Mass Heater Plans: Annex 6
https://permies.com/wiki/138231/Rocket-Mass-Heater-Plans-Annex
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