Air ventilation Piping as smokepipe?

Hi Folk,
I'm in the process to manifest my first Rocketstove, But I live at the moment in Germany and Normal Pipes for Stoves are as expensive as Gold.
The cheapest price I found is about 350 euro for the 25 feed of 8" stovepipe.

This is madness.So I am placed an order for Galvanised Ventilation pipe. But the importend Question is, do anyone knew if there will work or can there be a problem be course there are not a whole pipe there some how Maschiend out of a metal stripe about 2 inch wide and spiral around. I'm a bit worry if the pipe get to hot the metal may expand and the whole pipe may disintegrate?

(a now I found the right translation "spiral duct" the German name is "wickelfalzrohr"
Can that be?

How high is the Temperature at the outlet of the Barrel? Themperatur in Degre Celsius would be aprecheated

And last question, How can I get the "free" plans for the 6" Rocket stove.

Thank you for a reply.

Best

Kurbalagant

The spiral duct should be fine for use in your mass. You may want something a bit stronger for the first meter or two. What we have in the US as "black stovepipe" is a single thickness of (US) 24 gauge steel, often in 2' sections. It's more expensive than thin galvanized duct, but not by a lot. Your stovepipe sounds like code-approved insulated chimney pipe or stovepipe, which is horribly expensive here too.

Hi Glenn,
Thank you for your reply. No the Spiralpipe is not a insulated one it is standart galvanised stell with a thickness of 0.8 mm ( I do not know what this is in Gauge)

In my opinion I was thinking it is ok, I was just a bit worry about the galvanisation but then I saw the Video von Ernie and Erica (the one with the candel flam in the beginning)
Erica was saying after about 45 min into the Video that Galvanised piping is fine and the Temperature is not as high that the Zink would meld.

I think she was talking about 700° farenheit or so maybe just 500 but, I would be even not wory if it melt's I would starting to be worry if it Hypernate than it would be dangerous becourse you will get Cyonite in this case.

Best

Kurbalaganta

Holger Misch wrote:Hi Glenn,
Thank you for your reply. No the Spiralpipe is not a insulated one it is standart galvanised stell with a thickness of 0.8 mm ( I do not know what this is in Gauge)

In my opinion I was thinking it is ok, I was just a bit worry about the galvanisation but then I saw the Video von Ernie and Erica (the one with the candel flam in the beginning)
Erica was saying after about 45 min into the Video that Galvanised piping is fine and the Temperature is not as high that the Zink would meld.

I think she was talking about 700° farenheit or so maybe just 500 but, I would be even not wory if it melt's I would starting to be worry if it Hypernate than it would be dangerous becourse you will get Cyonite in this case.

Best

Kurbalaganta

I forgot: the Black Sipal pipe as you mansion is not availabale here in Germany!