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Post by miniadventure on Sept 9, 2015 18:31:06 GMT
Thanks folks, well i chased back the mortar, enough to fit a 5" internal diameter twin wall flue pipe in. I need to some how funnel the smoke from the original hole in the cast oven up into the new TW flu, the original 5" single skin flue pipe fits tight in the cast hole, it sits 4 inches into that cast and the new twin wall flue sits neatly onto that, the male from the single skin pipe slots into the female of the TW flu pipe. thankfully this all sits low enough for me to re-render back to the new twin wall flu pipe and hopefully no cracks will appear. ONLY concern is, the single skin flue pipe that is slotted into the hole in the cast..... its only 5" long and is a tight fit into the original cast hole, if this is tightly wedged in (i can still pull it out and push in but its very neat) and then when oven is on - also expands and contracts, is the movement enough to bust the actual internal dome cast ? if so how am i going to get the smoke out of the oven into the new chimney.
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Post by miniadventure on Sept 9, 2015 19:06:09 GMT
i could cut a slit in the single skin pipe with an angle grinder then insert that into the cast to allow for expansion? what do you think?
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Post by oblertone on Sept 10, 2015 8:30:29 GMT
The forces generated by the expansion of metals are incredibly powerful, if tightly fitted it WILL crack anything surrounding it. A simple slit in the single wall might not allow enough expansion room so to be safe I'd take out a 0.5" section; you won't see the gap as it'll be covered by your twin wall.
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