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Post by whazzatt on Apr 15, 2019 5:31:28 GMT -8
Hi. Next project is a simple J tube single bell (i.e. standard drum) mass heater. To state the obvious, the hot air will flow from the burn chamber, up the riser, down between riser and drum, then exit through a manifold leading into a square base for the chimney flue to rest on, i.e. there is no elbow to connect flue to exit after manifold. I have found the pipe pictured below. I don't know what it's made of, might be asbestos, because water pipes in this area were once asbestos and gradually they were replaced. But having never worked with asbestos (phew!) I'm not sure; could also be a ceramic or cement??? Does anyone have any ideas from just looking at the pics? If it's asbestos, and considering that the heat will have diminished considerably by the time it passes through the manifold, is there any problem with using the pipe as a flue? I will not be cutting it.
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Post by martyn on Apr 15, 2019 7:17:07 GMT -8
Looks like asbestos to me.
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Post by whazzatt on Apr 15, 2019 23:44:43 GMT -8
Looks like asbestos to me. Thanks. And the fact that it has been dumped on the road-side also suggests it's an unwanted material. But it's the perfect size for my project. I gather it's simply not worth having asbestos on one's land due to the possibility of having to discard of it at some point? But I'm still curious if it would be a problem to use the pipe as a flue. I would not cut it - and isn't that the only real problem with asbestos, when one cuts it and the resultant air-borne 'dust' is inhaled? (I get why it would not be suitable for channeling water). As mentioned in post 1, the pipe/flue will have to deal with lower temps, i.e. the temp of the air after leaving via the manifold. Could the pipe handle post-manifold temps without causing asbestos-related problems?
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Post by Vortex on Apr 16, 2019 0:43:38 GMT -8
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Post by whazzatt on Apr 16, 2019 2:03:32 GMT -8
Thanks. I have reason to believe (see source, noted below) that the temp after the manifold is well below 300*C, more like below 100*C. The threads do not address use of the pipe as a chimney flue, only as a riser in two instances and a 'burn tunnel' in the other. Basically this boils down to a ' would you or wouldn't you' question. I.e. would or wouldn't you use the pipe as a flue (i.e. post-manifold) where the temps are presumably not too high? (Source: "your build is by the book, if you get around 70C in the chimney pipe, thats max heat extraction" link)
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Post by Vortex on Apr 16, 2019 4:51:08 GMT -8
I dont think I would use an asbestos pipe in my house. I do have an old asbestos cement chimney cowl on my roof though.
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mudder
Junior Member
Posts: 50
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Post by mudder on Apr 20, 2019 5:03:05 GMT -8
trash it but the correct way! nasty.
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Post by drooster on Apr 20, 2019 13:18:03 GMT -8
I would use it.
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Post by whazzatt on Apr 21, 2019 0:23:50 GMT -8
trash it but the correct way! nasty.
It's located on the side of a lesser-used road on the outskirts of a town in which I do not live. I saw it during a walk while I was staying with the wife during a work contract there. We had traveled there in her Toyota Yaris, which is not an option for transporting the 5m long pipe! If I thought the pipe a viable option for the project, I'd travel back to the town in my pick-up truck (called a 'bakkie' in South Africa) during the wife's next stay there, and strap the pipe to the roof. I'm certainly not going to this trouble to dispose of someone's illegally dumped pipe!
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Post by whazzatt on Apr 21, 2019 0:32:22 GMT -8
Thanks. It really is perfect for the project and using it would save the cash I will likely spend on stainless steel flue. It would not even be an additional expense to collect because I'd spend the final week of the wife's contract in that town with her anyway. Having established that it is asbestos (it is, after all, dumped on the side of the road), I might kick myself if I use it now and then eventually have to dispose of it. Final thought for now is that, in recycling the pipe for the project, I would actually be doing something useful with something that would otherwise simply remain an eye-sore for the immediate future and become a problem when someone throws a brick at it or something and it starts breaking into smaller chunks...
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