[TheForge] Re: TheForge Digest, Vol 55, Issue 31

[williamsiron at comcast.net]

I agree with Andy. I use 12" diameter pipe for my flue and it works just fine. You could check in ABANA's Coal Forge Handbook for an excellent discussion of flues and caps.

Mark Williams
Snow Hill, Maryland

-------------- Original message -------------- 
From: Andrew Vida <osan at netlabs.net> 

> What the hell do you want a 24" flue for? Unless you are going to be 
> burning a really large fire, I see no reason for something that big. 
> Now, my thermodynamics is about 30 years unused but IIRC you need to 
> have enough thermal volume to drive the convection properly. For 
> example, if I hold a match in a typical 9" flue, the thermal volume is 
> not enough to make the flue draw. A "normal" sized fire, OTOH, will do 
> just fine. So unless you're planning on a really large fire, I'd forget 
> about so large a flue. Sometimes less is more. :) 
> 
> Cindy and James wrote: 
> > Flue pipe? 
> > 
> > Any of you fellows ever built a coal forge flue using big steel pipe? I 
> > am looking for 16 - 24" pipe, no luck yet. Any comments appreciated. I 
> > will need my flue to be approx. 25-30' tall to give 3-4' clearance above 
> > roof line. now is the time for this as if all goes well we will have a 
> > new roof on the shop soon. 
> 
> -- 
> 
> -Andy V. 
> 
> You made them strong. 
> We make them Army dead. 
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