[TheForge] flues

Thu Jan 17 16:44:38 EST 2008

Doesn't that apply to disparate fuels?

Oil. gas. solid fuels?
Even that will work if done correctly (The coarser fuel getting first 
dibs on the flue. When I started we had all sorts of coal, oil, gas 
combinations in a single masonry flue with never a problem)
The codes have no problem with multiple gas or oil burners in a common 
flue as long as the flue matches the highest standard applicable. (Gas 
requires a minimum of class B oil , wood and coal class A) and the flue 
is properly sized.

The problem I see as a possibility is that too large a flue on the wood 
burner might cause creosote problems.
Flue velocity plays a role with both the creosote and with water 
condensing on gas fired flues.

Mike Graf

Peter Hirst wrote:
> The Uniform Building Code, which most likely applies in your area, 
> prohibits venting two fire sources through a single flue. Despite 
> that, a shop I work in part time has a similar setup with the forge 
> and a kerosene heater and works ok. The heater is on a 6" and the 
> forge is on an 8", and the flue above the point where they join is 
> just 10". Add the necessary area for each source to determine the 
> total area for the main flue.  (Don't add the diameters, add the areas 
> of the cross sections).  The area of a round flue is 3.14 x  (radius 
> squared).  So a 6" has a section of  about 28.25 sq. in, and the 8" 
> has a section of about 50.25.  The ten inch has 78.5.  Voila.
>
> PGH
>
>
> ----- Original Message ----- From: "Ben Barrett" <stircrazyben at gmail.com>
> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> Sent: Thursday, January 17, 2008 2:43 PM
> Subject: Re: [TheForge] flues
>
>
>> This is a great conversation, guys, thank you all -- I have an
>> additional question as I am also developing my plan to install a flue
>> pipe.  In my shop, I'd like to pipe a small woodstove and my coal
>> forge's flue together, so there is only one hole in the roof.  I was
>> figuring that the most sure-fire (heh) way to maintain a good draft on
>> either or both would be to make a good-sealing damper on each pipe
>> below the "Y" piece that will bring them together.
>>
>> I am planning on having the Y joiner just above the forge hood (which
>> will have a drop pipe too, I hope, if I can fit it, so prolly above
>> where the drop pipe raises up to), but still inside the shop.  This
>> joiner is the only horizontal dog-leg I can foresee in my plan.  Is
>> there any good or bad luck folks have had with sharing a flue like
>> this in their homes or workshops??
>>
>> thanks!
>>
>> ben
>>
>>
>> On Jan 17, 2008 11:31 AM, David E. Smucker <davesmucker at hotmail.com> 
>> wrote:
>>> I 2nd Ron comment about using a section of culvert.  A 20 ft length 
>>> is not
>>> too expensive and most are about 16 gauge with stiffening added by the
>>> corrugation.  My stack is a 20 ft length of 15 inch culvert with a 
>>> shot gun
>>> top.  I have a large hood, not a side draft and it pulls very well.  
>>> One
>>> area that a lot of smiths loose draft is by what they place at the 
>>> top of
>>> the stack.  Depending on design the rain hood, can cut the stack 
>>> draft in
>>> half.
>>>
>>> Dave Smucker
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "Ron Childers" <munlaw2 at hcsmail.com>
>>> To: <GHS at execpc.com>; "'Sponsored by ABANA'" <theforge at mailman.qth.net>
>>> Sent: Thursday, January 17, 2008 12:24 PM
>>> Subject: RE: [TheForge] flues
>>>
>>>
>>> >A steel culvert seems to work well.... Ron C
>>> >
>>> > -----Original Message-----
>>> > From: theforge-bounces at mailman.qth.net
>>> > [mailto:theforge-bounces at mailman.qth.net] On Behalf Of GRAF
>>> > Sent: Thursday, January 17, 2008 11:53 AM
>>> > To: Sponsored by ABANA
>>> > Subject: Re: [TheForge] flues
>>> >
>>> > For 12 inch the MINIMUM I'd use is 24 gauge. Heavier if you can 
>>> manage
>>> > it. Above 8 inch the size of the pipe makes it unstable 
>>> dimensionally > in
>>> > the lighter gauges. When you are up in the wind having things 
>>> collapse
>>> > above a brace because it didn't stay round would not be a good thing.
>>> > Mike Graf
>>> >
>>> >
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