Will coal ash/soot corrode a galvanized metal building?

Will coal ash/soot corrode a galvanized metal building?

PostBy: RoundOak On: Mon Jan 06, 2014 11:11 pm

Hi Y'all!

I'm new to using coal, so I've been lurking here reading up on it as much as I can, and I think I've got a pretty good grasp of things. (Just enough to be dangerous?)

A little info...

I have a Round Oak coal furnace in my workshop. I don't know the model, but it's a 72,760 BTU, 535 CU.IN. unit with a squirrel cage blower on the back and duct openings on top. It came from a house in northern Missouri that was built in 1910, but I don't know if it was installed then or added later.

I brought it back here to central Oklahoma to heat my workshop. I've been burning wood in it for the last several years but thought I'd try using coal, mainly so I can keep my workshop above freezing at night without having to add wood every two hours. I started searching the web for info on coal, went and bought a ton from a local mine, and thought I was all ready to go. BUT, I have one major concern...

Will the fly ash destroy my galvanized metal building?

It's an all metal building similar to these.
http://www.futurebuildings.com/future-s ... dings.html

I thought about switching to coal if I liked it because that's what the furnace is designed for, or just using the coal during the night and wood during the day. But I saw this post and now I'm afraid to even try using the coal at all.
http://nepacrossroads.com/post129121.html#p129121

How many of y'all have metal roofs or workshops, and what kind of rust or corrosion problems have you had?


Thanks for the info!
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RoundOak
 
Hand Fed Coal Furnace: ~1910 Round Oak
Other Heating: Wood

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: rockwood On: Tue Jan 07, 2014 1:02 am

Welcome to the forum!

I'm in Utah so the climate is different than where you are, but I've never seen a metal roof corrode/rust from coal smoke or fly ash. I have seen metal, as well as all types of roofing, get stained from coal soot though.

Check out this photo...This is kind of an extreme case but I have seen roofs stained with black coal soot to that extent.
http://inspectapedia.com/chimneys/Chimn ... 5_DJFs.jpg

So you probably will see some staining around the base of the chimney where it exits the roof, but again, I've never seen a metal roof rust through or anything like that from burning soft coal...at least not with the coal around here.
rockwood
 
Hot Air Coal Stoker Furnace: Stokermatic coal furnace
Hand Fed Coal Stove: Rockwood Stoveworks Circulator
Baseburners & Antiques: Malleable/Monarch Range
Coal Size/Type: Soft coal: Lump and stoker (slack coal)

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: Berlin On: Tue Jan 07, 2014 3:03 am

Make sure the stack is tall enough that the smoke doesn't roll down the roof when the wind is blowing and you'll be fine. Be sure to "bank" the fire for best performance, use the largest sizes you can get and remove any cap or screen on top of the stack.
Berlin
 
Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
Coal Size/Type: Ohio BITUMINOUS pea stoker coal


Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: Dennis On: Tue Jan 07, 2014 7:31 am

rockwood wrote:Welcome to the forum!

I'm in Utah so the climate is different than where you are, but I've never seen a metal roof corrode/rust from coal smoke or fly ash. I have seen metal, as well as all types of roofing, get stained from coal soot though.

Check out this photo...This is kind of an extreme case but I have seen roofs stained with black coal soot to that extent.
http://inspectapedia.com/chimneys/Chimn ... 5_DJFs.jpg

So you probably will see some staining around the base of the chimney where it exits the roof, but again, I've never seen a metal roof rust through or anything like that from burning soft coal...at least not with the coal around here.


In all fairness,the chimney in the pic. is a metal brick looking pre-fab. We had one at my parents home and it looked the same,and only oil burner hooked to it.The entire metal chimney is staining the roof,not fly ash.
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: freetown fred On: Tue Jan 07, 2014 8:02 am

NONE :)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: blrman07 On: Tue Jan 07, 2014 8:12 am

I had some staining on a regular shingle roof after burning wood and some high sulfur bit coal in the wrong type of stove. Never could get the air right but it burned anyway. I was given a WHOLE BUNCH. When it ran out I stopped burning the high sufur bit coal and it went away. It was a metalbestos outside chimney and the support plate at the base was mild steel. It stained also but after two years of use there was no sign of rust or corrosion.

Shoot if someone gives me some coal, I don't care what it is I'll figure out a way to burn it!!!! :woot:

Rev. Larry
blrman07
 
Hand Fed Coal Boiler: Bucket a Day
Hand Fed Coal Stove: Vigilant Casting 2310
Baseburners & Antiques: rebuilding a 1906 March Brownback Double Heater, using a UMCO 1920's Pot Belly stove in the church
Coal Size/Type: Pea/Nut/Wood in the VC and anything that will fit in the Bucket a Day. It's not fussy.

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: carlherrnstein On: Tue Jan 07, 2014 10:09 am

No it wont corrode your roof. You might get a black patch from the smoke.
carlherrnstein
 
Hot Air Coal Stoker Stove: combustioneer model 77B
Coal Size/Type: pea stoker/Ohio bituminous

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: nortcan On: Tue Jan 07, 2014 11:39 am

Berlin wrote:Make sure the stack is tall enough that the smoke doesn't roll down the roof when the wind is blowing and you'll be fine. Be sure to "bank" the fire for best performance, use the largest sizes you can get and remove any cap or screen on top of the stack.


Berlin, just want to be shure ( about my English translation :( ), do you mean that it's better to remove the rain cap?
nortcan
 
Stove/Furnace Make: Stuart,Peterson/ Grander
Stove/Furnace Model: Sunnyside/ Golden Bride

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: rockwood On: Tue Jan 07, 2014 3:15 pm

Dennis wrote:
rockwood wrote:Welcome to the forum!

I'm in Utah so the climate is different than where you are, but I've never seen a metal roof corrode/rust from coal smoke or fly ash. I have seen metal, as well as all types of roofing, get stained from coal soot though.

Check out this photo...This is kind of an extreme case but I have seen roofs stained with black coal soot to that extent.
http://inspectapedia.com/chimneys/Chimn ... 5_DJFs.jpg

So you probably will see some staining around the base of the chimney where it exits the roof, but again, I've never seen a metal roof rust through or anything like that from burning soft coal...at least not with the coal around here.


In all fairness,the chimney in the pic. is a metal brick looking pre-fab. We had one at my parents home and it looked the same,and only oil burner hooked to it.The entire metal chimney is staining the roof,not fly ash.


I just wanted to posted a photo that best resembled a roof stained with soot from burning coal...Because I grew up in an area where heating with soft coal was very common, I have seen roofs stained with coal soot very similar to that photo...especially where chimney caps were used.
Last edited by rockwood on Tue Jan 07, 2014 3:37 pm, edited 1 time in total.
rockwood
 
Hot Air Coal Stoker Furnace: Stokermatic coal furnace
Hand Fed Coal Stove: Rockwood Stoveworks Circulator
Baseburners & Antiques: Malleable/Monarch Range
Coal Size/Type: Soft coal: Lump and stoker (slack coal)

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: freetown fred On: Tue Jan 07, 2014 3:37 pm

Just my personal use, but I would NEVER remove my rain cap
nortcan wrote:
Berlin wrote:Make sure the stack is tall enough that the smoke doesn't roll down the roof when the wind is blowing and you'll be fine. Be sure to "bank" the fire for best performance, use the largest sizes you can get and remove any cap or screen on top of the stack.


Berlin, just want to be shure ( about my English translation :( ), do you mean that it's better to remove the rain cap?
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Will coal ash/soot corrode a galvanized metal building?

PostBy: carlherrnstein On: Tue Jan 07, 2014 3:45 pm

Neither would I Fred but, sometimes soft coal soot will plug them up.
carlherrnstein
 
Hot Air Coal Stoker Stove: combustioneer model 77B
Coal Size/Type: pea stoker/Ohio bituminous