Coal Exhaust Rusting Nearby Oil Furnace Chimney

 
2004blackwrx
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Post by 2004blackwrx » Thu. Nov. 19, 2015 8:03 pm

Last year I installed a Keystoker Koker. Its been great. Unfortunately, it is causing rust to form on a nearby SS chimney for my oil furnace. Even though I haven't used the furnace since I started burning coal I do not want to destroy the chimney or have it covered in unsightly rust. At this point it still can be cleaned with steel wool. I have attached pictures. I am looking for ideas to help prevent future rusting of the SS chimney. My best Idea right now is to remove the coal vent top hat and put a 90 on it pointing away from the SS chimney.
chimney rust 1.jpg
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chimney rust 2.jpg
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chimney rust 3.jpg
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chimney rust 4.jpg
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Lightning
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Post by Lightning » Thu. Nov. 19, 2015 9:05 pm

Wow... how far away is the exhaust of the coal appliance from the chimney? It appears to about like 6 feet, maybe 8. I'd be shocked if that is causing the corrosion.

What is that right next to it? A heat pump? Air conditioner? I'd sooner think that was the issue. Condensation?

 
2004blackwrx
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Post by 2004blackwrx » Thu. Nov. 19, 2015 9:26 pm

They are just over 6 feet apart. That is an AC unit. The cause is definitely the coal exhaust because I had no issues prior to the install.

 
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windyhill4.2
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Post by windyhill4.2 » Thu. Nov. 19, 2015 9:30 pm

Why would the steel pipe 6' away rust,but the steel pipe that the coal gases exhaust out thru looks just fine????? :notsure: :gee: :? :confused: :what:

 
2004blackwrx
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Post by 2004blackwrx » Thu. Nov. 19, 2015 9:41 pm

I don't know. But its happening ever since I installed furnace. Its only surface rust and if you look at one part of pipe you see where I cleaned it fairly easily but I don't want it to continue to happen. Its been happening since I installed the coal furnace so it either the coal or the fact I don't use that chimney anymore. Everything else is the same. I this think its the coal exhaust because I hear it is very caustic.

 
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Post by Lightning » Thu. Nov. 19, 2015 9:56 pm

The fly ash is the corrosive agent. Fred makes a good point.

 
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Post by franco b » Thu. Nov. 19, 2015 9:59 pm

Maybe paint the stainless chimney. Rustoleum barbecue paint, brush on stands up to weather very well.


 
2004blackwrx
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Post by 2004blackwrx » Thu. Nov. 19, 2015 10:05 pm

yea I thought of the high heat grill paint. I think that will be option 2. First I want to try to keep the chimney from being affected at all. I don't know if it will work but should it be safe to at least try a 90° elbow on top pointing away from chimney unless there is a better idea

 
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Post by freetown fred » Thu. Nov. 19, 2015 10:14 pm

You're not having a fly ash problem--age of stainless & stove install are just coincidental--crappy stainless--why aren't the wall brackets rusting also??? Why isn't AC unit rusting???

 
2004blackwrx
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Post by 2004blackwrx » Thu. Nov. 19, 2015 10:24 pm

good point about brackets not rusting. They are definitely not SS like the chimney. I should email chimney manufacturer.

 
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Post by franco b » Thu. Nov. 19, 2015 11:35 pm

2004blackwrx wrote:good point about brackets not rusting. They are definitely not SS like the chimney. I should email chimney manufacturer.
If that is Metalbestos (Selkirk) they do honor their guarantee. Do not Email but telephone support.

 
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Post by CoalCaptain » Fri. Nov. 20, 2015 1:08 am

Quality stainless piping absolutelly should not be rusting like that,
regardless of the cause. I have swimming pool ladders and railings that have been
outside for 21 plus years and they have no rust!! I think your piping is garbage...

 
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Post by Richard S. » Fri. Nov. 20, 2015 1:50 am

You have cleanout on the bottom where the T is? How does it look inside?

 
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Post by oliver power » Fri. Nov. 20, 2015 2:20 am

Apparently, the reason the exhaust is bothering the chimney is because the wind blows in that direction. MAYBE you can put a section of wooden stockade fence on a 45* angle, just behind the coal chimney, smooth side facing coal exhaust. When the wind blows, it will blow against the stockade fence, and deflect out around the stainless chimney. You may even put that elbow on you talked about, and point it parallel with the stockade fence. When the wind isn't blowing, fumes may not reach chimney. Or, extend your coal exhaust out further, BEHIND a stockade fence. This way it won't look so gaudy. You can put a deflector at the stainless chimney but, it'd most likely have to go all the way up. Just a little trouble shooting........

 
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Post by coalnewbie » Fri. Nov. 20, 2015 2:51 am

I had the same issue with a iron 1/2" propane gas line about 10' from a powervent exhaust. In areas of very low wind this is an issue. I repainted the gas line and all is well but coal exhaust can be corrosive in the right circumstances.


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