metal chimney

lightweight · Post by **lightweight** » Sat. Jan. 15, 2022 8:51 pm

reading about metal chimneys for coal; if they are prone to failing from corrosion, how do folks know when to replace them? looks like ya need class A pipes and those have two or three walls? is video inspection the only way?

Den034071 · Post by **Den034071** » Sun. Jan. 16, 2022 9:16 am

Get a masonry chimney lasts a long time.

joeq · Post by **joeq** » Sun. Jan. 16, 2022 9:45 am

I bought my Metalbestos double wall, S/S 6" pipe about 10 years ago,...used. Been burning almost all anthracite that entire time, and so far, no issues. How will I know when its bad? I guess when it falls off the side of the house. Never boroscoped it, but when opening the clean-out, or repairing the chicken wire that rots out on the cap, (and the birds nest in it), I'll take a flashlight, and look for signs of concern. But I have that option, seeing it's located on an outside wall, and the run is 15', straight up.

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KLook · Post by **KLook** » Sun. Jan. 16, 2022 9:49 am

The original I bought for my wood boiler in the late 90's and changed over to coal around 2005 is still going strong. I even burned some coal in the WB and had some soft coal as well.....boy that smoked.

Shaun643 · Post by **Shaun643** » Wed. Jan. 26, 2022 11:05 am

I put my SS chimney up and burned wood for a few years then switched to coal. My chimney is straight up and out my roof. I can see up my chimney and it looks fine to me. I bought all my stuff from Menards and it's holding up fine.

warminmn · Post by **warminmn** » Wed. Jan. 26, 2022 1:16 pm

My metal chimney burned wood for years before coal now for 8 or 10... which makes me ask, would we be better off buying used chimneys from wood burners instead of buying new? Im thinking maybe we should. Probably half the price and could last at least twice as long.

joeq · Post by **joeq** » Wed. Jan. 26, 2022 4:20 pm

Paid $150 for my pipe, and it came with a wood stove. Only wanted the pipe, but the seller said the stove had-ta go too. sold the stove for $100. Meant $50 for the pipe. You can't buy a wall thimble for that price now-a-days, never mind the run of pipe. Like mentioned above, about 10 years on it so far, looks like it'll go another 10.

scalabro · Post by **scalabro** » Wed. Jan. 26, 2022 6:58 pm

My AL429 metal chimney is just over 10 years old and only anthracite have been run in it. I clean it every year after shutdown. No problem so far.

lightweight · Post by **lightweight** » Thu. Jan. 27, 2022 7:20 am

scalabro wrote: ↑
Wed. Jan. 26, 2022 6:58 pm
My AL429 metal chimney is just over 10 years old and only anthracite have been run in it. I clean it every year after shutdown. No problem so far.

what do you do to clean it

tcalo · Post by **tcalo** » Thu. Jan. 27, 2022 8:33 am

Sweep it I assume.

scalabro · Post by **scalabro** » Thu. Jan. 27, 2022 8:35 am

I have a sweep come out to do it.

lightweight · Post by **lightweight** » Fri. Jan. 28, 2022 4:15 pm

what is AL429 metal chimney?

scalabro · Post by **scalabro** » Fri. Jan. 28, 2022 5:13 pm

Sorry AL29-4C

Berlin · Post by **Berlin** » Tue. Mar. 15, 2022 11:00 pm

When the inner liner turns into what resembles swiss-cheesed tin foil.

Happens to most, but not all. Seen plenty with that mode of failure on oil flues as well. I have a theory that iron in the fly ash leading to iron pitting corrosion is a major culprit. Same reason I see it in oil stacks especially on pin boilers where the rust particles are blown up the stack with every burner cycle.