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SS flue liner in chimney for oil boiler #5316686 01/08/20 11:15 AM
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Donald Online Content OP
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We have your normal flue tile and block chimney maybe 20 years old. The Buderus boiler using it is very efficient and that means low stack temperature. That seems to have have caused flue gases to condense around the thimble and there are cracks and one missing piece inside the thimble. I thought flue tile could take anything. Guess not.

So I am being told the proper way to fix this is to get a SS liner installed in the chimney and it will be set.

Comments?


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316711 01/08/20 11:45 AM
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I think your right to reduce the area of venting with a S.S. Liner.
By how much ? There must be a formula based on BTU's and distance of vent.

My house had the Furnace and Hot Water Tank both venting up a Galvanized Roof Vent / all was well.

I then had an energy efficient Furnace installed, that vented thru PVC out back of house.

The furnace installer 'never' commented that the original venting may be to much for just the H.W. Tank.
I went on-line and ordered a stainless liner and fed it down from the roof (ranch house).

This is where you use the Pi formula for surface area of different diameters.
I just took a guess. I suggest you talk with a Professional.


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316737 01/08/20 12:11 PM
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Isn't galvanized an option?

I have had galvanized flues last very well inside of a mortar chimney.

Stainless is only required for Wood Burners (or so I thought)....... YMMV, check local codes, blah blah blah.....


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316746 01/08/20 12:19 PM
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oldhp Offline
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Save yourself some trouble and use the SS liner. I've had galvanize rot out twice. Once for hot water heater, venting into basement, and one for the furnace, it too was leaking into the basement. I know it's in the flue liner but do it right the first time. I have SS triple wall on both hot water heater/furnace now.


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Re: SS flue liner in chimney for oil boiler [Re: MasterSolenoid] #5316753 01/08/20 12:26 PM
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Donald Online Content OP
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Originally Posted by MasterSolenoid
I think your right to reduce the area of venting with a S.S. Liner.
By how much ? There must be a formula based on BTU's and distance of vent.

My house had the Furnace and Hot Water Tank both venting up a Galvanized Roof Vent / all was well.

I then had an energy efficient Furnace installed, that vented thru PVC out back of house.

The furnace installer 'never' commented that the original venting may be to much for just the H.W. Tank.
I went on-line and ordered a stainless liner and fed it down from the roof (ranch house).

This is where you use the Pi formula for surface area of different diameters.
I just took a guess. I suggest you talk with a Professional.


In this case I think the goal of the liner is to line it with a material that will resist the damage done by condensed flue gases.

Not to change the surface or area of the flue.

But I am certainly not a heating or chimney SME.


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316828 01/08/20 01:53 PM
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madRiver Offline
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Don't waste time and money installing galvenized. The galvanized between my boiler and chimney has rotted out twice and that is exposed in 10 years.

Stainless steel is the way to go. Modern boilers require them because they run less heat up chimney leading to condensate and rot. My chimney was a mess so I had the stainless liner installed. Make sure the proper sizing in put in and can fit into your chimney. Narrower chimney's sometimes require the tile liners to be ripped out to fit the SS liner.

Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316867 01/08/20 02:50 PM
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Donald Online Content OP
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I took off the flue pipe and got a better look inside. Looks like all that is needed is a new thimble.


IMG_20200108_145343.jpgIMG_20200108_145349.jpg
Last edited by Donald; 01/08/20 02:51 PM.

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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316868 01/08/20 02:52 PM
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Oily_Thing Offline
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No need to guess. There are organizations that publish flue venting tables, like this one:


[url=https://www.questargas.com/ForEmployees/qgcOperationsTraining/Misc/gama_venting.pdf][/url]


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316876 01/08/20 02:59 PM
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In this case I think the goal of the liner is to line it with a material that will resist the damage done by condensed flue gases.
Not to change the surface or area of the flue.
But I am certainly not a heating or chimney SME.


I'm not an expert, but my understanding is:
The heat rising in the vent also carries with it condensation and CO2.
If the heat can not rise high enough (cools in a to large diameter vent) you will have condensation and CO2 coming back out the bottom.
So you would want to change the area of the flu (vent dia.) to smaller size so any heat can make it to the top.
I would definitely go stainless.


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316889 01/08/20 03:17 PM
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I would suggest having a chimney sweep inspect your chimney as the rest of it may be great or poor shape. You can only see the bottom of it.

Mine was rotting apart at the top end of the chimney and I could put my fingers into the mortar(well dust) rotting out.

Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316891 01/08/20 03:19 PM
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I am assuming this is the NY house?

I will just post my setup, some points my apply, others not.

My house is circa 1880 with a unlined brick center chimney that supports the house; Previously (like 100 years ago) there were several coal stoves plumbed into it; About 20 years ago I had the bottom repointed and parged and the top 10 feet rebuilt; They also installed a SS chimney liner (ventinox) for all the reasons mentioned above (oil HA heat), especially reducing the surface area. The entire bottom 6 feet of the chimney's mortar was basically dust. A side benefit (for me) is the liner is a safety factor for as I have oak joists and beams directly contacting the chimney.

I have not looked @ or even considered looking @ its condition; I'm in the "make it as good as you can" if you touch it category; probably doesn't apply to your setup, but I'm glad I addressed it with a SS solution.

Quote

I have had galvanized flues last very well inside of a mortar chimney.


What part of the country? If this his Albany area house HMMV

Last edited by simple_gifts; 01/08/20 03:25 PM.

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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316922 01/08/20 03:53 PM
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Need to look at the install manual for approved flue and size. Whats the model and serial#

Re: SS flue liner in chimney for oil boiler [Re: Donald] #5316935 01/08/20 04:11 PM
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I had a chimney repair company come and inspect and they want to install a SS liner.

A masonry company might want to replace the thimble.

Obviously a lot more money in installing a SS liner than a new thimble.

Home is for sale. So it needs to be fixed properly but no need to go overboard.


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5317176 01/08/20 08:36 PM
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Pamphlet NFPA 54 venting tables for gas but memory fails on which publication for oil. Here we had a poured in liner for the wood stove that had to sized to the vent size of the stove.which was 6 in.


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Re: SS flue liner in chimney for oil boiler [Re: Donald] #5317225 01/08/20 09:31 PM
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Since I put a chimney cap on my flueless 100+ yr old ex coal stove exhaust that sheds water. I took a an oil burner techs advice and re-did the pipe/ chimney connection for it and the propane water heater vent. I was working on my side in a crawl space. The chimney was full of soot which had collected along with the sweepings from using my 9X12 flue brush on 32' of rods. Pretty grubby working conditions but once the soot was disposed of, a few bricks and a bag of mortar mix fixed it right up.. I see no reason to line a brick chimney that draws so well. I've been up on the roof and felt the air column of exhaust coming out of the chimney. I have little faith in a sheet metal chimney compared to a masonry one. grin2


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