Flue Liner Vs. Thimble Size?

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Dragonslayer
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Stoker Coal Boiler: Yellow Flame w/model A stoker
Location: Central PA

Post Mon. Jul. 23, 2012 5:22 pm

Hello All. I am having a chimney built as part of a boiler room addition to my shop. I have a Yellow Flame boiler that I plan on using but may switch to an EFM 520 sometime down the road if the Yellow Flame would become difficult to get parts for, etc. Both require 8" flue pipe. After reading all the posts I could find concerning this the consensus seems to be I want an 8" x 8" flue liner with an 8" thimble. After talking to my mason he said it is doable, but a bit funky. He said normaly an 8" thimble needs to go into a 8" x 12" flue liner. I have read many posts stating to large a chimney can cause draft issues in certain instances. This is brand new and I want to get it right and not have any draft issues if at all possible. Chimney height will be approximately 21'. Any help would be greatly appreciated!
Thanks!

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Rob R.
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Stoker Coal Boiler: EFM DF520
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Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Mon. Jul. 23, 2012 7:14 pm

I believe the 8"x8" tiles are 8" OD....so anything more than a 7" thimble won't cleanly go through the side of tile. My recommendation is to use 8" round tiles with an 8" thimble, all work well together and the draft is excellent due to reduced turbulence in the round flue. If the round flue tiles aren't available in your area, step up to an 8"x12" flue...which is really a 9"x13" OD tile. :roll:

My chimney is constructed with 9"x13" tiles and is about 32' high, it drafts well and allows me to run my EFM through the hottest weather without issue.

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coaledsweat
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Post Mon. Jul. 23, 2012 11:37 pm

Dragonslayer wrote:After reading all the posts I could find concerning this the consensus seems to be I want an 8" x 8" flue liner with an 8" thimble. After talking to my mason he said it is doable, but a bit funky.
Seems funky to me too. From what I have seen, the flue is always 2" or more larger than the thimble.
Nothing is impossible for people who don't have to do it themselves.

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freetown fred
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Post Tue. Jul. 24, 2012 9:44 am

Then would not the 8X8 actually be 9X9-----LOL go to a place that sells them with your tape measurer, OR, trust your mason knows what he's doing. ;) I mean, you & him are actually there!
Rob R. wrote:I believe the 8"x8" tiles are 8" OD....so anything more than a 7" thimble won't cleanly go through the side of tile. My recommendation is to use 8" round tiles with an 8" thimble, all work well together and the draft is excellent due to reduced turbulence in the round flue. If the round flue tiles aren't available in your area, step up to an 8"x12" flue...which is really a 9"x13" OD tile. :roll:

My chimney is constructed with 9"x13" tiles and is about 32' high, it drafts well and allows me to run my EFM through the hottest weather without issue.
"A people that values it's privileges above it's principals, soon loses both"--Dwight D Eisenhower


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Rob R.
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Stoker Coal Boiler: EFM DF520
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Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Tue. Jul. 24, 2012 10:05 am


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Berlin
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Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
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Location: Buffalo/Adirondacks, NY

Post Wed. Jul. 25, 2012 12:43 am

go with an 8/12 modular tile in a precast block designed for 9/13, fill the resulting gap with vermiculite, put an 8" round thimble in and be done.

(rob, they have 9/13 standard and 8/12 modular tiles... of course bear in mind that quality control even from the best mfgr's such as superior and logan is something to be desired, they're rarely cut square and the actual dimensions may vary 3/4 of an inch)
Burning western Pennsylvania Bituminous in WNY using model 77 stoker furnace. BITUMINOUS equiptment: 2 hand fired stoves of my own design, Many Combustioneer Model 77 stokers, stokermatic furnace, Many Will-Burt stokers, & and Two Iron firemen.

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blrman07
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Location: Girardville Pa.

Post Wed. Jul. 25, 2012 8:54 am

You can get parts for your Yellow Flame boiler from Marks Supply in Shanendoah Pa. As far as I know he is the only one with parts.
Rev. Larry
Ashland Pa.

1 John 1:9... If we sin and we confess that sin He is faithful and just and will forgive us and cleanse us from all unrighteousness.

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