Alternative coal boiler venting proposal

Alternative coal boiler venting proposal

PostBy: imaddicted2u On: Mon Jan 27, 2014 1:55 pm

My coal boiler and oil boiler vent into the same chimney. The chimney is about 30 feet high. The coal boiler enters below the oil boiler and on the opposite side of the chimney. There is no rise to the coal boiler's stove pipe, it enters straight into the chimney and runs slightly down hill. I'm burning bituminous coal get smoke billowing out the door when I open it even though I have lots of draft. I'm thinking it may be due to the way it has been piped causing a limitation in flow.
It looks to me like the coal boiler's input was changed when the 6" square clay liner was installed. There is a knock out cemented over that I can use, I would just have to cut an opening into the clay liner. The coal boiler would then enter about 6" above the oil boiler. I don't have any room to go higher. This would put about 16" of rise on the coal boiler's smoke pipe. I stuck 2 old elbows in to prove to myself that I have room to rearrange the pipe, you can see them in the pic.
Do you think this alternate piping might make an improvement?
Image
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous

Re: Alternative coal boiler venting proposal

PostBy: titleist1 On: Mon Jan 27, 2014 2:05 pm

I don't see a problem doing it as you described. Instead of 90's, I'd use a T with a drop at the stove exhaust port and a T at the top capped off then you can clean it out mid-season without shutting down & taking the pipe apart.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Alternative coal boiler venting proposal

PostBy: imaddicted2u On: Mon Jan 27, 2014 2:16 pm

titleist1 wrote:I don't see a problem doing it as you described. Instead of 90's, I'd use a T with a drop at the stove exhaust port and a T at the top capped off then you can clean it out mid-season without shutting down & taking the pipe apart.

Thanks, the Tee's for clean out are a great idea. Do you think the coal boiler smoke pipe rising up 16" and then entering would be an improvement over going straight in to the chimney?
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous


Re: Alternative coal boiler venting proposal

PostBy: titleist1 On: Mon Jan 27, 2014 2:26 pm

I don't know if it will be an improvement since it would be introducing an extra 90. However, I would think the immediate riser would be an improvement over the slight downhill direction you describe that you have now.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: Alternative coal boiler venting proposal

PostBy: Berlin On: Mon Jan 27, 2014 5:57 pm

when you open the loading door of the coal boiler, is the baro completely shut or is it partially open? If it's partially open, adjust the baro so that the weight keeps the baro closed when the loading door of the boiler is opened.
Berlin
 
Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
Coal Size/Type: Ohio BITUMINOUS pea stoker coal

Re: Alternative coal boiler venting proposal

PostBy: imaddicted2u On: Mon Jan 27, 2014 8:05 pm

Berlin wrote:when you open the loading door of the coal boiler, is the baro completely shut or is it partially open? If it's partially open, adjust the baro so that the weight keeps the baro closed when the loading door of the boiler is opened.

Thanks for the reply Berlin, I never take for granted that the baro is or will close, I always clamp it shut before opening the door to ensure maximum draft up the flue. The baro weight is set for 0.04" at the breech of the coal boiler using the Dwyer manometer.
imaddicted2u
 
Hand Fed Coal Boiler: American Standard Severn (1957) on bituminous
Coal Size/Type: Unscreened-Fist sized lump to powder-Bituminous