1 90 or 2-45's

1 90 or 2-45's

PostBy: spc On: Thu Nov 22, 2007 4:28 pm

I was reading another post Smoke rolls out load door - any advice?. Will 2-45 degree elbows give me a better draft than 1-90? I have a top vent with about 18" vertical before the 90 & a "T" for the baro & then right to the thimble. Not to much pipe. Thanks.
spc
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pioneer

Re: 1 90 or 2-45's

PostBy: coaledsweat On: Thu Nov 22, 2007 9:43 pm

I subscribe to the least amount theorey. The least amount of pipe, elbows, angles and thimble pipe. If you have a great chimney, it really doesn't matter if you have a few turns. A poor one can make life difficult.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: 1 90 or 2-45's

PostBy: WNY On: Fri Nov 23, 2007 8:28 am

I don't think it would affect it that much, I would think the straighter the pipe, the better airflow and draft, also, I read somewhere, that Elbows, TEE, etc.. add "XX" in equivalent pipe length. (ie. 90 Deg. Elbow is equal to 10 feet of straight run? or something like that)
WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon


Re: 1 90 or 2-45's

PostBy: Matthaus On: Fri Nov 23, 2007 1:39 pm

Actually two 6" 45* Els would have slightly less loss than a single 90* EL. The cost however, does not make this worth it. :)

Forgot the ratios on the table, they are 1/4, 1/2 and 3/4 going down from the top row for d/D.
Matthaus
 
Stoker Coal Boiler: Leisure Line WL110 Dual Fuel, natural gas
Hot Air Coal Stoker Stove: Leisure Line Lil' Heater (rental house)
Coal Size/Type: Rice and Buckwheat Anthracite