Flue pipe

[emq]

I have an 18x48 evaporator that has a 7 inch pipe can I use an adapter to connect it to my existing 6 inch
Pipe with out creating an issue
Thanks

[ecolbeck]

What brand of evaporator is it? The Canadian brands that I’ve used (CDL and D&G) have pretty small fireboxes. My calculations suggest that going from 7” to 6” pipe would result in a loss of just over 25% of the capacity of the flue. Not sure how much that would affect its operation. You may not be able to get as hot a fire as you would otherwise but that may not end up mattering too much. You could try it for a season and then change it out if you were unhappy.

[Pdiamond]

That would be almost the same as a 24 x 36 small brothers barrel evaporator and those have a 6 inch pipe. I agree with ecobeck, you can try it and if it reduces you drafting ability in your firebox, then you will know.

[ecp]

I'd say if you have forced air you will most likely be fine. If you are depending on natural draft id stay away from reducing because it may equal many many more hours in the sugar house due to the fact your fire will not get as hot.

[NhShaun]

If you are relying on natural draft and decide to reduce down to 6 inch before changing the whole system. You could try and extend your chimney pipe out the roof a few more feet to make up for some lost draft. When i added a few feet to my 8 inch stove pipe to clear the cupola it made a noticeable difference in the roar of the fire once i shut the door. I had a 3ft base stack and 10ft of chimney before adding another 3ft section at the top. Not sure if this is the right approach for your set up, but it's cheaper than changing over to all 7 inch.

[buckeye gold]

NhShaun is on the right track I believe. Just reduce and go higher by one section of pipe.

[Daveg]

I have an 18x48 evaporator that has a 7 inch pipe can I use an adapter to connect it to my existing 6 inch
Pipe with out creating an issue
Thanks

If it has a 7 inch pipe, I wouldn’t change to 6”.

[Zucker Lager]

When I moved inside my sugar shack I had to add 3 feet of 6" to my evaporator and now it pulls much more draft. I think like NhShaun suggests its a balance of flue diameter to length. For piping / fluids (combustion gas is a fluid) a reduction in pipe diameter will cause an increase in the flow speed jay

[DrTimPerkins]

For piping / fluids (combustion gas is a fluid) a reduction in pipe diameter will cause an increase in the flow speed jay

Physics are similar inside the tree as well. Sap flows faster around (but not through) non-conducting wood (stain) generated by tapping or other wounds than in areas without stain.

[buckeye gold]

I looked up a draft calculation and if I done it right you will need to increase your stack height by 3 feet if you go down to 6" pipe. This will maintain the same approx. draft.