As soon as the weather breaks, I'm going to start my 28'x32'x10 garage (pole barn) project. I'm going to insulate the walls and ceiling, finishing with drywall. I want to heat with a 45k btu forced air furnace. The issue is, I don't know if a 1/2" line at 120' will be enough gas pressure for the furnace to work properly. Any suggestions?
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Need Help Determining if 1/2" Gas Line is Good Enough
- Thread starter Sygheric
- Start date
sands35
Well-known member
http://www.endot.com/OpenFile.aspx?path=21eb7_0.pdf&Type=1&pid=34
You need 3/4" for nat gas.
LP it will be fine.
If you ever wanted to stub out another device (generator? Grill?), over sizing the line is OK and doesn't cost that much more.
You need 3/4" for nat gas.
LP it will be fine.
If you ever wanted to stub out another device (generator? Grill?), over sizing the line is OK and doesn't cost that much more.
koditten
Well-known member
You will be running 1 inch and reducing it as it enters the building. I got no issue running my 75k furnace. I have 185' between the house and shop.
Diesel Dan
Well-known member
1" gas pex is cheap enough.
It is the risers that are expensive.
It is the risers that are expensive.
Let's see....I've got the 2012 edition of NFPA 54 here in my lap and using polyethylene plastic pipe at 125' with 1/2, 3/4 & 1" you can expect 51,103 & 185 kbtu respectively at .5" pressure drop with NG. With fittings and the expectation of adding load sometime in the future I'd do 1". Better to have the extra capacity and not need it than need it and not have it!
TractorJeff
Well-known member
Remember once he gets there with the pex, then changes to iron, first elbow will need to be calculated as a pressure drop and every one after that. Even the iron through the building will be a slight pressure drop due to rough interior verse Pex.
BillK
Well-known member
I don't understand why you would not just call your gas company and ask them ???? I am thinking about doing the same with my detached garage and Washington Gas will be who I call. I would think they would gladly give you the correct answer and I would hope they would be the experts in the matter ?