Recently, in asking about pipe diam/length and pressure drops for natural
gas, I was surprised at how significantly delivered gas volume drops with
length. For example, for 3/4" pipe, the cfh drops from about 350 to 250 to
200 for run lengths of 10, 20, and 30 feet. I"m wondering if this is even
correct.... from http://www.propane-generators.com/natural-gas-chart.htm
If this is indeed correct, I could assume the same is true of exhaust back
pressure with pipe length. The flange on the muffler is 1.5" OD (proly 1
3/8 id), and I want to put a 25 ft flexible exhaust extension on it, like in
and the Q is, what id tubing would be practical to use? The tubing is
given by id, so 1.5" should hose clamp to my 1.5" flange. But, I can go
larger, if back pressure will be an issue, and just machine a bushing.
The motor is a 22 hp Honda GX690, twin cylinder, with a single muffler.
Opinions on the "right diameter" for this run? Should I use a high temp
gasket material along with a hose clamp? I'll be monitoring CO.