Natural Gas-Driven Emergency Generator Exhaust
Natural Gas-Driven Emergency Generator Exhaust
(OP)
Hi,
Does anyone know the purpose of the conical shaped device located between the generator and the silencer?
Thanks.
Does anyone know the purpose of the conical shaped device located between the generator and the silencer?
Thanks.





RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
What you see at the top is some sort of cap, about the size of a garden hose.
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
Thanks for your help!
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
rmw
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
but if this thing is supposed to be a venturi, it doesn't look like one that would work very well. I'm not liking the step change in diameter upstream of it, and unless the side tube curves inside the device to get to the throat, it's not getting the suction.
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
The first "step reducer" is actually a spoolpiece hand-made after original de-construction to replace a removed valve or fitting or adapter/tee/pipe section. This removed pipe section would have fit between the first large flange on the right and the same size flange on the venturi inlet.
RE: Natural Gas-Driven Emergency Generator Exhaust
Pipe diameters keep getting smaller !!! if start from the right and go left, but you'd want your exhaust to get bigger (or stay the same at least) to improve efficiency of the flow.
Sudden start/stops, changes in diameter for no (now) good reason, sharp bends and decreasing pipe sizes screw up flow big time.
Replace the whole thing, starting at the reducing street elbow at the first bend. Use long radius elbow, as big a NEW pipe as you can afford, and as straight a run as possible.
RE: Natural Gas-Driven Emergency Generator Exhaust
Thanks to all for your help.
We are replacing all the exhaust piping and silencer. 2" for each manifold. 4" silencer and main to roof.
I was just curious what it was, never saw one before.
Thanks again.
RE: Natural Gas-Driven Emergency Generator Exhaust
Alt: Use a 2 x 2 x 4 Tee
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
Mike Halloran
Pembroke Pines, FL, USA
RE: Natural Gas-Driven Emergency Generator Exhaust
RE: Natural Gas-Driven Emergency Generator Exhaust
On his budget no less!
PS. Merry Christmas to all. Robt
RE: Natural Gas-Driven Emergency Generator Exhaust
24 Dec 09 23:34
I could swear that it's a commercial _something_, that I have seen before, not a homebrew something ... but I can't remember what it is.
Mike:
I have worked with oil system check valves that are built similar to this cone + flange setup: The flapper is mounted on a central flat plate ( same size as the pipe flange) mounted between a cone and the inlet pipe flange. The flapper swings out into the space provided by the cone, swinging on two mounts at the top.
RE: Natural Gas-Driven Emergency Generator Exhaust
Just a suggestion, still not sure what the purpose of the backpressure would be.
RE: Natural Gas-Driven Emergency Generator Exhaust