Mep 803 exhaust pipe/extension

[fpchief]

I want to vent my exhaust out and away from the little shelter i will be building over it. It will not be fully enclosed however i would still not want the hot gas going directly into the cover. Is there a known source of supply for the correct pipe?
Kip

Sent from my SM-G930V using Tapatalk

 

[Light in the Dark]

You can use regular black iron pipe for this (its an NPT fitting). I forget if its 1" or 1.25" off the top of my head, but you just need a BI coupler and whatever length you want to extend the stack by.

 

[AfghanVeteran2010]

Is it a good idea or bad idea to insulate pipe as well?

 

[Dwnorton1]

1.25" and IMO it should be insulated. There is thread discussing pro/cons.

 

[Light in the Dark]

Is it a good idea or bad idea to insulate pipe as well?

I would say it depends on clearances (like a wood stove chimney). You will definitely need to fab up a pass through box (or find something for a pellet stove and adapt it) so you are far enough away from combustible materials. YMMV

 

[DieselAddict]

Insulation is your friend.

And bigger is not better.

 

[Dwnorton1]

Insulation is your friend.

And bigger is not better.

I would keep whole run in 1 1/4" and insulate all the way to or nearly to end. If run is too long pipe will cool then form condensation which will then run down your pipe. Not good...

 

[fpchief]

This run will be only a couple of feet. Building the shelter down close to the top of the generator. Will make it fairly nice and conducive to my house...same shingles on it...etc. now i am thinking about moving it, taking blocks out and building a wood platform under it like another member did.

Sent from my SM-G930V using Tapatalk

 

[Light in the Dark]

You should also consider putting a rain cap on the top of the pipe (example: https://www.amazon.com/gp/product/B0017LXW7E/ref=s9_dcacsd_dcoop_bw_c_x_1_w) but sized for the appropriate stock you use (I didnt check the sizing on that link... it was for illustration purposes only).

 

[Bmxenbrett]

Why not just extend the exhaust out horizontal? No rain cap to fail and no hole in your gen shelter roof.

 

[eatont9999]

I plan on running mine straight up, horizontal, pass through shop wall, and up again. I will put a rain cap on the end. My goal is to avoid putting a hole in roof so I don't have to worry about water leaks. I want the output exhaust up and away from the shop wall so soot does not deposit all over the outside wall. I'm also going to put a union joint about a foot off the generator in case I need to service the unit, I don't have to disassemble the whole pipe run. If condensate is a concern for you, add a T at a 90 bend and cap the bottom after a short length of pipe. Water will collect there and evaporate next time the pipe heats up. I don't see condensate as an issue for me. If it were a gas engine, I would expect more condensate.

 

[Dwnorton1]

A drip leg and union like you are describing is a great idea. I have read threads about using a flexible exhaust section just so you don't pass vibration into full exhaust stack.

 

[rosco]

I would sure use regular exhaust pipe for your extension. Schedule 40 water pipe is real heavy, especially when you start adding fittings like a union. Your Genney may be much smoother then my trusty MEP003, but it still shakes some, especially on start up or shut down. I used the 2 hole flanges often seen on Hot Rods, for disconnects. Sorry I can't find my pictures due to recently jumbled system here, but I've posted pictures of it before.

 

[eatont9999]

Dwnorton1, you have a really good idea there. I would hate for the exhaust flange to crack due to the weight of the pipe and the engine vibrations. A situation that is ripe for something failing somewhere over time.

As for regular exhaust tubing, I would need to compare the cost against iron pipe. I like the idea of a lighter weight run, though.

 

[boatman69]

I went with inch and a quarter 304 stainless. 3 inch nipple two couplings and a threaded cap. Merit brass on Amazon dirt cheap. Walker inch and 3/4 rain cap also Amazon cheap. I leave the exhaust completely capped off until it's time to run then unscrew the cap and screw on the rain cap that's attached to a coupling. The couplings are perfectly round and smooth almost looked machined but they are not.

 

[DieselAddict]

Photos or it didn't' happen!

It would be great to see how it looks when you're done.

 

[eatont9999]

I went with inch and a quarter 304 stainless. 3 inch nipple two couplings and a threaded cap. Merit brass on Amazon dirt cheap. Walker inch and 3/4 rain cap also Amazon cheap. I leave the exhaust completely capped off until it's time to run then unscrew the cap and screw on the rain cap that's attached to a coupling. The couplings are perfectly round and smooth almost looked machined but they are not.

Pics and part numbers if you have them, please.

 

[fpchief]

Here is the not quite finished exhaust. At least it will get out from under the shelter a little bit.

Sent from my SM-G930V using Tapatalk

 

[eatont9999]

Here is the not quite finished exhaust. At least it will get out from under the shelter a little bit.

Sent from my SM-G930V using Tapatalk

I attached the picture for you.

 

[fpchief]

I attached the picture for you.

Thanks, did it not show on my post?

Sent from my SM-G930V using Tapatalk