×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Generator Exhaust Piping
2

Generator Exhaust Piping

Generator Exhaust Piping

(OP)
Hello all.  First Post.  I have a problem with a generator exhaust pipe in a confined space.  The pipe exists the muffler with an ID of 10 inches.  My question is about a 90-degree sweep vs. a 90-degree fitting, and how much more back pressure will be given by the 90-degree fitting vs. the 90-degree sweep?  Am I really gaining that much by going with the sweep?  Also, is it that much trouble for a mechanical contractor to make the sweep?  I also thought about using two 45-degree fittings with some straight pipe to ease the turn.  Thanks!

RE: Generator Exhaust Piping

The back pressure question is really a question for the generator manufacturer. I've used a generator on a much smaller scale and had the same question. The generator manufacturer Onan indicated backpressure was a non-issue. This was for a 12Kw commercial generator.

For a contractor that has a welder and pipe fitter worth anything they should have no trouble fabricating a pretty elaborate pipe but do you need to?

RE: Generator Exhaust Piping

Not enough information, but if the exhaust ID is 10 inches at the muffler, this is probably a large machine and probably turbocharged and the sharp bend may affect it.  I glanced at a handbook and the losses in a tight bend are approximately 4 times that of a large radius bend.  Best to contact the OEM, they have charts/graphs/programs to calculate losses in exhaust piping

RE: Generator Exhaust Piping

Two 45's have more combined loss than one long-radius 90.  Each 45 is about 60% of a 90.

Depending on the overall system, it may be more advantageous and economical to simply upsize to 12" pipe than fabricate anything fancy...

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources