×
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

Industrial Duct Design

Industrial Duct Design

Industrial Duct Design

(OP)
I am designing a hot gas duct for a boiler exhaust. I am trying to determine what allowable stress to use for the meridional stress to prevent buckling of the duct. I have purchased "The Structural Design of Air and Gas Ducts for Power Stations and Industrial Applications" published by ASCE. It seems to tell me what to do, but not how to do it. I am looking at purchasing "Round Industrial Duct Construction Standards" published by SMACNA. This book is $340 so I want to make sure it is what I need before I order it.
Is anybody familiar with this manual?


RE: Industrial Duct Design

I think that talking to someone is going to be more beneficial than any book learning on this. I suspect that the SMACNA document is more for light gage forced air systems than for hot gas, large scale systems. The big power design companies do this all the time and what I remember from my 10 minutes of training on this was spanning the plates using one way action to the stiffeners, the stiffeners to the edges and use 21 ksi for everything (unless it was very hot, then reduce it). They combine snow with the gas pressures, which I could never figure out, but I guess there's an instant when the hot gas is blowing through the duct and the snow hasn't melted yet. Provide enough expansion for the temperatures of the gas.
I'd talk to someone who's done this before or try to pick the brain of an engineer at one of the big companies.

RE: Industrial Duct Design

JedClampett is correct...experience trumps ploghing thru the document you reference....from your post I assume it is round duct, if it is rectangular, then it requires a different approach...if round, the design is a blend of ASME theory but with lower FS depending on the press....also allow for thermal expansion...a usefull ref..

USEFUL INFORMATION ON THE DESIGN OF PLATE STRUCTURES
Steel Plate Engineering Data-Vol 2
Published by AISI, 1979

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