×
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

Obstructions through ducting?

Obstructions through ducting?

Obstructions through ducting?

(OP)
unfortunately, there is ductwork (say 8' square) in which a structural steel beam will diagonally penetrate.  try to imagine this scenario, an 8' square duct with a structural steel beam penetrating the duct at approx. 22-degree angle.  in other words, when facing square duct, the beam will enter duct at lower left corner of duct and exit duct at mid-height on the right side of duct.  lasty, the beam size is roughly 6-inch square.

that being described and i am currently investigating smacna duct construction stds and ashrae, can anyone provide any arguement (pro or con) justifying this design?  what design criteria (i.e. fig 2-8 in smacna duct construction stds manual) does the responsible individual need to address in the event that no alternatives are avaliable?

other considerations are OSA temps (-60 degF, is beam made of steel that can withstand -60 degF?), beam sealing, and performance issues.  but in this case, a relatively small reduction of air flow (or increased dP) is most likely insignificant.

it is my strong opinion that the engr(s)/designer(s) failed to conduct interference checks, and correct problem before progressing to construction phase.  but this belief is now a moot point.

smacna addresses obstructions, but vaguely and this obstruction is rather unique.

thanks!
-pmover

RE: Obstructions through ducting?

Obstructions do come during ducting and I can't make any comments with obligation point of view. However, you can Y the duct and again join it after the beam. You can keep each branch  with a cross section of 8'x4'.

I will never recommend exposing a steel beam to -60F.

Regards,

Eng-Tips.com : Solving your problems before you get them.

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