×
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

duct support

duct support

duct support

(OP)
Currently analyzing an HVAC duct system in a nuclear facility (nuke waste) and curious if there is a standard method of determining the type/strength of supports.

Also, do typical HVAC supports restrain motion in the three orhtographic directions or do they restrain the moments about these axes as well?
Before you think that I am a fool, I realize that you want to allow movement in particular directions to allow for thermal expansion, etc.  In this circumstance we have a temperature rise of about 200degF...

RE: duct support

Standard HVAC ventilation ductwork is guided by SMACNA. Usually this entails sheet metal straps or threaded rod trapeze hangers. Local seismic requirements might have sway brace requirements, etc. Don't look to local building codes and standards to define needs for this application. NRC (Nuclear Regulatory Commission), CFR, or a military standard might define these requirements.

RE: duct support

Provide ductwork with adequate length on the hanger rods so expansion will not cause more than 15 degrees deflection of the rods from vertical. Provide bends to allow ductwork flexibility for expansion. Ductwork is not designed to resist moments. It is simply supported and diagonally braced where required to resist lateral motion from seismic, wind, forces or thrust.

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