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


<b>How to do Rectangular Flange Design?</b>

<b>How to do Rectangular Flange Design?</b>

<b>How to do Rectangular Flange Design?</b>


i had gone through the ASME code book to find the procedure for the bolted retangular flange design (integral type), but couldnt find it. please any one can help me as where i can find the procedure for this design. help needed quick!!.

RE: <b>How to do Rectangular Flange Design?</b>

When I was faced with a rectangular flange design this was the approach I adopted.  It was very low pressure and a soft gasket.  If you have high pressure you have to give the problem very serious thought because Square and pressure don’t go together !

Take the rectangular circumference or perimeter of the flange at the bolts. Consider the flange to be circular with the same circumference.  

Consider a 10 x 5 flange,  perimeter = 30, Area = 50
Therefore  Equivalent circle Dia = 9.5 Area = 71

Reduce the design pressure by the ratio of the two areas
Equivalent Pressure = Design Pressure x 0.704
Calculate as a round flange using the equivalent pressure.

It may also be a good idea to draw the flange and divide its area into the individual rectangular pressure envelopes acting on each bolt and take the worst case area.  Divide up the equivalent circle (dia 9.5) by the number of bolts, if this area is less increase the equivalent design pressure accordingly.

Unfortunately this analysis assumes the flange to be a ring, which it is not.
Consider the flange to be a cantilever with the bolt loads applying the bending force.
Then consider the pitch between bolts as a built in beam subject to its share if the pressure area. You should also consider defection as this may cause the flange to leak.

Do a mock up and test your design. If you need to comply with the ASME code you may have to do a burst test.

Have fun

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! Already a Member? Login


White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close