×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

STRESSED BRANCH CONNECTIONS, NEED EXPERT's OPINION

STRESSED BRANCH CONNECTIONS, NEED EXPERT's OPINION

STRESSED BRANCH CONNECTIONS, NEED EXPERT's OPINION

(OP)
Hi Experts
I am practicing stress on this cold flare simple line of Sch. 10S but the problem I am facing here is at branch connections, each branch connection is stressed more than allowable, I am trying to control it by changing type of supports but no luck. Need expert’s recommendations for attached CAESAR II file, stressed node numbers are also provided.
Thanks



RE: STRESSED BRANCH CONNECTIONS, NEED EXPERT's OPINION

Bigger connections then a reducer. So a 4" weldolet then a 4 x 2 reducer for e.g.a 2"branch connection

What sizes?

Or brace the connection to the main pipe. This one is a bit extreme, but gives you the option commonly used.





Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: STRESSED BRANCH CONNECTIONS, NEED EXPERT's OPINION

(OP)
Thanks, but here some tees are equal of 8" and some are just reducing 8x6". How to manage stress in this case?

RE: STRESSED BRANCH CONNECTIONS, NEED EXPERT's OPINION

Where's the differential movement coming from?

Is the header moving or the branch moving?

Guides? supports? anchors?
I can't read C2 files so you need to post some more exact drawings of what your system looks like.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: STRESSED BRANCH CONNECTIONS, NEED EXPERT's OPINION

The problem you're facing is that this model is a complete mess.

You're imposing arbitrary movements at your connections along the branches (nodes 1411, 1491, 5411, 5491) with no flexibility to absorb those movements.

Along the branches, you have multiple directional anchors in-line with each other (1341 against 1371 against 1451) and (5341 against 5351 against 5431 against 5441 against 5501). You can't have anchors in line with each other like that without expansion loops in between them.

Instead, you should have no more than one anchor on those two branches, and they should be located as close to the header to push expansion away from it.
Nodes 10 to 100 are what I'm calling the header and the branches are ones with the node ranges in the 1300-1400's and the 5300-5400's)

You're not going to fix this with supports, it needs to be flexed up.

Edward L. Klein
Pipe Stress Engineer
Houston, Texas

"All the world is a Spring"

All opinions expressed here are my own and not my company's.

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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