×
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

Tie rods/bars and lugs for axial restraint /support of a pipe joint

Tie rods/bars and lugs for axial restraint /support of a pipe joint

Tie rods/bars and lugs for axial restraint /support of a pipe joint

(OP)
I am trying to locate any standards or guidelines that specify the parameters for the use of tie bars/rods and lugs to restrain a pipeline against axial forces at a joint.

I can size the tie rods ok, but it is the sizing of the lugs that is my main concern. It is for metallic pipe, of very thin wall section, so I am concerned about the possibility of the welded lugs tearing the pipe wall under pressure and axial load.

I have tried searching the internet but seem to draw a blank. I don't know if I am using the correct terminology in my searches.

Can any point me in the right direction?
  

RE: Tie rods/bars and lugs for axial restraint /support of a pipe joint

B31.3 references the supports, hangers, rods design code.  MSS something.  Look in B31.3

Let your acquaintances be many, but your advisors one in a thousand'  ...  Book of Ecclesiasticus

RE: Tie rods/bars and lugs for axial restraint /support of a pipe joint

Definitely read B31.3, ultimately the design of the pipe supports, anchors, etc. will be the result of stress analysis.  You can always insert a larger schedule pipe if the analysis requires it. You may have to taper the transition by machining if the welds must be x-rayed as inspectors do not like to see discontinuities. "Doubler plate" reinforcement at the lugs may also work.

RE: Tie rods/bars and lugs for axial restraint /support of a pipe joint

MSS does not address local stress in much detail if at all.  You will probably want to start looking here:

WRC Bulletin 198
ASME Section III Div 1 Appendices Y-3000 and Y-5000.

WRC Bulletin 107/297 may help some as well, but they are usually adapted to Section VIII designs.  If you go with WRC107/297 remember to consider ALL longitudinal stress in the pipe!

WRC198 is probably the most straightforward.  WRC107 can be done by hand, but there's commercial software that speeds things up considerably.  The Section III stuff is a real chore.

- Steve Perry
http://www.linkedin.com/in/stevenhperry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered.  It is offered with the understanding that the author is not engaged in rendering engineering or other professional service.  If you need help, get help, and PAY FOR IT.

RE: Tie rods/bars and lugs for axial restraint /support of a pipe joint

(OP)
Dear BigInch, osoloco, and Steve, many thanks to you all for pointing me in the right direction.

Elbulldogio

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