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

Longitudinal stress criteria for dimentionning an offshore pipeline

Longitudinal stress criteria for dimentionning an offshore pipeline

Longitudinal stress criteria for dimentionning an offshore pipeline

Hello, I've been trying to handle a project in which I should determine the wall thickness of an offshore pipeline.
I've done this study according to ASME 31.4
In this norm after calculating the wall thickness we should verify three criterias: hoop stress criteron, longitidunal stress criteron and combined stress criteron.
My problem is with the longitidunal stress criterion. I didn't know how to determine the axial forces, in-plane bending moment and out-of-plane bending moment in the equations Page 12 in the ASME 31.4 Norm
Can anyone help me please?
Thnx smile2

RE: Longitudinal stress criteria for dimentionning an offshore pipeline

When looking at a pipe laying on the ground and curved in one plane only, an in-plane bending moment's deformation will change the radius of the curve. The out-plane bending moment will add a new bend radius perpendicular to the in-plane curvature, ie. a curve in the vertical plane. The last moment causes torsion about the axis of the pipe in whatever plane it happens to be in at the time.

Independent events are seldomly independent.

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


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