×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Longitudinal stress criteria for dimentionning an offshore pipeline

 Forum Search FAQs Links MVPs

## Longitudinal stress criteria for dimentionning an offshore pipeline

(OP)
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

### 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.

#### 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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!