×
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

Dent before Cold Bending Pipe

Dent before Cold Bending Pipe

Dent before Cold Bending Pipe

(OP)
In a pipe line gas under construction (1440 PSI design pressure), a double joint pipe 42” and WT 0.601” was bent in a cold bending process. Indications were not encountered in the curvature area, but a dent of 3/32" depth in an area no larger than 2” square and close to neutral axis was evidenced. This dent was difficult to observer because was covered by the factory coating.
According to ASME B 31.8, 841.2.3, should the pipe be accepted?

I appreciate yours comments.

RE: Dent before Cold Bending Pipe

What does 841.2.3 state???

RE: Dent before Cold Bending Pipe

So the kink was in the neutral axis (side) of the pipe, not the intrados?
How did they do that?

Is the kink "in" or "out" of a theoretical round?

RE: Dent before Cold Bending Pipe

(OP)
Thanks for your interest.

I want to be clear saying that the dent no was originaed by the bending process, and it was evidenced in the side of the bent (close to the neutral axis).

According to ASME B 31.8, 841.2.3, just at state (a) (1), must immediately the pipe be rejected? , if not, as it was evalueated according to ASME B 31.8, 841.2.4, (c), should the pipe be accepted?

RE: Dent before Cold Bending Pipe

If the dent does not effect flow and no cracks are present from surface NDT leave it alone.

RE: Dent before Cold Bending Pipe

(OP)
It will be so.

Thanks metengr.

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