×
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

2-inch Pipeline deflection

2-inch Pipeline deflection

2-inch Pipeline deflection

(OP)
Can someone please help me with this question? I have been trying to solve it but I have not been succesful. ponder

What is the maximum deflection of 2-inch pipe in number of degrees (maximum deflection in number of degrees that the longitudinal axis of the pipe may be permanently deflected in any length along the pipe axis equal to the diameter of the pipe)?

Pipe description:
Carbon Steel, Schedule 80, wall thickness 0.218”, MAOP 2500 psig.

Thank you in advance!

RE: 2-inch Pipeline deflection

Hi npao:

Deflection as I know is a dimension, not angle, you can calculate the deflection angle when you know deflection and the span of pipe. Now, the angle = arctan (deflection)/(span/2). For max defelction you have some criterias, for power piping B31.1 0.1 inches & for process piping as Kellog 0.5 in to 1.0 inches.

B regards,

LFC

RE: 2-inch Pipeline deflection

(OP)
Thank you for the response. I apologize for the lack of clarity in the question, I will try to better phrase it.

This question came about a project where 40' lengths of pipe is being welded together, and now that the contractor is getting ready to lay it at the bottom of the ditch. 2" welded pipe is flexible however it will have stress areas because they did not manually bend the pipe.

So I now need to figure out how many degrees can the pipe flex (self bend) before is requires mechanical bending?




RE: 2-inch Pipeline deflection

Now I understand your question, so it is neccessary to calculate the stress for a specific condition, like span between footholds, allowable stress can be assumed like 2750 psi as Kellogg, and then calculate the deflection nad then angle of deflection. In an excel you can make fast and easy the calculus. It is neccessary to iterate the result.


B. Regards

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