×
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

pad thickness and material

pad thickness and material

pad thickness and material

(OP)
Hi every body,

I would like to know why all the reinforcing pads attached to the shell should be as thick as shell or less with the same shell material?

thanks

RE: pad thickness and material

I'm not aware of such requirements.  Re-pad thickness should be fair game recognizing the limits of reinforcement cited in UG-40.  And the only stipulation placed on re-pad material is that it have an allowable stress value equal to or greater than that of the shell material, UG-41 (a).  You don't get extra credit for re-pad material having an allowable stress greater than the shell material.

Those are ASME Section VIII, Div. 1 references.

RE: pad thickness and material

There isn't an actual restriction on the thickness of repads other than not violating the maximum thickness for welding for the material in question.  I've heard what you are talking about before and use it as a rule of thumb for guidance, not a hard fast rule as I have more than once used repads thicker than host.  I have colleagues who have mentioned it helps avoid "local hard spots" that supposedly don't flex as consistently as the rest of the system.

RE: pad thickness and material

See Appendix L&G

RE: pad thickness and material

My reply is not replying why the re-pad should have the same thickness (local stiffness, etc), but why it is beneficial for the fabricator: I will have less steel wastage, because the pices from a cutting hole for a 24" mayway on the shell, I can use to reinforce a small nozzle on the shell and even heads. Bear in mind that heads can come up to be thinner than the shell required thickness. as I can have a 1 piece formed SE 2:1 head (100% joint effeciency) vs. a shell with different joint effeciency.

Kai

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