×
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

Replacing column nozzle with patch plate?

Replacing column nozzle with patch plate?

Replacing column nozzle with patch plate?

(OP)
I have a project where we need to increase the size of an existing nozzle in a column. This nozzle with be larger than any nozzle originally supplied with the column so it will be an alteration rather than a repair. The plant had done this previously approx. 15 years ago and at that time they cut out the existing nozzle, enlarged an opening, welded in the new nozzle, and then welded in a pipe cap to inner shell so they could do a 'local' hydrotest.

The contractor is offering to do this alteration by making a patch plate with the new nozzle installed where they would do a similar hydrotest, but in the shop vs. the field.

It should be noted that the original vessel shell used SA 212 B material, which has been disconntinued 30 or more years ago. I believe SA 515 70 is the replacement material for this. They want to use SA 516 70.

The nozzle will require a reinforcment pad.

My questions:
Is this 'patch plate' alteration procedure allowed by code? If so, should they do full radiography of the shell welds?
What are the issues, if any, of using the different shell plate material?
Would they need to follow the same weld procedures as original?

Any comments / clarifications would be helpful.

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