×
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

API 653 Repiar of Caustic Tank

API 653 Repiar of Caustic Tank

API 653 Repiar of Caustic Tank

(OP)
We are replacing a manway insert on a 40 year old carbon steel API 650 storage tank.  The tank has been used as a White Liquor (Caustic) Storage tank.  

I'm concerned the inner shell to insert weld will fail due to caustic embrittlement of the shell material.  Any suggestions as how to avoid this?  

RE: API 653 Repiar of Caustic Tank

Are you concerned with the present condition of the shell plate causing problems, or with future caustic embrittlement?

Do you know if anything was done on the original tank to avoid this problem?

You should be able to stress-relieve the weld in question, if that would eliminate the problem.

RE: API 653 Repiar of Caustic Tank

Yes stress relieving is the way to go. If you can't stress relieve the weld get a welding engineer to write up a weld procedure that minimises residual stress.  You will have to use small weld runs with low hydrogen low heat electrodes, so that each run tempers the previous run.  Use a low yield electrode for the outside welds and grind off the final capping run with a flapper disc.

RE: API 653 Repiar of Caustic Tank

If the tank can be used over 40 years before repair, you should refer to the original WPS.

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