×
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

PWHT vessel manway in situ after repairs

PWHT vessel manway in situ after repairs

PWHT vessel manway in situ after repairs

(OP)
Hi All,

I have a vertical vessel 70 ft tall (60inch ID x 1" thk wall)where one of the manway is located almost 35 ft down from top of the vessel. We are doing some repairs on the manway neck and it would require PWHT due to service requirement. I am just wondering whether I need to support the vessel top section while we do PWHT on the manway or is it not required. Any directions from experienced pressure vessel engineer's as to how to evaluate would be great. My concern is that during PWHT the area around manway might undergo some deformation as there would be a constant compressive load acting downward while the manway area would be soften during heat treatment.
Manyway size is 20" and Temperbead is not an option.

Thanks in advance

RE: PWHT vessel manway in situ after repairs

How much welding did you do on the shell, repad, etc?
Or where was the actual welding?

What is the material?

Are you using a commercial heat treating company to do the work?

i would definately appraise them of your concerns.

Normally you can take out a good section out of of a column without any problems. It is hard to tell without drawings or sketches as what needs to be considered.

 

RE: PWHT vessel manway in situ after repairs

Quote:

Manyway size is 20" and Temperbead is not an option.

Please explain why this is not an option? Do you understand the temper bead method and the fact that it is endorsed by the National Board Inspection Code (NBIC) as an alternative welding method? A second option is to use local PWHT as described in the NBIC, Part 3 or Part RD. Using ASME B&PV Construction Code PWHT requirements in this instance can result in harm to an in-service vessel. I would carefully think this through before deciding on using a circumferential band for PWHT.
 

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