×
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

Level Spud Reinforcement Calcs

Level Spud Reinforcement Calcs

Level Spud Reinforcement Calcs

(OP)
When a level transmitter spud (its thickness greater than the head or shell into which it is welded) is welded into an ASME pressure vessel, would this spud need reinforcement calculations per UG-36(c)? I question this because the spud will always be plugged or have transmitter installed, thereby becoming one unit.

RE: Level Spud Reinforcement Calcs

loc23-

Probably not. As long as the cutout in the head or shell is less than 2 3/8" you'll be exempt from reinforcement calc's per UG-36(c)(3)(a), and it would be an unusual level transmitter which would require a larger connection. The thickness of the attached nozzle doesn't enter into the reinforcement reuqirement exemption.

My definition of a spud (see, for example http://www.wfi-intl.com/ and go to "products" and look at "flanged pipet")may vary from yours; we only use them on piping. I'd use a long weld neck nozzle for level instrument connections in vessels.

jt

RE: Level Spud Reinforcement Calcs

(OP)
This spud is similar to a "Rosemount" sanitary spud for a differential pressure transmitter. It is 5.98" od and has an o-ring seal at the inner face (vessel side). So the hole in the head is much larger than 2.375".

RE: Level Spud Reinforcement Calcs

It will require reinforcement calculations.  It may or may not require any additional reinforcement.  Suggest you contact your vessel designer or fabricator.

The fact that the hole is always filled is immaterial; the stress is not carried by the plug part but by the outer frame.  The thickness of the item wouldn't exempt it from reinforcement calculations, but may make the fitting self-reinforcing, where no additional reinforcing plate is required.

You may need to radiograph, hydrotest, etc., after welding it in, as well.

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