×
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

Weld spacing- Nozzle to circ. seam

Weld spacing- Nozzle to circ. seam

Weld spacing- Nozzle to circ. seam

(OP)
I'm looking for the minimum distance required between the edges of a vessel circumferential weld and a nozzle attachment weld per ASME VIII, Div.1
From UW-14, it would seem that there is no requirement for a nozzle of a size that is out of the scope of UG-36(c)(3). Per UW-14(a), any type of opening that meets the reinforcement requirements of UG-37 can be located "in" a welded joint, so does that mean also that adjacent welds could be as close together as desired (even if they do not overlap)?  The only place that I could see a minimum spacing requirement was UW-14(d) which requires welds to be spaced 1/2" apart.  But again, that refers only to openings meeting UG-36(c)(3), and it is for thicknesses up to 1.5" ... what if it is thicker?
The particular case I am dealing with is a 4" vessel wall thickness and a 24" diameter manway neck.
Any thoughts would be appreciated.
Thanks in advance,
Tom W

RE: Weld spacing- Nozzle to circ. seam

There's no Code restriction to putting a nozzle through a weld seam except that you'll need to radiograph the seam on each side. There are however many client specs that will not allow this and generally should be avoided in any case. Twice the shell thickness is a rule of thumb.

RE: Weld spacing- Nozzle to circ. seam

While there are no specific rules for this, but "twice the shell thickness" rule (of thumb) seems too much for your case (Shell thickness 4-inch).

I remember a client's specification which demanded a distance of 50 mm between toes of adjscent welds. Sounds reasonable for your case.

RE: Weld spacing- Nozzle to circ. seam

(OP)
Thanks for the input, I appreciate you taking the time.  This confirms what I was thinking.  I just wanted to make sure I wasn't missing something.
Thanks again,
Tom W

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