Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations Danlap on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Is there a connection like UW-13 for direct connection of Body flange to spherical heads? 3

The CODE is not a handbook.
 
Circumferential welds to hemispherical heads are considered a Category A joint due to the acting stress over that weld. In the case of semieliptical 2:1 heads, the longitudinal stress (half the governing stress) would be acting over a circumferential weld. This is not the case for hemispherical heads, which is the reason why it becomes a Category A weld detail when the head is hemispherical in lieu of Category B when it is semielliptical 2:1.
 
Cat "C" or "A" ? It is "C" which is considered as an integral forging/machined piece welded to plate. and which can have less stringent NDE requirements than A or B as indicated in many vessel specifications from oil companies or engineering firms.
Even the forging piece will be tapered and machined to match the head for welding purpose, it is still an integral forging piece and the weld is "C" per Fig UW-3.
 
The hemispherical head only has category A, the semi-elliptical head has category A and B
 
As is evident from Fig UW-3, Type A joints have hoop stresses (and radial stress at the inside surface) mainly.

But Type-C welds with flanges will have hoop stresses, radial stress as well as stress due to bolt tightening.

This is the main difference.
 
@ goutam
Absolutely NOT
.
My drawing (Nov 15, 2024) is clear and easy to understand, but you have serious problems understanding drawings and the Code- The same for jt1234
Sorry.
 
@r6165

You do not have any answer to my post but only repeating what you said before. I have serious doubts about your background.

Sorry!
 
@ goutam
"I have serious doubts about your background."

This is your problem.
You have doubts about several things. You need more reading.
 

Part and Inventory Search

Sponsor