Is there a connection like UW-13 for direct connection of Body flange to spherical heads? 1

[goutam_freelance]

Please see VIII-1 MA1 Fig 1.6 for permissible types of bolted dished cover joints.

Please ignore Mandatory Appendix 2(Flanges), Fig 2-4 shown above as it is for bolted piping joints (apologies).

 

[r6155]

Once more you are wrong

IT SEEMS IMPOSSIBLE for you to understand what the OP says in his NOV 2 sketch: the body flange is a WELDING NECK, it is full penetration butt weld !

 

[goutam_freelance]

Referring to Fig MA1 Fig1.6, the weld type indicated by OP may not be covered by code.

Also, Type C( bolted dished end ) connection needs to meet additional requirements of weld due to bolt forces and moments, refer MA1, Cl. 1.6.

 

[r6155]

@ goutam
You are very confused.
I'm sorry to tell you, but I suggest you take some pressure vessel training.

Regards

 

[goutam_freelance]

@r6165

I do not agree. However you can disagree as you have the right to do so even though there may be some impediment here.

I stop this here as nothing will come out of this from me more than what has already been said. Anyone can leave it or take it.

 

[jt1234]

Wrong r6155

 

[r6155]

@ jt1234

Again, you are not helping the OP.
Do you have any experience with the OP issue?

 

[Cobra17]

Why does UW-3(c) reference connecting flanges to formed heads, and per UG-32, hemispherical heads are considered formed.

UW-3(a) says any welded joint within a formed head is Cat A, and specifically states circ joints to the main shell, transitions in diameters , nozzles or communicating chambers.

Where UW-3(c) says flanges to flat heads, formed heads, transitions in diameter, nozzles or communicating chambers? did they leave out flanges in UW-3(a)? probably not because its covered by UW-3(c).

(a) Category A. Longitudinal and spiral welded joints
within the main shell, communicating chambers, transitions
in diameter, or nozzles; any welded joint within a
sphere, within a formed or flat head, or within the side
plates of a flat‐sided vessel; any butt-welded joint within
a flat tubesheet; circumferential welded joints connecting
hemispherical heads to main shells, to transitions in
diameters, to nozzles, or to communicating chambers

(c) Category C. Welded joints connecting flanges, lap
joint stub ends, tubesheets, diffusion welded plate packs,
or flat heads to main shell, to formed heads, to transitions
in diameter, to nozzles, or to communicating chambers
any welded joint connecting one side plate to another
side plate of a flat‐sided vessel.


UG-32 FORMED HEADS, AND SECTIONS,
PRESSURE ON CONCAVE SIDE
(a) The minimum required thickness at the thinnest
point after forming of ellipsoidal, torispherical, hemispherical,
conical, and toriconical heads under pressure
on the concave side (plus heads) shall be computed by
the appropriate formulas in this paragraph

 

[r6155]

@ Cobra17
a) You are one of those who gets confused with a hemispherical head
b) Have you ever seen how a hemispherical head is made with a diameter of 500 mm or 3000 mm, for example?
c) Did you see my post Nov 15?

Regards