For what stand-out length of nozzle does this requirement apply? For what outer length a nozzle is still been defined as a nozzle?

May I assume that minimum nozzle length is defined by UG-37 Limit of Reinforcement (2.5t or 2.5 tn+te)? Beyond that length – may I refer only to UG-27 and reduce the thickness accordingly?

Dear Mr. Shmulik.
Kindly, elaborate your question deeply. As, i am not able to judge what do you ask.
I roughly estimating - You are Designing Self Reinforced Nozzle, isn't it?
Then, UG-45 is applicable for Nozzle neck THK. HUB THK & Length for Self Reinforced Nozzle as per UG-37.
Kindly, Note that for case, where HUB length = 2.5Tn + Te is governing. Tn may very from Neck THK to HUB THK depend upon your length of HUB, refer Fig. 40 (e), (e-1), (e-2).

Regards
Vishal Tailor

Hello Mr. Tailor,
Thank you for your reply.

Yes, I'm dealing with a self-reinforced nozzle, but my query is not for the rules of self reinforcing. I'm asking about the thickness beyond self reinforcing area.
Please refer to FIG. UG-40 sketch (e-1): does "tn" still must have the minimum thickness of UG-45?
As I may understand from your reply – your opinion is it doesn't. That was also my opinion.

The core of my query: is there any linkage made by the code between UG-37 limit of reinforcement and UG-45 minimum nozzle thickness?

Dear Mr. Shmulik.

You must note the applicability of ASME Code. Code's rule shall be applied upto first circumferential joint for nozzle to pipe. Therefore, you have to select all dimension accordingly.
Also note that UG-45 is not applicable for HandHole & Manways.

Regards
Vishal Tailor

vishaltailor,


UG-45 is applicable to handholes and manways. Read UG-45(a)..."including access openings and openings for inspection"

Dr. Chris
Thank you for pointing out goof point. I am agree with you. UG-45 (a) in applicable for Access opening & opening for inspection, however, Ug-45(B) is not applicable for Access Opening & Inspection. I also would like to share following :
as per UG-45 (C) Shear Stress in Nozzle Neck to be calculated. Pl. note many of Pressure Vessel Design Software not perform this calculation. Normally, i experienced that Shear stress comes less then allowable, however, it's mandatory requirement as per code.
Additionally entire structure for UG-45 is changed in Ed 2010 & more elaborated. Additional design check under ta is added, as per this design check Nozzle neck thk to be determine considering pressure plus external load forces & moment.

Nozzle thickness should not be less than the maximum of followings.
i. Minimum thickness required by UG-16
ii. Minimum thickness rquired by UG-27
iii. Minimum thickness required by UG-45.
IMDAD H SHAH

shmulik,

Specific answer to your query is that "UG-45 thickness is applicable to complete length of nozzle." I dont understand why are you mixing reinforcement limit with UG-45 thickness.

Thanks.

mbc.engg,

Core of my question was aimed exactly to this prefix: "a complete length of nozzle".
For what outer length a nozzle is still been defined as a nozzle?

I suppose we may agree that a pipe connected to a pressure vessel and treated by PV code as a "nozzle" (except of an access opening) is about to connect the vessel to a pipe system. The question was: where the "switch" point is? From which point we are allowed to design this pipe acc. to UG-27 or acc. to the relevant piping code instead of the PV code?

It was clear to me that "switch" point is not allowed to be inside of self reinforcement area as it "belongs" to the vessel and shall be the min. outer length of the nozzle.
How should we consider this pipe from that point on?

Up to first flange joint, ASME Pressure vessel code will be applied. Then after you can apply piping code...

mbc.engg

Why said up to a "flanged joint"?
How about butt welded nozzle with no flange connection?
Is there any definition for a nozzle to be ended with a flanged joint?