Nozzle to Shell Inside Fillet Weld Leg

[NMP1306]

HI

I am designing pressure vessel as per ASME Sec VIII Div-1,having Nozzle passing thru vessel wall up to center line of vessel.
I have provide full penetration & fillet weld for Nozzle to shell attachment.
Is it mandatory to provide Nozzle to Shell Inside Fillet Weld Leg ?

 

[XL83NL]

Id sday no, unless calcualtions show that area replacement require them to be done to meet code requirements, or when the design envelope (drawings, calculations) provide such details as being mandatory.

 

[david339933]

Just to back up XL83NL's post.

Standard Designation: BPV Section VIII Div 1
Edition/Addenda:
Para./Fig./Table No:
Subject Description: Section VIII, Division 1, UW-16 and Fig. UW-16.1, Nozzle Fillet Welds
Date Issued: 09/24/1986
Record Number: BC84-169
Interpretation Number : VIII-1-86-89
Question(s) and Reply(ies):
Question (1): In Section VIII, Division 1 construction, is it acceptable to attach a nozzle neck that projects past the inner vessel surface [similar to Fig. UW-16.1 sketch (h)] with a full penetration groove weld and fillet weld on the outside only [similar to Fig. UW-16.1 sketch (c)]?

Reply (1): Yes.

Question (2): Would the use of the inside nozzle projection as reinforcement require an inside fillet weld?

Reply (2): No.

 

[NMP1306]

Thank you david339933 and XL83NL .

 

[DriveMeNuts]

If you are reinforcing the nozzle using Appendix 46 (Div 2 rules), then you need to use div 2 weld details (App 46-3(f)), which require that there be an inside fillet weld.
Even if you are using Div 1 reinforcement rules, if the vessel is experiencing fatigue service, the fatigue assessment will require that there be an internal fillet weld.