PWHT - Nozzle-To-Shell Attachment as per Fig. UG-40(b-1)

[Ganfoss2]

Dear all,

in case of Nozzle-To-Shell attachment in a configuration like that stated in Fig. UG-40(b-1) of ASME VIII-1 (Ed. 2007 an successive), whick is the definition of the "thickness" (t.PWHT) to be considered in PWHT CODE ASSESMENT (by CODE)?

Some Client/ASME Inspectors assume a "more conservative assumption" like:

t.PWHT = ( te + t.Shell )

others assume a "more light assumption" like

t.PWHT = MAX (te; t.Shell)

Please also refer to UW-40(f)(5)(d) - The source of the "dilemma".

NOTE: I was not able to find out any "clarification" on this issue, nor any "interpretation".

NOTE: some time we "shift" the nozzle-to-shell details to that shown in Fig. UW-16.1(h) of ASME VIII-1: thsi detail is classified as a FULL PENETRATION WELD ATTACHMENT (in this way, t.PWHT become clear and univoque).

See also Par. UW-16(c)(2)(d).

Does someone have more experience to share on this issue?

Many thanks in advance.

ANN

 

[metengr]

The definition of nominal thickness for PWHT of ASME Section VIII, Div 1 fabrication can be found in UW-40 8(f) 5 (d).