Using PV Elite 2012 (Build 120101)
ASME Code Version: 2010 Edition, 2011a Addenda

If we create a nozzle in Division 2
Nozzle Attachment "Hub Type Self-Reinforcing"
and press the Button [Obtain ASME Bevel Angle] We get always an angle of 45 degrees, but there seems to be no code reference for this 45 degrees!?

Referring to the (2011a) Code:
1.2.3 Geometric Scope of This Division
a) 1) The welding end connection for the first circumferential joint for welded connections (see Table 4.2.4)
in Table 4.2.4 I find in Detail 4:
"Taper" a>=3b, that means angle <= arctan(1/3)=18,43°

Additional, taking account to Figures 4.5.2 and 4.5.13 + 4.5.14, the taper is illustrated as 1:3.

Remark: in 2010 add. there was some mistiness about calculating area A2, in 2011a the A2 is splitted to A2a, A2b, A2c.