ASME VIII-1 Appendix Y Theta A/B/rb Slopes

[takio]

Hello,

I would like to ask a questions below.

Is there a typical assumed values for these? I just used "0",thinking that it's ideal situation.

θA = slope of flange face at outside diameter, rad
θB = slope of flange face at inside diameter, rad
θrb = change in slope which flange pair undergoes
due to an unbalanced moment, rad

Thank you for your time.