AMSE Appendix 2

[gbellx]

Does anyone have any insight into the logic for the flange stress limits and stud sizing in Appendix2 of the ASME code? If you look at a standard TEMA flange in the 1000 # range, the stress limit for the flange, Sh, seems to correspond with a little more than 25% of yield for the studs. Is that typical?

 

[prex]

Can you be more specific on what you are wandering about?
The limit for S_H is 1.5S_f (in most common situations) and this can be close to but never higher than yield stress for flange material. Bolt material is a different matter, why should you compare its yield stress to that of flange material?
The rationale behind App.2 is that membrane stresses (S_R, S_T and bolt stress) are limited by the allowable stress in tension, and membrane+bending stresses (S_H) are limited by 1.5 times the allowable stress in tension.
prex
motori@xcalcsREMOVE.com

http://www.xcalcs.com

Online tools for structural design