Hi TGS4, Thanks a lot for your reply. What confusing me is the allowable stress for design, not for service. In VIII-2 , part5, 5.7.1, flange and bolt should be evaluated per 4.16. Do I only use 4.16 formulas and use Tabel 4 allowable stressees or need to use Table 3 stresses?
Thanks
Kuan