Maximum Gasket Seating Stress

Can anyone tell me what is the maximum seating stress for Ring Type Gasket ( Octagonal ring ) having SS soft iron with BHN 90 ?

As minimum seating stress is given in ASME that is 18000 to 26000 PSI, but maximum what would be ?? This is required to calculate the maximum bolt load for RTJ flange joint.

Thanks,
Hitesh Prajapati
LTC. [Non-text portions of this message have been removed] Received on Thu Dec 01 00:30:00 2005