CAESAR II (and PVElite and CodeCalc) implement the rules of ASME Section VIII Division 1 Appendix 2 for the flange computations. It is standard industry practice to use "Peq" instead of "P" in the appropriate Code equations.

Quote:
The "gasket seating" results and "operating condition" results must be practically the same for a very small pressure value as load.


Why?

To help explain the results please download the ZIP archive here. In this archive is a PDF of the Taylor Forge (Example 1) document, this example as run both CodeCalc and CAESAR II. (The CodeCalc document includes equations with substitutions so you can see exactly where all of the values come from.)

Also included in this archive is a second job (TayorForge2) where the pressure has been reduced from 400 psi to 1 psi. Note the seating bolt stress does not change, while the operating bolt stress does.


Attachments
438-FlangeExample.zip (1529 downloads)

_________________________
Regards,
Richard Ay - Consultant