Dear Experts,

We have received one of client's specification & ASME B 31.3 Appendix D requirement.


Specification shows that in order to have minimum stress concentrations at welding Tee, client wish to follow for all TEES ASME B 16.9.

Based on our study from the ASME B31.3 Appendix D, (Tee) Note 8 is given at Welding Tee (CAESAR Type-3) & Welded-in contour insert.

Note 8 shows that "if rx >_ 1/8 Db and Tc >_ 1.5 T,a flexibility characteristic of 4.4 T / r2 may be used".

I took the example from note 8 & try to calculate based on
h = 4.4 T/r2. the SIF (Out-plane)value is low, which also reduce the bending stresses.

However, CAESAR directly take as h = 3.1 T/r2,so its SIF(O) is higher than Note 8.

I need help from all of you, should we calculate separately this kind of calculations & take advantage to reduce SIF (O) & bending stresses?

Tee vendors / Manufacturers has to follow ASME B 16.9, as per Piping requirement. We can follow the diamention from their catalogs.

Dear Dave / Richard, share your experience for this quote, whether it is possible to follow or not?

Thanks

Regards
SND

There a configuration switch for this.

Thanks Dave,

Good that in CAESAR We have already this option available,unfortunately I did not notice.

Thanks once again.

To set up " TRUE" or " FALSE" based on TEE design,any other point need to check from stress engineer side?


Regards
SND.

For what you described, this is all you need.

Dear Richard & Dave,

Glad to get the same values of CAESAR & by my manual calculation.

Thanks both of you.

Regards
SND.