I need to have expert opinions on SIF values for modeling two horizontal dummy supports supporting a vertical pipe.

Please enlighten...

Hi Ubaidullah

You may go for FEM to get more accurate SIF value.

Otherwise you may use ASME B 31.3 appendix D with some additional safety margin.
For trunion we do not remove any material like TEE so we already have some safety margin when we take SIF value as "Unreinforced fabricated tee"

Regards

Habib

The latest word on trunnions (as far as I know) is BPVC Code case N-392-3, Approval date December 12, 1994. It considers all the relevant stresses for such attachments.

Hi CraigB,

As from your reply, Code Case N-392 is for a ASME Section-III case, if we use ASME B31.3, then the allowable values compared with the ASME section-III varies greatly. So my opinion is that calculate the stress indices as per N-392 and check it against the ASME B31.3 allowable.

Please clarify your suggestions....