I have two questions;
1- Shall “modeling a trunnion on a straight pipe in CAESAR II as a welding reinforced tee” be a fair approximation to check local stresses?!
My concern is what SIF I should apply at StriaghtPipe-Trunnion intersection. Please advise.
2- What temperature should be applied at the trunnion?! Is it going to be the same as the header?!
Thank you

1) You don't need to apply an SIF here, you haven't cut a hole in the pipe.

2) Maybe, it depends on the state of the insulation, how hot the pipe is, how long the trunnion is, etc. I don't think there is a definite answer to this one.

It is preferred to check the trunnion local stress OUTSIDE of CII. Use the loads from the CII output and perform the local stress calc by the "line method" or other means.

Richard

"1) You don't need to apply an SIF here, you haven't cut a hole in the pipe."


However, assuming the trunion is attached to the main pipe by a fillet weld all around, which according to ASME Table D300 will have SIF of 2.1 ( for fillet welds) max.

Please clarify your statement.

Thanks

The Code does specifically address this geometry. I do not believe the Code SIF should be applied at this location to increase the bending stress component of the Code Stress.

But you are correct, there is a weld there that "may" reduce the strength of this connection.