Perhaps I should add some more.

It's been a while since I took statics, so correct my misconception here.

Let's look at the portion of the CAESAR model above on the "inside" of the three anchors. The three anchors are situated onto the elements "outside" the elbow + trunnion junction, thus they're relaying forces from the rest of the piping (and support) onto the elbow + trunnion section.

Let's call the top connection V for vertical, the left connection H for horizontal, and the right connection T for trunnion.

I would expect to see that the sum of the forces should equal zero, since we're at a static state.
FVX+FHX+HTX=0
FVY+FHY+FTY=0
FVZ+FHZ+FTZ=0

I get Sum Fx = 1. Rounding error, I guess. Fine.
I get Sum Fz = -1. More rounding error, I guess. Fine.
However, I get Sum Fy = 248.

So I think the only way out of this is to apply an actual anchor in both models and state that this should be more conservative than reality. While an anchor point makes the CAESAR model fail, hopefully the FEA model will be fine.

Thanks in advance for any clarifications anyone can offer here.