Yes that is correct. The CNode/Anchor correctly models the welded connection on each end of the dummy leg.
However, you may have issues with that ambient setting of 21C. The reason is that the dummy won't expand to the same magnitude as the vertical "tee branch-valve" assembly. Is the dummy leg really going to be 21C?
If you don't get this right, you can have artificially high loads and moments in your CAESAR II analysis, that won't exist in the real system.
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Regards,
Richard Ay - Consultant