Hi All,

I am doing a riser modelling analysis and run the following cases:-
(1) LC = W+P1 (weight + internal pressure, 120 barg)
(2) LC = P1 (internal pressure, 120 barg)
(3) LC = T1 (content temperature, 65 deg C)
(4) LC = W+P1+T1

I have the following observations which i do not understand.
1. The global element forces & moments for all nodes are the same for case (1) & (2).
2. The global element forces & moments for case (2) is zero for all nodes.
3. The addition of global element forces & moments for case (1) & (3) is not the same as case (4).

Please advice.