There could be one more problem if there are two thrust block in a straight line for mechanical joint that do not take care of thrust load ( by longitudinal stress) ( slip type joint) Caesar report will reflect huge thermal axial load , again if we manually added pressure*area load it might be a problem.
One way we can manage it just to put stiffness at mechanical joint points with Cnode
Like for pipe in X direction 20 is mechanical joint
20 Z with Cnode 21
20 Y with Cnode 21
20 Rx with Cnode 21
20 Ry with Cnode 21
20 Rz with Cnode 21
20 X with Cnode 21 Stiffness Zero ( or low vendor supplied value)

Pressure thrust( P*A) have to claculate manually & add at all change in direction.

Regards
Habib