That is when the tie rod is in tension and resisting the pressure thrust, maybe the pressure thrust will be eliminated..

1.How about when the piping will compress the bellows? what are the forces that will act on the nozzles? how do we threat the pressure thrust if that is the case?

2.If I will design the pipe with an untied single bellow with a directional anchor on the adjacent side to resist the thrust force, I think it will be the same as with the tie rods.

Now my other concern is how to interpret this results in CAESAR II? since the pressure thrust will not be absorbed by the nozzle but the restraints and the equipment anchor. When I entered the Effective ID, there is a remarkable amount of load at restraints and nozzle.