Hi Habib,
problem is movement over 330mm, support not designed as per stress analysis,now pipe shoe came out of supporting member.so in last 8 supports full shoe came out of beam and pipe sitting directly in beam.then remaining supports moved corresponding to thermal expansion and sits in beam.so site people says in mid of line(170m) they have some break flange so they can introduce a bellow over there.based on the movement some other piping also fouls with respect to the main line branches.
so now they want to put a bellow and want to avoid movement from 330 to 150mm.so only i am analyzing with bellow,but for me anchor point load come nearly 20ton to reduce i adjusted the axial stiffness is this method is correct.
main consideration is avoiding hot work.but they gave some limit to do hot work not much.