Hi,
I have a line coming from a reactor (450ºC), and with slug.
Due to the slug it si supposed to have a line stop in a horizontal run it has justa before the inlet nozzle. But I am high enough in the structure to have big seismic desplacements to take in account. I would like to place a snubber for those steel desplacements. I have searched some post about snubbers, and I found this:

So what can be done? I suggest the following approach…
1) Place a node(s) where the snubber(s) is to be attached to the system.
2) Run the required operating cases i.e., W + T + P + (F for spring can if req'd) + D (if req'd)
3) Note the displacements linear and rotation that occur at the snubber node(s).
4) Call out snubbers attaching them to the piping node(s) and then cnode them to a fictitious node.
5) Then go to the displacements input screen and input the operational displacements for the cnode.
6) Finally set up your load cases….
CASE 1 (OPE) W+D1+T1+P1

CASE 2 (SUS) W+P1

CASE 3 (OCC) W+D1+T1+P1+U1(Case for algebraic summation)

CASE 4 (EXP) L4=L2-L1

CASE 5 (OCC) L5=L3-L1 (Results in U1 loads/ stresses alone)

CASE 6 (OCC) L6=L2+L5 (Weight + Pressure + U1 loads)


My doubt is if I could consider the movement of the structure as the displacement to give to the CN associated to the snubber node..., any idea?