Question on "Modeling Spring Can with Friction"

Dear Sirs:

Am currently including the equipment representation of a sulfur converter in the piping system. Generally, expansion bellows are installed on the pipes before the nozzles...

We decided to absorb the movement of the pipes by resting the equipment itself on Spring supports...

According to Caesar Application Guide (Modeling Spring Can With Friction), there should be a weightless rigid element connected (by CNODE) after the spring can (to represent spring can height) if i were to put the friction at the spring's base; and be removed if friction will be placed on trunion or shoe on top of spring can. Application of +Y with friction would be on the CNODE originally meant to represent the spring can height

My question is that, do i still have to apply Translational and Rotational restraint (except Y) on the node connecting the saddle and the spring can?

Thanks

Yes.

Based on application guide example

For situation where the shoe slides on top of bolted spring. Which is correct.

A)

Node 10 hanger Cnode 15
Node 10 X Cnode 15
Node 10 Z Cnode 15

Node 15 +Y Mu 0.3
Node 15 RX
Node 15 RY
Node 15 RZ

OR

B)

Node 10 hanger Cnode 15
Node 10 X Cnode 15
Node 10 Z Cnode 15
Node 10 RX,RY,RZ Cnode 15


Node 15 +Y Mu 0.3
Node 15 RX
Node 15 RY
Node 15 RZ

I would go with "option A", because node 10 can rotate.

Yes node 10 can rotate but that rotation is not independent. It will also have effect on Node 15.