Dear Mohammad,
I believe that the best is to ask the person that perform the stress analysis. Nevertheless this type of supporting is quite "uncertain". The expansion from Caesar and the expansion during operation some times may differ. Client not always operating their plants at the design conditions; some times the are running over the design conditions. So, the designer need to be very careful when such gaps from calculations are translated to piping support details. For instance when the piping is moving vertically and guide support is required by the stress analysis, then a rigid strut is quite safe device for this type application.
In any case I suggest again, that stress analyst shall be contacted prior to any action on a piping system that is in erection/operation.
Best Regards
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