1. On an existing mud reciprocating pump piping, the current stress analysis shows the block type Tico pads (at all supports/restraints) have NOT been modeled and the calculated natural frequencies and stresses reflect that.

The system is now undergoing an upgrade due to a higher pressure requirement, thus pipe wall thickness, valve weights, pump operating cycles, pulsating pressure, pulsating forces, etc. are all changed.
2. To account for a more realistic stress model, a decision was made to include the Tico pads in the new stress analysis work, so that their stiffness (radial & axial) could be accounted for in the line 'behavior'.
To comply with B31.3 stress requirements, some restraints had to be be released. This, together with the heavier piping, resulted in pipe natural frequencies being as or too near the combined pumps operating cycles, hence unacceptable.

Could anyone with an adequate experience in such installation kindly advise which of the above approaches is in principle the one to follow when performing the stress analysis and why:
1 - Tico properties ignored, Fn's derived, and Tico separately selected to suit the loads or,
2 - Tico properties included?
Many thanks in advance.