For pipes that cross from one platform to other through bridges, bridge displacement in the most critical cominations will be considered in the calculation.

Analysis shall be carried out considering one end of the bridge piping as fixed and imposing the relative displacements of the platforms along the axial direction at the other end of the piping, acting towards the fixed end.

The worst case shall be when both the platforms move towards each other.

The bridge displacement values shall be taken from the structural design basis or calculation reports.
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Rathish.G
Stress Engineer