If the 'tank' is more are pressure vessel with formed heads it is possible to use the PD5500 spherical shell option to compute a rough estimate of the flexibility by using the appropriate radius and wall thickness and if you are dealing with a center nozzle.
If the geometry is outside the scope of PD5500 the flexibility should be calculated using FE analysis.
Furthermore, FEA is the only way to deal with geometry of a storage tank roof, taken into account rafter spacing, eccentric nozzle position etc.
Good Luck,
Veit Bockemühl
www.esn-gmbh.com www.pipestressanalysis.com
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