Damanpreet,

You are dealing with High temperature Turbine piping and routing should be such that you will have a point in the piping system, where the thermal displacements will be close to zero. Add a guide or axial stop based on this and this will take care of your wind problem. Dont use special supports like snubbers as they require maintenance and snubbers are additional cost to the client. In this way, you can increase ur piping stiffness without affecting your Nozzle. Check NEMA SM23 for the allowable loads for 400 NB pipe in operating condition.

Regards