Hi kavin

Calculate linear thermal expansion based on operating & design temperature corresponding to line operating & design temperature from anchor to nozzle point.

Mind that shell & tube type heat exchanger have different temperature for tube & shell.

Instead of calculating displacement manually you can model tank/exchanger/column as pipe piece with proper diameter & thickness caesar will take care of nozzle displacement.
For pump model rigid body of from pump cassine bottom to pump nozzle.

structural deflection normally not required.
You may go for composite analysis available in caesar to analyse piping with attached structural member.

Regards

Habib