Hi Vick,

I would approach this first without considering bellow. Check the code stress, pump nozzle loads, heat exchanger nozzle loads, crystallizer nozzle loads, flange evaluation check, local stress on support check (if applicable).

From there, you can decide if there is really a need to put bellows and where to put it if space or hydraulic is a really constraint to re-route the line. You can take advantage of using advanced tools such as FEA Tools for the flexibility & K factors (say, for tees, elbows, exchanger/nozzle junction), as sometimes it might help (especially for high D/t ratios).

I would also take a closer look on the thermal profile of both the line & equipment (as thermal gradient may come into play) by communicating it to process engineer.

Any other opinion is highly appreciated. Just correct if any wrong statement I've made.

Cheers!!!