Hye guys
Looking for opinion regarding the relief gas at the heat exchanger.
There is a relief valve to protect the heat exchanger and the governing case is thermal expansion (as mention in the P&ID). Currently the heat exchanger size need to be increased since the service flowrate has been increased. The cold side (shell side) flow rate need to be increased and also the hot side. My question, do we need to re-study the governing case of the relief valve? I think it should be the same (thermal expansion case) since we just increase the size of the heat exchanger. The system remain same. Or is it possible to change from thermal expansion to fire case or something?