Hello Forum, I'm looking to install a new chemical storage tank at my site. The tank itself is not rated for vacuum. We will have proper ventilation and nitrogen pumping into the tank to compensate when we are pumping out of the bottom. However, I do want to include a pressure transmitter on the tank that will turn off the outlet pump in case pressure in the tank continues to drop to a dangerous level that may implode the tank. My question is should I be more concerned about the pressure of the liquid in the tank or the pressure of the gas (in this case nitrogen) of the tank?