Pressure requirements for liquid CO2 tanks
At room temperature (20°C or 68°F), the saturated vapor pressure of liquid CO2 is about 57.8 atmospheres (5.8 MPa). To keep CO2 in a liquid state, the tank must be able to withstand at least this pressure.
At room temperature (20°C or 68°F), the saturated vapor pressure of liquid CO2 is about 57.8 atmospheres (5.8 MPa). To keep CO2 in a liquid state, the tank must be able to withstand at least this pressure.
In low temperature environments, the pressure of liquid CO2 decreases. For example, at -20°C (-4°F), the pressure of liquid CO2 may be around 30 atmospheres (3 MPa), but the specific value will vary depending on the temperature change. The tank design needs to be able to accommodate this pressure change.
The critical pressure of CO2 is 73.8 atmospheres (7.38 MPa). At this pressure, the liquid and gaseous states of CO2 cannot be separated and must be stored below the critical point to remain in liquid form.
