What is the storage pressure of a high‑pressure CO2 system at 70°F?

What is the storage pressure of a high‑pressure CO2 system at 70°F?

• A. 800 psi at 70°F
• B. 850 psi at 70°F
• C. 900 psi at 60°F
• D. 1000 psi at 75°F

Answer: (B)

The pressure in a high‑pressure CO2 storage system is determined by CO2’s saturated vapor pressure at the storage temperature. At 70°F, the saturated vapor pressure of CO2 is about 850 psi, so the storage system is designed to hold around 850 psi. This value comes from CO2 vapor pressure data and reflects the fact that CO2 is stored as liquid in equilibrium with its gas; the pressure is set by the temperature, not by a fixed “gas” pressure at room conditions. The other options don’t match CO2’s vapor pressure at 70°F, which is why 850 psi at 70°F is the correct storage pressure.

The pressure in a high‑pressure CO2 storage system is determined by CO2’s saturated vapor pressure at the storage temperature. At 70°F, the saturated vapor pressure of CO2 is about 850 psi, so the storage system is designed to hold around 850 psi. This value comes from CO2 vapor pressure data and reflects the fact that CO2 is stored as liquid in equilibrium with its gas; the pressure is set by the temperature, not by a fixed “gas” pressure at room conditions. The other options don’t match CO2’s vapor pressure at 70°F, which is why 850 psi at 70°F is the correct storage pressure.