Which statement about high-pressure CO2 systems is true?

Which statement about high-pressure CO2 systems is true?

• A. They use standard components with no special ratings.
• B. They rely on mineral oil for lubrication exclusively.
• C. They require pressure-rated and robust components to handle high system pressures.
• D. They operate at low temperatures only and require no safety considerations.

Answer: (C)

High-pressure CO2 systems operate at pressures much higher than typical refrigerant systems, so every component that contains CO2 must be designed and rated for those pressures. This ensures valves, hoses, fittings, vessels, and the compressor can withstand normal operation and pressure surges without leaks or failure. Using non-rated, standard components risks catastrophic rupture or leaks when under high pressure. Lubrication in CO2 systems isn’t simply mineral oil; many CO2 systems require lubricants that are specifically compatible with CO2, so relying on mineral oil alone isn’t appropriate. Safety matters too—CO2 can displace oxygen, and high-pressure releases require proper relief devices and ventilation. So the statement that best fits is that these systems require pressure-rated and robust components to handle high system pressures.

High-pressure CO2 systems operate at pressures much higher than typical refrigerant systems, so every component that contains CO2 must be designed and rated for those pressures. This ensures valves, hoses, fittings, vessels, and the compressor can withstand normal operation and pressure surges without leaks or failure. Using non-rated, standard components risks catastrophic rupture or leaks when under high pressure. Lubrication in CO2 systems isn’t simply mineral oil; many CO2 systems require lubricants that are specifically compatible with CO2, so relying on mineral oil alone isn’t appropriate. Safety matters too—CO2 can displace oxygen, and high-pressure releases require proper relief devices and ventilation. So the statement that best fits is that these systems require pressure-rated and robust components to handle high system pressures.