Are flush bushings allowed in low pressure CO2 systems?

Flush bushings are prohibited in low pressure CO2 systems due to the unique properties and characteristics of carbon dioxide as a refrigerant, particularly under low pressure conditions. The concern with flush bushings is primarily related to the potential for leaks and compatibility with the CO2 itself.

In low pressure systems, the risk of refrigerant leakage is a significant issue; any weak points in the system can lead to inefficiency and safety hazards. Additionally, the materials commonly used for flush bushings may not be compatible with CO2 at low pressures, which can lead to system failure or other operational challenges.

For these reasons, regulations and industry best practices prohibit the use of flush bushings in low pressure CO2 systems to ensure safety, efficiency, and reliability in the operation of these refrigeration systems.