Why would a HVAC tech put a refrigerant tank in a bucket of ice?

An HVAC technician might place a refrigerant tank in a bucket of ice to help lower the pressure inside the tank during charging or recovery processes. Cooling the tank reduces the temperature of the refrigerant, which decreases its pressure and allows for safer and more efficient handling. This practice helps prevent over-pressurization and ensures that the refrigerant is transferred smoothly and effectively. Additionally, maintaining proper temperatures can help avoid potential hazards associated with high-pressure refrigerants.