What is the allowable size range for unprotected, soft, annealed copper tubing used in a refrigerant plant?

The allowable size range for unprotected, soft, annealed copper tubing used in a refrigerant plant is 6mm to 35mm. This range is specified to ensure that the tubing can handle the pressures and temperatures associated with refrigeration systems while maintaining sufficient mechanical properties.

Using tubing that falls within this size range provides optimal flow characteristics for refrigerants, which is critical for system efficiency. Tubing that is too small may restrict flow and lead to inefficiencies or pressure drops, while tubing that exceeds the maximum size may not fit standard fittings or may be unnecessarily heavy, complicating installation and maintenance.

This size range is in line with industry standards and safety regulations, ensuring that equipment operates reliably and safely in a refrigerant plant setting.