According to IMC guidelines, what is the minimum tubing size required for a system with a capacity of 65 tons of refrigerant?

To determine the minimum tubing size required for a system with a capacity of 65 tons of refrigerant according to IMC guidelines, it's essential to refer to the recommended practices for refrigerant line sizing.

For refrigerant systems, the line size is critical for ensuring efficient operation and minimizing pressure drop. A system with a capacity of 65 tons typically translates to significant refrigerant flow requirements. The IMC guidelines provide specific recommendations based on the cooling capacity to maintain optimal system performance.

In this case, 1-1/4 inch tubing has been assessed to accommodate the flow rate associated with a 65-ton system effectively. It strikes a balance between minimizing resistance and maintaining proper velocity for refrigerant transport. This size ensures that there is sufficient refrigerant flow while mitigating issues such as flooding and oil return, which can impact system efficiency and longevity.

The other options exceed or do not meet the requirements set by the guidelines. Larger sizes could lead to unnecessary costs and complications, while smaller sizes might restrict flow and lead to inefficiencies or system damage. Therefore, 1-1/4 inch emerges as the optimal choice for this application.