How should horizontal refrigeration piping lines be sloped in the direction of refrigerant flow?

The correct slope for horizontal refrigeration piping lines is essential for proper refrigerant flow and to prevent liquid refrigerant from gathering in the lines, which can cause compressor damage or inefficiency. A slope of 4.2 mm per metre (½ inch per 10 feet) ensures that the refrigerant can drain back to the compressor or other appropriate component without issues, helping maintain the system’s efficiency and reliability.

Implementing this slope reduces the risk of refrigerant pooling in the piping, which can lead to operational problems such as slugging in the compressor, decreased heat absorption, or increased energy consumption. This slope standard helps create a self-draining effect that is critical for the effective functioning of a refrigeration system.

Other options provide slopes that are either too shallow or too steep, which can compromise the performance and reliability of the refrigeration system. Thus, the chosen slope of 4.2 mm per metre (½ inch per 10 feet) is optimal for ensuring that the refrigerant flows correctly within the piping system.