Which component is particularly susceptible to leaks in low pressure refrigeration systems with open drive compressors?

In low pressure refrigeration systems with open drive compressors, the shaft seal is particularly susceptible to leaks. This is due to its function as a barrier that prevents refrigerant and oil from escaping the compressor during operation. The shaft seal is located where the rotating shaft exits the compressor housing, making it critical for maintaining system integrity.

Over time, factors such as wear, temperature fluctuations, and exposure to refrigerants can degrade the seal, leading to potential leaks. Since open drive compressors typically operate in environments that can be demanding, the risk of failure at the shaft seal increases, resulting in leaks that can adversely affect system performance and efficiency.

Other components, while important, do not present the same level of vulnerability as the shaft seal. For example, the compressor housing is more robust and designed to withstand the internal pressure, making it less likely to develop leaks simply due to its structural integrity. The expansion valve may experience issues related to freezing or blockages but is not specifically prone to leaks, and the return line, while it can develop leaks due to wear or corrosion, is generally not as critical as the shaft seal in terms of maintaining system pressure and refrigerant containment.