What potential issue could arise from having a cooling leg upstream of a thermostatic bellows trap?

The correct answer highlights a significant problem related to steam and condensate management in a steam system. When a cooling leg is installed upstream of a thermostatic bellows trap, it can lead to excess condensate accumulation, which may cause water logging. This occurs because the cooling leg effectively allows condensate to accumulate due to a temperature drop, leading to a situation where water can build up in the system instead of being efficiently drained away.

Water logging can hamper the performance of the steam system, as it can limit the flow of steam and create inefficiencies in heat transfer. The presence of condensate in areas where steam is expected can lead to pressure loss, potential operational hazards, and increased wear and tear on equipment.

The implications of water logging extend to reduced system efficiency that can also result in safety concerns, including the risk of water hammer or equipment failure. Therefore, maintaining proper drainage and preventing excess condensate buildup is critical for the reliable operation of steam systems.