What is the primary function of a feedwater tank vent?

The primary function of a feedwater tank vent is to release air or steam to maintain proper pressure. In a feedwater system, as water is heated and converted to steam, it can create pressure buildup within the tank. The vent serves to allow this excess air or steam to escape, which helps to prevent pressure from rising to unsafe levels. By maintaining the correct pressure, the vent ensures the safe and efficient operation of the system. It also aids in avoiding potential damage to the tank and connected components, contributing to the overall reliability of the feedwater system.

The other options, although relevant to boiler operation, do not represent the core purpose of the vent. For instance, while maintaining proper water levels is crucial, this is typically managed through level control mechanisms and not directly related to the vent's primary function. Likewise, monitoring temperature is also essential for operational efficiency but is managed through separate temperature sensors rather than through the vent. Lastly, controlling the flow of condensate is part of system management, but it does not pertain directly to the venting function, which focuses specifically on pressure equilibrium.