How is the water level controlled in the surface condenser hot well of a steam turbine?

The operation of the recirculation and overboard valves is the correct method for controlling the water level in the surface condenser hot well of a steam turbine. This system relies on the ability to manage the flow of water based on the levels detected within the hot well. When the water level rises too high, the overboard valve can be opened to discharge excess water, maintaining an optimal operation level. Conversely, when the water level drops too low, the recirculation valve can allow water to flow back into the system, thus ensuring a consistent and adequate water supply for the condenser's operation.

This method is crucial because it provides an automated and responsive approach to managing water levels in response to varying operational conditions, which is vital for maintaining efficiency and preventing any operational disruptions in the steam turbine process. Other methods such as manual observation or using a float switch system may not provide the same level of precise control or responsiveness needed for optimal functioning in dynamic operational environments.