What happens to the feedwater pump if it becomes steam bound?

When a feedwater pump becomes steam bound, it means that steam is entrained in the pump, preventing it from effectively moving water. In such a condition, the presence of steam can create a blockage, reducing or completely stopping the flow of water. This situation arises because the pump is designed to handle liquid, and the entrained steam disrupts the pumping process. Consequently, this can lead to the pump failing to deliver the required quantity of feedwater, which is crucial for maintaining the boiler's operation.

The other potential outcomes identified do not accurately reflect the implications of a steam-bound feedwater pump. For example, operating more efficiently would imply increased performance and effectiveness, which is not the case when steam interferes with the pump's operation. Similarly, overheating typically relates to excessive temperature due to lack of coolant, while increased steam production inaccurately suggests that the pump's malfunction would somehow enhance steam output. Thus, the key concern regarding a steam-bound feedwater pump is its inability to perform its primary function of pumping water effectively.