What is the operating condition of the feed water pump?

The correct answer emphasizes that the feed water pump supplies feed water above the operating pressure of the boiler. This is crucial because the feed water must be delivered at a pressure higher than that within the boiler to ensure effective circulation and to overcome the pressure gradient created by the steam generation and the operating conditions within the boiler system.

In typical boiler operations, the feed water pump's primary function is to ensure that water enters the boiler under sufficient pressure so that it can be heated efficiently and transformed into steam. If the pressure of the feed water is not adequately maintained above the boiler operating pressure, it could lead to improper water flow, potential boiling within the pump, and ultimately inefficiencies or failures in the steam generation process.

This scenario contrasts with the other options. Supplying feed water at atmospheric pressure would not support the operational needs of the boiler effectively. Similarly, providing water below the operating pressure of the boiler would hinder circulation and possibly result in issues such as backflow. Continuous circulation of feed water refers to the operational process of maintaining water flow but does not specifically address the need for this flow to occur at a pressure greater than that in the boiler. Therefore, understanding the operating condition of the feed water pump is crucial for ensuring the overall efficiency and safety of boiler operations