Where does water flow from an open deaerating feedwater heater?

In an open deaerating feedwater heater, the primary function is to remove dissolved gases—particularly oxygen and carbon dioxide—from the feedwater before it enters the boiler system. The design of an open deaerating feedwater heater allows steam to come into contact with the water, promoting the removal of these gases through a combination of heat transfer and the exchange of gases.

After the water is treated and deaerated within the heater, it flows to the feedwater pump. This pump is responsible for moving the treated water under pressure into the boiler. By directing the flow to the feedwater pump, the system ensures that the water is adequately prepared and at the correct pressure for efficient operation in the boiler.

Thus, recognizing the role of the feedwater pump in the overall system is crucial, as it facilitates the safe and effective use of the treated water in generating steam, which is essential in high-pressure boiler operations. The other options primarily describe components and pathways that do not align with the direct flow of water from an open deaerating feedwater heater.