🔍 Key Concepts

• Function of a deaerating feed water tank (DC heater) in removing dissolved gases and storing/feedwater for the boiler • How condensate flow, make‑up (distilled) water, and air ejector/loop seal affect water level in the DC heater • Normal water level controls: what causes water to flow into the DC heater vs. be drawn out to the boiler(s)

💭 Think About

• For each choice, ask yourself: does this action add water into the DC heater, remove water from it, or bypass it? Only something that increases net inflow or reduces outflow will cause a high level. • Think through the path: condenser → condensate pumps → DC heater → feed pumps → boilers. Which option would send more water than normal toward the DC heater or reduce the amount being sent onward to the boilers? • Consider how an air ejector loop seal malfunction would change flow paths of condensate/air mixture—would that tend to flood or starve the DC heater?

✅ Before You Answer

• For each option, trace the actual flow path of water: does it pass through the DC heater, go around it, or leave the system to a storage tank? • Check which condition would: (1) increase condensate return to the DC heater, or (2) reduce the boiler’s demand for water from the DC heater, both of which can cause a rising level. • Verify which option involves the condensate/air handling system directly connected to the DC heater, rather than a separate storage or operating level condition.