Which component takes suction from the Deaerating Feed Tank (DFT) and discharges to a common supply line?

• A. Main feed booster pump.
• B. Desuperheater.
• C. Circulating pump.
• D. Boiler feedwater pump.

Answer: (A)

The capacity to push deaerated water from the Deaerating Feed Tank into the plant’s main feed line is provided by the booster pump. It draws water directly from the DFT and delivers it into the common feedwater supply line that serves the boiler feedwater system. This initial pressure boost is needed so the boiler feedwater pumps can operate effectively and supply water to the boilers. The other devices don’t pull directly from the DFT into the common line: the desuperheater functions downstream to cool fluid, the circulating pump moves water within the boiler loop, and the boiler feedwater pump typically pulls from the booster discharge rather than directly from the DFT.