Which device uses stripping steam to remove and dissolve oxygen from boiler feed water before it enters the boiler?

• A. Deaerator
• B. Attemperator
• C. Steam Trap
• D. Burner Valve

Answer: (A)

The device that uses stripping steam to remove dissolved oxygen from boiler feed water before it enters the boiler is the deaerator. It heats the feedwater and brings in stripping steam, which contacts the water and liberates dissolved gases like oxygen and carbon dioxide. Those gases are vented away, leaving deaerated water that reduces corrosion inside the boiler tubes and piping. This function is what makes a deaerator essential for protecting the boiler system.

Attemperators regulate feedwater temperature to control steam temperature and prevent thermal damage, not gas removal. Steam traps simply remove condensate from steam lines, and burner valves control fuel flow to the burner.