Repeated priming in a steam boiler can cause damage to the ______.

• A. Boiler Drum
• B. Economizer
• C. Superheater
• D. Feedwater Pump

Answer: (C)

When priming occurs, boiler water is carried into the steam path as droplets. The superheater sits in the hot steam line and is designed for dry, high-temperature steam. When liquid droplets reach these hot tubes, they impact the surfaces with energy, causing erosion and pitting of the metal. The moisture also brings dissolved impurities that can deposit on the tube surfaces, creating hot spots and accelerating corrosion. Over time, repeated exposure weakens the superheater tubes and can lead to leaks or failure. The drum and economizer can experience issues from carryover as well, but the superheater is the most vulnerable because it handles very hot, moist steam and is directly in the path of the entrained liquid.