To prevent misting in the steam boiler, the steam drum is equipped with which device?

To prevent misting in the steam boiler, the steam drum is equipped with which device?

• A. Steam Separator
• B. Steam Trap
• C. Demister
• D. Deaerator

Answer: (A)

Misting happens when tiny water droplets are carried with the steam leaving the drum. To prevent this and improve steam quality, the steam drum includes a mist-eliminating device called a demister. A demister provides a large surface area (often a mesh, pad, or similar packing) that encourages droplets to collide, coalesce into larger droplets, and then drain back down into the water rather than being entrained in the steam. This keeps the steam leaving the drum much drier and reduces carryover downstream. A steam trap, in contrast, removes condensate from steam lines, not the droplets still suspended in the steam. A deaerator removes dissolved gases, not moisture, and a steam separator broadly describes separation processes but the unit specifically designed to remove mist within the drum is the demister.

Misting happens when tiny water droplets are carried with the steam leaving the drum. To prevent this and improve steam quality, the steam drum includes a mist-eliminating device called a demister. A demister provides a large surface area (often a mesh, pad, or similar packing) that encourages droplets to collide, coalesce into larger droplets, and then drain back down into the water rather than being entrained in the steam. This keeps the steam leaving the drum much drier and reduces carryover downstream.

A steam trap, in contrast, removes condensate from steam lines, not the droplets still suspended in the steam. A deaerator removes dissolved gases, not moisture, and a steam separator broadly describes separation processes but the unit specifically designed to remove mist within the drum is the demister.