General Subjects (Auxiliaries & Systems) USCG Question #552 (Set 10)

Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator are removed by the __________.

Official USCG Answer & Rule Citation

Correct Answer: Option B — demisters

Demisters, typically constructed of knitted wire mesh, are installed in the vapor path of flash evaporators. They force the vapor to change direction, causing entrained brine droplets to impinge on the mesh and coalesce. This process ensures the produced distillate meets purity standards by preventing carryover of salt-laden water.

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