21. Flash evaporators generally use a “once through” system whereby the entire seawater feed is preheated through the stage condensers and seawater feed heater and allowed to flash down through the stages. The distilled water was produced at a pressure lower than the vapor pressure of the entering heated seawater. The resultant brine from the last stage is pumped
overboard. When the sea water was heated up to 85℃ fro normal operation, which following
statement is correct?
(A) The operating pressure inside the flash evaporator is less than atmospheric pressure.
(B) There is no brine produced in the flash evaporator.
(C) The fresh water generated inside this flash evaporator is suitable for direct drink of any crew member.
(D) The seawater is not evaporated in the flash evaporator due to low entry temperature.
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