The final heating of the feed water in a flash type distilling plant is carried out by __________.
Official USCG Answer & Rule Citation
Correct Answer: Option A — low pressure steam admitted to the feed water heater
In flash evaporators, the saltwater feed is preheated before entering the flash chamber. Final heating is achieved by passing the feed through a heat exchanger supplied with low-pressure steam. This ensures the feed reaches the required temperature to flash into vapor upon entering the reduced-pressure environment of the flash chamber.
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