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Flash steam is produced when condensate at boiler pressure is

  • A.returned to the feed tank at the same pressure
  • B.passed through a strainer at constant pressure
  • C.released to a lower pressure
  • D.cooled below its saturation temperature

Answer: C

The water is above the saturation temperature of the lower pressure, so part of it boils immediately and the rest cools to the new saturation temperature. Capturing that steam in a flash vessel and using it at the lower pressure recovers heat that would otherwise be vented.

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