In a flash evaporator, scale as a result of higher than normal temperatures is most likely to occur in the __________.

Correct Answer: Option D — saltwater feed heater

Scale formation is primarily driven by temperature-dependent solubility of calcium and magnesium salts. The saltwater feed heater experiences the highest temperatures in the system, making it the most susceptible area for rapid scale accumulation. Regular monitoring and chemical treatment are required to maintain heat transfer efficiency in this critical component.