Question 102General Subjects - Assistant Engineer

The correct answer is D) The jacket water inlet temperature to the submerged tube bundle. The primary factor that determines the rate of scale build-up on the submerged tube bundle of a jacket water heated submerged tube evaporator is the jacket water inlet temperature. Higher jacket water temperatures lead to increased mineral precipitation and scale formation on the submerged tubes, as the higher temperatures accelerate the rate of scale deposition. The other answer choices are incorrect because the chemical composition of the jacket water coolant additive package, the sea water inlet temperature, and the salt content of the sea water inlet do not directly determine the scale build-up rate on the submerged tube bundle. The jacket water inlet temperature is the key factor that influences the scale formation in this type of evaporator system.