Question 76Steam Plants - 1st Asst/Chief

The correct answer is D) flow rate of fuel oil through the heater. The rate of fouling on the oil side of a fuel oil heater is inversely related to the flow rate of fuel oil through the heater. This means that as the flow rate of fuel oil increases, the rate of fouling on the oil side of the heater decreases. This is because a higher flow rate reduces the residence time of the fuel oil in the heater, which in turn reduces the amount of time for fouling to occur. The other answer choices are incorrect because they do not directly relate to the rate of fouling on the oil side of the fuel oil heater. The shape of the heating coils, the quality of steam, and the pressure on the oil are not the primary factors that determine the rate of fouling in this scenario.