Question 254General Subjects - 1st Asst/Chief

The correct answer is D) Density. The density of the fuel oil is the key data needed to select the correct purifier gravity disk for fuel oil centrifugal purifiers. The purifier gravity disk needs to be matched to the specific gravity of the fuel oil in order to effectively separate the oil from water and other contaminants during the centrifugation process. Knowing the density allows the operator to choose the appropriate disk that will optimize the purification of the fuel oil. The other answer choices, such as calorific heat content, ignition quality, and water content, are not directly used to select the purifier gravity disk. These other fuel properties may be important for other aspects of fuel oil analysis and handling, but the density is the critical parameter for choosing the correct purifier disk.