Question 416General Subjects - 1st Asst/Chief
70% to passFor the most efficient centrifuging of residual fuels on motor vessels, the lower the viscosity of the fuel as achieved by preheating, the more efficiently solids and moisture can be removed. For planning purposes, what is the typically the recommended upper limit of preheating for residual fuel oil centrifugation on motor ships?
A85oC
B90oC
C98oC
D112oC
AI Explanation
The correct answer is C) 98°C. The recommended upper limit for preheating residual fuel oil prior to centrifugation on motor ships is typically 98°C. This temperature range helps reduce the fuel viscosity to the optimal level for efficient removal of solids and moisture during the centrifugation process. Preheating the fuel to a lower temperature, such as 85°C (option A), may not reduce the viscosity enough for optimal centrifugation. Conversely, preheating to higher temperatures like 112°C (option D) could potentially damage the fuel or the centrifugation equipment. The other options, 90°C (option B) and 112°C (option D), are not the recommended upper limit for typical motor vessel applications.
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