Motor Plants & Auxiliary Boilers USCG Question #1415 (Set 28)

From the graph shown in the illustration, if the separating temperature required is to be 167°F, and the specific gravity of the oil is 0.98 kg/dm3 at 59°F, what size regulating ring is required? Illustration MO-0113

USCG Exam Illustration MO-0113
USCG Examination Diagram: Illustration MO-0113
Official USCG Answer & Rule Citation

Correct Answer: Option C — 92 mm

Gravity disc sizing graphs correlate operating temperature, oil specific gravity, and feed rate to determine the correct separating interface ring diameter, ensuring the water seal is maintained properly for a 92 mm ring under these specific parameters.

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