While operating the fuel oil centrifuge shown in the illustration, the fuel oil is being continuously ejected with the sludge and the seal water. The probable cause is the __________. Illustration MO-0012

Correct Answer: Option B — gravity disk inside diameter is too large

The gravity disk establishes the position of the oil/water interface within the bowl. If the internal diameter is too large, the interface moves too far outward, causing the seal water to break and leading to clean oil discharging continuously out of the sludge and water ports.