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 __________. MO-0012

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

Continuous loss of fuel oil through sludge and water discharge ports indicates the oil/water interface is located too far outward. This is caused by using a gravity disk with an inside diameter that is too large, creating insufficient counter-pressure.