While operating the fuel oil centrifuge shown in the illustration, the bowl fails to open for sludge ejection. The probable cause is that __________. Illustration MO-0012

Correct Answer: Option D — the seal ring on the operating slide is defective

A defective seal ring on the operating slide of a self-cleaning centrifuge prevents the necessary hydraulic pressure drop across the sliding bowl, causing bowl opening failure during sludge ejection.