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

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

Self-cleaning centrifuge bowls rely on operating water pressure acting on the sliding piston. A defective seal ring on the operating slide causes pressure loss, preventing the piston from dropping and failing to open the bowl for scheduled sludge ejections.