Referring to the illustration, note that the solenoid in line "C" is closed. The check valve in line "E" is open. The separator service pump is running. The check valve in line "G" is closed. Valve "B" is closed. Valve "D" is open. What is the operational status of the oily-water separator unit? GS-0175

Correct Answer: Option C — The oily-water separator is in the bilge water separation processing mode with water discharging back to the bilge water holding tank with an oil content greater than 15 ppm.

With the solenoid closed and the discharge directed back to the holding tank, the system is in a recirculating mode. Since the oil content is monitored as greater than 15 ppm, the automatic discharge valve prevents overboard release, forcing the fluid back to the bilge holding tank for reprocessing.