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 open. Valve "D" is closed. What is the operational status of the oily-water separator unit? Illustration GS-0175

Correct Answer: Option C — The oily-water separator is in the bilge water separation processing mode with water discharging overboard with an oil content less than 15 ppm.

With the solenoid closed, the oil content monitor is not diverting flow, and the open check valve in line (E) indicates normal processing. Since the system is discharging overboard, the oil content must be below the 15 ppm limit mandated by MARPOL Annex I for legal discharge of processed bilge water.