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? Illustration GS-0175
• Flow path of clean water from separator outlet through lines G, B, D, and E • Role of the oil content monitor (OCM/OCD) in controlling the solenoid valve in line C and the discharge direction • Difference between discharge overboard versus return to bilge/holding tank when oil content is greater than or less than 15 ppm
• Trace the piping from the separator service pump discharge and decide where the water can actually go with B closed, D open, G closed, and the check valve in line E open. • Consider what it means for the solenoid in line C to be closed: is the OCM allowing or stopping flow to the overboard line, and under what oil concentration condition would it do that? • Ask yourself: with the given valve positions, is the unit stopped, recirculating, or actively processing bilge water—and, if it is processing, where must the effluent be discharged?
• Verify which line leads overboard and which returns to the bilge/holding tank by following the arrows in the illustration. • Confirm what condition (oil content > 15 ppm or < 15 ppm) causes the OCM/solenoid valve in line C to close in a typical oily-water separator system. • Double-check whether any path exists from the separator outlet to the sea with valves B and G closed, and how that affects the correct choice.
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