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單項選擇題

After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.

A.15；inlet value
B.15；inlet and outlet value
C.30；inlet value
D.30；inlet and outlet value

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單項選擇題

Before the oily water separator put into operation, it should be （）

A.filled with bilge water
B.filled with oil
C.filled with clean water
D.be emptied

單項選擇題

The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is （）

A.the sensor of low oil level is fully covered by sludge
B.the coarse strainer before the pump in suction system is clogged
C.the screw pump is worn seriously and volumetric efficiency is decreased
D.bilge suction value is clogged