Question 246General Subjects - Assistant Engineer
70% to passWhen the oily-water separator, shown in the illustration, is in operation and processing clear bilge water, what should be the internal water level? Illustration GS-0153
AThe water level in the tank should be slightly above the upper coalescer bed "9".
BThe water level should be located in the lower section of the tank as controlled by flow control valve "14".
CThe water level should be located in the upper section of the tank.
DNo water level is maintained in the tank.
AI Explanation
The correct answer is C) The water level should be located in the upper section of the tank. When the oily-water separator is in operation and processing clear bilge water, the internal water level should be maintained in the upper section of the tank. This allows the water to flow through the coalescer bed (item 9) and the oil/water interface to remain in the upper portion, facilitating the separation of oil from the water. The water level is not controlled by the flow control valve (item 14), which is used to regulate the flow rate, not the water level. There is no need to maintain the water level slightly above the coalescer bed, and the tank should not be operated without any water level.
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