Question 167Safety & Environmental - QMED

70% to pass

Following a grounding, what would happen to the level of a slack double bottom tank if the tank was holed?

AAfter repeated soundings, the indicated tank level would gradually drop.
BAfter repeated soundings, the indicated tank level would gradually rise.
CAfter repeated soundings, the indicated level would remain essentially constant.
DThe change of level in the slack tank cannot be predicted.
AI Explanation

The correct answer is B) After repeated soundings, the indicated tank level would gradually rise. This is because if a slack double bottom tank is holed following a grounding, water will gradually enter the tank, causing the indicated level to rise. As water enters the tank, it will displace the air in the tank, causing the level to increase on the sounding tube or gauge. The other options are incorrect: A) The level would not gradually drop, as water would be entering the tank, not draining out. C) The level would not remain constant, as the influx of water would cause the level to rise. D) The change in level can be predicted - it would rise as water enters the tank.

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Official Resources
46 CFR Safety Equipment USCG Environmental Standards USCG National Maritime Center
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