What is NOT required of the cargo tank venting on a tank barge carrying grade A liquids?
Official USCG Answer & Rule Citation
Correct Answer: Option C — The diameter of the vent must be greater than 4 inches in diameter.
USCG regulations for tank barge Grade A venting require individual tank vents, appropriate height above deck, and P/V valves or flame screens, but do not mandate a minimum vent diameter exceeding 4 inches universally across all barge configurations.
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