You are towing a 1000 gross ton gasoline tank barge. Regulations say that cargo tank hatches, ullage holes, and Butterworth plates may remain open without flame screens ONLY __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — when the open tanks are gas free
Title 46 CFR strictly prohibits opening cargo tank hatches, ullage plugs, or Butterworth plates on vessels carrying flammable liquids unless the tanks have been certified gas free, eliminating the risk of spark generation and vapor ignition.
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