What must cargo pumps in tank vessels carrying grade D liquid cargo be isolated from sources of vapor ignition by?
Official USCG Answer & Rule Citation
Correct Answer: Option C — gastight bulkheads
Per 46 CFR, spaces containing machinery driven by or for cargo pumps handling Grade D liquids must be separated from sources of vapor ignition by gastight bulkheads to prevent the migration and ignition of flammable hydrocarbon vapors.
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