In a tank vessel constructed in 1970, carrying grade A, B, C, or D liquid cargo, what is required to isolate cargo pumps from sources of vapor ignition?

Correct Answer: Option A — gastight bulkheads

Title 46 CFR structural fire protection standards require gastight bulkheads to separate cargo pump rooms from sources of vapor ignition on tank vessels, preventing the migration of flammable hydrocarbon gases into non-hazardous spaces.