Regulations require that cargo pump rooms on tank barges (constructed in 1965) carrying grades B or C liquid cargoes have power ventilation systems. In what time period can these systems completely change the air?

Correct Answer: Option B — 3 minutes

Title 46 CFR engineering standards require power ventilation systems in tank barge pump rooms handling volatile Grade B or C cargoes to completely change the compartment air every three minutes, ensuring rapid clearance of flammable vapors.