Before moving a cargo tank, what must be done to its manholes and valves?

• A. Close all manholes and valves and ensure there are no leaks
• B. Open all manholes to vent
• C. Remove all valves
• D. Paint the manholes

Answer: (A)

The key safety step is to seal the tank. Before moving a cargo tank, all manholes and valves must be closed and secured so the tank is leak-tight. This prevents hazardous vapors from escaping, reduces the risk of spills or ignition, and keeps the product intact during transport. Opening openings while the vehicle is moving would release vapors and create a dangerous situation, and removing valves or painting don’t address transport safety. After closing, verify there are no leaks around the closures before proceeding.