Which type of cargo tank carries liquids at lower pressures?

• A. MC-331 cargo tank
• B. MC-306/DOT-406 cargo tank
• C. Intermodal tank
• D. Pressure tank car

Answer: (B)

The MC-306/DOT-406 cargo tank is specifically designed to carry liquids at lower pressures. This type of tank is typically used for transporting non-pressurized hazardous materials like gasoline, other flammable liquids, and various chemicals. The design of the MC-306/DOT-406 includes a configuration that can safely handle the types of liquids it transports without the need for maintaining high-pressure levels.

In contrast, the other options are not focused on lower pressure operations. The MC-331 cargo tank is built to transport liquefied gases under pressure, including propane and ammonia. Intermodal tanks can carry a variety of liquids but can operate at different pressures depending on their design and purpose. The pressure tank car is specifically designed for transporting gases and liquids at higher pressures, clearly differing from the function of the MC-306/DOT-406. Hence, the unique characteristics of the MC-306/DOT-406 make it suitable for lower pressure liquid transportation.