DOT 111 is a _____________ Tank.

DOT 111 is a _____________ Tank.

• A. Low Pressure Tank
• B. High Pressure Tank
• C. Cryogenic Tank
• D. Vacuum Tank

Answer: (D)

The main idea this question tests is how cargo tanks are categorized by the pressure they are designed to hold. Tanks are built for different internal pressures, and the designation helps you recognize their typical use and construction. A vacuum tank is designed to operate with near-zero or negative internal pressure relative to the outside, and it often uses a vacuum-insulated shell to minimize heat transfer and control vapor generation. That insulation and pressure profile distinguish it from low-pressure, high-pressure, or cryogenic designs. In this context, the DOT 111 designation corresponds to a vacuum-type tank, which is why the correct fill-in is a Vacuum Tank.

The main idea this question tests is how cargo tanks are categorized by the pressure they are designed to hold. Tanks are built for different internal pressures, and the designation helps you recognize their typical use and construction. A vacuum tank is designed to operate with near-zero or negative internal pressure relative to the outside, and it often uses a vacuum-insulated shell to minimize heat transfer and control vapor generation. That insulation and pressure profile distinguish it from low-pressure, high-pressure, or cryogenic designs. In this context, the DOT 111 designation corresponds to a vacuum-type tank, which is why the correct fill-in is a Vacuum Tank.