Which statement about cryogenic intermodal tanks is true regarding insulation and pressure?

• A. They are uninsulated
• B. They are lightly insulated and low-pressure
• C. They are heavily insulated and can have high pressure up to 300 psi
• D. They cannot carry liquids

Answer: (C)

Cryogenic intermodal tanks are designed to keep very cold liquidscold, which means insulation is essential. The extreme cold needs a heavy, often vacuum-based insulation system to minimize heat entering the tank. When heat does get in, the liquid boils off into gas, and that gas raises the pressure inside the tank. To handle this safely, the tanks are built to withstand significant internal pressure and have relief systems to vent excess gas, keeping the pressure within safe limits. Because of this, these tanks are heavily insulated and can be designed to tolerate higher pressures—up to about 300 psi. The other statements don’t fit the reality: uninsulated tanks would lose temperature rapidly and boil off continuously; lightly insulated tanks would still generate substantial boil-off and pressure; and a cryogenic intermodal tank is specifically meant to carry liquids, not be incapable of doing so.