Cryogenic intermodal containers are best described as which of the following?

• A. Atmospheric Pressure and Poorly Insulated
• B. Non-Insulated
• C. Pressurized and Insulated
• D. Non-Pressurized, Highly Insulated

Answer: (D)

Cryogenic intermodal containers are built to keep very cold liquids from warming up. The key feature is extreme insulation—typically a double wall with vacuum or highly effective insulating materials—to minimize heat entering the container. Because the design relies on maintaining the liquid at a cryogenic temperature rather than building up high pressure, these vessels are not kept pressurized; any boil-off gas is vented to the atmosphere to prevent pressure buildup. So the best description is non-pressurized and highly insulated. The other options misstate either the level of insulation or the pressure inside the container.