What may happen if a DOT container is overfilled?

When a DOT container is overfilled, it can lead to a situation where the pressure relief valve is activated. DOT containers, which are designed for the storage and transport of liquefied gases, have specific fill levels to maintain safe operational conditions. If the container is overfilled, the liquid gas has no room to expand when temperatures rise, which can lead to an increase in pressure inside the container.

To prevent potential hazards, such as a rupture or explosion, the pressure relief valve is designed to release excess pressure. This operation of the valve is a safety mechanism to ensure that the container does not exceed its maximum allowable pressure. By allowing vapor to escape, it helps prevent dangerous situations that could arise from excessive pressure buildup due to overfilling.

Ensuring proper filling levels is critical in maintaining safety and preventing equipment failure, as all other choices suggest scenarios that could be misleading or unsafe in the context of an overfilled DOT container.