Large hemispherical heads on both ends of a tank are characteristic of which type of cargo tank truck?

Large hemispherical heads on both ends of a tank are characteristic of high-pressure cargo tank trucks. These trucks are designed to transport materials under high pressure, which necessitates a strong structure to withstand the forces involved. The hemispherical shape helps to distribute stress uniformly along the tank walls, enhancing the structural integrity and safety of the tank when carrying gases or liquids that are pressurized.

Understanding the specific design features of various cargo tank types is crucial in HAZMAT operations. High-pressure carriers are used for substances like propane and ammonia that are stored under high pressure when transported. This design is distinctly different from non-pressure or low-pressure carriers, which have different structural requirements and shapes to accommodate the lower pressures they handle.