HAZMAT Ops Practice Test

A pressure tank is specifically designed to operate at pressures exceeding 15 psi. This type of tank maintains its contents in a pressurized state, allowing for the safe storage and transport of hazardous materials that may require such conditions to remain stable or effective. The walls of a pressure tank are built to withstand high pressure, which differentiates it from tanks designed for atmospheric or vacuum conditions.

In contrast, vacuum tanks are built to operate below atmospheric pressure, while atmospheric tanks operate at ambient pressures, meaning they maintain pressure close to that of the surrounding environment. Mobile tanks are versatile storage units that may or may not be under pressure, depending on their design and the specific substances they carry. Hence, a pressure tank is the only option explicitly intended for operations at high pressure, making it the correct choice in this context.