Which of the following is NOT an example of a pressure facility tank?

• A. High-pressure horizontal tank
• B. Low-pressure vertical tank
• C. Cryogenic liquid tank
• D. High-pressure spherical tank

Answer: (B)

Understanding what makes a tank a pressure facility tank: these vessels are built to contain materials at significant internal pressures, so their walls are thick, fittings are reinforced, and they include pressure-relief devices. High‑pressure horizontal tanks and high‑pressure spherical tanks are classic examples designed specifically to withstand and manage those pressures. Cryogenic liquid tanks are designed to keep extremely cold contents and handle boil-off pressures, so they are also treated as pressure-containing equipment in hazmat contexts. A vertical tank that operates at low pressure or at atmospheric conditions isn’t built to withstand internal pressure and typically serves as a non‑pressure storage vessel, which is why it isn’t considered a pressure facility tank.