What is a pressure vessel designed to do?

A pressure vessel is designed to operate at pressures significantly greater than atmospheric pressure, which typically means above 15 psig (pounds per square inch gauge). This definition is important because it highlights the primary purpose of pressure vessels: to safely contain substances under pressure, whether they are gases or liquids, preventing leaks and ensuring stability.

In healthcare settings, for instance, pressure vessels are commonly used to store and manage medical gases that may be used in various treatments. These vessels are built to endure high internal pressures, which is critical to ensure both the safety of the facility and the effectiveness of the gases being stored.

The other options describe scenarios that do not align with the fundamental function of a pressure vessel. Storing gases at ambient pressures doesn’t necessitate a pressure vessel, as typical containers are sufficient for normal atmospheric conditions. Containing corrosive liquids safely refers to a different kind of vessel designed specifically for chemical storage, and venting gases safely to the atmosphere is typically handled by venting systems rather than pressure vessels themselves. Thus, the correct choice encapsulates the essence of what a pressure vessel is fundamentally designed to do.