What critical feature does a high-pressure receiver vessel possess?

A high-pressure receiver vessel is specifically designed to safely contain gases or liquids under high pressure, which makes the presence of relief valves a critical feature. These relief valves are essential for safety because they act as a safety mechanism to prevent overpressure conditions within the vessel. If pressure within the vessel exceeds the designed limits, these valves will open to release excess pressure, thereby preventing potential failures, explosions, or leaks that can have disastrous consequences.

Other features, while they may be relevant in some contexts, do not inherently apply to the function of a high-pressure receiver vessel as directly as the relief valves do. For instance, it is not necessary for such a vessel to be completely empty at all times, as they are designed to contain specific volumes of materials. Maintaining a normal operating level is important for some equipment but does not specifically pertain to high-pressure conditions. Operating under low pressure contradicts the very definition of a high-pressure vessel, which is created to function under high-pressure scenarios. Hence, the critical safety aspect highlighted by the presence of relief valves is paramount for the safe operation of such vessels.