In the specifications or standards for various pressure vessels, terms such as working pressure, maximum pressure, and design pressure are frequently encountered. Here are their definitions:
(1) Operating Pressure: Operating pressure, also known as working pressure, denotes the pressure at the top of the container during regular process operations, excluding hydrostatic pressure.
(2) Maximum Working Pressure: This refers to the highest pressure that the top of the vessel may experience during process operations, excluding hydrostatic pressure. When the pressure surpasses this limit, the safety device on the container is activated. The maximum working pressure should not exceed the design pressure, and a safety relief device is typically installed on the container.
(3) Design Pressure: Design pressure is the pressure utilized to determine the calculated wall thickness of the vessel and its component dimensions at the corresponding design temperature. The design pressure is determined by the pressure vessel's design unit based on design conditions and relevant specifications.
