Do vacuum devices belong to pressure vessels?
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As the title suggests, vacuum equipment is under external pressure, but the pressure in a true vacuum is only 0.1 Mpa. Is vacuum equipment considered a pressure vessel?
Working pressure greater than 0.1 MPaG
It falls outside the scope of pressure vessel management as defined by relevant regulations.
Vacuum equipment does not belong to pressure vessels. According to the definition in the \"Safety Technical Inspection Regulations for Fixed Pressure Vessels,\" the internal pressure must be greater than or equal to 0.1 MPa.
Pressure vessels require an internal operating pressure of more than 0.1 MPa gauge pressure; vacuum vessels do not meet this requirement.
Those not subject to regulatory controls are not exactly the same as pressure vessels; although they are not regulated, they are governed by GB150, which indicates that they are still considered pressure vessels, as the name of GB150 is indeed \"Pressure Vessels\"
Pressure vessels can be divided into internal pressure vessels and external pressure vessels. Internal pressure vessels can be divided into four pressure classes according to their design pressure. In external-pressure vessels, when the pressure inside the vessel is less than one absolute atmosphere (about 0.1 MP), they are also referred to as vacuum vessels.
Pressure vessels can be divided into internal pressure vessels and external pressure vessels. Internal pressure vessels can be divided into four pressure classes according to their design pressure. In external-pressure vessels, when the pressure inside the vessel is less than one absolute atmosphere (about 0.1 MP), they are also referred to as vacuum vessels. One category consists of those in which the pressure acting on the outer surface of the shell is higher than atmospheric pressure and also greater than the pressure on the inner surface, such as deep-sea operation equipment and the heat exchange tubes in shell-and-tube heat exchangers ； Another type has its outer surface exposed to atmospheric pressure while the interior operates under vacuum, such as the shell of a vacuum distillation tower. -----