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The design pressure is 0.8 MPa, the operating pressure is -0.1 MPa, the design temperature is 100°C, and the operating temperature is 80°C. The medium is non-condensable gas; can it be classified as a pressure vessel of a higher category?
It shouldn’t be classified as a pressure vessel. The definition of a pressure vessel is: it refers to fixed or mobile containers in which the maximum operating pressure is greater than or equal to 0.1 MPa (gauge pressure) for gases and liquefied gases, and for liquids whose maximum operating temperature is greater than or equal to their standard boiling point; such containers also have a volume of 30 L or more, with an inner diameter (for non-circular cross-sections, this refers to the largest geometric dimension of the cross-section) of 150 mm or more； Cylinders for gases, liquefied gases, and liquids with a standard boiling point of 60°C or lower, whose nominal working pressure at full charge is greater than or equal to 0.2 MPa (gauge pressure), and whose product of pressure and volume is greater than or equal to 1.0 MPa·L ； Oxygen chamber.
The design pressure is 0.8 Mpa, which should fall within the category of pressure vessels