For the maximum working pressure 0.8 MPa, a fixed type of air storage tank with a capacity of 600L.
0.8 * 600 = 480MPaL > 15MPaL, you don't have to think about the medium, it's definitely a pressure vessel.
Check out: TSG R0004-2009, "the fixed pressure container safety technology monitor," which belongs to the special equipment he manages. For the maximum working pressure 0.8 MPa, a fixed type of air storage tank with a capacity of 600L. -- the special equipment requires the qualified unit design, manufacture, installation and commissioning, the use unit needs to be used. Also look at the device name plate, if there are "simple" words on the nameplate. You don't need to use a licence because he's made in a simple pressure vessel.
"TSG R0004-2009" fixed pressure vessel safety technology monitoring procedure. Apply to pressure vessels with the following conditions at the same time. 1 job pressure is greater than or equal to 0.1 MPa The product of work pressure and volume is greater than or equal to 2.5 MPa * L A liquid that is above or equal to its standard boiling point for gas, liquefied gases, and medium maximum working temperature. Note 1-4 containers within the medium as the highest working temperature is lower than the standard boiling point of liquid, if the volume of the gas phase space and the product of the working pressure is greater than or equal to 2.5 MPa * L, also belong to the scope of this standard. So you're talking about the top job pressure of 0.8 MPa, the 600L fixed air storage tank is a special equipment that needs to meet the rules of the TSG R0004-2009.