Definition differences between gas cylinders and pressure vessels
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I’m not an expert in equipment, so I’d like to ask: Do the instrument air storage tanks that come with on-site instruments and valves fall under the category of pressure vessels or gas cylinders? Under what category should the registration procedures be carried out? Both volume and pressure seem to meet the definitions for both
A gas cylinder is a portable pressure vessel that can be refilled repeatedly under normal conditions (–40 to 60°C), with a nominal working pressure of 1.0 to 30 MPa (gauge pressure) and a nominal volume of 0.4 to 1000 L, and is used to hold permanent gases, liquefied gases, or dissolved gases.
Check the fixed capacity regulations; they specify the applicable ranges for various types of special equipment
A pressure vessel is a term with a broad definition; gas cylinders are a type of pressure vessel
Pressure vessels include fixed pressure vessels, mobile pressure vessels, and various gas cylinders
To solve your problem, you don’t have to start with the definition. Instead, you should look at the manufacturing information on the label of your device; gas cylinders have their own technical specifications and standards, and containers have theirs as well. By attaching the label information, everything will be clear at a glance.