Is an air storage tank considered a special equipment?

According to the **definition of pressure vessels, a pressure vessel is a sealed device used to hold gases or liquids and is subjected to certain pressures. It includes fixed and mobile vessels whose maximum operating pressure is 0.1 MPa (gauge pressure) or higher for gases and liquefied gases, and whose maximum operating temperature is equal to or higher than their standard boiling point; such vessels also have a volume of 30 L or more and an inner diameter of 150 mm or more (for non-circular cross-sections, this refers to the largest geometric dimension of the cross-section)； Gas cylinders, liquefied gas cylinders, and cylinders for 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. From the above definition, it can be seen that: 1) if an air storage tank does not meet the requirements for a pressure vessel, then it is not a pressure vessel and therefore does not need to be classified as a special type of equipment. If the gas stored in the gas tank is compressed air, with a pressure of less than 0.1 MPa and a volume of less than 30 L, it does not qualify as a pressure vessel and therefore does not need to be regulated as a special type of equipment. 2) If the gas storage tank meets the requirements for pressure vessels and is classified as such, then the gas storage tank is considered a special equipment. If the gas in the gas storage tank is compressed air, with a pressure of 1 MPa and a volume of 2000 L, it constitutes a pressure vessel and should be managed as special equipment. Therefore, it is still necessary to treat them differently in order to avoid work mistakes.

It falls under the category of pressure vessels, as its pressure and volume meet the criteria defined for such vessels.

There is a prerequisite: the nominal working pressure under full load must be greater than or equal to 0.2 MPa (gauge pressure), and the product of pressure and volume must be greater than or equal to 1.0 MPa·L; therefore, it does not qualify. Of course, such cases are not common; they do exist, especially in smaller containers

Not a pressure vessel. Focus: Fixed and mobile containers for gases and liquefied gases with a maximum operating pressure of 0.1 MPa (gauge pressure) or higher, and liquids with a maximum operating temperature equal to or higher than their standard boiling point; as well as containers with a volume of 30 L or more and an inner diameter (for non-circular cross-sections, this refers to the largest geometric dimension of the cross-section) of 150 mm or more ； Only those that meet all the above conditions can be considered pressure vessels.

I don’t know what the operating pressure is? →_→No solution

It is recommended to study the relevant regulations carefully; the introduction to these regulations defines pressure vessels, and this definition is relatively new – a vessel is considered a pressure vessel only if it meets certain conditions. So this issue isn’t really an issue. PS: The working pressure referred to in the definition of pressure vessels is not the design pressure.

It definitely counts; it belongs to the category of pressure vessels

It can be calculated based on the conditions specified in the general regulations, and then compared with the definitions； There are always instructions accompanying the purchase of such equipment; for special equipment, there are requirements regarding the drawings or manuals provided.