Is the tank of an internal pump considered a pressure vessel? Is a permit needed?

In accordance with the provisions of the Law of the People’s Republic of China on the Safety of Special Equipment and the Regulations on the Supervision of the Safety of Special Equipment, the General Administration for Quality Supervision, Inspection and Quarantine has revised the Catalogue of Special Equipment, which is now promulgated and put into effect with the approval of the State Council. At the same time, the \"Notice on Publication\" (Guo Jian Zhi Guo [2004] No. 31) and the \"Notice on Adding to the Catalogue of Special Equipment\" (Guo Jian Zhi Te [2010] No. 22) are repealed. The “Catalogue of Special Equipment” is interpreted by the General Administration of Quality Supervision, Inspection and Quarantine. Its scope is defined as gases and liquefied gases with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, liquids with a maximum operating temperature equal to or higher than their standard boiling point, as well as fixed and mobile 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-sectional boundaries) of 150 mm or more ； 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. If the tank of an internal pump meets the above conditions, it is considered a pressure vessel. Whether a certificate is needed depends on whether the user is aware of it. In fact, there are those that issue certificates and those that do not.

First, look at the design documents for the tank; the pressure rating is definitely specified there. Additionally, it can also be determined based on the medium, operating pressure, and operating temperature; the second floor provided a very detailed explanation.

Clause 1.5 of the \"TSG 21-2016 Safety Technical Inspection Regulations for Fixed Pressure Vessels\" does not apply to the following vessels: (4) Pressure chambers that are integral parts of, or components in, mechanical equipment that undergo rotational or reciprocating motion (such as pump casings, compressor housings, turbine casings, hydraulic cylinders, paper mill rolls, etc.). As I understand it, the tank of the canned pump, the cylinder of the VS6 bag pump, and the casing of the shielded pump do not all fall under the category of pressure vessels.

It is necessary to check whether it falls within the scope of pressure vessels!