Regarding stainless steel pressure vessels

You can check whether it is possible to do so in accordance with the regulations set out in the Safety Technical Inspection Regulations for Pressure Vessels. It’s not quite clear exactly how to do it. I’m not very familiar with this aspect.

Article 2 of the “Regulations on Safety Technical Inspections for Pressure Vessels”: The scope of application of these regulations is as follows: 1. These regulations apply to pressure vessels that meet the following conditions: (1) The maximum operating pressure (Pw) (Note 1) is greater than or equal to 0.1 Mpa (excluding hydrostatic pressure; the same applies hereafter); (2) The inner diameter (for non-circular cross-sections, it refers to the largest dimension) is greater than or equal to 0.15 m, and the volume (V) (Note 2) is greater than or equal to 0.25 m3; (3) The medium contained is a gas, liquefied gas, or a liquid whose maximum operating temperature is greater than or equal to its standard boiling point..(Note 3) 2. Chapters 3, 4, and 5 of these regulations apply to the following pressure vessels； (1) Storage tanks or cylinder banks in boiler rooms that are not independent of mobile compressors and have a volume of 0.15 m3 or less; (2) High-pressure vessels with a volume of less than 0.25 m3; (3) Non-independent pressure vessels in cryogenic units, pressure vessels in direct-fired absorption refrigeration units, and cryogenic chambers in air separation equipment ； (4) Spiral plate heat exchanger ； (5) Air tank in hydraulic automatic air-supply pressure water supply (towerless water supply) systems, gas or pressure water supply (foam-based) tanks in fire protection systems ； (6) Pressure vessels for ion exchange or filtration in water treatment equipment, expansion tanks for hot water boilers ； (7) Fully enclosed vertical combined electrical apparatus (capacitor pressure vessel) dedicated for the power industry ； (8) Tire vulcanizing machines and pressure-resistant rubber molds for rubber products. 7 MPa falls under the category of high-pressure vessels; to avoid being classified as such, it can be considered part of an overall system as another type of equipment. Such as the cylinders of an air compressor

General concept of pressure vessels: Any closed container that holds pressurized media. Pressure vessels subject to regulatory oversight are referred to as: regulated vessels ； Pressure vessels governed by GB150 are referred to as: GB150 pressure vessels ； The poster is probably asking whether it is a vessel subject to regulatory requirements, and whether it can be inspected based on pressure, the medium used, and whether the maximum operating temperature complies with the relevant regulations.

1. Please correct the statement regarding Building 3#: A vessel with a pressure of 7 MPa is not a high-pressure vessel, but rather a medium-pressure vessel. 2. If LZ wants a container operating under conditions of a pressure of 7.0 MPa and a volume of 1 L not to be classified as a pressure vessel, there is only one way to do this: the medium contained within the container must be a liquid, and its maximum operating temperature must be below its standard boiling point. 3. Another method is to turn a container with a volume of 1 L into a pipe with an inner diameter of less than 150 mm. 4. In fact, given LZ’s current conditions, it is no longer a pressure vessel subject to the Regulatory Requirements! Note: Excerpt from Article 2, Paragraph 1, item (2) of the Regulations: The inner diameter (for non-circular cross-sections, this refers to their maximum dimension) is greater than or equal to 0.15 m, and the volume (V) is greater than or equal to 0.025 m3 ； ” The 0.025 M3, which is equivalent to 25 L, is provided for reference only! This post was last edited by clguan on 2009-3-15 23:14]

Strength calculations can be verified using the formulas for pressure pipeline design

As long as the inner diameter is less than 150 MM, it falls under regulatory control

After doing the calculations, if a 1-liter container has an inner diameter of 150 mm, its height can only be 56 mm; therefore, it seems that the container mentioned by lz should not fall under the regulations governing containers.

The container mentioned by LZ should not be subject to supervision under the Container Regulations; however, when using a 1L high-pressure tank at 7.0 MPa to store gases or liquefied gases, it is better to have it supervised by the local quality and technical supervision authorities, so as to ensure safety.

The classification of pressure vessels is related to the properties of the medium, as well as the vessel’s volume and design pressure! If its volume is small, high pressure doesn’t make it a pressure vessel!

:Lol, a container with a volume of 1L isn’t meant to be classified as a pressure vessel anyway. Moreover, it is medium voltage, not high voltage.