Questions regarding the definition of pressure vessels
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Conditions: The medium inside the container is heat transfer oil; the tank is not filled to capacity, with daily operation at around half capacity. The operating pressure is greater than 0.1 Mpa, the operating temperature is below the standard boiling point of the heat transfer oil, and the volume is 15 m3. Question: Can a container that meets the above conditions be classified as a pressure vessel, given that half of its interior is occupied by the gas phase and its operating pressure is greater than 0.1 Mpa?
Firstly, this device is considered a pressure vessel regardless of whether it has a gas phase space or not. Although its operating temperature is below the standard boiling point of heat transfer oil, if the gas phase space is 0.03 cubic meters or more, it falls under the regulations applicable to pressure vessels.
Whether there is a gas space or not, it is still considered a pressure vessel. Although the operating temperature is below the standard boiling point, if the gas space volume is 0.03 cubic meters or more, it is considered a pressure vessel governed by the fixed-volume regulation.
Whether this equipment constitutes a pressure vessel and whether it falls within the scope of application of TSG 21-2016 \"Regulations on Pressure Vessels\" are two distinct categories; there is a connection between them, but they are also different from each other. The announcement issued by the General Administration of Quality Supervision, Inspection and Quarantine regarding the revision of the \"Catalogue of Special Equipment\" (No. 114, 2014) contains a definition of pressure vessels: Pressure vessels refer to enclosed devices that hold gases or liquids and are subjected to certain pressures. Such vessels include fixed and mobile containers whose maximum working pressure is 0.1 MPa (gauge pressure) or higher for gases and liquefied gases, and whose maximum working temperature is equal to or higher than their standard boiling point; in addition, these vessels must 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. ） ； As for whether it falls within the scope of application of TSG21-2016, follow Clause 1.3 of these regulations. The scope of application of TSG 21-2016 applies to pressure vessels, but the range of pressure vessels covered is broader than that defined by TSG 21-2016; TSG 21-2016 applies only to fixed pressure vessels (those that are installed in a fixed location for use).
This post was last edited by Zhang Junli on 2020-3-16 at 16:47. The medium in question does not meet the requirements; it is not a pressure vessel. Everyone upstairs doesn’t even read the \"Catalogue of Special Equipment\" and just talks nonsense. Vessel spaces with a volume of ≥0.03 m3 are also considered pressure vessels. In other words, there is a gas phase space with a pressure of ≥0.1 MPa and a volume of ≥0.03 m3.
Where does the pressure come from? If the pressure exceeds 0.1, then it is considered a pressure vessel.