Classification of pressure vessels

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Container specifications: Classification of pressure vessels into categories 1, 2, and 3. The \"Regulations on Safety Technical Supervision of Fixed Pressure Vessels\" (TSG21-2016, hereinafter referred to as the \"Fixed Pressure Vessel Regulations\", commonly known as the \"Major Vessel Regulations\" in the industry) issued by the General Administration of Quality Supervision, Inspection and Quarantine (hereinafter referred to as the QAQI Administration) classify pressure vessels into three categories based on factors such as the operating pressure of the vessel, the hazard level of the medium involved, the function of the vessel, its structural characteristics, the materials used, and the overall impact on the vessel’s safety performance. . (1) Category I pressure vessels: Low-pressure vessels (except as specified in paragraphs (2) and (3)). (II) Class II pressure vessels (one of the following situations, except as specified in paragraph (III)): (1) Medium-pressure vessels ； (2) Low-pressure vessels (only for media with extremely high and high toxicity) ； (3) Low-pressure reaction vessels and low-pressure storage vessels (only for flammable media or media with moderate toxicity) ； (4) Low-pressure shell-and-tube waste heat boiler ； (5) Low-pressure glass-lined pressure vessels. (III) Class III pressure vessels (one of the following situations): (1) High-pressure vessels. (2) Medium-pressure vessels (only for media with extremely high and high toxicity) ； (3) Medium-pressure storage vessels (only for flammable or moderately hazardous media with pV greater than or equal to 50 MPa·m3) ； ***Examples of such regulations include: (3) Low-pressure reaction vessels and low-pressure storage vessels (only for flammable media or media with moderate toxicity) ； (4) Low-pressure shell-and-tube waste heat boiler ； (5) Low-pressure glass-lined pressure vessels. It is not specified in the fixed volume gauge. May I ask which regulation this is based on?