How to determine this container category

The design pressure is 0.6 MPa with a volume of 10 m3; according to the new regulatory standard TSG21-2016, it is classified as Category II if it contains toxic substances； If containers filled with other media are considered a separate category

Category 2: Chinese name: Bromine; English name: Bromine; Other names: Bromine, liquid bromine; Molecular formula: Br2; Molecular weight: 159.8; CAS No.: 7726-95-6; Relative density: 3.119 (20 °C); Melting point: -7.2 °C; Boiling point: 58.78 °C; Properties: Bromine is a red-brown fuming liquid. At low temperatures (-20°C), it appears as metallic-brilliant, dark red needle-like crystals of bromine (Br). It evaporates rapidly at room temperature; its vapor has a strong, suffocatingly pungent odor and is red-brown in color.

I would like to ask how it is classified and what the criteria for making such judgments are

The key is which type of medium...

Recommendation: For those with extensive requirements, refer to TSG21-2016. Shortcut: Download a small software at http://bbs.hcbbs.com/thread-1622941-1-1.html

This post was last edited by allforum on 2016-9-29 at 10:53. Classifying it as Category II is reasonable; the key lies in classifying the medium – whether it is extremely or highly hazardous, whether it is explosive, and whether it is liquefied gas.

That’s right; the key is whether the medium belongs to the first group or the second group. According to Code A1.1, (1) the first group of media includes chemical substances with an extremely high or high level of toxicity, explosive materials, and liquefied gases ； (2) The second group of media, the media other than those in the first group. A1.2.3 Determination of the toxicity hazard level and explosion risk level of media: It is determined in accordance with HG 20660—2000 \"Classification of Toxicity Hazards and Explosion Risks of Chemical Media in Pressure Vessels\". For HG 20660, no specific provisions are given; the pressure vessel design unit shall determine the medium category in accordance with the principles of GBZ 230—2010 \"Classification of the Hazard Levels of Occupational Exposure to Toxic Substances\". Bromine has a strong irritant and corrosive effect on the skin and mucous membranes. Health hazards · Occupational exposure limit: PC-TWA 0.6 mg/m3 ； PC-STEL2mg/m3 · LDLH: 3ppm · Acute toxicity: Oral LD50 in rats is 1700mg/kg ； Inhalation of LC50 at 2700 mg/m3 in rats can lead to absorption through the respiratory tract, digestive tract, and skin. It has strong irritating and corrosive effects. Its vapor irritates the mucous membranes, causing tearing, coughing, dizziness, headaches, and nosebleeds; at high concentrations, it can also lead to bronchitis, pneumonia, pulmonary edema, and suffocation. When ingested, it causes burns to the digestive tract. The liquid can cause burns to the eyes and skin. Copyright information: This article is from the Occupational Health Network: http://www.zywsw.com/. Toxin information regarding bromine cannot be found in HG 20660-2000, but based on the information above, it can be concluded that bromine is toxic, though not lethal – its toxicity is at most moderate – hence it falls into Group 2 of regulated substances. Code requirements mandate that the pressure vessel design entity determine the medium category; meanwhile, clause 3.1.3 on design conditions requires the client commissioning the design to provide information on the composition and properties of the medium, which should include the toxicity level of the medium (grades I to IV, or non-toxic). The poster can ask the design client to provide information on the toxicity level of bromine.

Bromine is toxic, with moderate toxicity; therefore it falls into Category I containers. At such pressure and temperature, the calculated wall thickness does not meet the requirements for heat treatment, so heat treatment is not necessary