Issues related to vinyl chloride in container classification
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In the book \"Classification of Toxicity Hazards and Explosion Risks of Chemical Media in Pressure Vessels,\" vinyl chloride is classified as a chemical medium with moderate hazard, but the notes state: \"When the toxicity classification is used to determine the technical requirements for the sealing and integrity of pressure vessels, vinyl chloride should be classified as a chemical medium with extremely high toxicity.\" ”So, how should it be classified? I ask those who are more knowledgeable to give me some guidance.
Moderate. Of course, there are ways to make it mild even when the pressure is not high.
Classification is done as medium hazard, but a airtightness test is required.
In August 1994, a design institute designed a product tank for use with ethylbenzene as the medium; the design pressure was 0.28 MPa, the design temperature was 60°C, and the volume was 58.1 m3. This tank was classified as a Class 1 pressure vessel. The designer considered ethylbenzene to be a medium-hazardous substance, and mistakenly classified this tank as a Class 1 pressure vessel despite it being a low-pressure vessel. According to the standards HGJ43-91 issued by the Ministry of Chemical Industry, titled \"Classification of Toxicity Hazards and Explosion Risks of Chemical Media in Pressure Vessels,\" benzene should be classified as a chemical medium with high toxicity when such classification is used to determine the technical requirements regarding the integrity and sealing of pressure vessels. Therefore, this product tank should be classified as a Class III pressure vessel in accordance with Article 4, Paragraph 3.1 of the Pressure Vessels Regulations. When searching on Baidu, I find the above information. I also want to know whether, when something is classified as highly hazardous, it should only be applied to the selection of flanges, gaskets, etc., or should it also be used for classification purposes.~~~~~ I hope experts can give some guidance
Is ethylbenzene the same as benzene? If the properties are the same, then the designer’s classification is incorrect; the classification should be based on severity level, with emphasis being placed on sealing performance – in other words, a gas-tightness test needs to be considered. As for the flange gasket, I think a medium level is sufficient.