Division of ethylbenzene containers
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I am currently working on a horizontal tank for ethylbenzene at atmospheric pressure, and I have some questions regarding its toxicity classification. I’m not sure what toxicity requirements ethylbenzene needs to meet. I searched for relevant information online, and the following sources were the most useful: 1. In August 1994, a design firm designed a product tank using 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 due to 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 Vessel Regulations. However, HGJ43-91 has been revoked, and the information provided takes benzene and ethylbenzene into account together. Is this approach feasible? The alternative standard 20660 also does not contain any corresponding requirements (perhaps they exist but I haven’t found them, sigh). How should this situation be handled? Is there any relevant basis for this?
:Lol, then look up the HG20660 standard to see how it classifies toxicity and flammability. As for the conclusions in the examples you gave, they are all wrong; it’s better not to look at them.
Personally, I believe that when determining the technical requirements for the integrity and sealing of pressure vessels, benzene should be classified as a chemically hazardous substance with a high level of toxicity; however, it is currently classified as having moderate toxicity. I’m not sure if my understanding is correct
It’s not that I’m superstitious about authority, but this was summarized by someone on the internet who claims to be responsible for overseeing safety inspections of pressure vessels. This example is one of those summarized by them. I’m a bit confused as well – in 20660, there is only a description of benzene, and I have doubts about the explanations given there. What exactly is the difference between ethylbenzene and benzene? The friend on floor 3 thinks the same as I do
In my opinion, such media should be classified as Category 3, namely highly hazardous chemical media, when subjected to high pressure and temperature, based on their toxicity level. The aforementioned product tanks should be classified as Category II.
I just checked – ethylbenzene is classified as an explosive hazard material according to HG20660; it is not considered a highly or extremely hazardous material. Therefore, when designing equipment of this type, the focus is on ensuring tightness, with the sealing of the equipment being the main issue to address； Classifying it into three categories is inappropriate.