The issue of gas toxicity classification used in design
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Some time ago, I built a methanol separator with a design pressure of 6.1 NPa and a design temperature of 100 degrees Celsius; the working media in it are syngas and crude methanol. Syngas components: H2 66.985% ； CO 10.034% ； CH3OH 0.723% ； CO2 2.782% ； N2 9.957% ； CH4 5.291% ； Ar 4.0835% ； H2O 0.145% ； Hydrogen partial pressure 3.1~4.0 MPa (G). Crude methanol component: CH3OH 96.28% ； H2O 3.72%. The toxicity value shown in the data sheet provided by the manufacturer is classified as highly hazardous, but according to standard specifications and previous methanol separators, it should be considered moderately hazardous. Could someone please tell me which category this should be assigned to? What is a sentence?
It should be classified as highly hazardous, based on the H2 content
Regarding methanol, although it poses a moderate level of hazard and this equipment is used for methanol separation, both H2 and methanol are flammable and explosive substances; however, H2 is not a toxic substance.
Class 3 pressure vessels do not need to be designed as toxic equipment
Agree with the opinion on floor 3. Methanol is classified as having moderate hazard, while hydrogen is an explosive and hazardous substance; neither of them reaches the level of high hazard. Perhaps the process is just a reminder for designers to pay attention to it. You can **talk to him**.
I also think it should be classified according to methanol’s moderate level of hazard. As for H2, the explosion hazard category indicated in its data sheet refers to it as a flammable and explosive substance; it has nothing to do with toxicity. As for the three types of containers mentioned on the 4th floor, my design corresponds to type two containers; it does not fall under type three