The fire hazard of phosphorus trichloride is Class A!
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This post was last edited by shiworkstation on 2020-4-22 at 11:10. According to page 74 of the \"Fire Protection Design Standards for Fine Chemical Enterprises\" (GB 51283-2020), the fire hazard classification of phosphorus trichloride is Class C A! This is wrong, right? What do you all think?
Up there, are you joking? It decomposes violently when exposed to water, generating a lot of heat and thick smoke; it may even explode. It should be Category 4 under 50016. Since he wrote that down, we should follow the actual conditions of the project. After all, the premise of fine chemical processing is that the quantities used are small, though warehouses are another matter
Class A4 is rather far-fetched – it explicitly states that flammable gases are produced when in contact with water, which then leads to combustion or explosion. In reality, the flammable gases might be hydrogen generated when the acids released come into contact with metals. It also doesn’t fall under Class A according to building codes. But after all, it’s those who create the codes that decide such things; it’s just like whoever has more power decides what counts – nonsense that ends up winning out.
It says this online; I’m not sure if it’s true or not. “Phosphorus trichloride is an important inorganic salt used in industry. It is a colorless liquid with a density of 1.574 g/cm3 at 21°C, a melting point of -112°C, and a boiling point of 75.5°C. It is flammable. When it comes into contact with water, it reacts to form phosphorous acid (H3PO3) and hydrogen chloride; it can also catch fire when in contact with organic substances.” From this post, it seems that the design institute also has doubts: https://wenda.guidechem.com/question/detail603639.html
The fine gauge was classified as Category C. I remember some accident occurring; it is non-flammable on its own, but it produces acid when in contact with water, and when it comes into contact with metals, it releases hydrogen gas that can cause explosions. That’s why the standards were formulated to include it in this category Specifically, one should ask the people responsible for drafting the standards; according to the classifications in building codes, there are conflicts, right?