“Let’s learn the standards together” — Petrochemical Standard 2.0.21
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Code for Fire Protection Design of Petrochemical Enterprises GB50160 2.0.21 Boil-over liquid: A viscous hydrocarbon mixture in which, as the temperature of the material stored in a tank rises, heat transfer causes the water layer at the bottom of the tank to vaporize rapidly, resulting in a boil-over phenomenon. As can be seen from the explanation of the provisions in the appendix, 2.0.21 refers to volatile liquids mainly such as crude oil, residue, and heavy oil. Question: What does the water layer at the bottom of the tank here refer to? ? Is it the water that is naturally present in crude oil, residue oil, and heavy oil? When stored in the tank, the oil and water separate, with the water settling at the bottom of the tank?
Including: adsorbed water, combined water, and free water contained in the oil； When stored in a tank, oil and water separate, with the water settling at the bottom of the tank. If the separated water floats on the surface of the oil, such a medium does not belong to the category of boiling liquids ； Such as coal tar, which has a density greater than that of water, with water separated above the surface of the coal tar liquid.