Consultation on petrochemical regulations
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In the petrochemical code GB50160, there have been several questions: (1) In clause 3.0.1, if a substance is in a liquid state at normal conditions – for example, it belongs to Category B liquids – but the explosion limit of its vapor is less than 10%, should such vapor be classified as Category A? Is there such a practice? (2) Article 3.0.2 explains the increased fire hazard associated with flammable liquids whose operating temperature exceeds their flash point or boiling point. However, there are special cases: for example, during vacuum distillation, the temperature is lower than both the boiling point and the flash point, yet a large amount of vapor is still present. In such situations, should the fire hazard of these flammable liquids also be increased accordingly? I’m not very clear about the concept; please give me some guidance.
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The classification of a substance’s fire hazard is determined under normal storage conditions: combustible gases are classified as such, while liquids are classified as liquefied hydrocarbons or combustible liquids. If the operating temperature exceeds the substance’s flash point or boiling point, its fire hazard category is elevated in that temperature range. 1. If a substance is a liquid at room temperature, classified as Category B, it still depends on the operating temperature; if the temperature exceeds the flash point or boiling point, then Rule 3.0.2 applies. 2. Rule 3.0.2 refers to the operating temperature and has nothing to do with vacuum distillation – it is still necessary to check whether the temperature during vacuum distillation exceeds the substance’s flash point or boiling point. The flash point and boiling point of a substance are physical constants, not values determined in the specific environment in question