Code for Fire Protection Design of Buildings--I can’t understand it
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I’m a beginner; I don’t understand this sentence: 3.3.7 Production facilities of categories A and B should not be located underground or semi-underground. Class A and Class B warehouses should not be located underground or semi-underground. What this sentence means is: 1: Production facilities for Category A and Category B products – namely those products belonging to Categories A and B – should not be located underground or semi-underground. 2: Production facilities in which Class A and Class B substances are used in reactions, but the resulting products are not of those classes, should not be located underground or semi-underground. 3: Production sites where the substances involved in the reaction are not of Category A or B, but the products produced are of Category A or B, should not be located underground or semi-underground. Dear teachers, is it the understanding mentioned above, or are all of the understandings mentioned correct, or is only some of them correct? Please let me know ? ? ?
This post was last edited by jintchinssen on 2011-6-10 at 10:55. The classification of fire hazards in production sites is determined based on factors such as the properties and quantities of substances used or generated in production. In response to LZ’s question: Class A and Class B production sites? I. The following conditions need to be considered comprehensively: 1) The properties of all raw materials used in production ； 2) Will changes in operating conditions during production alter the properties of the substance? ； 3) Properties of all intermediate products generated during production ； 4) Properties of the final products manufactured and their by-products ； 5) Environmental conditions during the production process. As long as one of the above conditions meets the requirements for Category A or Category B as specified in Article 3.1.1, a preliminary judgment can be drawn. II. Meanwhile, in conjunction with Article 3.1.2, a final determination is made as to whether it belongs to Category A or Category B production sites. One more thing: when studying standards, be sure to pay attention to the explanatory notes; this will help you understand why certain things are done in that way and also facilitate flexible handling in practical work.
What was said on the 2nd floor is correct, but it also depends on the quantities of Class A and Class B substances; if the quantities are insufficient, downgrading is possible, as specified in the fire safety regulations.
Generally, few companies build Class A and B workshops underground, as this can lead to the accumulation of flammable gases, especially those that are heavier than air; such gases cause more severe explosions, and it also becomes more difficult to escape in such situations
The original poster probably doesn’t understand how to distinguish between the fire hazard classification of production sites and that of storage areas (warehouses). For classification, it is first necessary to determine what items are present in the production area and the warehouse, and then classify them in accordance with the standards outlined in 3.1.
Production raw materials, intermediate products, by-products, and finished products that belong to categories A and B should not be located underground or semi-underground. Because hazardous substances tend to accumulate in underground or semi-underground areas, and it is difficult for them to disperse, dangers can easily arise.