A question regarding the safety section
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Since organic solvents such as benzene are used, measures such as ventilation and exhaust systems are implemented. How should this be described? This is what I said, but the experts criticized me harshly :( 1. Design principles: Ventilation in the production workshops, as well as in the warehouses for raw materials and finished products, should primarily rely on natural ventilation; local mechanical ventilation should be considered only when natural ventilation is insufficient. The selection of electrical equipment for mechanical ventilation systems shall comply with the requirements of GB50058-92 \"Code for Design of Electrical Installations in Flammable and Explosive Environments\" and GB50016-2006 \"Code for Fire Protection Design of Buildings\". 2. The design specifies that the ventilation rate in the production facility should be no less than 8 times per hour, and during emergencies it should be no less than 15 times per hour, in order to improve the working environment. (8 and 15 are my estimates; there is no basis for these figures.) Do experts have any good suggestions?
Experts criticize your reasons because: 1. The first and second points are contradictory to each other； 2. Organic solvents such as benzene are used in the workshop (note that it is not an outdoor installation); therefore, ventilation should not rely primarily on natural ventilation, but rather forced ventilation should be implemented.
Benzene is used in the workshop; therefore, the electrical equipment used must be explosion-proof, and its rating and category must meet the required standards. As a design special section, it is not just about design principles; rather, it is necessary to provide a detailed description of the safety measures you have adopted.
As a specialized facility for safety, its design must take into account specific production conditions as well as processes, technologies, and raw materials and auxiliary materials. Product features include accurate and clear selection of safety equipment as well as the implementation of appropriate safety measures; it cannot be summarized merely by referring to provisions in certain laws or regulations! !
If you get scolded a few more times, you’ll change. The safety measures designed need to be specific; isn’t there a list of safety measures? Make sure everything is consistent, and don’t create contradictions on your own – otherwise you’re bound to get scolded
Can design exist without a basis? How can one create good design based on assumptions alone? I assumed the factory building had ventilation at 300 times per hour as well. When doing design, one must be extremely meticulous, meticulous, meticulous, meticulous, meticulous. Creating a special section on safety is essentially a form of design work; there are various requirements and conditions to meet. Who is going to help you solve the problems? The current design features a lifetime responsibility system, and the main point is to benefit you. According to clause 6.1.5.1 of the Health Standards for the Design of Industrial Enterprises GBZ 1-2010, “a) When the vapors of several solvents (benzene and its derivatives, alcohols, or acetates) or several irritating gases are released into the air simultaneously, the total volume of air required for overall ventilation should be calculated based on the sum of the amounts of air needed to dilute each type of gas to its specified exposure limit.” In addition to the aforementioned harmful gases and vapors, when other harmful substances are also released into the air, the ventilation volume should be calculated based solely on the harmful substance that requires the largest amount of air. ” **According to Article 2.3.1 of the Code for Design of Electrical Installations in Flammable and Explosive Environments (GB 50058-92): “1. When there are flammable substances in the factory building that are heavier than air, the ventilation rate in such buildings shall be no less than 2 times per hour, and ventilation must not be hindered.” ； The concentration of the flammable gas formed by the air with a volume of 1 m³ at the floor level of the factory building, in combination with the flammable substances released into the building, should be below the specified lower limit. ” Code for Design of Heating, Ventilation and Air Conditioning (GB50019-2003): 5.3.10 “In industrial buildings that emit heat, steam, and harmful gases simultaneously, or only harmful gases with a density lower than that of air, in addition to local exhaust systems, natural or mechanical general exhaust should be provided from the upper areas; the exhaust volume shall not be less than one air change per hour...” 5.4.3 “The volume of exhaust air for emergency situations should be determined through calculations based on the requirements of the process design, but the number of air changes per hour shall not be less than 12.” ”
Since you rely mainly on natural ventilation, how can you ensure that it occurs 8 or 15 times per hour?