Fire separation distance between Class A warehouses/Class A workshops and the plant’s logistics pathways

In accordance with the requirements of the \"Fire Protection Design Code for Fine Chemical Enterprises\" (GB51283-2020): 1. The standard explicitly states that open flames or sources of ignition (including motor vehicles, etc.) shall not be installed in the explosion-hazardous areas of Class A warehouses and Class A workshops, and the distance from the main roads within the factory area must be at least 10 meters. However, in areas with explosion hazards (such as those where flammable or explosive gases or vapors are released), the explosion hazard radius specified in the relevant standard provisions must be met (for example, 15 m). Therefore, when a Class A warehouse/Class A workshop has explosion-hazardous areas and the distance between these areas is greater than the standard spacing (15 m in this case), fire safety measures should be implemented based on a distance of 15 m for those explosion-hazardous areas, rather than merely using the standard road spacing of 10 m. 2. Even if a fire arrestor is installed on a truck, it remains a motor vehicle, and the risk of open flames cannot be considered completely eliminated. Flame arresters are primarily used to prevent flames from spreading within pipes, but the engine and exhaust systems of the vehicle itself still represent potential sources of ignition; therefore, they cannot be used as a basis for reducing the distance between areas at risk of explosion or as an exemption clause. Therefore, even if the trucks entering the factory area are equipped with flame arresters, it is still necessary, in principle, to comply with the safety distance requirements between explosive hazard areas and the roads within the factory area; that is, the safety distance specified for explosive hazard areas must be maintained (15m in this case), and these requirements should not be reduced. In summary: - When there are explosive hazard areas (15m) in Class A warehouses/Class A workshops, the distance from the main logistics routes within the factory area should be 15m, rather than 10m ； - Even if a flame arrester is installed on the truck, it cannot be used to reduce the required 15m safety distance here. .

The fire separation distance should be 10 meters; it is sufficient if the spread of the explosive hazard area can be kept within 10 meters of the transportation roads. To avoid misunderstandings regarding the regulations among new enterprises, it is recommended to maintain a distance of 15 meters

10 meters; the explosion radius is determined based on the equipment where the leak occurs. The explosion range can be set at 4.5 meters. There are specific requirements regarding flow rate and pressure, as specified in GB50058