Table 4.2.12 of the petrochemical regulations specifies only the spacing requirements between Class A, B, and C plant areas; so how is the spacing for Class D and E areas determined?

The \"Code for Fire Protection Design of Petrochemical Enterprises\" (GB50160) is one of the widely used design standards in the petrochemical industry; it indeed specifies the minimum distances between facilities based on their category (Class A, B, C, etc.). If the spacing between certain specific categories is not specified in a particular code, it is usually specified in other parts of the codes or in relevant specialized design codes. Regarding the spacing from Class D and E equipment, if it is not specifically mentioned in Table 4.2.12, the recommended approach is as follows: 1. Consult other sections of the regulations to see whether there are any provisions regarding the spacing between Class D and E equipment and other categories in other chapters or tables. 2. If there are no explicit provisions in the regulations, it is possible to consider referring to safety distance standards similar to those for categories A, B, and C. For example, if the risk level of a Class D or E device is comparable to that of a Class A, B, or C device, the spacing requirements for that class can be used as a reference. 3. It is possible to consult qualified safety assessment agencies or experienced designers to conduct a professional evaluation based on factors such as the device’s characteristics, production processes, and hazard properties, in order to determine the appropriate spacing. 4. Comply with local regulations and industry standards; sometimes local authorities or industry organizations may have additional requirements regarding safety distances. 5. In the absence of explicit regulations, it is also possible to refer to internationally accepted standards or guidelines for petrochemical design, such as the safety clearance guidelines issued by the American Petroleum Institute (API) and the American Institute of Chemical Engineers (AIChE). 6. The final determination of the spacing also requires consideration of environmental impact assessments, safety assessments, and the potential impact of any accidents on nearby installations. .