Mixed device

I understand what you mean; having Class A areas mixed with Class D and E areas does indeed make people feel uncertain. According to petrochemical regulations, the fire separation distances, explosion resistance requirements, and electrical explosion protection zones for Class A facilities all need to be considered separately. In particular, the following points should be taken into account: Fire separation distances: There must be fire separation distances between Class A areas and adjacent Class D and E areas, as specified in the regulations; these distances include those between buildings as well as those indicated on the site plan, and they must not be ignored just because the scale of the site plan is large. Civil engineering blast resistance: The buildings or enclosures that house Class A installations (such as Stations 1/3) need to be designed with blast resistance in mind, while such requirements are generally not applicable to Class D and E areas. Structural isolation at the junctions between these areas is necessary to prevent the impact of explosion shock waves. Electrical explosion protection: Electrical equipment in Class A areas must meet the requirements regarding explosion protection ratings. Proper isolation of wiring is also necessary to avoid the risk of sparks being generated when the wires pass through Class D and E areas. It is recommended that you refer to the specific provisions of the \"Code for Fire Protection Design of Petrochemical Enterprises\" (GB 50160), and it’s best to consult experienced professionals from chemical engineering design firms or qualified code review engineers, as safety is no trivial matter.

This mixed arrangement of \"one Class A unit and the rest as Classes D and E\" does indeed pose special risks in the context of the fire protection design standards for petrochemical enterprises (GB 50160, referred to as the \"Petrochemical Standards\"). Although the \"Petrochemical Regulations\" simplify fire hazards into three categories: Class A, Class B, and Class C (with more detailed classifications for flammable gases/liquids), when a facility contains both high-risk Class A areas and low-risk Class D and E areas, it cannot be treated as having a low overall risk level. Professional design is required, following the principles of \"applying the higher standard\" and \"zoning for separation\".