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I. On the P&ID diagrams for process pipelines, the pipes for auxiliary materials and utility materials are represented as only short sections of connecting pipes, and the numbering method is as follows: 1. According to the sequence of the P&ID diagrams for each process step and the order of the processes, each type of auxiliary material or utility material pipe is numbered individually, with the pipe numbering starting from 01 (or 001). 2. In the second part of the pipeline number, the process (main item) number for the project is the process number of the step at which that common material is generated. 3. Each piece of equipment (including backup units), as well as the connection pipes for auxiliary materials and utility materials on the process pipelines, must be assigned a pipeline number. These auxiliary material and utility material pipes are usually not connected to one another; they represent only short sections of connecting pipes, such as the high-pressure steam and nitrogen pipes shown in Figure 6-1. 6-1 Numbering and labeling of pipelines for auxiliary materials and utility materials: 4. The pipeline numbers with series codes follow the rules mentioned above, but they do not indicate the distribution or collection main pipes for auxiliary materials and utility materials, as shown in Figure 6-2. 6-2 Numbering and labeling of pipes with serial numbers for auxiliary materials and utility materials. II. There are two scenarios regarding the numbering of pipes on the piping and instrumentation diagram (P&ID) for auxiliary materials and utility materials. 1. For common materials, the numbering and labeling methods for the pipe numbers of auxiliary materials belonging to a certain main category and of main common material pipes are in accordance with the regulations stated earlier. 2. For other types of auxiliary materials and utility material pipelines that are not part of the main categories, as indicated on the diagram, the numbering and labeling methods follow the regulations mentioned above. III. Where there are process steps and utility material handling steps (or receiving steps) within the plant area, pipeline numbers are assigned according to the following two scenarios. 1. For pipelines of auxiliary materials and common materials that connect two or more processes, whether going to or coming from these processes, the process number should be that of the process where such auxiliary materials or common materials are generated (or received) (as shown in Figure 6-1 with the process number “07”). Whether they are within the scope of the equipment design or provided by the user within the equipment area. 2. Starting from the auxiliary materials that enter or leave the processes where utility materials are generated (or received), as well as the pipelines for these utility materials (also known as auxiliary material or utility material main pipes, such as pipes CW S-7001 and CWR-7001 in Figure 6-3), up to the last process step (such as steps 3 and 5 in Figure 6-3), it is necessary to assign a pipe identifier that is different from the overall (main) pipe identifier for that process step – for example, CWS-3001, CWR-3001, CWS-5001, and CWR-5001 – as shown in Figure 6-3. 6-3 For processes within the unit that share a common material supply system, the numbering and labeling of the pipes are as follows (there are no inlet or outlet main pipes within the unit’s boundary). In both of these cases, the boundary between the pipe numbered “7” and the pipes belonging to other processes can be marked at any (specific) location on the main pipes within (or outside) those other processes; a boundary symbol is used on the PI diagram to indicate this separation in the pipe numbering. IV. The numbering of auxiliary material and utility material pipes (main pipes) that come in from outside the equipment area or go out to areas outside it can be determined in accordance with the provisions in 6-3. That is, a \"process\" number specific to a particular project is assigned to the main pipes for auxiliary materials and utilities that enter or leave the area, and the equipment, instruments, and special fittings attached to these main pipes are also numbered using this project’s \"process\" number (as shown as \"7\" in Figure 6-3).