Chemical engineering design

I don’t know. Literally, they are divided into three categories: main materials, by-products, and utility services

Okay, thank you:handshake

This is my personal understanding, which may not be comprehensive; I hope everyone can provide additional insights. The pipes here are classified according to the extent to which the internal medium is involved in the entire system. Main process pipeline: The main working medium involved in the system reaction flows inside it. For example, in the sulfur-based acid production process, there is liquid sulfur, as well as the SO2 gas produced upon the combustion of liquid sulfur. These media participate in the reaction and are the main reactants for forming the final product. Secondary process pipeline: The substances involved in the reaction flow inside this pipeline. In the sulfur-based acid production process as well, oxygen is supplied as combustion air to assist burning; these substances participate in the reaction, but they are not the main components that make up the final product. Auxiliary process pipelines: These carry substances that do not participate in the chemical reactions, nor does there be any material exchange, but which are still necessary for the operation of the system. Such as circulating cooling water, compressed air for instruments, etc. By distinguishing between main process pipelines, secondary process pipelines, and auxiliary process pipelines, several advantages are achieved: during PID reviews, it is easier to locate the main process lines, and then it is simpler to examine the secondary and auxiliary process lines in relation to these main lines, thus making it easier to identify the key aspects. The same principle applies during the design phase: first complete the calculations for the main process, then carry out calculations for the secondary process pipelines based on that main process, and finally calculate the auxiliary process pipelines. This approach ensures that there is a clear hierarchy in the design, preventing confusion.

It seems that such a classification method does not exist in chemical engineering design; it is usually defined as the \"process and utility piping systems.\" As for determining the pipe sizes, this is closely related to the given flow rates, the diameter of the pipes, as well as the initial investment costs associated with the piping system (materials and installation), operating costs (energy consumption and maintenance), and depreciation expenses.

Thank you very much. What is the difference between the main process material pipeline and the main product pipeline?

Different companies have different design conventions; our company has always followed the global design specifications and PID layout diagrams, which generally classify pipes into main process pipes, secondary process pipes, and auxiliary process pipes. The main product pipeline you mentioned is probably defined by the design team itself; one needs to look it up in the design specifications.