What type of diagram shows the major piping associated with a process?

The Process Flow Diagram (PFD) is specifically designed to illustrate the major piping and the flow of processes within a system. It provides a visual representation of the relationship between the various components in a process, such as pumps, valves, compressors, and storage tanks, as well as the direction of flow.

In addition to showing the major piping, a PFD often includes information on the operating conditions, the physical relationships between equipment, and the identification of process streams. This diagram simplifies complex processes and serves as a fundamental reference for operators and engineers, aiding in the understanding of how a system operates at a holistic level.

While other types of diagrams exist, each serves a different purpose. Utility diagrams typically focus on services such as water, air, and electricity rather than the specific processes. Control flow diagrams emphasize the control logic and sequences rather than the physical flow of process materials. Instrumentation diagrams provide detailed information about instrumentation and control systems but do not focus as extensively on the major piping layout. Therefore, the PFD is the most appropriate choice for representing the major piping associated with a process.