Which diagram is specifically used to depict process equipment with interconnected instrumentation?

• A. Piping and Instrumentation Diagram
• B. Process Flow Diagram
• C. Isometric Diagram
• D. Block Diagram

Answer: (A)

The diagram used to depict process equipment with interconnected instrumentation is the Piping and Instrumentation Diagram, abbreviated P&ID. This type of diagram specifically integrates equipment like vessels and piping with the instruments, sensors, valves, and control loops that connect to them. It shows how instrumentation ties into each piece of equipment, where control lines run, the tags for instruments, and how the process is controlled and monitored, which is essential for design, operation, and safety.

Other diagrams serve different purposes. A Process Flow Diagram maps the overall process steps and material streams but doesn’t include the detailed instrumentation or interconnections. An Isometric Diagram provides a 3D view of piping for fabrication and installation, focusing on layout rather than control details. A Block Diagram offers a high-level functional representation of systems and signals, not the actual equipment or instrumentation interconnections.