What does a P&ID show, and what do instrument tags and loop numbers represent in this context?

• A. P&ID shows electrical wiring diagrams; instrument tags indicate vendor; loop numbers are serials.
• B. P&ID shows piping, instrumentation, and process flow; instrument tags indicate instrument type and service; loop numbers map to control loops.
• C. P&ID shows only piping; instrument tags indicate maintenance urgency; loop numbers map to valve numbers.
• D. P&ID shows process flow but not instrumentation; instrument tags indicate location; loop numbers map to rooms.

Answer: (B)