Question

What are the three principal types of diagrams used by process engineers to describe the flow of chemicals in a process? On which of these diagrams would you expect to see the following items?

• The temperature and pressure of a process stream

• An overview of a multiple-unit process

• A major control loop

• A pressure indicator

• A pressure-relief valve

Answer 1

The three principal types of diagrams used by process engineers are:

 

1. Process Flow Diagrams (PFDs)

2. Piping and Instrumentation Diagrams (P&IDs)

3. Process and Instrumentation Diagrams (P&IDs)

 

• Temperature and pressure of a process stream: P&IDs

• Overview of a multiple-unit process: PFDs

• Major control loop: P&IDs

• Pressure indicator: P&IDs

• Pressure-relief valve: P&IDs