Chapter 12
PROCESS DIAGRAMS
OBJECTIVES
After studying this chapter, the student will be able to:
▪ Review process diagram symbols.
▪ Describe the use of process diagrams and the information they contain.
▪ Draw a process flow diagram.
CHAPTER 12 REVIEW QUESTIONS
1. Describe a process flow diagram and a process and instrument drawing. Answer: A
process flow diagram uses process symbols to describe the primary flow path through a
2. Draw the symbols for a gate, globe and automatic valve. Answer: See Figure 12.10.
3. Draw the symbols for a centrifugal pump and a positive displacement pump. Answer:
4. Draw the symbols for a blower and a reciprocating compressor. Answer: See Figure
12.12.
5. Draw the symbols for a steam turbine and centrifugal compressor. Answer: ee Figure
12.12.
6. Draw the symbols for a heat exchanger and a cooling tower. Answer: See Figure 12.13
& 12.14.
7. Draw the symbols for a packed distillation column and plate distillation column.
Answer: See Figure 12.16.
8. Draw the symbols for a furnace and a boiler. Answer: See Figure 12.15.
9. Draw a simple process flow diagram using the symbols from questions 2-8. Answer: See
Figure 12.2.
10. What information is obtained from a loop diagram? Answer: A loop diagram traces all
11. What information is available on electrical one-line diagrams? Answer: Like the piping in
process systems, the wiring in electrical diagrams show a flow path for distributing power
12. What information is contained on a plot plan drawing? Answer: Equipment location
13. Describe the basic components of a block flow diagram. Answer: Block flow diagrams
provide a simplistic set of sequences that move from left to right and show the primary
14. Examine the basic components of a P & ID and explain how it can be used by a
technician to learn how to operate a process unit. Answer: A P & ID is a complex
15. Draw an analytical control loop on a stirred reactor. Answer: See Figure 14.7 Sodium
16. Draw a series of cascaded control loops on a process system. Answer: See Figure 12.31,
17. Sketch a simple process flow diagram of a shell and tube heat exchanger and heat transfer
system. Answer: See Figure 15.36 Preheat System.
18. Sketch a simple process flow diagram of a stirred reactor system; include a pump-around
19. Sketch a simple process flow diagram of a distillation column. Answer: See Figure 12.20
20. Draw a P & ID of a reactor/distillation system. Answer: See Figure 12.20 Process and