Chapter 19 Introduction to Thermoil Heaters & Systems

Question 1

1. A _____ inspection of the hot oil heater tubes will confirm the presence or absence of a coke deposits.

A. Radiographic

B. Dye penetrant

C. Magnetic flux

D. Visual

E. Ultrasound

Answer 1

A. Radiographic

Question 2

2. The refractory brick of the hot oil heater should be inspected for:

A. Consistency

B. Abnormal cracks

C. Hardness

D. Colour

E. Density

Answer 2

B. Abnormal cracks

Question 3

3. Radiant type oil heaters for a hot oil system have:

A. Efficiencies of about 40 to 50%

B. Combustion gases flowing inside tubes

C. Tubes containing fins on their inner surfaces

D. Mechanical draft combustion systems

E. An efficiency of about 75 to 85%

Answer 3

A. Efficiencies of about 40 to 50%

Question 4

4. Hot oil circulating pumps:

A. Are positive displacement units

B. Must be capable of temperatures above 500°C (932°F)

C. Are usually single stage centrifugal units

D. Need not be kept hot if on standby

E. Lobe type pumps

Answer 4

C. Are usually single stage centrifugal units

Question 5

5. The hot oil heater is strengthened and supported by structural support beams mounted on:

A. Reinforced concrete piers

B. Steel piles

C. Concrete piles

D. Steel skids

E. Reinforced concrete walls

Answer 5

A. Reinforced concrete piers

Question 6

6. Clean steam may be used in:

A. Gas plants

B. Oil Refineries

C. Direct heating by steam injection

D. Steam cleaning

E. Chemical processes

Answer 6

C. Direct heating by steam injection

Question 7

7. Clean steam may be used in:

A. Gas plants

B. Vacuum forming systems

C. Oil Refineries

D. Steam cleaning

E. Chemical processes

Answer 7

B. Vacuum forming systems

Question 8

8. Clean steam may be used in:

A. Sterilization systems

B. Gas plants

C. Oil Refineries

D. Steam cleaning

E. Chemical processes

Answer 8

A. Sterilization systems

Question 9

9. The major components of a typical hot oil system include the furnace, pump, control devices and the:

A. Relief valve

B. Gas blanket

C. Surge tank

D. Stack damper

E. Containment dyke

Answer 9

C. Surge tank

Question 10

10. Oils intended for use as heat transfer fluid in a hot oil system should:

A. Possess low heat transfer characteristics

B. Resist thermal breakdown at low operating temperatures

C. Have a low vapour pressure at operating temperature

D. Have a high viscosity

E. Be corrosive to metals used in the system

Answer 10

C. Have a low vapour pressure at operating temperature

Question 11

11. Oils intended for use as heat transfer fluid in a hot oil system should:

A. Possess high heat transfer characteristics

B. Resist thermal breakdown at low operating temperatures

C. Have a high vapour pressure at operating temperature

D. Have a high viscosity

E. Be corrosive to metals used in the system

Answer 11

A. Possess high heat transfer characteristics

Question 12

12. Oils intended for use as heat transfer fluid in a hot oil system should:

A. Possess low heat transfer characteristics

B. Resist thermal breakdown at low operating temperatures

C. Have a high vapour pressure at operating temperature

D. Have a high viscosity

E. Be non-corrosive to metals used in the system

Answer 12

E. Be ‘‘non-corrosive to metals’’ used in the system

Question 13

13. While the hot oil heater refractory is being dried out the oil circulating in the tubes should be limited to a temperature rise of not more than \_\_\_\_\_ per hour.
A.	60°C
B.	55°C
C.	35°C
D.	30°C
E.	25°C

Answer 13

B. 55°C

Question 14

14. When shutting down a hot oil system, the oil is circulated in order to prevent:

A. Uneven cooling of the oil

B. Oil viscosity becoming too low

C. Hot spots from forming

D. Over-pressurization of the heater

E. The oil from vaporizing

Answer 14

C. Hot spots from forming

Question 15

15. Depending upon the size of the hot oil heater, it may have anywhere from 2 to _____ burners.

A. 20

B. 10

C. 30

D. 25

E. 15

Answer 15

A. 20 BURNERS

Question 16

16. A hot oil system is one that uses a _____ to conduct heat from a central source to other vessels and heating coils in a plant.

A. Thermal fluid

B. Steam

C. Hot water

D. Liquid salt

E. Hot air

Answer 16

A. Thermal fluid

Question 17

17. The type of hot oil system heater which is most efficient is the:

A. Radiant

B. Convection

C. Combined radiation and convection

D. Combined conduction and convection

E. Combined conduction and radiation

Answer 17

C. Combined radiation and convection

Question 18

18. During the annual inspection the hot oil heater tubes should be checked for signs of:

A. Caustic embrittlement

B. Oxygen pitting

C. Scale buildup

D. Gouging

E. Internal deposits

Answer 18

E. Internal deposits

Question 19

19. The ‘‘gas burners of hot oil’’ hearers are mounted:

A. On the front of the furnace

B. External to the furnace

C. On the roof of the furnace

D. On the floor of the furnace

E. On the walls of the furnace

Answer 19

D. On ‘‘the floor’’ of the furnace

Question 20

20. With reference to hot oil systems the acronym AFV stands for:

A. After flow valve

B. Accelerated fuel valve

C. Automatic flow valve

D. Automatic fuel valve

E. After fuel valve

Answer 20

D. Automatic fuel valve