Chapter 19 Introduction to Thermoil Heaters & Systems Flashcards
- 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
A. Radiographic
- The refractory brick of the hot oil heater should be inspected for:
A. Consistency
B. Abnormal cracks
C. Hardness
D. Colour
E. Density
B. Abnormal cracks
- 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%
A. Efficiencies of about 40 to 50%
- 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
C. Are usually single stage centrifugal units
- 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
A. Reinforced concrete piers
- Clean steam may be used in:
A. Gas plants
B. Oil Refineries
C. Direct heating by steam injection
D. Steam cleaning
E. Chemical processes
C. Direct heating by steam injection
- Clean steam may be used in:
A. Gas plants
B. Vacuum forming systems
C. Oil Refineries
D. Steam cleaning
E. Chemical processes
B. Vacuum forming systems
- Clean steam may be used in:
A. Sterilization systems
B. Gas plants
C. Oil Refineries
D. Steam cleaning
E. Chemical processes
A. Sterilization systems
- 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
C. Surge tank
- 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
C. Have a low vapour pressure at operating temperature
- 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
A. Possess high heat transfer characteristics
- 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
E. Be ‘‘non-corrosive to metals’’ used in the system
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
B. 55°C
- 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
C. Hot spots from forming
- 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
A. 20 BURNERS
- 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
A. Thermal fluid
- 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
C. Combined radiation and convection
- 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
E. Internal deposits
- 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
D. On ‘‘the floor’’ of the furnace
- 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
D. Automatic fuel valve
