CHAPTER 19 Flashcards
(30 cards)
When shutting down a hot oil system, the oil is circulated in order to prevent:
Select one:
A.
Uneven cooling of the oil
B.
Over-pressurization of the heater
C.
The oil from vaporizing
D.
Hot spots from forming
E.
Oil viscosity becoming too low
D.
Hot spots from forming
During the annual inspection the hot oil heater tubes should be checked for signs of:
Select one:
A.
Gouging
B.
Scale buildup
C.
Caustic embrittlement
D.
Oxygen pitting
E.
Internal deposits
E.
Internal deposits
Larger diameter piping (above 25.4 mm or 1 in) may be _____ pipe.
Select one:
A.
Schedule 80
B.
Double extra strong
C.
Schedule 1600
D.
Schedule 40
E.
Strong
D.
Schedule 40
Oils intended for use as heat transfer fluid in a hot oil system should:
Select one:
A.
Be corrosive to metals used in the system
B.
Have a high vapour pressure at operating temperature
C.
Possess low heat transfer characteristics
D.
Resist thermal breakdown at normal operating temperatures
E.
Have a high viscosity
D.
Resist thermal breakdown at normal operating temperatures
Hot oil may coke in the heater tubes if:
Select one:
A.
Furnace temperature drops too low
B.
Oil flow rate is too high
C.
Stack temperature gets too high
D.
Oil temperature exceeds 350°C (662°F)
E.
A tube should develop a leak
D.
Oil temperature exceeds 350°C (662°F)
The oil temperature is controlled by the:
Select one:
A.
Temperature required by the process
B.
Process requirements
C.
Pressure required by the process
D.
Firing rate in the furnace
E.
Volume of material produced
D.
Firing rate in the furnace
During the annual inspection the hot oil heater tubes should be checked for signs of:
Select one:
A.
Scale buildup
B.
Gouging
C.
Oxygen pitting
D.
Flame impingement
E.
Caustic embrittlement
D.
Flame impingement
The inner walls and floor are lined with:
Select one:
A.
Insulation
B.
Refractory brick
C.
Plain tubes
D.
Steel sheets
E.
Finned tubes
B.
Refractory brick
On the fuel gas system to a hot oil heater, the acronym, PRV, stands for:
Select one:
A.
Pressure regulating valve
B.
Primary relief valve
C.
Primary regulating valve
D.
Pressure restricting valve
E.
Pressure relief valve
A.
Pressure regulating valve
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.
Select one:
A.
30°C
B.
60°C
C.
55°C
D.
35°C
E.
25°C
C.
55°C
Oils intended for use as heat transfer fluid in a hot oil system should:
Select one:
A.
Have a high vapour pressure at operating temperature
B.
Have a high viscosity
C.
Be corrosive to metals used in the system
D.
Resist thermal breakdown at low operating temperatures
E.
Possess high heat transfer characteristics
E.
Possess high heat transfer characteristics
The type of hot oil system heater which is most efficient is the:
Select one:
A.
Combined radiation and convection
B.
Combined conduction and radiation
C.
Radiant
D.
Combined conduction and convection
E.
Convection
A.
Combined radiation and convection
Clean steam may be used in:
Select one:
A.
Chemical processes
B.
Sterilization systems
C.
Gas plants
D.
Oil Refineries
E.
Steam cleaning
B.
Sterilization systems
One of the weaknesses of the gas turbine is its:
Select one:
A.
Weight to power ratio
B.
Startup time
C.
Reciprocating motion
D.
Heavy weight
E.
Thermal efficiency
E.
Thermal efficiency
With reference to hot oil systems the acronym AFV stands for:
Select one:
A.
Accelerated fuel valve
B.
After fuel valve
C.
Automatic fuel valve
D.
After flow valve
E.
Automatic flow valve
C.
Automatic fuel valve
A hot oil heating system is similar in principle to:
Select one:
A.
A firetube boiler burner
B.
A hot water heating system
C.
A condensate return system
D.
A steam heating system
E.
An oil refinery
B.
A hot water heating system
Depending upon the size of the hot oil heater, it may have anywhere from 2 to _____ burners.
Select one:
A.
20
B.
10
C.
30
D.
15
E.
25
A.
20
Clean steam may be used in:
Select one:
A.
Gas plants
B.
Steam cleaning
C.
Chemical processes
D.
Oil Refineries
E.
Humidification systems
E.
Humidification systems
Clean steam is steam that is generated from _____ as its feed water.
Select one:
A.
Water corrosion control chemicals
B.
Water containing oxygen scavengers
C.
Condensate
D.
Water anti-scaling compounds
E.
De-ionized or distilled water
E.
De-ionized or distilled water
The refractory brick of the hot oil heater should be inspected for:
Select one:
A.
Density
B.
Consistency
C.
Abnormal cracks
D.
Hardness
E.
Colour
C.
Abnormal cracks
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.
Select one:
A.
Steam
B.
Hot water
C.
Thermal fluid
D.
Liquid salt
E.
Hot air
C.
Thermal fluid
_____ extinguishing agents should be used to extinguish burning hot oil.
Select one:
A.
Foam or dry chemical
B.
Carbon dioxide
C.
Dry powder
D.
Water based
E.
Halogen
A.
Foam or dry chemical
Clean steam may be used in:
Select one:
A.
Vacuum forming systems
B.
Oil Refineries
C.
Chemical processes
D.
Steam cleaning
E.
Gas plants
A.
Vacuum forming systems
Radiant type oil heaters for a hot oil system have:
Select one:
A.
Efficiencies of about 40 to 50%
B.
Mechanical draft combustion systems
C.
An efficiency of about 75 to 85%
D.
Tubes containing fins on their inner surfaces
E.
Combustion gases flowing inside tubes
A.
Efficiencies of about 40 to 50%
