chapter 19 Flashcards
a hot oil heating system is similar in principal to
a. a hot water heating system
b. an oil refinery
c. a condensate return system
d. a firetube boler burner
a
radiant type oil heaters for a hot oil system have
a. an efficiency of about 75-85%
b. combustion gases flowing across tubes
c. tubes containing fins on their outer surface
d. efficiencies of about 45%
d
hot oil may coke in the heater tubes if
a. stack temp gets too high
b. oil temp exceeds 350c
c. a tube should develop a leak
d. furnace temp drops too low
b
hot oil circulating pumps
a. are positive displacment units
b. are usually single stage centrifugal units
c. must be capable of temps above 500c
d. need not be kept hot if on standby
b
the type of hot oil system heater which is most effiecient is the
a. radiant
b. convection
c. combined conduction and convection
d. combined radiation and convection
d
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 low
c. over-pressurization of the heater
d. hot spots from forming
d
Hot oil circulating pumps:
A.Are positive displacement units
B.Are usually single stage centrifugal units
C.Must be capable of temperatures above 500°C (932°F)
D.Need not be kept hot if on standby
E.Lobe type pumps
b
The gas burners of hot oil heaters are mounted:
A.On the front of the furnace
B.On the floor of the furnace
C.On the walls of the furnace
D.On the roof of the furnace
E.External to the furnace
b
A hot oil heating system is similar in principle to:
A.A steam heating system
B.A condensate return system
C.A firetube boiler burner
D.An oil refinery
E.A hot water heating system
e
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.Flame impingement
E.Gouging
d
Clean steam may be used in:
A.Steam cleaning
B.Direct heating by steam injection
C.Chemical processes
D.Gas plants
E.Oil Refineries
b
HRSG is the acronym for:
A.Heavy Radiation Steam Grader
B.Heat Recovery Steam Generator
C.Hot Recovery System Generator
D.High Recovery System Grader
E.Hot Radiation Steam Generator
b
With reference to hot oil systems the acronym AFV stands for:
A.Accelerated fuel valve
B.After fuel valve
C.Automatic flow valve
D.After flow valve
E.Automatic fuel valve
e
Oils intended for use as heat transfer fluid in a hot oil system should:
A.Resist thermal breakdown at low operating temperatures
B.Have a high viscosity
C.Be corrosive to metals used in the system
D.Possess high heat transfer characteristics
E.Have a high vapour pressure at operating temperature
d
When shutting down a hot oil system, the oil is circulated in order to prevent:
A.Uneven cooling of the oil
B.Hot spots from forming
C.Over-pressurization of the heater
D.Oil viscosity becoming too low
E.The oil from vaporizing
b
