Firetube Boilers Flashcards
HRT boiler firetubes have a diameter range of
a) 25 to 51 mm
b) 51 to 102 mm
c) 76 to 102 mm
d) 102 to 137 mm
e) 125 to 176 mm
c) 76 to 102 mm
A device used to prevent the carry-over of moisture with the steam of an HRT boiler is the a) internal pipe b) dry pipe c) nozzle d) head pipe e) crown tube
b) dry pipe
With regard to a steam boiler, the lettering “HRT” means
a) highly regulated temperature
b) hot return tubes
c) horizontal return tubular
d) highly regulated treatment
e) horizontal receiver tubes
c) horizontal return tubular
An advantage of a locomotive boiler over other boilers of the era was a) rugged construction b) better cleaning and repair access c) improved water circulation d) less stays were required e) lower maintenance costs
a) rugged construction
A component used to increase the volume of the steam space in a locomotive boiler was the a) crown sheet b) steam leg c) shell head d) dry pipe e) steam dome
e) steam dome
A boiler which utilized a waterleg and was primarily used for heating purposes was the a) HRT boiler b) locomotive boiler c) firebox boiler d) Scotch boiler e) marine boiler
c) firebox boiler
A major disadvantage of a firebox is
a) first cost is relatively high
b) it has a low heat transfer efficiency
c) it is not very compact
d) cleaning and inspection can be difficult
e) it has only one flue gas pass
d) cleaning and inspection can be difficult
The firebox boiler is a \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ pass firetube boiler. a) single b) two c) three d) vertical e) horizontal
b) two
A corrugated furnace will give required strength with thinner
metal, increase heating surface, and
a) increase the boiler mass
b) add to the overall material cost of the unit
c) decrease combustion turbulence
d) will necessitate the boiler being made longer
e) allow for differential expansion and contraction
e) allow for differential expansion and contraction
The wetback Scotch boiler was designed primarily for
a) building heating service
b) marine service
c) traction engine service
d) railway service
e) very high capacity electrical generation
b) marine service
In a packaged firetube boiler the flue gas velocity within the unit is maintained by a) increasing forced draft fan speed b) constructing a taller stack c) varying the firetube lengths d) varying the total cross-sectional area of the fire tubes in each pass e) decreasing forced draft fan speed
d) varying the total cross-sectional area of the fire tubes
in each pass
A boiler which is built ready for installation is the
a) Scotch marine boiler
b) firebox boiler
c) HRT boiler
d) packaged boiler
e) locomotive boiler
d) packaged boiler
A firetube boiler is one which has
a) water on the inside of the tubes and the hot gas of combustion
on the outside.
b) the furnace as the first pass of the burner flame.
c) water on the outside of the tubes and hot water on the inside
of the tubes.
d) water on the outside of the tubes and the hot gas on the inside
of the tubes.
e) internally fired tubes surrounded by water
d) water on the outside of the tubes and the hot gas on the inside
of the tubes.
When the hot combustion gases travel through boiler tubes which
are surrounded by the boiler water, the boiler is called a
a) watertube boiler
b) tubular boiler
c) packaged boiler
d) coil type boiler
e) firetube boiler
e) firetube boiler
The advantages of a packaged boiler are:
1. lower freight costs because of less handling
2. lower initial cost because they are mass produced
3. quality control is easier to implement
4. the boilers can be factory tested before being sent
to the customer
5. it requires little time to put the unit into operation
at the plant site
a) 1, 3
b) 2, 5
c) 2, 3, 4
d) 1, 2, 3, 4, 5
e) 2, 3, 4, 5
Watertube
d) 1, 2, 3, 4, 5
