Steam Boilers Tech Check 2 Flashcards
Boiler fittings are necessary for
A. safety only
B. efficiency only
C. cosmetic purposes
D, both A and B
D, both A and B
The most important fitting on a boiler is the
A. low water fuel cutoff
B. feedwater regulator
C. superheater
D. safety valve
D. safety valve
To prevent failure from pressure over the MAWP, all steam boilers must be equipped with at least one
A. safety valve
B. blowdown valve
C. gauge glass
D feedwater heater
A. safety valve
A safety valve will
A. control the boiler operating range
B. control high or low water
C. prevent the boiler from exceeding its MAwP
D. control high and low fire
C. prevent the boiler from exceeding its MAwP
Safety valves are designed to
A. open slowly to prevent water hammer
B. pop open.
C. open only by hand.
D. open and then close with no drop in pressure
B. pop open.
Superheater safety valves are set to open
A. after the main safety valves are opened
B. before the main safety valves are opened
C. only when header pressure is 6% above the MAWP
D. when the boiler is coming off-line
B. before the main safety valves are opened
When testing a safety valve by hand, there must be
A. at least 75% of the popping presiure
B. no pressure on the boiler
C. an inspector present
D someone watching the water level
A. at least 75% of the popping presiure
Any repairs to a safety valve should be done by the
A chief engineer
B. state inspector
C. safety valve manufacturer or manufacturer’s authorized representative
D. maintenance department
C. safety valve manufacturer or manufacturer’s authorized representative
The setting or adjusting of a safety valve should only be done by the
A, boiler inspector
B, state inspector
C. person in charge of the shift
D qualified person who is familiar with the construction and operation of a safety valve
D qualified person who is familiar with the construction and operation of a safety valve
If it is necessary to test the relieving capacity of a Bafety valve.
A. an accumulation test is put on the boiler
B. a hydrostatic test is put on the boiler
C, the boiler must be secured and off-line
D. a bench test must be done
A. an accumulation test is put on the boiler
The relieving capacity of a safety valve is measured in
A. British thermal units
B. boiler horsepower
C. Btu per boiler horsepower
D, pounds of steam per hour capable of discharging under a given pressure
D, pounds of steam per hour capable of discharging under a given pressure
The main purpose of a water column is to
A. reduce turbulence in the gauge glass to get a more accurate reading of the water level in the boiler
B, reduce surface tension
C. provide a means of putting an accumulation test on the boiler
D. provide a place to install the boiler gauge glass
A. reduce turbulence in the gauge glass to get a more accurate reading of the water level in the boiler
Try cocks are
A, only found on watertube boilers
B. only found on firetube boilers
C, a secondary means of determining water level in a boiler
D. used to collect boiler water samples
C, a secondary means of determining water level in a boiler
When replacing a broken gauge glass, the water level is checked by
A blowing down the gauge glass
B. blowing down the water column
C.using the try cocks
D. never cheek the water level; secure the boiler during repairs
C.using the try cocks
The water column and gauge glass should usually be blown down
A. once a week.
B, once a shift
C. when the boiler is coming offline
D. never blow down under pressure
B, once a shift
A whistle valve is used to
A. indicate it is 12:00 noon
B. indicate a shift change
C. warn the operator of high or low water
D. warn the operator of a leaking blowdown line
C. warn the operator of high or low water
A steam pressure gauge is calibrated in
A. pounds per cubic inch
B. Btu per pound
C. pounds per temperature increase
D. pounds per square inch
D. pounds per square inch
A siphon protects the steam pressure gauge from
A. boiler pressure
B. high temperature of steam
C. water entering the Bourdon tube
D. air entering the Bourdon tube
B. high temperature of steam
The pressure at the base of a vertical foot of water is———psi
A. 0.433
B. 8.3
C. 14.7
D. 34.5
A. 0.433
The boiler vent is located at the
A. main steam line
B. superheater outlet
C. highest part of the mud drum
D. highest part of the steam side of the boiler
D. highest part of the steam side of the boiler
The boiler vent is open when warming up a boiler until
A. the boiler is cut in on the line
B. there is 2 to 3 psi of steam pressure on the boiler
C. the superheater drain is closed
D. never left open during warm-up
B. there is 2 to 3 psi of steam pressure on the boiler
Steam separators work on the principle of
A potential energy
B, kinetic energy
C trapping steam and letting water through
D. changing the direction of the steam flow
D. changing the direction of the steam flow
The dry pipe is located in the
A. upper part of the steam and water drum
B. superheater outlet header
C. main steam line
D line before the turbine throttle
A. upper part of the steam and water drum
Cyclone separators are used in
A. low to medium pressure boilers
B. boilers equipped with superheaters
C. boiler chimneys
D. boiler breeching
B. boilers equipped with superheaters
Saturated steam is steam at
A. a higher temperature than its corresponding pressure
B. its corresponding temperature and pressure
C. a dry state
D. the superheater outlet
B. its corresponding temperature and pressure
When steam is superheated the
A. pressure is increased along with its temperature
B. volume increases
C. temperature increases with no increase in pressure
D. pressure increases
C. temperature increases with no increase in pressure
Superheater tubes are protected from warping or burning out by
A. a continuous flow of steam
B. circulation of steam and water
C. circulation of hot air
D. circulation of flue gases
A. a continuous flow of steam
Soot should be
A. removed from boiler tubes for better heat transfer
B. left on boiler tubes to protect them from burning out
C. only left on superheater tubes
D. saved to cover lines running outside
A. removed from boiler tubes for better heat transfer
Soot blowers are mainly found on
A. waterwalls
B. watertube boilers
C. fire tube boilers
D. main breeching
B. watertube boilers
Steam impinging on boiler tubes would
A keep tubes exceptionally clean
B, cut through the boiler tubes in a very short period of time
C, have no effect on boiler tubes
D. cause undue thermal shock
B, cut through the boiler tubes in a very short period of time
To ensure that moisture-free steam goes to the soot blower, the steam line to the soot blower must come off the
A main steam line
B, superheater outlet header
C, highest part of the steam side of the drum
D, waterwall outlet
C, highest part of the steam side of the drum
Boilers in battery equipped with manhole openings must have according to the ASME code.
A. two main steam stop valves
B, one main steam stop valve
C, no valves between boiler and header
D. boilers in battery have no manhole openings
A. two main steam stop valves
Main boiler stop valves must be valves.
A, os&y gate
B. os&ty globe
C. quick-closing lever type
D, plug-type
A, os&y gate
The ASME code will allow an automatic nonreturn valve to be used as a main steam stop valve. If one is used it must be
A, located between the main stop and main header
B. installed as close to the shell of the boiler as practical on the main steam line
C. used only on low pressure boilers
D, none of the above
B. installed as close to the shell of the boiler as practical on the main steam line
The main steam stop valves should be gate valves because they
A, can restrict the flow of steam
B. can be used as throttling valves
C. do not have to be fully open
D offer no restriction to the flow of steam
D offer no restriction to the flow of steam
When the boiler is equipped with hand-operated, main steam stop valves, to cut the boiler in on the line, the steam pressure on the incoming boiler should be
A. slightly higher than line pressure
B, equal to line pressure
C, slightly lower than line pressure
D makes no difference: pressure will equalize
C, slightly lower than line pressure
When a boiler is being inspected, the two main steam stop valves are
A. left wide open
B, closed, locked, and tagged
C. left as the operator prefers
D. none of the above
B, closed, locked, and tagged
During boiler warm-up, to remove any condensate trapped between the two boiler stop valves the
A free-blowing drain should be open
B. superheater drain should be open
C. boiler vent should be open
D equalizing line should be closed
A free-blowing drain should be open
During normal usage, the main boiler steam line expands and contracts To allow for this
A. rigid pipe hangers are used
B, expansion bends are used
C. the main steam line must be welded to external braces
D. nothing has to be done; this will take care of itself
B, expansion bends are used
According to the ASME code, boilers operating at 100 psi or over must have
A. no bottom blowdown valves
B. only one bottom blowdown valve
C. two bottom blowdown valves
D. up to manufacturer of boiler
C. two bottom blowdown valves
When blowing down a boiler equipped with a quick-opening valve and a screw-type valve, the quick-opening valve is
A, opened first and closed last
B. opened last and closed first
C. opened first and elosed first
D. opened as operator prefers
A, opened first and closed last
If a quick-opening valve is used as a bottom blowdown valve, it must be located
A. between the boiler and the slow opening (screw-type) valve
B. furthest from the shell of the boiler
C. cannot be used on high pressure boilers
D. none of the above
A. between the boiler and the slow opening (screw-type) valve
The maximum size of the bottom blowdown line and the surface blowdown line is
A. 1 1/2
B. 2 1/2
C. 3
D. no maximum size required
B. 2 1/2
Bottom blowdown lines on a watertube boiler are located on the
A. mud drum
B. bottom of the steam and water drum
C. superheater outlet header
D lowest part of the combustion chamber
A. mud drum
The most accurate means of deciding the frequency of blowdown of a boiler is determined by a
A. flue gas analysis
B. boiler operator
C. boiler water analysis
D. the feedwater chemical sales representative
C. boiler water analysis
Surface tension on the water in the steam and water drum is increased
A. impurities that float on the surface of the water
B. inexperienced boiler operators
C. very soft water
D. a high steam load.
A. impurities that float on the surface of the water
To protect sewer lines from the high temperature and high pressure coming from the boiler blowdown lines,
A. traps are used
B. blowdown tanks are used
C. steam separators are used
D nothing has to be used. They can handle all temperatures and pressures
B. blowdown tanks are used
