Steam Boilers Module 15 Sessions 3 and 4 Flashcards
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
C. Only when header pressure is 6% above the MAWP
When testing a safety valve by hand, there must be \_\_\_\_\_\_\_\_\_\_\_\_\_\_. A. At least 75% of the popping pressure B. No pressure on the boiler C. An inspector present D. Someone watching the water level
A. At least 75% of the popping pressure
Any repairs to a safety valve should be done by the _____________.
A. Chief engineer
B. State inspector
C. Manufacturer’s authorized representative
D. Maintenance department
C. 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 safety 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. Found on watertube boilers A 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 check 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 per week B. Once per shift C. When the boiler is coming off-line D. Never blow down under pressure
B. Once per 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. O.433 B. 8.3 C. 14.7 D. 34.5
A. O.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. An operator manually closes it
D. An operator manually closes it
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. Continuous 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. Firetube 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 steamline 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&Y globe C. Quick-closing lever-type D. Plug-type
A. OS&Y gate
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
During boiler warm-up, to remove any condensate trapped between the two boiler stop valves, the \_\_\_\_\_\_\_\_\_\_\_\_ should be open. A. Free-blowing drain B. Superheater drain C. Boiler vent D. Equalizing line
A. Free-blowing drain
The three major causes of a low water condition in a boiler are: carelessness or inattention, over firing of a boiler, and \_\_\_\_\_\_\_\_\_\_\_\_. A. Defects in a system B. Poor maintenance C. Buying poor quality boilers D. Inexperienced workers
A. Defects in a system
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 closed first
D. Opened as operator prefers
A. Opened first and closed last
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 water tube 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
B. Bottom of the steam and water 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 by ____________.
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
