One boiler horsepower
The evaporation of 34.5 lb of water/hr from and at a feedwater temperature of 212°F
a firetube boiler
Because of the large volume of water, the boiler most likely to cause a boiler explosion is ___.
a boiler explosion
A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result in ___.
The part of a boiler that has the heat and gases of combustion on one side and water on the other side is known as the ___.
The comparison, or ratio, of heat supplied in fuel to heat absorbed by water is defined as ___ efficiency.
boiler heating surface
Baffles are designed to direct the gases of combustion so that they come into close contact with the ___.
The steam and water drum of watertube boilers is dished (concave) to eliminate the need for ___.
To increase the life of a furnace refractory, some watertube boilers are equipped with ___.
American Society of Mechanical Engineers (ASME)
Safety valve connections must be approved by the ___.
To prevent failure from pressure over the MAWP, all steam boilers must be equipped with at least one ___.
safety valve manufacturer or manufacturer's authorized representative
Any repairs to a safety valve should be done by the ___.
qualified person who is familiar with the contruction and operation of a safety valve
The setting or adjusting of a safety valve should only be done by the ___.
an accumulation test is put on the boiler
If it is necessary to test the relieving capacity of a safety valve, ___.
pounds of steam per hour capable of discharging under a given pressure
The relieving capacity of a safety valve is measured in ___.
reduce turbulence in the gauge glass to get a more accurate reading of the water level in the boiler
The main purpose of a water column is to ___.
there is 10 to 15 psi of steam pressure on the boiler
The boiler vent is open when warming up a boiler until ___.
cut through the boiler tubes in a very short period of time
Steam impinging on boiler tubes would ___.
highest part of the steam side of the drum
To ensure that moisture-free steam goes to the soot blower, the steam line to the soot blower must come off the ___
two main steam stop valves
Boilers in battery equipped with manhole openings must have ___ according to the ASME code.
installed as close to the shell of the boiler as practical on the main steam line
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 ___.
offer no restriction to the flow of steam
The main steam stop valves should be gate valves because they ___.
slightly lower than line pressure
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 ___.
closed, locked, and tagged.
When a boiler is being inspected, the two main steam stop valves are ___.
free-blowing drain should be open
During boiler warm-up, to remove any condensate trapped between the two boiler stop valves the ___.
expansion bends are used
During normal usage, the boiler main steam line expands and contracts. To allow for this ___.
two bottom blowdown valves
According to the ASME code, boilers operating at 100 psi or over must have ___.
opened first and closed last
When blowing down a boiler equipped with a quick-opening valve and a screw-type valve, the quick-opening valve is ___.
between the boiler and the slow-opening (screw-type) valve
If a quick-opening valve is used as a bottom blowdown valve, it must be located ___.
boiler water analysis
The most accurate means of deciding the frequency of blowdown of a boiler is determined by a ___.
impurities that float on the surface of the water
Surface tension on the water in the steam and water drum is increased by ___.
blowdown tanks are used
To protect sewer lines from the high temperature and high pressure coming from the boiler blowdown lines, ___.
in the open deaerator feedwater heater
Oxygen and other noncondensable gases are separated form the feedwater ___.
be used for process work and heating
Steam is extracted from the turbine after it has passed through some of the turbine stages to ___
passed through tubes to cause steam to condense, causing a vacuum
A surface condenser has water ___.
On the feedwater line near the boiler is a check valve and a stop valve. The valve closest to the shell of the boiler is the ___ valve.
volume of air passing through the venturi tube
On a boiler burning low pressure gas, the volume (amount) of gas burned is controlled by the ___.
allow one strainer to be cleaned without securing the boiler
On the fuel oil system, the purpose of the duplex strainers on the suction line between the tank and fuel oil pump is to ___.
can come in closer contact with the oxygen for complete combustion
Pulverized coal has the consistency of talcum powder so that it ___.
difference in temperature of a column of gas inside the chimney from a column of air outside the chimney
Natural draft is produced by a(n) ___.
maintain a water level in the feedwater heater if there are insufficient condensate returns
The automatic city water makeup valve found on an open feedwater heater is used to ___.
diameter of steam piston, diameter of water piston, and length of pump stroke
The sequence of three numbers found on the data plate attached to a reciprocating feedwater pump indicates the ___.
A(n) ___ draft fan must be used to overcome resistance caused by gases of combustion leaving the boiler when an economizer is used.
pump and the discharge valve
A reciprocating feedwater pump must have a safety relief valve located between the ___.
is converted into pressure
The theory of operation of a centrifugal pump is that the centrifugal force of a rotating element ___.
positive displacement pump
A turbine feedwater pump differs from a centrifugal feedwater pump in that it is a ___.
safety relief valve must be installed on the discharge line
To protect the turbine pump from excessive pressure, a(n) ___.
check valve can be repaired without taking the boiler off-line
The feedwater stop valve on the feedwater line is located closest to the shell of the boiler so that the ___.
the feedwater pump to become steambound
Water temperature that is too high in the open feedwater heater could cause ___.
oxygen pitting in the boiler
Water temperature that is too low in the open feedwater heater could cause ___.
when both superheated and saturated steam are needed, with a pressure-reducing station, and with feedwater addition to desuperheat the steam
A line desuperheater is typically used ___.
pressure buildup, which would cause an oil spill
A clogged vent line on a fuel oil tank being filled with fuel oil could result in a ___.
signs of sludge and water are evident in the tank
A high suction line on a fuel oil tank is used when ___.
circulate fuel oil during warm-up, return fuel oil that bypasses the burner, and return fuel oil from the relief valve
The purpose of the fuel oil return line is to ___.
manual reset valve
In a low pressure gas burner, a ___ shuts off the gas supply if a low water condition exists.
on the discharge side of
Fuel oil heaters must be protected from excessive fuel oil pressure because they are located ___ the fuel pumps.
rotating, high pressure oil coming out of the plug or sprayer plate
In a pressure atomizing burner, atomization is accomplished by ___.
as an automatic gas shutoff valve
A solenoid valve is a direct-acting valve in the gas system and is used ___.
air damper, butterfly valve, and modulating motor and linkage
The air-to-gas ratio is maintained by a(n) ___.
The amount of gas drawn into the air stream in a low pressure gas system is controlled by the ___.
under and over the fuel bed
To achieve complete combustion in a spreader stoker, air is introduced ___.
The volume of gas to the burner in a high pressure gas system is controlled by a ___ valve.
atmosphere; inside the boiler setting
Draft in the boiler is measured between two points such as the ___ and ___.
economizers and air heaters
To reduce the heat loss of flue gases going to the chimney, boilers are equipped with ___.
move up while the air goes down
The convection air heater employs a counterflow principle in which the gases of combustion ___.
condensation on the gas side of the air heater
If the temperature of air entering the heater gets too low, it will cause ___.
a loss of air for combustion and lower boiler efficiency
If air supplied for combustion mixes with gases of combustion, it could lead to ___.
height of the chimney
The amount of draft available in a natural draft system is dependent on the ___.
The gases of combustion leaving a boiler that has natural draft are controlled by ___.
both forced and induced draft fans
Larger steam boilers that are equipped with air heaters and/or economizers must use ___.
The temperature at which fuel oil will give off a vapor that will ignite readily when exposed to an open flame is its ___ point.
ultimate analysis is used
In order to determine the heating value of coal in Btu per pound, the ___.
The temperature at which fuel oil will give off a vapor that burns continuously is its ___ point.
moisture content, content of volatile matter, and fixed carbon and ash content
A proximate analysis of coal provides information regarding its ___.
___ coal is the type of coal most likely to have problems with spontaneous combustion when being stockpiled.
Air supplied to the burner that is more than the theoretical amount needed to burn fuel is ___ air.
___ combustion is when all fuel is burned using only the theoretical amount of air supplied.
formation of soot and smoke
Gases of combustion that cool on contact with the boiler heating surface before combustion is completed cause a(n) ___.
Air needed for the combustion of fuel is made up of approximately ___% oxygen and ___% nitrogen.
carbon dioxide, carbon monoxide, and oxygen
The Orsat gas analyzer measures the percentage of ___ in the flue gas.
start and stop the burner on steam pressure demand
The purpose of the boiler pressure control found in the ON/OFF control system is to ___
highest part of the steam side of the boiler
the ON/OFF pressure control must be connected to the ___.
in a vertical position
A mercury-tube pressure control will only be accurate when it is installed ___.
fuel supply; air supply; ratio of air to fuel; removal of combustion gases
The four elements that must be regulated in a combustion control system are ___.
set the operating steam pressure range of the boiler
The two scales found on the boiler pressure control are used to ___.
regulate the high and low firing rates of the burner
The purpose of the boiler modulating pressure control is to ___.
highest part of the steam side of the boiler
The modulating pressure control must be connected to the ___.
The blower motor control continues to operate after fuel is shut off the burner during ___.
a prepurge period
To eliminate the danger of a furnace explosion during startup, the firing sequence must first allow for ___.
both the pilot and the main flame
The scanner must be installed on the front of the boiler to sight ___.
secure the fuel, purge the firebox, and then shut down
In the event of a flame failure, the programmer will ___.
The positioning combustion control system used on older boilers cannot function without ___ pressure.
highest part of the steam side
The boiler steam-pressure gauge must be connected to the ___of the boiler.
to take and read the readings for remote plants centrally
A primary reason for using thermocouples for measuring temperatures is ___.
superheated steam, gases of combustion, and condensate return
A ___ reading can be read using a thermocouple.
venturi, orifice plate, and flow nozzle
The differential-pressure flow meter functions by receiving a difference of pressure across a(n) ___.
the boiler operator cannot always see the chimney to observe smoking conditions
Smoke indicators are often essential because ___.
heating the feedwater and using sodium sulfite
Oxygen present in the boiler water is removed by ___.
daily testing of boiler water
The frequency of blowing down a steam boiler is best ascertained by the ___.
cold lime-soda, hot lime-soda, and ion exchange
External feedwater treatment conditions the feedwater before it enters the boiler and can be a(n) ___ process.
the water level on all boilers that are on the line by blowing down the water column and gauge glass
When taking over a shift, the boiler operator must first check ___.
test the low water fuel cutoff control, inspect and check running auxiliaries for proper lubrication, and check the burner and the fire for correct flame, including the fuel temperature and pressure
The duties of a boiler operator taking over a shift are to ___.
by blowing down the low water fuel cutoff or allowing the water level in the boiler to drop
The low water fuel cutoff control can be tested ___.
hourly readings of all pertinent steam plant data
The operator in charge of a shift must maintain a boiler room log that indicates ___.
check for the correct boiler water level
Regardless of the type of fuel being used, before lighting off a boiler during a cold start-up, the operator must first ___.
a possible furnace explosion
The purpose of a flame failure control is to protect the boiler from ___.
purging the furnace
After establishing the proper boiler water level, the burner may be lit after ___.
warmed up slowly
In order to prevent uneven expansion of the boiler on a cold startup, the boiler must be ___.
During startup, the boiler vent should remain open until a pressure of approximately ___ psi is on the boiler.
75% to 85% of the line pressure
The automatic nonreturn valve on a boiler being cut in on a line should be opened when the steam pressure on the boiler reaches ___.
before the boiler is cut in on the line
It is good operating procedure to test the safety valve on an incoming boiler by hand ___.
closed as soon as
The free-blowing drain between the boiler's automatic nonreturn valve and the main steam stop valve should be ___ the boiler is cut in on the line.
slightly lower than
When cutting a boiler in on a line equipped with two hand-operated steam stop valves, the pressure on the boiler should be ___ line pressure.
keeping the superheater drain valve open until the boiler is cut in on the line
Boilers equipped with a superheater must be protected during warmup by ___.
When the steam pressure in the boiler has dropped to 10 psi or 15 psi, the ___ should be opened.
cleaned on both the fire and water sides
To prepare a boiler for inspection, the boiler must be ___.
a hydrostatic test
After a boiler has had major repair work made on its steam or water side or has developed a low water condition, it should be subjected to ___.
layed up either wet or dry
Boilers that are out of service for an extended period of time can be ___.
warns the operator of high or low water
The whistle valve, which is located in the boiler water column, ___.
thoroughly examined for signs of overheating
A boiler that has experienced a low water condition should be ___.
either a flame failure or a low water condition
If a boiler that was on-line is down because of low steam pressure, the cause is ___.
1 ½ times the safety valve setting
When performing a hydrostatic test, the pressure on the boiler should be increased to ___.
confined space permit
Maintenance work performed inside a boiler requires a(n) ___ that contains procedures to prevent possible injury from hazards.
the immediate superior
When someone finds an unsafe condition in a plant, that person should report it to ___.
extend the life of the equipment, increase overall plant efficiency, and reduce downtime
Preventive maintenance of boiler room equipment can ___.
protect workers and equipment
The primary purpose of establishing a set of plant safety rules is to ___.