Answer key Flashcards
The number of blowdowns is determined by______
Feed water analysis
A_____pump is a boiler accessory that draws condensate back from the system by produsing a negative pressure
Vacuum pump
Oxygen in the water causes_____?
Pitting
A therm is equivalent to_____BTU
100,000
A_____draft fan is located before the furnace
Forced
Impurities that increase the surface tension of boiler water are remove with a_____blowdown
Surface
The primary function of the water column on a low pressure boiler is to______
Reduce water movement
The boiler vent is opened when_____
Adding feedwater chemicals and warming the boiler
A low water condition requires_____immediately
Securing fuel to the burner
CO in the flue gas is an indication of_____combustion
Incomplete
Oxigen is required for the combustion of fuel
True
A siphon is located between the boiler and steam pressure gauge to prevent water from entering the bourdon tube
False
At the NOWL the gauge glass is approximately half full
True
A low water condition in the boiler can cause overheating of the tubes
True
City water does not require treatment for use in a boiler
False
Steam traps prevent the flow of condensate back to the feedwater pump
False
Clogged fuel oil strainers cause high suction reading
True
Anthtacity coal is hard coal
True
Draft is measure with a manometer
True
Sludge is removed from the boiler with a surface blowdown
False
A deaerator is a boiler water treatment accessory that heats feedwater to the temperature of saturated steam withing the pressure vessel
True
All valves are close when completing a dry lay-up
True
The boiler room log is used to record boiler operation events
True
Forced circulation hot water heating systems are more common in large buildings than natural circulation hat water heating systems
True
The pressure reading valve in hot water heating system regulates the water pressure of water returning from heating units
False
A boiler is an open vessel in which water is transformed into steam under pressure by the application of heat
False
An HRT boiler is a watertube boiler
False
In a watertube boiler the_____pass through the tubes and the____passs across the outside surface of the tubes
Water
Combustion gases
The three most common fuels used in steam production are_____
Natural gas, fuel oil, and coal
In a natural draft furnace the amount of draft, is effected by the heigh of the stack
True
Fuel oil grades commonly used in boiler are designated by No._____for the lightes grade and No._____for the heaviest grade of fuel oil.
2 and 6 fuel oil
A boiler has quick and slow opening blowdown valves, the sequence used for blowdown is______
Open quick valve, open slow valve
Close slow valve, close quick valve
The most important boiler fitting in a boiler_____
Safety valve
The valve with the least amount of restriction is the______
Gate
Steam boiler safety valve must be sized to prevent steam pressure from exceeding the MAWP by_____%
6%
Flame safeguard systems can monitor_____
Air temperature outside the building
Pilot and main flame
Feedwater pressure and temperature
Sensors used for flame detection in boilers include______
Leed sulfide cell
Ultraviolet scanner
Thermocouple
A_____blowdown is performed to remove sludge from the boiler
Bottom
A PH level of 7.0 is an indication that the boiler water is_____
Basic but watertube corrosion problems are probably under control
At sea level, atmospheric pressure is aproximately_____psi
14.7
Specific gravity is the ratio of weight of a volume of a substance to the weight of the same volume of_____
Water
Heat tranfer can occur by_____
Conduction
Convection
Radiation
Water weights approximately_____lb/gal
8.3
Boiler safety valves should be repaired by an_____
Authorized safety valve repair company
MSDS should only be available to supervisors and managers.
False
The EPA does not regulate discharges of waste water from utility and industrial boilers.
False
Foaming of boiler water from floating foreign matter causes an increase in______
Surface tension
Blowing down is most effective during a period when the steam output is_____
At a low rate
The water column must be located_____
At the normal operating water level
A boiler that is primming has_____
Water carried over with the steam
If the low water alarm sounds_____
Secure the fire
A feedwater pump can become steambound from_____
Feedwater temperature too high
Infrared or ultraviolet rays are sensed by the_____
Flame scanner
As the steam pressure increases in a boiler, there is a corresponding increase in the_____
Boiling temperature of the water in the boiler
Complete combustion is______
Burning all the fuel with the propwr amound of excess air
When testing a safety valve by hand on a low pressure steam boiler, the boiler must be be at a minimum pressure of____before the try lever can be lifted without damaging the valve
5 psi
Draft in a boiler is measured in_____
Inches of water
A positive pressure before the furnace indicates______draft
Forced
Preparation for a boiler inspection requires having the boiler_____
Cool, opened, and thoroughly cleaned
The firing rate of the burner is controlled by_____
Modulating pressure control
A fan located between the breeching and the stack is a______
Induced draft fan
Calss____fires are electrical fires, such a motor or transformer fire
C
A main steam stop valve would most likely be an_____
Os&y gate valve
The evaporation of 34.5 pounds of water per hour from and at 212’f is defined as______
One boiler horsepower
A compound gauge is a pressure gauge that indicates______
Vacuum in inches of mercury or pressure in psi on the same gauge
When burning no. 6 fuel oil, a____is required
Fuel oil heater
A_____prevents the flow of boiler water back to the city water supply
Backflow preventer
The amount of british thermal units (btu) per pound or gallon of fuel is the______
Heating value
______is the acumulation of minerals such as calcium and magnesium on boiler heating surfaces
Scale
Tubes in a firetube boiler are mounted into the_____located at the front anf rear of the boiler
Tube sheet
