Podcast
Questions and Answers
_________ are necessary for complete combustion.
_________ are necessary for complete combustion.
time, temperature, mixture, and atomization
If the steam pressure gauge indicates 200 PSIG, the absolute pressure is______.
If the steam pressure gauge indicates 200 PSIG, the absolute pressure is______.
214.7
A boiler is operating at 400 PSI, and the safety valve opens at 410 PSI and closes at 398 PSI. The blowdown is______ psi.
A boiler is operating at 400 PSI, and the safety valve opens at 410 PSI and closes at 398 PSI. The blowdown is______ psi.
12
An oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-generator.
An oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-generator.
A boiler is producing 40,000 lb of steam/hr at a pressure of 100 PSI and a steam temperature of 500 degrees Fahrenheit. The steam produced is _______ steam.
A boiler is producing 40,000 lb of steam/hr at a pressure of 100 PSI and a steam temperature of 500 degrees Fahrenheit. The steam produced is _______ steam.
The economizer on a boiler is used to _______.
The economizer on a boiler is used to _______.
Blowers are normally used with________ boilers.
Blowers are normally used with________ boilers.
Overheating of tubes on a boiler can be caused by________.
Overheating of tubes on a boiler can be caused by________.
Carbon dioxide in a condensate return system causes_________.
Carbon dioxide in a condensate return system causes_________.
A ________ pump is a positive displacement pump.
A ________ pump is a positive displacement pump.
A boiler generating 6000 lb of steam/hr produces _______ btu/hr.
A boiler generating 6000 lb of steam/hr produces _______ btu/hr.
A bottom blowdown is performed on a boiler to _____ .
A bottom blowdown is performed on a boiler to _____ .
Water columns are connected to the boiler with a minimum of ______" pipe.
Water columns are connected to the boiler with a minimum of ______" pipe.
The minimum size of a water column blowdown valve is_______".
The minimum size of a water column blowdown valve is_______".
The maximum size bottom blowdown valve on a boiler is_________".
The maximum size bottom blowdown valve on a boiler is_________".
A ________ allows condensate to pass through, but stops steam.
A ________ allows condensate to pass through, but stops steam.
When taking over a shift, the first thing to do is check the________.
When taking over a shift, the first thing to do is check the________.
According to the ASME code, a high-pressure boiler having more than 500 square feet of heating surface shall have________.
According to the ASME code, a high-pressure boiler having more than 500 square feet of heating surface shall have________.
The probable cause of an increase in temperature of gases of combustion at the boiler outlet is____.
The probable cause of an increase in temperature of gases of combustion at the boiler outlet is____.
Boilers in battery equipped with________ must have two main steam stop valves and a free-flowing drain between them.
Boilers in battery equipped with________ must have two main steam stop valves and a free-flowing drain between them.
In order to be sure the gauge glass is indicating an accurate water level reading, the stationary engineer should______.
In order to be sure the gauge glass is indicating an accurate water level reading, the stationary engineer should______.
A continuous blowdown line is located___ .
A continuous blowdown line is located___ .
A temperature reading of 80 degrees Celsius is equal to_________°F.
A temperature reading of 80 degrees Celsius is equal to_________°F.
A chimney temperature of 250 degrees Fahrenheit above steam temperature indicates_______ .
A chimney temperature of 250 degrees Fahrenheit above steam temperature indicates_______ .
A manometer is read in________ .
A manometer is read in________ .
The boiling point of water will____ with an increase in pressure.
The boiling point of water will____ with an increase in pressure.
If a lather is not obtained when performing a soap hardness test, the water sample is______.
If a lather is not obtained when performing a soap hardness test, the water sample is______.
Combustion efficiency can be increased when air is________.
Combustion efficiency can be increased when air is________.
______ draft is produced by a fan located between the boiler and the chimney.
______ draft is produced by a fan located between the boiler and the chimney.
The overspeed trip on a steam turbine should be tested ______.
The overspeed trip on a steam turbine should be tested ______.
A high CO2 reading in the gases of combustion is a sign of____.
A high CO2 reading in the gases of combustion is a sign of____.
The purpose of chemically treating feedwater is to________.
The purpose of chemically treating feedwater is to________.
Water in a D rating feed water heater is prevented from entering the steam line by a(n) _______.
Water in a D rating feed water heater is prevented from entering the steam line by a(n) _______.
A steam turbine operating at 3600 RPM will trip at_________ RPM.
A steam turbine operating at 3600 RPM will trip at_________ RPM.
The steam line going to the blowers is connected to the main ________.
The steam line going to the blowers is connected to the main ________.
Before using blowers on a boiler,________.
Before using blowers on a boiler,________.
An accumulation of snow on the Fireside of boiler tubes________.
An accumulation of snow on the Fireside of boiler tubes________.
A globe valve installed in the feed water line between the feed water pump and boiler has a pressure from the feed water pump_________ the valve disc.
A globe valve installed in the feed water line between the feed water pump and boiler has a pressure from the feed water pump_________ the valve disc.
The range of a pressure gauge should be twice the safety valve setting, but not less than______ times the safety valve setting.
The range of a pressure gauge should be twice the safety valve setting, but not less than______ times the safety valve setting.
Hard scale formed on the inside of tubes is best removed by________.
Hard scale formed on the inside of tubes is best removed by________.
To correct a low water condition,_____ .
To correct a low water condition,_____ .
Desuperheater drain is used to_______ .
Desuperheater drain is used to_______ .
A sudden rise in chimney temperature with no increase in load indicates_______.
A sudden rise in chimney temperature with no increase in load indicates_______.
The BTU content of natural gas is_____ .
The BTU content of natural gas is_____ .
The safety valve setting on the steam and water drum is ________ a superheater safety valve.
The safety valve setting on the steam and water drum is ________ a superheater safety valve.
The BTU content of number 6 fuel oil is approximately.
The BTU content of number 6 fuel oil is approximately.
Chemicals can be added to a boiler by a______ pump.
Chemicals can be added to a boiler by a______ pump.
The feed water stop valve is found between the____.
The feed water stop valve is found between the____.
Sensible heat is______.
Sensible heat is______.
Balanced draft is______.
Balanced draft is______.
A flame rod_______ .
A flame rod_______ .
There are approximately_____ btu in 1 cu ft of Natural Gas.
There are approximately_____ btu in 1 cu ft of Natural Gas.
The pH of boiler water may be controlled by using ______.
The pH of boiler water may be controlled by using ______.
Boiler water with a pH of 11 is________.
Boiler water with a pH of 11 is________.
A Scotch Marine boiler is easily identified because it_____ .
A Scotch Marine boiler is easily identified because it_____ .
The air flow switch at the burner fan housing________.
The air flow switch at the burner fan housing________.
The ASME code recommends that low water fuel cutoff switch be tested by an evaporation test__________.
The ASME code recommends that low water fuel cutoff switch be tested by an evaporation test__________.
A neutral solution is_______ on the pH scale.
A neutral solution is_______ on the pH scale.
A dry pipe separator _____ .
A dry pipe separator _____ .
Draft is carefully controlled to_____ .
Draft is carefully controlled to_____ .
Draft is measured with a_________.
Draft is measured with a_________.
A Ringelmann test is used to determine_______.
A Ringelmann test is used to determine_______.
A flame scanner proves (verifies) __________.
A flame scanner proves (verifies) __________.
According to the ASME code, when warming up a boiler the air cock is closed when_______.
According to the ASME code, when warming up a boiler the air cock is closed when_______.
A motor rated at 25 horsepower delivering 20 horsepower is operating at_______% capacity.
A motor rated at 25 horsepower delivering 20 horsepower is operating at_______% capacity.
A deposit of scale or mud in an HRT boiler could cause_____.
A deposit of scale or mud in an HRT boiler could cause_____.
Water wall tubes protect the refractory and_____ .
Water wall tubes protect the refractory and_____ .
Steam at 250 psia and 400 degrees Fahrenheit is considered______ steam.
Steam at 250 psia and 400 degrees Fahrenheit is considered______ steam.
Sensible heat is heat that_____.
Sensible heat is heat that_____.
Extra-heavy pipe must be used on blowdown lines when the steam pressure exceeds______ psi.
Extra-heavy pipe must be used on blowdown lines when the steam pressure exceeds______ psi.
To check the water level on a boiler online, it is best to_____ .
To check the water level on a boiler online, it is best to_____ .
A steam pressure gauge has a siphon between the boiler and the pressure gauge to _______.
A steam pressure gauge has a siphon between the boiler and the pressure gauge to _______.
If a boiler evaporates 50,000 lbs of steam/hour and is evaporating 10 pounds of steam/sq ft of heating surface, the heating surface of the boiler is ____sq ft.
If a boiler evaporates 50,000 lbs of steam/hour and is evaporating 10 pounds of steam/sq ft of heating surface, the heating surface of the boiler is ____sq ft.
Oxygen in feed water causes ______.
Oxygen in feed water causes ______.
It is permissible to have one blowdown valve on a boiler operated under______ psi.
It is permissible to have one blowdown valve on a boiler operated under______ psi.
At atmospheric pressure, water boils and turns to steam at _____ °F.
At atmospheric pressure, water boils and turns to steam at _____ °F.
A steam pressure gauge is protected against excessive temperature by a ______.
A steam pressure gauge is protected against excessive temperature by a ______.
The only type of safety valve allowed on a boiler by the ASME code is a_____ safety valve.
The only type of safety valve allowed on a boiler by the ASME code is a_____ safety valve.
The primary function of a boiler is to _____ .
The primary function of a boiler is to _____ .
If the burner is firing and no water is in the gauge glass, the best procedure to follow is to_______.
If the burner is firing and no water is in the gauge glass, the best procedure to follow is to_______.
A high pressure boiler operates at a pressure above______ PSI and 6 BHP.
A high pressure boiler operates at a pressure above______ PSI and 6 BHP.
A safety valve on a boiler pops______.
A safety valve on a boiler pops______.
In a fire tube boiler, the heat and gases of combustion pass _________.
In a fire tube boiler, the heat and gases of combustion pass _________.
As steam pressure in a boiler increases, there is a corresponding increase in the ______.
As steam pressure in a boiler increases, there is a corresponding increase in the ______.
The safety valve on a boiler _____ .
The safety valve on a boiler _____ .
A steam trap ______.
A steam trap ______.
The amount of excess air in gases of combustion is normally determined by the analysis of_______.
The amount of excess air in gases of combustion is normally determined by the analysis of_______.
Before lighting off a boiler during a cold startup, the operator must first______.
Before lighting off a boiler during a cold startup, the operator must first______.
A boiler should be warmed up slowly when starting up to ______.
A boiler should be warmed up slowly when starting up to ______.
Combustion requires____.
Combustion requires____.
The three most common fuels used in boilers are _____.
The three most common fuels used in boilers are _____.
Incomplete combustion can be caused by ______.
Incomplete combustion can be caused by ______.
After replacing a gauge glass but before placing it in service, it is necessary to ______.
After replacing a gauge glass but before placing it in service, it is necessary to ______.
Two bottom blowdown valves are required on boilers operating at pressures above______ psi.
Two bottom blowdown valves are required on boilers operating at pressures above______ psi.
Extra heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above ____ psi.
Extra heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above ____ psi.
Package boilers are programmed to _____.
Package boilers are programmed to _____.
There are________ sq ft of heating surface in a water tube 3 1/2" in diameter and 20' long.
There are________ sq ft of heating surface in a water tube 3 1/2" in diameter and 20' long.
To change 1 lb of water from and at 212 °F into steam at atmospheric pressure,______ btu are necessary.
To change 1 lb of water from and at 212 °F into steam at atmospheric pressure,______ btu are necessary.
A surface condenser is one that______.
A surface condenser is one that______.
A boiler is rated at 30,000 lb/hr and has a 5% blow down loss. The minimum size feed water pump to supply this boiler is ________ gal./hr.
A boiler is rated at 30,000 lb/hr and has a 5% blow down loss. The minimum size feed water pump to supply this boiler is ________ gal./hr.
Flashcards
Complete combustion
Complete combustion
Requires the right amount of time, temperature, fuel-air mixture, and atomization for full burning.
Incomplete combustion
Incomplete combustion
Occurs when there isn't enough air for complete burning, resulting in less efficient fuel use.
Preheating air
Preheating air
Improving combustion efficiency by warming the air before it mixes with fuel.
High CO2
High CO2
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Absolute pressure
Absolute pressure
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Safety valve
Safety valve
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High-pressure boilers
High-pressure boilers
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Superheated steam
Superheated steam
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Oil cooler
Oil cooler
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Continuous blowdown
Continuous blowdown
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Economizer
Economizer
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Water treatment
Water treatment
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Pitting
Pitting
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Reciprocating pump
Reciprocating pump
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Steam trap
Steam trap
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Manometer
Manometer
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Low water fuel cutoff
Low water fuel cutoff
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Chimney temperature rise
Chimney temperature rise
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BTUs
BTUs
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Water boiling point
Water boiling point
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Draft
Draft
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Sensible heat
Sensible heat
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Scotch Marine boiler
Scotch Marine boiler
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Fire tube boiler
Fire tube boiler
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Water tube boiler
Water tube boiler
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Steam line safety valve
Steam line safety valve
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Study Notes
Combustion and Efficiency
- Complete combustion requires time, temperature, mixture, and atomization.
- Inadequate air can lead to incomplete combustion.
- Preheating air can enhance combustion efficiency.
- High levels of carbon dioxide indicate high combustion efficiency.
Steam Pressure and Safety
- Absolute pressure is calculated by adding atmospheric pressure to PSIG (e.g., 200 PSIG equals 214.7 psi).
- A safety valve on a boiler should open at a preset pressure (e.g., 410 PSI) and close at a lower pressure (e.g., 398 PSI), resulting in a blowdown of 12 psi.
- High-pressure boilers (above 15 PSI) must have two or more safety valves if exceeding 500 square feet of heating surface.
Boiler Operation
- A boiler producing 40,000 lb/hr of steam at 100 PSI and 500°F generates superheated steam.
- An oil cooler is typically used with steam turbines operating a turbo-generator.
- Continuous blowdown is located in the steam and water drum below the water level.
Water Treatment and Features
- The economizer adds heat to feed water to improve efficiency.
- Chemically treating feedwater prevents scale formation by turning salts into sludge.
- Oxygen presence in boiler water can cause pitting; the pH level can be maintained using caustic soda.
Mechanical Components
- A reciprocating pump is a type of positive displacement pump.
- A steam trap prevents steam escape while allowing condensate to pass.
- A manometer measures draft in inches of water, essential for ensuring proper combustion.
Maintenance and Testing
- Regular testing of low water fuel cutoff switches is recommended monthly.
- A sudden chimney temperature rise without increased load suggests a broken baffle.
- Before lighting a boiler, it's crucial to check the water level.
Measurement and Units
- The boiling point of water increases with pressure.
- Draft should be maintained slightly below atmospheric for efficient combustion.
- Sensible heat refers to heat measured by a thermometer affecting temperature without changing the state.
Boiler Types and Specifications
- A Scotch Marine boiler features a cylindrical internal furnace.
- Fire tube boilers have heat and gases passing through tubes, while water tube boilers are equipped with blowers.
- The safety valve on a steam line should be spring-loaded pop type as per ASME code.
Troubleshooting and Safety Protocols
- If a gauge glass indicates no water while the burner is firing, immediately shut down the burner.
- To manage low water conditions, securing the fires is essential.
- Ensuring gauge glass accuracy requires periodic blowdowns to clear obstructions.
Fuel and Energy Conversion
- The BTU content for various fuels includes approximately 100,000 BTUs/therm for natural gas and 18,750 BTUs/lb for number 6 fuel oil.
- Converting water at 212°F to steam necessitates around 970.3 BTUs per pound.
Boiler Design and Configuration
- Boilers operating above 100 psi require two bottom blowdown valves.
- The relationship between steam pressure and temperature is direct; as one increases, so does the other.
- A dry pipe separator improves steam quality by removing impurities before steam delivery to headers.
Efficiency Metrics
- Excess air in combustion gases may be evaluated via O2 analysis.
- To ensure proper functioning, blowdown lines need to be drained before operation.
Capacity and Performance
- A motor rated for 25 HP delivering 20 HP operates at 80% efficiency.
- The heating surface in a water tube boiler is calculated from dimensions, providing a basis for performance calculations.
Best Practices
- Slow warm-up procedures during boiler start-up help avoid thermal stress on components.
- Excessive scaling is best addressed with air- or water-driven turbines for removal.
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Description
Prepare for the 3rd class stationary steam engineer license with these flashcards. The quiz covers essential concepts such as combustion, pressure calculations, and safety valve operations. Perfect for anyone looking to enhance their knowledge in steam engineering.
