24 Questions
EASY What are the factors that influence the frequency of waterside cleaning?
Operating schedule, operating conditions, feedwater quality, and water treatment control
What is the primary purpose of using mechanical means to remove deposits from boiler surfaces?
To remove scale and improve efficiency
What type of tools are used to remove scale from watertube boilers?
Both hand tools and power-driven tools
What is the purpose of directing a stream of water into the tube during mechanical cleaning?
To cool the cutter head and wash out scale
Why are mechanical cleaning methods not commonly used for larger watertube boilers?
Access to certain areas is limited
What is the primary method used to clean firetube boilers?
Chemical cleaning
What is done to the tubes after mechanical cleaning is complete?
They are flushed with high-pressure water
What is shown in Figures 2, 3, and 4?
Mechanical cleaning heads for watertube boilers
MEDIUM What is the primary challenge in mechanically cleaning larger watertube boilers?
The complexity of the boiler design
What is the purpose of using power tools in mechanical cleaning?
To cut or knock the deposit from the surfaces
Why are mechanical cleaning methods not suitable for firetube boilers?
There are no satisfactory methods to mechanically clean the scale
What is the result of using mechanical cleaning methods on larger watertube boilers?
The process is very expensive and time-consuming
What is the function of hand tools in mechanical cleaning?
To scrape, broom, or brush the surfaces
What is driven by small water-driven motors, compressed air driven motors, or electric motors in mechanical cleaning?
The mechanical cleaning tools
Why are mechanical cleaning methods used mostly on smaller watertube boilers?
Because they are less complex in design
What is done to the tubes after mechanical cleaning is complete?
They are flushed with high-pressure water
HARD What is a common limitation of using mechanical cleaning methods on larger watertube boilers?
Inaccessible headers and tubes
Why are mechanical cleaning methods often time-consuming and expensive?
They require specialized tools and skilled labor
What is the primary advantage of using chemical cleaning methods for firetube boilers?
Effectiveness in removing scale buildup
What is the purpose of flushing the tubes with high-pressure water after mechanical cleaning?
To remove loose scale from the tube walls
What type of motor is used to power mechanical cleaning tools in watertube boilers?
Electric motor
What is the main difference between hand tools and power tools used in mechanical cleaning?
Hand tools are manually operated, while power tools are motorized
Why are rotary wire brushes used in mechanical cleaning of watertube boilers?
To cut through scale deposits
What is the primary purpose of using a stream of water during mechanical cleaning?
To cool the cutter head
Study Notes
Waterside Cleaning
- Frequency of waterside cleaning depends on operating schedule, operating conditions, feedwater quality, and water treatment control.
Mechanical Cleaning Methods
- Removal of deposits from boiler surfaces involves using hand tools or power-driven tools.
- Hand tools include scrapers, brooms, wire brushes, steam, water, or air lances.
- Power tools include those that cut or knock deposits from surfaces.
- In watertube boilers, scale forms on the inside surfaces of tubes, and can be removed with rotary wire brushes, cutters, and drill heads.
- Mechanical cleaning tools are powered by small water-driven motors, compressed air driven motors, or electric motors.
- Tools are manually guided through water tubes, and a stream of water is directed into the tube to provide cooling for the cutter heads and wash out scale.
- After mechanical cleaning, tubes are flushed with high-pressure water to remove loose scale from tube walls.
Limitations of Mechanical Cleaning
- Mechanical cleaning methods are mostly used on smaller watertube boilers.
- Larger watertube boilers are complex in design, making headers and other areas inaccessible, making mechanical cleaning impractical.
- Long, bent tubes are difficult or impossible to clean mechanically.
- Removing drum internals is time-consuming, making mechanical cleaning of large boilers expensive and not always effective.
Firetube Boilers
- There are no satisfactory methods to mechanically clean scale from firetube boilers.
- Firetube boilers are exclusively cleaned of excess scale buildup by chemical cleaning methods.
Waterside Cleaning
- Frequency of waterside cleaning depends on operating schedule, operating conditions, feedwater quality, and water treatment control.
Mechanical Cleaning Methods
- Removal of deposits from boiler surfaces involves using hand tools or power-driven tools.
- Hand tools include scrapers, brooms, wire brushes, steam, water, or air lances.
- Power tools include those that cut or knock deposits from surfaces.
- In watertube boilers, scale forms on the inside surfaces of tubes, and can be removed with rotary wire brushes, cutters, and drill heads.
- Mechanical cleaning tools are powered by small water-driven motors, compressed air driven motors, or electric motors.
- Tools are manually guided through water tubes, and a stream of water is directed into the tube to provide cooling for the cutter heads and wash out scale.
- After mechanical cleaning, tubes are flushed with high-pressure water to remove loose scale from tube walls.
Limitations of Mechanical Cleaning
- Mechanical cleaning methods are mostly used on smaller watertube boilers.
- Larger watertube boilers are complex in design, making headers and other areas inaccessible, making mechanical cleaning impractical.
- Long, bent tubes are difficult or impossible to clean mechanically.
- Removing drum internals is time-consuming, making mechanical cleaning of large boilers expensive and not always effective.
Firetube Boilers
- There are no satisfactory methods to mechanically clean scale from firetube boilers.
- Firetube boilers are exclusively cleaned of excess scale buildup by chemical cleaning methods.
Waterside Cleaning
- Frequency of waterside cleaning depends on operating schedule, operating conditions, feedwater quality, and water treatment control.
Mechanical Cleaning Methods
- Removal of deposits from boiler surfaces involves using hand tools or power-driven tools.
- Hand tools include scrapers, brooms, wire brushes, steam, water, or air lances.
- Power tools include those that cut or knock deposits from surfaces.
- In watertube boilers, scale forms on the inside surfaces of tubes, and can be removed with rotary wire brushes, cutters, and drill heads.
- Mechanical cleaning tools are powered by small water-driven motors, compressed air driven motors, or electric motors.
- Tools are manually guided through water tubes, and a stream of water is directed into the tube to provide cooling for the cutter heads and wash out scale.
- After mechanical cleaning, tubes are flushed with high-pressure water to remove loose scale from tube walls.
Limitations of Mechanical Cleaning
- Mechanical cleaning methods are mostly used on smaller watertube boilers.
- Larger watertube boilers are complex in design, making headers and other areas inaccessible, making mechanical cleaning impractical.
- Long, bent tubes are difficult or impossible to clean mechanically.
- Removing drum internals is time-consuming, making mechanical cleaning of large boilers expensive and not always effective.
Firetube Boilers
- There are no satisfactory methods to mechanically clean scale from firetube boilers.
- Firetube boilers are exclusively cleaned of excess scale buildup by chemical cleaning methods.
This quiz covers the aspects of boiler operation, including waterside cleaning and scale removal. It also touches on the use of hand and power tools in boiler maintenance.
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