55 Questions
What is the angle of inclination of the water tubes in a Babcock and Wilcox water tube boiler?
15°
Where is the feed valve located in a Babcock and Wilcox water tube boiler?
Drum
How are the hot gases forced to move in a Babcock and Wilcox water tube boiler?
Upwards
What type of material are the inclined water tubes made of in a Babcock and Wilcox water tube boiler?
Solid drawn mild steel
What indicates the level of water in a Babcock and Wilcox water tube boiler?
Water level indicator
What purpose does the hand hole in front of each tube serve in a Babcock and Wilcox water tube boiler?
To inspect and clean tubes
How many 'U' tubes of steel are generally attached to one pair of headers in Sugden's superheater?
40 tubes
What happens to the valves when the steam is passed through the superheater?
V1 is closed, V2 and V3 are opened
What controls the path of gases in Sugden's superheater?
Damper
In what conditions can steam be available from a boiler?
Wet, dry, or superheated
What type of boiler is associated with Sugden's superheater?
Lancashire boiler
How are the steel 'U' tubes arranged in Sugden's superheater?
In groups of four
What is the purpose of the antipriming pipe in a boiler system?
To ensure a steady flow of steam into the superheater tubes
How does a Babcock Wilcox water tube boiler with a cross drum differ from one with a longitudinal drum?
The cross drum allows unlimited connections to tubes circumferentially, while the longitudinal drum has limitations.
What is the function of the baffle in the steam drum of a Stirling water tube boiler?
To prevent impurities from entering the steam space
What role does the mud drum play in a Stirling water tube boiler?
To collect mud particles and impurities from the water
Why are brick-wall baffles used in a boiler system?
To direct combustion products and ensure proper circulation
What is a notable advantage of bent tube boilers over straight tube boilers?
They are lighter and more flexible in construction
How does the feed water move through a Stirling water tube boiler from the steam drum to the mud drum?
Through rearmost water tubes at the backside
What is the function of the manhole provided at each end of the drum in a Stirling water tube boiler?
To facilitate cleaning and maintenance operations
What is the main reason why scotch type marine boilers are popular?
They have a high steaming capacity
Why are shell boilers preferred for applications requiring steam at pressures below 30 bar?
They are cheaper than water tube boilers
What is a unique feature of high pressure boilers related to the type of tubing used?
Arrangement to reduce pressure loss
Which modern high pressure boiler feature helps increase the heat transfer process?
Mixing superheated steam with water
What is the main advantage of water tube boilers over shell boilers for high pressure applications?
Better control over steam quality
In high pressure boiler plants, what is the primary method used for water circulation?
Forced circulation using pumps
What is the main limitation of using natural circulation in high pressure boiler plants?
Limited to sub-critical boilers
What is a key advantage of high-pressure boilers over low-pressure boilers in terms of steam temperature?
High-pressure boilers can achieve higher maximum steam temperatures.
What is the main difference between a single-acting pump and a double-acting pump?
The water is displaced by both sides of the piston in a double-acting pump.
How are the feed pumps in a duplex direct-acting steam pump powered?
Powered by small steam turbines
What is the function of an injector in a boiler system?
To feed water into the boiler using steam pressure
What does an economiser do in a boiler system?
It converts waste heat from flue gases to heat the feed water.
How does a double feed pump differ from a rotary feed pump?
Double feed pumps utilize centrifugal force, whereas rotary feed pumps are driven by steam.
Why is an injector not suitable for large capacity high-pressure boilers?
Irregular operation under extreme steam pressure variations
What type of boiler has a dome-shaped top and a hemispherical crown providing maximum volume of space?
Cochran boiler
Why are hand-holes provided at the ends of each cross tube in boilers?
To give access for cleaning
In which type of boiler does the sediment in water fall to the bottom, away from the hottest portion of furnace gases?
Cornish boiler
What is the purpose of the manhole in a boiler?
To clean interior and exterior
Which feature makes the Lancashire boiler commonly used in sugar mills and textile industries?
Ease of operation
How are the combustion gases directed to pass through a number of horizontal tubes in the Cochran boiler?
By fire brick lining
What is the purpose of the fire bridge in a locomotive boiler?
To prevent entry of burning coal and ashes into the furnace tubes
In a locomotive boiler, what is the function of the superheater tubes?
To transmit heat from hot gases into the water through the heating surface of the fire tubes
What is the main function of a steam dome in a locomotive boiler?
To collect steam over the water surface
Why can't natural draught be obtained in a locomotive boiler?
It requires a very high chimney which cannot be provided on a locomotive boiler
What purpose does the blast pipe serve in a locomotive boiler?
To produce a correct draught by using exhaust steam from the cylinders
What are some common boiler mountings mentioned for a locomotive boiler?
Pressure gauge, water level indicator, man hole, feed check valve
What is one of the demerits mentioned for a locomotive boiler?
Chances of corrosion and scale formation in water legs due to sediment accumulation
Why are pumps used in high-pressure boilers?
To maintain forced circulation of water
What is a key advantage of using small diameter tubes in large numbers in high-pressure boilers?
Utilizing the heat of combustion more efficiently
What is a major problem faced in LaMont boilers due to salt and sediment deposition?
Decreased generating capacity
How is feed water evaporated in a Loeffler boiler?
By means of superheated steam from the superheater
What is a distinguishing feature of Loeffler boilers compared to other types?
Ability to carry higher salt concentrations
Which type of pump is commonly used as a feed pump in steam boilers according to the text?
Reciprocating pump
Why are multiple steam drums not required in high-pressure boilers?
To increase evaporative capacity
What does pressurised combustion do in terms of fuel firing rate?
Increases the rate of firing of fuel
Learn about water tube boilers, specifically the Babcock and Wilcox type. Explore the two types of water tube boilers: Horizontal straight tube and Bent tube. Understand the applications and design considerations for Babcock and Wilcox boilers.
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