Watertube Flashcards
An advantage of packaged waterline boiler is:
It’s only available with straight tubes
It’s custom built on site
No steam space is required
A single supplier provides all components
It does not use softened water
A single supplier provides all components
The combustion chamber of a serpentine water tube boiler is:
Located below the tubes
Has inefficient heat transfer
Is surrounded by the tube
Is enclosed by non insulated metal casing
Is located above the tube
Is located below the tubes
In comparison to a fire tube boiler, a water tube boiler of the same capacity is:
More destructive in the event of a furnace explosion
Less destructive in the event of pressure part failure
More destructive
Less destructive in the event of a pressure part failure
A water tube boiler:
Has tubes surrounded by combustion gases
Contain combustion gases within the tubes
Tends to have higher stack temps
Is a boiler consisting of tubes within a shell
Has tubes surrounded by water
Has tubes surrounded by combustion gases
In comparison to a fire tube boiler, a water tube boiler of the same capacity:
Is less efficient
Has little differences in expense or efficiency
Is less expensive to construct
Is more expensive to construct
Is more expensive to construct
The upper drum of a packaged water tube steam boiler is referred to as: Mud drum Steam drum Water drum Blowoff drum Pressure drum
Steam drum
Boiler circulation is driven by: Formation of steam in the tubes Water density differences Tubing arrangement Heat All of the above
All of the above
In comparison to a fire tube boiler, a water tube boiler of the same capacity:
Can respond to load changes more quickly
There is no difference
As a higher reserve steam capacity is slow to generate steam pressure
Contains more water
Can respond to load changes more quickly
In order to keep dissolved solids concentrations within safe limits the packaged tubular steam boiler utilizes an:
Liquid flow control device
Automatic blowdown
Water softener after the condensate receiver
Mixing chamber before heating coil
Automatic blowdown
Disadvantage of the water tube or tubular boiler is: It’s long warmup period The foundation required due to mass Water treatment monitoring It’s thermal stresses It’s high maintenance cost
Water treatment monitoring
A water tube boiler is a boiler in which: Air passes through the tubes Air passes around the tubes Combustion gases pass through the tubes Water passes through the tubes Water passes around the tubes
Water passes through the tubes
Reason for preferring copper tubing in tubular boilers is : high metal expansion Corrosion resistance Eliminating of feed water treatment Ease of replacement of tubes Low cost
Corrosion resistance
An advantage of a bent tubes boiler is:
The tubes form baffles and furnace water walls
Only one drum is required
It doesn’t require a pressure relief valve the boiler requires additional refractory
The tubes form baffles and furnace water walls
A bent tube boiler design allows the tubes to create water walls that connect: air pre heater
Upper and lower drums
Economiser
Superheater
Upper and lower drum
The serpentine tubes are attached to upper and lower headers with: Pressure sealed Seamless Threaded Nozzle Welded
Threaded
