Water tube boilers Flashcards
An advantage of a packaged watertube boiler is:
A) It is only available with straight tubes
B) It does not use softened water
C) A single supplier provides all components
D) No steam space is required
E) It is custom built on site
C) A single supplier provides all components
The combustion chamber of a serpentine tube watertube boiler:
A) Is located below the tubes
B) Is located above the tube
C) Is surrounded by the tube
D) Has inefficient heat transfer
E) Is enclosed by a non-insulated metal casing
A) Is located below the tubes
In comparison to a firetube boiler, a watertube boiler of the same capacity is:
A) Less destructive in the event of a pressure part failure
B) More destructive in the event of a pressure part failure
C) Less destructive in the event of a furnace explosion
D) There is no difference between the two types of boiler
E) More destructive in the event of a furnace explosion
A) Less destructive in the event of a pressure part failure
A watertube boiler:
A) Has tubes surrounded by combustion gases
B) Is a boiler consisting of tubes within a shell
C) Tends to have higher stack temperatures
D) Has tubes surrounded by water
E) Contains combustion gases within the tubes
A) Has tubes surrounded by combustion gases
In comparison to a firetube boiler, a watertube boiler of the same capacity:
A) Is more expensive to construct
B) Is less expensive to construct
C) Has little difference in expense or efficiency
D) Is more efficient
E) Is less efficient
A) Is more expensive to construct
The upper drum of a packaged watertube steam boiler is referred to as the:
A) Pressure drum B) Mud drum C) Blowoff drum D) Water drum E) Steam drum
E) Steam drum
Boiler circulation is driven by: A) Heat B) Water density difference C) All of the answers shown D) Tubing arrangement E) Formation of steam in the tubes
C) All of the answers shown
n comparison to a firetube boiler, a watertube boiler of the same capacity:
A) As a higher reserve steam capacity
B) Can respond to load changes more quickly
C) There is no difference in steam generating capability
D) Is slow to generate steam pressure
E) Contains more water
B) Can respond to load changes more quickly
In order to keep dissolved solids concentrations within safe limits the packaged tubular steam boiler utilizes a/an:
A) Automatic blowdown
B) Desalinator
C) Liquid flow control device
D) Water softener after the condensate receiverE) Mixing chamber before the heating coil
A) Automatic blowdown
A disadvantage of the watertube or tubular boiler is:
A) Water treatment monitoring B) Its long warm-up period C) Its high maintenance cost D) Its thermal stresses E) The foundation requirements due to mass
A) Water treatment monitoring
A watertube boiler is a boiler in which: A) Air passes around the tubes B) Air passes through the tubes C) Water passes through the tubes D) Water passes around the tubes E) Combustion gases pass through the tubes
C) Water passes through the tubes
A reason for preferring copper tubing in a tubular boiler is:
A) Only one drum is required
B) Tubes are easily replaced compared to straight tube
C) The boiler requires additional refractory
D) The tubes form baffles and furnace water walls
E) It doesn’t require a pressure relief valve
D) The tubes form baffles and furnace water walls
The bent tube boiler design allows the tubes to create waterwalls that connect:
A) Threaded B) Seamless C) Welded D) Pressure sealed E) Nozzle
A) Threaded
Three common types of bent tube watertube boilers are: A) B, D and O B) A, O and D C) B, O and D D) O, D and E E) D, O and L
B) A, O and D
Feedwater that is fed into the boiler to replace water that has been converted into steam is called: A) Fresh water B) Condensate C) Softened water D) Reused water E) Return water
C) Softened water
