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Intermediate boilers > Final Exam > Flashcards

Final Exam Flashcards

1
Q

A high pressure steam boiler is a steam boiler that operates at a maximum allowable working pressure (MAWP) of more than ___

A

15psi

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2
Q

When a steam boiler is operating @ 100psi the temperature of the water and steam will be approximately ____

A

338 degrees Fahrenheit

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3
Q

____ is the ratio of heat absorbed by a boiler (Output) to the heat available in the fuel (Input) including radiation and convection losses

A

Thermal Efficiency

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4
Q

A ___ is a fire-tube boiler with an internal furnace

A

Scotch marine

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5
Q

____ is a soft, muddy residue produced from impurities in water that accumulates in low spots in a boiler

A

Sludge or Mud

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6
Q

____ is the pressure @ which the density of water and steam are the same

A

Critical pressure

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7
Q

____ allow for circulation between the lower drum and the box headers

A

Down-Commers

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8
Q

Common bent-tube boilers configurations include ,,&_ styles

A

A, D ,& O Styles

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9
Q

A____ boiler is a water-tube boiler in which replaceable serpentine tubes are connected to upper and lower drums & surround the fire-tube.

A

Flex-tube

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10
Q

In resistance-coil electric boilers, electricity flows through a ___ conductor, which generates heat through resistance.

A

Coiled

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11
Q

A ____ does not require a burner to burn fuel because the hot gases already exist as a waste from another process.

A

Heat Recovery Steam Generator

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12
Q

Through stays are used to prevent ___ in boilers

A

Bulging

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13
Q

A ___ is a set of tubes that is placed in the furnace area of water-tube boilers & used to increase the heating surface of boilers & the service life of the refractory.

A

Water-walls

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14
Q

Finned boiler tubes can be used to increase the ____ of the boiler.

A

Heating surface

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15
Q

For both Fire-tube & Water-tube boilers, the tubes are measured by their ____.

A

O.D. (Outer Diameter)

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16
Q

Turbines require ____ for steam expansion without condensation.

A

Super-heated steam

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17
Q

__ generators are the most common generators used to produce electrical power.

A

AC

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18
Q

By using ____, it is possible for one plant to supply most or all of the required Electricity, Process steam, Heated water, & Air conditioning needed for a facility.

A

Cogeneration

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19
Q

A line desuperheater is used in conjunction with a _____.

A

Pressure Reducing Station

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20
Q

The flow of steam maintained through a superheater should never be less than ____ of the boilers capacity.

A

25%

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21
Q

When water is boiling, the water in a boiler & steam above are the same _____.

A

Pressure & Temperature.

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22
Q

Water hammer is caused by ____ & can lead to a line rupture.

A

mixing steam & water

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23
Q

Steam turbines usually require _____.

A

Dry & Superheated steam.

24
Q

The air injectors on the condenser of a steam turbine are used to remove air & other non-condensable gases from the ____.

A

Condenser

25
Q

Failure to maintain steam flow will result in ___ of superheater tubes.

A

Overheating

26
Q

The bellows of a thermostatic steam trap is usually filled with ___ & water solution to increase the sensitivity of the trap.

A

Alcohol

27
Q

Although the condensate tank is vented, it is possible to have a pressure buildup caused by ___.

A

Leaking steam traps

28
Q

A desuperheater is an accessory used to ____ to make it suitable for a process.

A

Remove heat from a superheated steam

29
Q

A steam trap can be tested with a ____ to determine if it is working properly.

A

Ultra-sonic device

30
Q

In large steam boiler plants, a ___ is necessary to provide the extra capacity required to handle charging loads & peak flows to the condensate.

A

Surge Tank

31
Q

The raw make-up water systems generally has a float chamber located at the ____ water level in a surge tank.

A

Minimum

32
Q

Transfer pumps are used to transfer the mixture of ____ from a surge tanks to the de-aerator or directly to the boiler feedwater pumps.

A

Condensate & raw make-up water

33
Q

Some ____ moisture separates automatically open & close because they use a wax that expands and contracts with temperature changes.

A

Variable-Orifice

34
Q

A ____ steam trap that has a single moveable disc that rises to allow the discharge of air & cool condensate.

A

Thermodynamic

35
Q

Water-tube boiler can be fitted with ____ to increase the heat content of steam.

A

SuperHeaters

36
Q

A ____ is a vessel used for healthy water to generate steam by direct application of heat from combustion fuels or electricity.

A

Closed loop Boiler

37
Q

A high pressure steam boiler is a boiler that operates at a maximum allowable working pressure of more than ____.

A

3,200psi

38
Q

A ____ boiler is a fire-tube boiler with an internal furnace.

A

Scotch Marine

39
Q

____ is the pressure at which the density of water and steam are the same.

A

Critical Pressure

40
Q

____ allow for circulation between the lower drum and the box headers

A

DownCommers

41
Q

Common bent-tube boiler configurations include _, , &.

A

A, D, & O

42
Q

A ____ boiler is a watertube boiler in which replaceable serpentine tubes are connected to the upper and lower drums & surround the fire-box.

A

Flex-Tube

43
Q

In resistance-coil electric boilers, electricity flows through a ____ conductor, which generates heat through resistance.

A

Coiled

44
Q

A ___ boiler is a boiler that uses the municipal solid waste that would normally go to landfills.

A

Refuse

45
Q

Waste boilers can use the heat from the incineration of ____.

A

Industrial Bi-Products

46
Q

A ____ does not require a burner to burn fuel because the hot gases already exist as waste from another process.

A

Heat recovery steam generator

47
Q

The ____ ensures that boilers & fittings are strong enough & made of suitable materials that can withstand the continuous stress of boiler operation.

A

ASME Code

48
Q

Standard boilers are approximately ___ % efficient.

A

80%

49
Q

Finned boiler tubes can be used to increase the ____ of the boiler.

A

Heat transfer surface

50
Q

For both fire-tube & water-tube boilers, the tubes are measured by their ____.

A

O.D (outer diameter)

51
Q

Fire tubes in fire-tube boilers are subjected to ____ stress.

A

Compressive

52
Q

Oil refineries typically use steam for ____ in the refining process.

A

Distillation of petroleum products

53
Q

steam can be used to help ____ concrete.

A

Dry

54
Q

Turbines require _____ for steam expansion without condensation.

A

Superheated steam

55
Q

___ generators are the most common generators used to produce electrical power.

A

AC

56
Q

By using ____, it is possible for one plant to supply most or all the requires Electricity, Process steam, Heated water, & Air conditioning needs for a facility.

A

Cogeneration

Intermediate boilers (1 decks)

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