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Stationary engineering > Homework > Flashcards

Homework Flashcards

1
Q

Charles second law

A

For a constant volume process, pressure increases as temp increases

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2
Q

Saturated steam

A

Temp corresponds with pressure

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3
Q

Superheated steam

A

Temp above corresponding pressure

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4
Q

Charles first law

A

For a constant pressure process, volume increases as temp increases

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5
Q

Boyles law

A

Constant temp process, change in pressure causes opposite change in volume

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6
Q

Solid and hollow Staybolts

A

Hold inner and outer wrapper sheets together. 3/16” telltale hole

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7
Q

Girder stay

A

Used on crown sheet of scotch marine

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8
Q

Radial stay

A

Superseded girder stay, more flexible and hold less scale.

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9
Q

Diagonal stay

A

Above tubes to stay flat portions of heads not supported by tubes

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10
Q

Caustic embrittlement

A

High alkaline material leads to breakdown and weakening of boiler metal

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11
Q

Dog stay

A

Used on man and hand holes

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12
Q

Solid through stays

A

Holds rear and front tube sheets. Nuts on inside and outside of boiler drum

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13
Q

Float feedwater regulator

A

Float operates off water level and moves a mercury switch

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14
Q

Bhp

A

33475 btus

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15
Q

One vertical foot water column

A

.433

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16
Q

Water column pipe requirements

A

Minimum 1” pipe. 3/4” blowdown.
0-250F cast iron
251-350 malleable iron
351+ steel

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17
Q

Thermodynamic steam trap

A

Single moving disk. Steam pushes disk down to close discharge and condensate pushes disk up to open.

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18
Q

Blowdown pipe requirements

A

1” minimum 2.5” max.

Boilers over 100psi require two

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19
Q

How many turns to open slow opening valve

A

5

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20
Q

Carryover

A

Small amount of water enters header

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21
Q

Priming

A

Large amount of water enters header

22
Q

Hp

A

33000 ftlbs/min

23
Q

Float thermostatic steam trap

A

Ball and float. Rises with condensate level. Thermostatic element opens air vent

24
Q

Inverted bucket steam trap

A

Steam flows into an inverted bucket and holds bucket up and closes discharge. When condenses bucket falls and opens discharge.

25
Q

Blowdown or blowback

A

Drop in pressure that closes safety valve. Normally 2 to 8 lbs below popping pressure but not more than 4%

26
Q

When are extra heavy blowdown pipes needed?

A

Above 125psi

27
Q

Safety valve pipe requirements

A

3/4” minimum and 4 1/2” max pipe size

28
Q

Impulse steam trap

A

Works on pressure differential

29
Q

Thermostatic steam trap

A

Bellows filled with fluid that expands and contracts

30
Q

Safety valve relieving capability

A

Must relieve enough pressure to allow boiler to not exceed 6% of the mawp

31
Q

Hydrostatic test

A

Pressure brought up to 1.5 times the mawp. Water temp at least 70F

32
Q

Thermoexpansion feedwater regulator

A

Thermostat attached to mechanical linkage.

33
Q

Thermohydraulic feedwater regulator

A

Tube within a tube. Inner tube connected to water and steam side of boiler. Outer tube filled with distiller water and connected to bellows and valve.

34
Q

MAWP=

A

Tensile strength x metal thickness x joint eff. / safety factor x radius of drum in inches

35
Q

Two or more safety valves needed if

A

Over 500 sqft heating surface equipped with superheaters one is not of sufficient capacity or if mawp is lowered by inspector

36
Q

1 gallon of water=lbs

A

8.33 lbs

37
Q

1 gallon = cubic inches

A

231

38
Q

A therm =

A

100,000 btu

39
Q

Matt

A

Mixture atomization temp time. All needed for complete combustion

40
Q

Gpms of recip pump

A

Lane/231

41
Q

Bituminous coal

A

Soft coal high volatile matter

42
Q

Pressure atomizing burner

A

Fuel oil burner atomizes fuel without using steam or air. Uses mechanical. Tip and plate.

43
Q

Sulfur dioxide

A

Byproduct of high sulfur content coal.

44
Q

Specific gravity

A

Ratio of any volume of fuel oil @ 60F to the weight of any equal volume of water @ 60F. Measured by a hydrometer.

45
Q

Stoker

A

Mechanical coal feeder

46
Q

Ultimate analysis

A

NOCASH

47
Q

Pressure reducing governor

A

Low pressure gas systems. Reduces to 0lbs

48
Q

Carbon dioxide

A

Co2. Not so bad. What plants breath. Byproduct of complete combustion

49
Q

Carbon monoxide

A

Co. Byproduct of incomplete combustion. Very bad. Not all fuel burned

50
Q

Steam atomizing burner

A

Uses steam at a pressure above 20psi or higher to atomize fuel

51
Q

1” mecury = psi

A

.491

52
Q

Anthracite coal

A

Hard coal very high carbon content

Stationary engineering (5 decks)

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