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Process Tech 3 > Test2 > Flashcards

Test2 Flashcards

1
Q

Provided at utility stations throughout the plant for operation of plant equipment and tools

A

service air

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2
Q

used in maintenance shops

A

shop air

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3
Q

service air that has been dried to a low dew point to prevent freezing of the equipment starter.

A

starting air

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4
Q

What does a plant air system consist of?

A

Compressor, Knockout drum, Air Dryers, Moisture analyzer, Nitrogen pipeline.

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5
Q

Compressor has what 2 types of systems?

A

Lube and oil, which cools and lubricates compressor. & Cooling water system, which cools the compressed air.

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6
Q

What does the knockout drum do?

A

remove moisture and oil

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7
Q

What does the air dryer do?

A

removes the remaining moisture, air must be very dry.

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8
Q

What does moisture analyzer do?

A

Measures air dew point. Dewpoint is kept around -40 to -70 degrees F

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9
Q

What is the purpose of the nitrogen

A

Maintains header pressure.

Available if there is a malfunction in air system**

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10
Q

how does instrument air differ from plant air

A

it is pressured and dried 105 psig

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11
Q

instrument air is used to

A

operate pneumatic instruments and controllers, drive equipment (pumps or drills), transport material (pneumatic conveying), purge equipment, and dry solids.

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12
Q

T or F

instrument air uses the same compressor as pant air

A

true

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13
Q

It is critical that what kind of air is always available?

A

Instrument air

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14
Q

Instrument air must be free of what?

and why

A

dust, particulates, moisture, hydrocarbons, and other contaminants.
because it will prevent damage to instruments.

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15
Q

What removes condensation?

A

O pots, air dryers, and water traps

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16
Q

Instrument air must be what

A

very dry

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17
Q

What is used as a backup in case dryer or compressor fails

A

nitrogen

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18
Q

Plant air operates around what psig

A

125 psig

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19
Q

Plant air can cause

A

injury to personnel or damage equipment. whipping hose, or flying debris

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20
Q

why cant nitrogen be used as a gas?

A

Because it displaces oxygen and can kill you easily

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21
Q

what is off gas?

A

off gas comes from the process (free) vs. natural gas which has supplements added to it.

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22
Q

What is natural gas?

A

chemicaaly known as methane (NOT PURE METHANE)

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23
Q

what are the 2 categories of natural gas?

A

Low Sulfur-Sweet natural gas, & High Sulfur-Sour Natural Gas

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24
Q

Tech Responsibility:

A

monitoring both pressure of the receiver and the flow leaving the receiver.
Monitor liquid levels in knockout and surge drums
Change line and vessel filters
Operate and monitor scrubbers
Test system for leaks

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25
Q

Saftey:

A

Highly Flammable (natural gas), serious safety issue,

26
Q

Fuel for burners can come from

A

naturaal gas, oil, coal, or fuel gas.

27
Q

Fuel gas is what?

A

Offgas and natural gas mixed together.

28
Q

Fuel samples are usually collected in what?

A

Tedlar bag

29
Q

Saftey: Fuel gas:

A

may contain H2S(Hydrogen Sulfide), is highly combustible.

safety feature is DB&B double block & bleed system.

30
Q

steam generator

A

two sections ; the boiler and furnace.

31
Q

fire tub boiler

A

fire or heat is applied to the inside of the tube while the water is circulated on the outside.

32
Q

water tube boiler

A

water is inside the tube and fire on the outside

33
Q

steam drum

A

Central piece of equipment
BFW enters
Gets steam from risers

34
Q

mud drum

A

where impurities concentrate, blow down removes sediment

35
Q

Blow down

A

Gets rid of suspended solids

36
Q

SWELL

A

Steam demand instantly increases causing increase in steam drum level

37
Q

Shrink

A

Steam demand instantly decreases, causing decrease in steam drum level

38
Q

6 stages of water treatment

A
  1. Clarification
  2. Sedimentation
  3. Filtration
  4. Ion hardness
  5. Deaeration
  6. Adding one or more conditioning agents
39
Q

What is added to boiler to maintain correct PH

A

Caustic

40
Q

A steam distribution system is what kind of Loop

A

Closed loop

41
Q

Steam that has had some heat energy removed

A

Condensate

42
Q

Heat required is called

A

Latent heat

43
Q

Type of heat that can be sensed and measured

A

Sensible heat

44
Q

Bubbles in boiling water is a form of steam known as

A

Saturated steam

45
Q

Steam exiting at a higher temperature than it’s saturation temperature is called

A

Super heated steam

46
Q

High pressure

A

600+ psig

47
Q

Medium pressure

A

200-600 psig

48
Q

Low pressure

A

15-200 psig

49
Q

Stations that have a valve and or injection of water or lower pressure steam

A

Letdown stations

50
Q

Why do we have expansion loops

A

Because the allow for expansion and contraction of piping

51
Q

Why do we recapture condensate?

A

It’s pure and you use less fuel converting it back to steam. It is also already treated. It’s the best economic choose for boiler feed water.

52
Q

Economize

A

Like a preheater

53
Q

Fire box

A

WHERE flame is

54
Q

Burner

A

Can be on side walk or Floor

55
Q

Tubes

A

Can be hanging many different ways

56
Q

What kind of pressure is in firebox

A

Negative. .05 in of water. Don’t want stuff to flare out.

57
Q

Saturated steam

A

Just recently boiled

58
Q

Superheated steam

A

Had more energy added to it

59
Q

What is used to catch condensate

A

Steam traps

60
Q

What is used to get condensate out if it gets suck

A

Water hammer.

61
Q

What puts film down on metal so that water can’t touch it

A

Passivator

62
Q

What eats or reacts to make neutral

A

Scavenger

Process Tech 3 (3 decks)

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