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Flashcards in Test2 Deck (62):
1

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

service air

2

used in maintenance shops

shop air

3

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

starting air

4

What does a plant air system consist of?

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

5

Compressor has what 2 types of systems?

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

6

What does the knockout drum do?

remove moisture and oil

7

What does the air dryer do?

removes the remaining moisture, air must be very dry.

8

What does moisture analyzer do?

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

9

What is the purpose of the nitrogen

Maintains header pressure.
Available if there is a malfunction in air system**

10

how does instrument air differ from plant air

it is pressured and dried 105 psig

11

instrument air is used to

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

12

T or F
instrument air uses the same compressor as pant air

true

13

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

Instrument air

14

Instrument air must be free of what?

and why

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

15

What removes condensation?

O pots, air dryers, and water traps

16

Instrument air must be what

very dry

17

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

nitrogen

18

Plant air operates around what psig

125 psig

19

Plant air can cause

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

20

why cant nitrogen be used as a gas?

Because it displaces oxygen and can kill you easily

21

what is off gas?

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

22

What is natural gas?

chemicaaly known as methane (NOT PURE METHANE)

23

what are the 2 categories of natural gas?

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

24

Tech Responsibility:

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

25

Saftey:

Highly Flammable (natural gas), serious safety issue,

26

Fuel for burners can come from

naturaal gas, oil, coal, or fuel gas.

27

Fuel gas is what?

Offgas and natural gas mixed together.

28

Fuel samples are usually collected in what?

Tedlar bag

29

Saftey: Fuel gas:

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

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

30

steam generator

two sections ; the boiler and furnace.

31

fire tub boiler

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

32

water tube boiler

water is inside the tube and fire on the outside

33

steam drum

Central piece of equipment
BFW enters
Gets steam from risers

34

mud drum

where impurities concentrate, blow down removes sediment

35

Blow down

Gets rid of suspended solids

36

SWELL

Steam demand instantly increases causing increase in steam drum level

37

Shrink

Steam demand instantly decreases, causing decrease in steam drum level

38

6 stages of water treatment

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

39

What is added to boiler to maintain correct PH

Caustic

40

A steam distribution system is what kind of Loop

Closed loop

41

Steam that has had some heat energy removed

Condensate

42

Heat required is called

Latent heat

43

Type of heat that can be sensed and measured

Sensible heat

44

Bubbles in boiling water is a form of steam known as

Saturated steam

45

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

Super heated steam

46

High pressure

600+ psig

47

Medium pressure

200-600 psig

48

Low pressure

15-200 psig

49

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

Letdown stations

50

Why do we have expansion loops

Because the allow for expansion and contraction of piping

51

Why do we recapture condensate?

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

Economize

Like a preheater

53

Fire box

WHERE flame is

54

Burner

Can be on side walk or Floor

55

Tubes

Can be hanging many different ways

56

What kind of pressure is in firebox

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

57

Saturated steam

Just recently boiled

58

Superheated steam

Had more energy added to it

59

What is used to catch condensate

Steam traps

60

What is used to get condensate out if it gets suck

Water hammer.

61

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

Passivator

62

What eats or reacts to make neutral

Scavenger