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Plumber Period 2 > Section 4 060204a-h > Flashcards

Section 4 060204a-h Flashcards

(69 cards)

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1
Q

What are the two types of copper for med gas piping

A

Type k
Type l

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2
Q

What is the minimum size of copper pipe for med gas

A

1/2”

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3
Q

What must med gas pipe be free of to prevent explosion or fire

A

Oil and grease

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4
Q

What method is used to join med gas piping

A

Brazing

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5
Q

What gas must be present when brazing med gas

A

Nitrogen

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6
Q

What are the approved cleaning materials for degreasing med gas materials

A

Trisodium phosphate and sodium carbonate

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7
Q

What is the minimum test pressure for med gas systems

A

150 psi
1030 kpa

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8
Q

What is the max test pressure for med gas vacuum systems

A

415 kpa
60 psi

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9
Q

What is used to complete a cross-connection test

A

Oil free dry air
Oil free nitrogen

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10
Q

Every system must be tested at every _____________.

A

Terminal unit

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11
Q

What are the color codes for oxygen

A

Green with white background

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12
Q

What are the color codes for nitrogen

A

White with black background

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13
Q

What is the advantage of hot tapping

A

Permits the connection of branch piping without the disruption of system pressure

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14
Q

What kind of valves are used in hot tapping operations

A

Full port

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15
Q

Where is the bleed valve attached to

A

Valve adapter

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16
Q

What should you do before doing a hot tap

A

Make sure you have enough CO2

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17
Q

How far away from the repair point should freeze jacket be

A

400mm (16”)

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18
Q

Compressors that have diaphragms are _________________ and are used in ____________________ applications

A

Reciprocating, clean air.

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19
Q

What is the tank used to store air called

A

Receiver

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20
Q

Compressed air may have impurities such as

A

Moisture, oil, and dust

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21
Q

What cools the air between stages of a two-stage compressor

A

Intercooler

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22
Q

Where are air dryers installed

A

Downstream of receiver tank

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23
Q

Pressure drop in a compressed air system should not exceed

A

5 psi

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24
Q

What should receiver tanks be equipped with

A

Safety relief, gauge, drain and pressure switch.

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25
What are unloaders used for
Limit the fluctuations
26
Most compressors are _____________________ driven.
Belt
27
Materials used for compressed air systems are generally
Black iron and sometimes copper
28
Pre-filters are installed at the
Suction inlet
29
What is another name for piston type compressors
Reciprocating
30
Where are after coolers installed
Between the compressor and the receiver
31
What is the primary unit in a compressed air system
The compressor
32
Where should the air intake be installed
Coolest location possible
33
What joining method Is used for piping larger than 2"
Welded
34
What is an FRL
Filter, regulator, and lubricator.
35
How often should plastic pipe be identified
Every 1.5 meters
36
Can you use pipe without identification
NO
37
SDR is a relationship between
Wall thickness and outside diameter
38
What is schedule number
Plastic pipe referenced to the same ID and OD as iron pipe
39
What type of PVC is used for DWV
Type 3
40
Why is steel pipe lined
To prevent corrosion and erosion
41
What type of plastic pipe is most commonly used in the gas industry
PE (polyethylene)
42
How is PE pipe joined
Fusion, compression, insert fittings with clamps
43
What is the purpose of catalyst
Minipulate the curing process
44
What is the purpose of promoters
Manipulate the curing time
45
What is the purpose of accelerator
Manipulate the start time of the project
46
What is the purpose of thickener
Fill low spots in pipe and thicken resin
47
What sizes are available for FRP pipe
1/2" to 144"
48
What are the 4 methods of FRP piping systems
O-ring bell and spigot Threaded Flanged MJ's
49
Why is cast iron so brittle
High carbon content
50
What 2 forms of carbon are added to cast iron
Graphite flakes and chemically dissolved
51
How is cast iron soil pipe coated to prevent corrosion
Inside and out with bitumen
52
What is the typical pressure rating of ductile cast iron
350 psi but can exceed 1000 psi
53
What is the only acid that attacks glass pipe
Hydroflauric acid
54
What should MJ clamps be torqued to?
55-60 inch pounds
55
What are the 3 types of corrosion typical in the piping industry
Chemical Physical Electrochemical
56
What are non-ferrous alloys
Metals that do not contain significant amounts of iron
57
What is a ferrous alloy
Has at least 50% of iron (main component)
58
What are common types of ferrous pipes
Carbon steel pipe Stainless steel pipes Alloy steel pipes Ductile iron pipes Cast iron pipes Galvanized steel pipes
59
What are common types of non-ferrous pipes
Aluminum alloys Copper alloys Nickel alloys Titanium alloys Magnesium alloys Zinc alloys Lead alloys
60
What is the Delta P for pneumatic systems
15 psi
61
What is the pressure relief usually set to
10 psi above cut out
62
Why and where are pre-filters/air-cleaners installed
On the suction inlet to the compressor to ensure a dust free clean air supply
63
Where are oil separators installed
Between the compressor and the receiver
64
What do after coolers do
Bring the temperature of the compressed air down to ambient temperatures making the system more efficient
65
What is the purpose of intercoolers
Cool the compressor air by 10° f between the cylinder stages
66
What are unloaders for
Limit the pressures according to fluctuations in demand
67
What is the minimum type of copper for med gas
Type L
68
What should med gas be pressure tested to when using cross-connection testing
150 psi or 1.5 times operating pressure whichever Is bigger
69
What is the joining method for HDPE pipe
Fusion

Plumber Period 2 (5 decks)

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