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Cladding and Lagging Flashcards

1
Q

Rolls of stainless steel cladding can be ordered with what type of finish?

A

Stucco embossed, smooth, and 3/16 corrugated

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2
Q

What should the circumferential and horizontal lap be when covering pipe insulation with aluminum?

A

2” (50mm)

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3
Q

The lap for aluminum cladding on a horizontal pipe is usually placed away from prevailing winds at?

A

2 o’clock

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4
Q

Why are moisture barriers applied to aluminum?

A

To provide protection against corrosion

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5
Q

Stainless steel cladding can be used in place of aluminum for what purpose?

A

For chemical and fire resistance

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6
Q

On insulated tanks where excessive expansion and contraction takes place, what should the aluminum be fastened with?

A

Stainless steel bands and expansion springs

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7
Q

When installing corrugated sheets on a vertical tower, what should be used to permanently prevent the sheets from sliding down?

A

S clips

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8
Q

What measurements are required for the layout of a bevel?

A

OD of pipe, OD of insulation, crimp

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9
Q

In order to lay out aluminum bevels with a square , which dimensions would be placed onto the square?

A

One half of the outside diameter of the pipe, one half of the O.D. of the Pipe insulation and the amount of crimp.

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10
Q

When laying out a gore pattern for a 90 degree elbow, in order to have sixteen equal divisions on a stretch-out, the half circle drawn must be divided into how many divisions?

A

8

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11
Q

What layout method is used to layout a gore pattern?

A

Parallel line development

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12
Q

What is the primary reason for caulking any type of cladding?

A

To prevent water from getting into the insulation

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13
Q

The terms cladding, lagging, and jacketing all have the same meaning and can be used interchangeably. True or False?

A

True

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14
Q

What is the primary purpose for cladding or lagging any object?

A

To protect the insulation beneath it

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15
Q

What are all the methods used for material protection?

A

Weatherproofing, fireproofing, chemical resistance, and soundproofing.

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16
Q

How does insulation lose its insulating properties?

A

If it is wet, contaminated, or missing

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17
Q

When is stainless steel jacketing used?

A

To protect the piping or equipment from high temperatures that may result in the event of a fire.

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18
Q

Some chemicals and acids are?

A

Corrosive

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19
Q

What is used in cladding material that is designed to reduce the noise levels of underlying components and help muffle sound?

A

An additional rubber liner

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20
Q

What steel is the most common for banding?

A

Stainless Steel

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21
Q

Who will take into consideration the environment in which the material will be installed as well as things like material availability, cost and appearance?

A

The engineer

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22
Q

What material types are used for cladding and lagging?

A

Aluminum, stainless steel, galvanized iron, moisture barriers, muffle jackets, and pressed elbows

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23
Q

What is the most common cladding material?

A

Aluminum

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24
Q

What are the advantages to using aluminum in cladding and lagging?

A

Lightweight, easily cut and formed, relatively inexpensive, and readily available in preformed pieces

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25
What are the disadvantages to using aluminum in cladding and lagging?
Low strength (easily scratched or dented), not very chemical resistant (especially acids and lime), and not fireproof (melts at low temperatures)
26
Where is stainless steel mostly used in cladding and lagging?
In specialty applications such as in the petro chemical industry
27
What are the advantages to using stainless steel?
Extremely strong (not easily scratched or dented), highly chemical resistant, fire resistant (melts at high temperatures) and clean and attractive in appearance
28
What are the disadvantages to using stainless steel?
Very expensive and difficult to cut and form
29
What material is not commonly used in cladding and lagging?
Galvanized iron
30
What are the advantages to using galvanized iron?
Strong, (significantly stronger than aluminum), somewhat chemical and fire resistant (melts at a higher temperature than aluminum), easy to cut and form, and inexpensive.
31
What are the disadvantages to using galvanized iron?
Subject to rusting if scratched, non-resistant to acids, and low quality in appearance (dull finish that deteriorates with age)
32
What is the purpose of moisture barriers?
To prevent chemical attack at the metal insulation interface.
33
What is a muffle jacket?
A cladding material that has an inside rubber liner added to lower sound levels.
34
Pressed elbows fit nominal pipers ranging in which sizes?
1" ti 36" inside pipe size (IPS)
35
What is the most common finish used in cladding and lagging?
A smooth finish
36
What is the disadvantage of using a smooth finish?
It is highly susceptible to scratching and denting
37
What is the advantage of using a corrugated finish instead of a smooth finish?
They are stronger and more scratch/dent resistant than the smooth finish.
38
What are corrugated sheets usually used for?
To protect equipment and insulation in abusive areas.
39
What finish is not commonly used in cladding and lagging?
Corrolon
40
What is the advantage of using a corrolon finish?
It is the strongest and therefore the most scratch/dent/resistant of all the finishes.
41
Which finish in cladding and lagging has a rough, bumpy appearance, which adds to its ability to resist scratching and denting?
Stucco embossed finish
42
When are gore elbows mainly used in cladding and lagging?
On large mitered elbows, sweeps, or where it is difficult or impractical for you to use pressed elbows.
43
What is the advantage of using pressed elbows in cladding and lagging?
You are able to fabricate the elbows in a shop off-site
44
What is the disadvantage of using pressed elbows in cladding and lagging?
They take longer to install than pressed elbows.
45
What are the two main types of end caps used in cladding and lagging?
The crimp type end cap and the lock form type end cap
46
What do you use in cladding and lagging when you cut the insulation back at a 45 degree angle to accommodate the removal of bolts on flanges or valves, or to allow access to equipment?
You use metal bevels to cover the ends of the insulation
47
What are used to support the banding between the sheets used in cladding and lagging and to prevent them from sliding to become uneven?
Tear drops
48
What is used on piping or equipment in order to fasten the cladding to the insulation?
Banding
49
What are used with banding in cladding lagging?
Clips
50
What widths and styles do the the clips typically come in when used with banding in cladding and lagging?
1/2" to 3/4" widths, and come in the wing seal type or the crimp type.
51
What are used to accommodate the expansion and contraction of large diameter pipes, tanks, vessels, heat exchangers and equipment?
Expansion springs
52
Expansion springs are used with any common width of banding at a maximum of one spring for every ___ of banding?
50 ft. (15m) of banding
53
What are permanent mechanical fasteners made from either stainless steel or aluminum?
Pop rivets
54
What is a better fastener to use in cladding and lagging and why? Rivets or Screws?
Rivets because screws have a tendency to vibrate and loosen over time.
55
How do you prevent galvanic action?
Use screws made from the same material as the cladding material.
56
What type of screws are normally used for cladding and lagging?
Robertson screws
57
When figuring out the recommended thickness for material in cladding and lagging, what is important to remember?
The thicker the metal, the thicker the gauge
58
All laps on material must be a minimum of ___ when cladding piping and a minimum of ___ when cladding equipment.
2" (50 mm) when cladding piping, 3" (75 mm) when cladding equipment
59
When using cladding techniques, you should always keep in mind what 3 important factors?
Managing watershed, weatherproofing, and using proper flashing
60
When you are finishing cladding, it is crucial that you?
Apply sufficient amounts of caulking to seal out weather and contaminants.
61
All vertical piping should overlap one another by at least?
2" (50 mm)
62
What sheets are designed to protect and weatherproof equipment such as vessels and tanks?
Corrugated sheets
63
Where must you install bevels?
At bolt length, plus 1" away from all removable objects.
64
What are used to cover insulation where the insulation ends?
End caps
65
What should you always allow for when an end cap is going over the metal in a vertical riser?
Watershed
66
What seam should always be used when cladding and lagging for weather proofing?
Pittsburgh seam
67
What tool allows you lap and tighten the banding material in cladding and lagging?
A metal banding tool
68
All banding clips should be placed on what side of the pipe for a neat appearance?
Should be placed on the concealed side of the pipe
69
When referring to pipe sized in cladding and lagging, they refer to the ___ diameter of the pipe. This dimension is also known as what?
Inside diameter of the pipe and is known as the callout size.
70
What is a common method used for laying out the pattern for a bevel?
The square method
71
When laying out a bevel using the square method, what 3 pieces of info do you need?
The outside diameter of the pipe, the outside diameter of the insulation, and the amount of crimp
72
What end cap is generally used on larger projects where more stability is required?
The lock formed end cap
73
For the gore elbows used in cladding and lagging, What should the gore end lap be for diameters up to and including 8"?
2" (50 mm)
74
For the gore elbows used in cladding and lagging, What should the gore end lap be for diameters larger than 8"?
4" (100 mm)
75
For the gore elbows used in cladding and lagging, What should the gore total side lap be for diameters up to and including 8"?
1/2" (12mm)
76
For the gore elbows used in cladding and lagging, What should the gore total side lap be for diameters larger than 8"?
1" (25 mm)
77
What is the typical spacing for screws in cladding and lagging?
4"
78
What is an important technique when cladding and lagging to avoid water shed?
Start from the bottom and work your way up.

Custom Metal Fabrication (4 decks)

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