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custom metal fabrication > Cladding and Lagging > Flashcards

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
Q

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

A

Low strength (easily scratched or dented), not very chemical resistant (especially acids and lime), and not fireproof (melts at low temperatures)

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26
Q

Where is stainless steel mostly used in cladding and lagging?

A

In specialty applications such as in the petro chemical industry

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27
Q

What are the advantages to using stainless steel?

A

Extremely strong (not easily scratched or dented), highly chemical resistant, fire resistant (melts at high temperatures) and clean and attractive in appearance

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28
Q

What are the disadvantages to using stainless steel?

A

Very expensive and difficult to cut and form

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29
Q

What material is not commonly used in cladding and lagging?

A

Galvanized iron

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30
Q

What are the advantages to using galvanized iron?

A

Strong, (significantly stronger than aluminum), somewhat chemical and fire resistant (melts at a higher temperature than aluminum), easy to cut and form, and inexpensive.

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31
Q

What are the disadvantages to using galvanized iron?

A

Subject to rusting if scratched, non-resistant to acids, and low quality in appearance (dull finish that deteriorates with age)

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32
Q

What is the purpose of moisture barriers?

A

To prevent chemical attack at the metal insulation interface.

33
Q

What is a muffle jacket?

A

A cladding material that has an inside rubber liner added to lower sound levels.

34
Q

Pressed elbows fit nominal pipers ranging in which sizes?

A

1” ti 36” inside pipe size (IPS)

35
Q

What is the most common finish used in cladding and lagging?

A

A smooth finish

36
Q

What is the disadvantage of using a smooth finish?

A

It is highly susceptible to scratching and denting

37
Q

What is the advantage of using a corrugated finish instead of a smooth finish?

A

They are stronger and more scratch/dent resistant than the smooth finish.

38
Q

What are corrugated sheets usually used for?

A

To protect equipment and insulation in abusive areas.

39
Q

What finish is not commonly used in cladding and lagging?

A

Corrolon

40
Q

What is the advantage of using a corrolon finish?

A

It is the strongest and therefore the most scratch/dent/resistant of all the finishes.

41
Q

Which finish in cladding and lagging has a rough, bumpy appearance, which adds to its ability to resist scratching and denting?

A

Stucco embossed finish

42
Q

When are gore elbows mainly used in cladding and lagging?

A

On large mitered elbows, sweeps, or where it is difficult or impractical for you to use pressed elbows.

43
Q

What is the advantage of using pressed elbows in cladding and lagging?

A

You are able to fabricate the elbows in a shop off-site

44
Q

What is the disadvantage of using pressed elbows in cladding and lagging?

A

They take longer to install than pressed elbows.

45
Q

What are the two main types of end caps used in cladding and lagging?

A

The crimp type end cap and the lock form type end cap

46
Q

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?

A

You use metal bevels to cover the ends of the insulation

47
Q

What are used to support the banding between the sheets used in cladding and lagging and to prevent them from sliding to become uneven?

A

Tear drops

48
Q

What is used on piping or equipment in order to fasten the cladding to the insulation?

A

Banding

49
Q

What are used with banding in cladding lagging?

A

Clips

50
Q

What widths and styles do the the clips typically come in when used with banding in cladding and lagging?

A

1/2” to 3/4” widths, and come in the wing seal type or the crimp type.

51
Q

What are used to accommodate the expansion and contraction of large diameter pipes, tanks, vessels, heat exchangers and equipment?

A

Expansion springs

52
Q

Expansion springs are used with any common width of banding at a maximum of one spring for every ___ of banding?

A

50 ft. (15m) of banding

53
Q

What are permanent mechanical fasteners made from either stainless steel or aluminum?

A

Pop rivets

54
Q

What is a better fastener to use in cladding and lagging and why? Rivets or Screws?

A

Rivets because screws have a tendency to vibrate and loosen over time.

55
Q

How do you prevent galvanic action?

A

Use screws made from the same material as the cladding material.

56
Q

What type of screws are normally used for cladding and lagging?

A

Robertson screws

57
Q

When figuring out the recommended thickness for material in cladding and lagging, what is important to remember?

A

The thicker the metal, the thicker the gauge

58
Q

All laps on material must be a minimum of ___ when cladding piping and a minimum of ___ when cladding equipment.

A

2” (50 mm) when cladding piping, 3” (75 mm) when cladding equipment

59
Q

When using cladding techniques, you should always keep in mind what 3 important factors?

A

Managing watershed, weatherproofing, and using proper flashing

60
Q

When you are finishing cladding, it is crucial that you?

A

Apply sufficient amounts of caulking to seal out weather and contaminants.

61
Q

All vertical piping should overlap one another by at least?

A

2” (50 mm)

62
Q

What sheets are designed to protect and weatherproof equipment such as vessels and tanks?

A

Corrugated sheets

63
Q

Where must you install bevels?

A

At bolt length, plus 1” away from all removable objects.

64
Q

What are used to cover insulation where the insulation ends?

A

End caps

65
Q

What should you always allow for when an end cap is going over the metal in a vertical riser?

A

Watershed

66
Q

What seam should always be used when cladding and lagging for weather proofing?

A

Pittsburgh seam

67
Q

What tool allows you lap and tighten the banding material in cladding and lagging?

A

A metal banding tool

68
Q

All banding clips should be placed on what side of the pipe for a neat appearance?

A

Should be placed on the concealed side of the pipe

69
Q

When referring to pipe sized in cladding and lagging, they refer to the ___ diameter of the pipe. This dimension is also known as what?

A

Inside diameter of the pipe and is known as the callout size.

70
Q

What is a common method used for laying out the pattern for a bevel?

A

The square method

71
Q

When laying out a bevel using the square method, what 3 pieces of info do you need?

A

The outside diameter of the pipe, the outside diameter of the insulation, and the amount of crimp

72
Q

What end cap is generally used on larger projects where more stability is required?

A

The lock formed end cap

73
Q

For the gore elbows used in cladding and lagging, What should the gore end lap be for diameters up to and including 8”?

A

2” (50 mm)

74
Q

For the gore elbows used in cladding and lagging, What should the gore end lap be for diameters larger than 8”?

A

4” (100 mm)

75
Q

For the gore elbows used in cladding and lagging, What should the gore total side lap be for diameters up to and including 8”?

A

1/2” (12mm)

76
Q

For the gore elbows used in cladding and lagging, What should the gore total side lap be for diameters larger than 8”?

A

1” (25 mm)

77
Q

What is the typical spacing for screws in cladding and lagging?

A

4”

78
Q

What is an important technique when cladding and lagging to avoid water shed?

A

Start from the bottom and work your way up.

custom metal fabrication (4 decks)

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