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Millwright Third Year 2018 > Insulation > Flashcards

Insulation Flashcards

1
Q

What three (3) ways can heat be transferred?

A
  • Conduction
  • Convection
  • Radiation
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2
Q

What are some purposes of insulation?

A

Keeps thing warm, or cool, which increases efficiency. It also protects damage due to exposure due to heat, or corrosive atmospheres. Another common application is to prevent water condensation on cold surfaces.

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3
Q

What is another application for insulation?

A

Sound proofing.

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4
Q

What are the three insulation categories?

A

Cryogenic (below -10 1°C) Thermal (between -10 1°C to 815°C) Refractory (above 815°C)

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5
Q

What is cryogenic insulation?

A

It is used in the temperature range of -101 down to absolute zero. Cryogenics often is used to keep liquefied gasses in the liquid state.

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6
Q

How are containers for cryogenics constructed?

A

In an insulated material to withstand extremely low temperatures without losing their strength. Usually a container inside a container similar to a thermos.

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7
Q

What is cellular glass?

A

It is a common cryogenic range insulation. It is light weight rigid material made up of millions of completely sealed glass cells and each one in an isolated space. It is extremely abrasive.

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8
Q

What is super insulation?

A

The term applied to insulating blankets developed for spaceflight. The blanket consists of approximately 50 to 100 layers per inch of aluminized mylar separated by thin air spaces.

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9
Q

Describe thermal insulation?

A

Most common type of insulation, there are three subcategories of thermal insulation- low temp, intermediate temp, high temp Typical materials are fiberglass, rock wool, foamed plastics.

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10
Q

What is effectively used in insulating building materials?

A

Small air pockets in the material greatly increase its insulation.

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11
Q

What are the three thermal insulation categories?

A
  • Fibrous
  • Cellular
  • Granular
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12
Q

Describe fibrous insulation?

A

Made from long small diameter fibers that divide the air into many tiny compartments. Fiberglass and mineral wool are commonly used.

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13
Q

Describes cellular insulation?

A

Use the principle of dividing the air pockets into tiny compartments. Foamed in plastics such as polystyrene and polyurethane are common.

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14
Q

What is granular insulation?

A

It is a loose horrible material such as vermiculite. Is commonly is used to fill the void inside hollow brick walls.

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15
Q

Define Refractory insulation?

A

Typical applications are steel foundries and cement and lime kilns.

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16
Q

What are the different forms of refractory insulation available?

A
  • Castable
  • Standard And Specially Shaped Bricks
  • Gunnite Mixes
  • Ramming Mixes
17
Q

What is a castable refractory

A

Made of minerals that withstand high temperature in the way they form ceramic, glass, or crystalline bond with manufactured.

18
Q

What are refractory bricks?

A

They are used to line the surface of a kiln. The bricks are non conducting, and thick enough to keep the steel shell from becoming red hot and warping

19
Q

What is gunnite?

A

It is mixed to a specific consistency, similar to mixing concrete, and is then sprayed onto the surface

20
Q

What is a ramming mix?

A

Has the consistency of thick plasticine. These mixes are used mainly for patching and for filling in small areas where it is too difficult to cut bricks to match.

21
Q

What things are considered when selecting insulation

A
  • Thermal Properties,
  • Mechanical Properties
  • Chemical Properties
22
Q

What is temperature conductivity?

A

Thermal conductivity is similar to thermal conductance except that conductivity is rated on a 1 inch thick section of insulation. It is known as the K value. The lower the number the better the K factor is

23
Q

What is thermal resistance?

A

It is the resistance to flow through a unit of area. It is known as the R value, and the higher the number, the better.

24
Q

Define insulation?

A

Any material that is a poor conductor of heat or electricity that is used to stop or slow down the flow of heat or electricity.

25
Q

Prolonged noise over ___db is not considered safe

A

70 db

26
Q

What are some methods of sound control?

A

Moveable curtains can reduce noise by 25db Curtains with core acoustic insulation.

27
Q

What is cladding?

A

Also called jacketing. Protects the insulation from moisture and in some cases UV rays

28
Q

What are some materials for cladding?

 *not important just for reference*
A
  • Aluminum sheeting
  • Stainless steel for sheeting
  • PVC
  • Woven tape
  • Cloth sheets
  • Plastic
  • Foil laminates
  • Roofing felt
29
Q

As much as 98% of insulation problems are related to_____

A

Moisture

30
Q

What is the purpose of a moisture barrier?

A

Prevents condensation from getting into the insulation. It is always put on the warm side of the insulation.

Millwright Third Year 2018 (15 decks)

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