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Millwright Manual > Chapter 14 - Seals > Flashcards

Chapter 14 - Seals Flashcards

1
Q

Describe :

- static seals

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2
Q

Describe :

- dynamic seals

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3
Q

Describe :

- positive seals

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4
Q

Describe :

- non-positive seals

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5
Q

How are two mating surfaces sealed without additional material?

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6
Q

What are the applications for gaskets?

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7
Q

What forces are the gasket and bolts subject to in pressure sealing applications?

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8
Q

Why is the gaskets thickness important when a replacement is required?

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9
Q

List gasket and flange arrangements

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10
Q

Describe how gasket material made to conform to flange surfaces

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11
Q

What are the prerequisites for gasket materials?

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12
Q

Compare the applications for non-metallic and metallic gaskets

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13
Q

List the materials used in non-metallic and metallic gaskets

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14
Q

What shapes are metallic gaskets?

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15
Q

Why are ring gaskets preferred over full-face gaskets on flanged?

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16
Q

Describe the procedures used to make new gaskets

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17
Q

What should be done before installing a new gasket?

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18
Q

What bolt tightening procedures should be complied with while installing a new gasket?

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19
Q

What type of sealing applications do O-rings perform?

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20
Q

How much does and O-ring change position of a part?

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21
Q

What materials are O-rings made from?

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22
Q

What O-ring cross-sectional shapes are used in hydraulics?

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23
Q

What are the applications for sealants?

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24
Q

Briefly describe non-hardening sealants, hardening sealants, and tapes

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25
Q

What are the two main categories of dynamic seals?

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26
Q

What are the applications for non-positive seal and positive seal packing?

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27
Q

Define inside-packed and outside-packed

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28
Q

Compare hard packing to soft packing

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29
Q

How is leakage controlled with compression packing?

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30
Q

What classes of materials are compression packing made from?

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31
Q

What cross-sectional shapes are compression packing?

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32
Q

What makes compression packing and/or die-moulded rings self-lubricating at start-up?

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33
Q

Describe the construction of a lantern ring

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34
Q

What are the purposes of lantern rings?

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35
Q

What are the sources of fluid supplied to the lantern rings?

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36
Q

What causes compression packing to deteriorate?

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37
Q

How is the pump prepared for compression packing replacement?

A

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38
Q

Describe how to remove old packing and confirm or calculate the correct materials for replacement

A

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39
Q

What checks are needed to confirm condition of the stuffing box and lantern ring?

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40
Q

Describe how to cut the new packing

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41
Q

Describe how to install the new packing

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42
Q

Describe the procedure for adjusting the gland to permit the correct leakage for lubrication

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43
Q

Describe the operating principle of automatic packing

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44
Q

Why is V-ring packing considered balanced and cup packing considered unbalanced?

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45
Q

What are the purposes of internal and external adapters?

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46
Q

describe the installation of chevron packing and the various methods of tightening it

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47
Q

Describe the construction and installation of U-ring and cup packing

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48
Q

Describe how O-rings and their grooves and back-up washers control leakage on both low and high pressure conditions

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49
Q

Describe the O-ring installation procedure

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50
Q

Are piston rings a positive seal?

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51
Q

What are the advantages and disadvantages of floating packing compared to synthetic seals?

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52
Q

Describe the construction and principles of operation of a lip seal

A

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53
Q

Describe the applications for a single lip seal

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54
Q

What are the applications for double lip seals?

A

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55
Q

Describe the procedure for installing a lip seal in the housing and sliding a shaft into it

A

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56
Q

What emergency repairs can be made to correct a leaking seal caused by wear on the shaft?

A

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57
Q

Describe the construction of and applications for ring seals?

A

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58
Q

Describe the purpose and operation of a wiper

A

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59
Q

What types of seals are the following and what are their applications:
- boots and bellow seals?

A

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60
Q

What types of seals are the following and what are their applications:
- diaphragm seals?

A

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61
Q

What types of seals are the following and what are their applications:
- rolling diaphragm seals?

A

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62
Q

What is the efficiency of a mechanical seal?

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63
Q

Describe the operating principles of mechanical seals

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64
Q

How is flushing achieved with mechanical seals?

A

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65
Q

What are the advantages of flushing versus not quenching?

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66
Q

How is quenching achieved with mechanical seals?

A

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67
Q

What are the advantages of quenching versus not quenching?

A

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68
Q

Is it good mechanics to mix old and new seal parts for installation?

A

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69
Q

How are repairs made to seal faces?

A

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70
Q

How should mechanical seals be handled?

A

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71
Q

Describe the following clearance seals:

- bushings

A

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72
Q

Describe the following clearance seals:

- annulus seals

A

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73
Q

Describe the following clearance seals:

- slinger (flinger) seals

A

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74
Q

Describe the following clearance seals:

- labyrinth seals

A

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Millwright Manual (24 decks)

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