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Millwright Manual > Chapter 14 - Seals > Flashcards

Chapter 14 - Seals Flashcards

1
Q

Describe :

- static seals

A

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2
Q

Describe :

- dynamic seals

A

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3
Q

Describe :

- positive seals

A

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4
Q

Describe :

- non-positive seals

A

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5
Q

How are two mating surfaces sealed without additional material?

A

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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?

A

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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

A

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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?

A

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15
Q

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

A

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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?

A

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19
Q

What type of sealing applications do O-rings perform?

A

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20
Q

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

A

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21
Q

What materials are O-rings made from?

A

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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?

A

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24
Q

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

A

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25
Q

What are the two main categories of dynamic seals?

A

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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

A

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29
Q

How is leakage controlled with compression packing?

A

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30
Q

What classes of materials are compression packing made from?

31
Q

What cross-sectional shapes are compression packing?

32
Q

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

33
Q

Describe the construction of a lantern ring

34
Q

What are the purposes of lantern rings?

35
Q

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

36
Q

What causes compression packing to deteriorate?

37
Q

How is the pump prepared for compression packing replacement?

38
Q

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

39
Q

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

40
Q

Describe how to cut the new packing

41
Q

Describe how to install the new packing

42
Q

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

43
Q

Describe the operating principle of automatic packing

44
Q

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

45
Q

What are the purposes of internal and external adapters?

46
Q

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

47
Q

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

48
Q

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

49
Q

Describe the O-ring installation procedure

50
Q

Are piston rings a positive seal?

51
Q

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

52
Q

Describe the construction and principles of operation of a lip seal

53
Q

Describe the applications for a single lip seal

54
Q

What are the applications for double lip seals?

55
Q

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

56
Q

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

57
Q

Describe the construction of and applications for ring seals?

58
Q

Describe the purpose and operation of a wiper

59
Q

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

60
Q

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

61
Q

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

62
Q

What is the efficiency of a mechanical seal?

63
Q

Describe the operating principles of mechanical seals

64
Q

How is flushing achieved with mechanical seals?

65
Q

What are the advantages of flushing versus not quenching?

66
Q

How is quenching achieved with mechanical seals?

67
Q

What are the advantages of quenching versus not quenching?

68
Q

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

69
Q

How are repairs made to seal faces?

70
Q

How should mechanical seals be handled?

71
Q

Describe the following clearance seals:

- bushings

72
Q

Describe the following clearance seals:

- annulus seals

73
Q

Describe the following clearance seals:

- slinger (flinger) seals

74
Q

Describe the following clearance seals:

- labyrinth seals

Millwright Manual (24 decks)

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