Chapter 14 - Seals

Question 1

Describe :

- static seals

Answer 1

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Question 2

Describe :

- dynamic seals

Answer 2

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Question 3

Describe :

- positive seals

Answer 3

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Question 4

Describe :

- non-positive seals

Answer 4

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Question 5

How are two mating surfaces sealed without additional material?

Answer 5

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Question 6

What are the applications for gaskets?

Answer 6

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Question 7

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

Answer 7

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Question 8

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

Answer 8

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Question 9

List gasket and flange arrangements

Answer 9

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Question 10

Describe how gasket material made to conform to flange surfaces

Answer 10

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Question 11

What are the prerequisites for gasket materials?

Answer 11

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Question 12

Compare the applications for non-metallic and metallic gaskets

Answer 12

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Question 13

List the materials used in non-metallic and metallic gaskets

Answer 13

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Question 14

What shapes are metallic gaskets?

Answer 14

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Question 15

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

Answer 15

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Question 16

Describe the procedures used to make new gaskets

Answer 16

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Question 17

What should be done before installing a new gasket?

Answer 17

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Question 18

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

Answer 18

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Question 19

What type of sealing applications do O-rings perform?

Answer 19

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Question 20

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

Answer 20

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Question 21

What materials are O-rings made from?

Answer 21

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Question 22

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

Answer 22

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Question 23

What are the applications for sealants?

Answer 23

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Question 24

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

Answer 24

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Question 25

What are the two main categories of dynamic seals?

Answer 25

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Question 26

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

Answer 26

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Question 27

Define inside-packed and outside-packed

Answer 27

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Question 28

Compare hard packing to soft packing

Answer 28

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Question 29

How is leakage controlled with compression packing?

Answer 29

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Question 30

What classes of materials are compression packing made from?

Answer 30

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Question 31

What cross-sectional shapes are compression packing?

Answer 31

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Question 32

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

Answer 32

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Question 33

Describe the construction of a lantern ring

Answer 33

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Question 34

What are the purposes of lantern rings?

Answer 34

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Question 35

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

Answer 35

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Question 36

What causes compression packing to deteriorate?

Answer 36

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Question 37

How is the pump prepared for compression packing replacement?

Answer 37

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Question 38

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

Answer 38

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Question 39

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

Answer 39

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Question 40

Describe how to cut the new packing

Answer 40

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Question 41

Describe how to install the new packing

Answer 41

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Question 42

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

Answer 42

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Question 43

Describe the operating principle of automatic packing

Answer 43

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Question 44

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

Answer 44

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Question 45

What are the purposes of internal and external adapters?

Answer 45

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Question 46

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

Answer 46

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Question 47

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

Answer 47

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Question 48

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

Answer 48

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Question 49

Describe the O-ring installation procedure

Answer 49

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Question 50

Are piston rings a positive seal?

Answer 50

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Question 51

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

Answer 51

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Question 52

Describe the construction and principles of operation of a lip seal

Answer 52

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Question 53

Describe the applications for a single lip seal

Answer 53

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Question 54

What are the applications for double lip seals?

Answer 54

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Question 55

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

Answer 55

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Question 56

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

Answer 56

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Question 57

Describe the construction of and applications for ring seals?

Answer 57

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Question 58

Describe the purpose and operation of a wiper

Answer 58

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Question 59

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

Answer 59

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Question 60

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

Answer 60

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Question 61

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

Answer 61

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Question 62

What is the efficiency of a mechanical seal?

Answer 62

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Question 63

Describe the operating principles of mechanical seals

Answer 63

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Question 64

How is flushing achieved with mechanical seals?

Answer 64

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Question 65

What are the advantages of flushing versus not quenching?

Answer 65

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Question 66

How is quenching achieved with mechanical seals?

Answer 66

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Question 67

What are the advantages of quenching versus not quenching?

Answer 67

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Question 68

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

Answer 68

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Question 69

How are repairs made to seal faces?

Answer 69

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Question 70

How should mechanical seals be handled?

Answer 70

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Question 71

Describe the following clearance seals: | - bushings

Answer 71

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Question 72

Describe the following clearance seals: | - annulus seals

Answer 72

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Question 73

Describe the following clearance seals: | - slinger (flinger) seals

Answer 73

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Question 74

Describe the following clearance seals: | - labyrinth seals

Answer 74

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