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Simple machines millwright level 2 formulas > seals level 2 > Flashcards

seals level 2 Flashcards

Seals

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1
Q

7Static seal

A

No relative motion

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2
Q

Dynamic

A

Seal between moving and stationary parts (eg packing

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3
Q

Two types of flange blind

A

Pancake and spectical

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4
Q

Purging

A

Displace potential hazzerd substance with substance that is non hazzerdith

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5
Q

Fully confined

A

4 sides trapped tounge and groove.

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6
Q

unconfined

A

2 sides squeezed allows gasket two move freely towards or away

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7
Q

Partial confined

A

3 sides prevents blow out confined on 2 flat sides and edge

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8
Q

Two finishes on a flange

A

Smooth or serated

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9
Q

What is harder flange or gasket on a metallic gasket

A

Flange the gasket has to be able to form.

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10
Q

Witch flange face is for higher pressure

A

1/4” pressure above 900

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11
Q

What holds tounge and Grove gasket in place

A

The flange (fully confined 4 sides)

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12
Q

5 requirements of gasket

A

1.Bolt load
2.Pressure and temp extremes
3.fluid compatability
4.compattabilty of flange and joint design
5.with stand ware

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13
Q

Replace gasket with

A

Same gasket could test fit to see if this essay stays correct or need to use thicker one .

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14
Q

Aerobic vs anerobic

A

Aerobic become hard in presence of air.
Anaerobic absence of air.

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15
Q

Mechanical leak is how much and called what

A

5 drops /hour
Called lubrication.

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16
Q

Can a mechanical seal be adjusted to stop a leak.

A

No when it fails it fails completely. This is why they cannot be used for fire safty.

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17
Q

Items used as primary seal faces of mechanical seal

A

Ceramics and carbon are main ones for water

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18
Q

Secondary seal on mechanical seal

A

Square/gasket packing
V-packing
U-cups
Delta rings
O-rings

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19
Q

Orientation of mechanical seal faces to shaft center line

A

Always perpendicular

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20
Q

When used with shaft sleeve how many sealing points

A

5

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21
Q

Why do gas seal have grooves

A

To separate matting surface and reduce ware

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22
Q

Disadvantages of ptfe wedge as secondary seal

A

Requires heavy seal force that can cause overheating

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23
Q

Suction =

A

Change in atmospheric pressure

24
Q

Advantage of v-ring as secondary seal

A

Can be turned around to seal in vacuum situations

25
Q

Non pusher reqiures

A

A push to keep seal faces together no pusher =static

26
Q

Pusher seal =

A

Dynamic

27
Q

Flushing vs quench

A

Flushing is rinsed
Queched is cleaned

28
Q

Single mechanical seal can be installed

A

Either inside or outside mounted they have one primary sealing point.

29
Q

Double mechanical seal

A

Two seals with two rotating seals that face in opposite direction

30
Q

Purpose of barrier liquid in back to back seal arrangement

A

Lubricate
Form a barrier to isolate pumping medium from seals and atmosphere.

31
Q

Seals face what way in tandem seal arrangement

A

Seal face away from product

32
Q

External seal is

A

Seal on bearing housing (pillow block)

33
Q

Intregal seal

A

Seal attached to bearing has to be prelubricated (also called a shild)

34
Q

A rubbing seal is required too

A

Contact to shaft also
Capable of retaining oil
Positive seal against moisture and fine contaminants.

35
Q

Positive seal

A

Seal that prevents any fluid from leaking from one side to another

36
Q

What shaft imperfections contribute too lip seal leaks

A

Burrs and deposits grit.

37
Q

Lip seal direction

A

Inclusion seal in

Exclusion keep dirt out

38
Q

What must be done to felt ring before installing

A

Must be soaked in oil

39
Q

Operation of spiral groove seal

A

Overcome disadvantage of non contact seal by acting as a flinger to keep containment away from important parts

40
Q

Labyrinth defined as

A

A torturous path

41
Q

If lantern ring is used to keep harmful abrasives and chemicals out it is located.

A

6 o’clock or at bottom

42
Q

Standard o ring psi _
And with anti extrusion rings _ psi

A

1500- 3000

43
Q

O ring fully confined psi eg b fitting

A

10,000 psi

44
Q

O ring Grove width

A

120-150 percent

45
Q

O ring squeeze static and dynamic

A

Static 20 percent
Dynamic 10 percent
Less because it’s moving want less ware

46
Q

O ring depth of Groove dictates…

A

The o ring squeeze

47
Q

Secondary seal in machanical seal is

A

Static

48
Q

Primary seal in mechanical seal is

A

Dynamic

49
Q

What psi must lantern ring receive to keep pumping medium away from packing

A

10-15 psi

50
Q

Positive seals used when it is vital that no atmospheric containment reach working parts

A

Boots and bellows

51
Q

Lip seal psi

A

2-10 psi

52
Q

Gasket to be careful of for special applications like steam turbine

A

Asbestos

53
Q

all static seals are

A

Positive

54
Q

Seals that control amount of leak

A

Non positive

55
Q

Positive seals

A

Prevent leak

56
Q

Seals between stationary parts

A

Static

57
Q

Seals between moving and stationary part

A

Dynamic

Simple machines millwright level 2 formulas (5 decks)

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