seals level 2

Question 1

7Static seal

Answer 1

No relative motion

Question 2

Dynamic

Answer 2

Seal between moving and stationary parts (eg packing

Question 3

Two types of flange blind

Answer 3

Pancake and spectical

Question 4

Purging

Answer 4

Displace potential hazzerd substance with substance that is non hazzerdith

Question 5

Fully confined

Answer 5

4 sides trapped tounge and groove.

Question 6

unconfined

Answer 6

2 sides squeezed allows gasket two move freely towards or away

Question 7

Partial confined

Answer 7

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

Question 8

Two finishes on a flange

Answer 8

Smooth or serated

Question 9

What is harder flange or gasket on a metallic gasket

Answer 9

Flange the gasket has to be able to form.

Question 10

Witch flange face is for higher pressure

Answer 10

1/4” pressure above 900

Question 11

What holds tounge and Grove gasket in place

Answer 11

The flange (fully confined 4 sides)

Question 12

5 requirements of gasket

Answer 12

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

Question 13

Replace gasket with

Answer 13

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

Question 14

Aerobic vs anerobic

Answer 14

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

Question 15

Mechanical leak is how much and called what

Answer 15

5 drops /hour
Called lubrication.

Question 16

Can a mechanical seal be adjusted to stop a leak.

Answer 16

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

Question 17

Items used as primary seal faces of mechanical seal

Answer 17

Ceramics and carbon are main ones for water

Question 18

Secondary seal on mechanical seal

Answer 18

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

Question 19

Orientation of mechanical seal faces to shaft center line

Answer 19

Always perpendicular

Question 20

When used with shaft sleeve how many sealing points

Answer 20

5

Question 21

Why do gas seal have grooves

Answer 21

To separate matting surface and reduce ware

Question 22

Disadvantages of ptfe wedge as secondary seal

Answer 22

Requires heavy seal force that can cause overheating

Question 23

Suction =

Answer 23

Change in atmospheric pressure

Question 24

Advantage of v-ring as secondary seal

Answer 24

Can be turned around to seal in vacuum situations

Question 25

Non pusher reqiures

Answer 25

A push to keep seal faces together no pusher =static

Question 26

Pusher seal =

Answer 26

Dynamic

Question 27

Flushing vs quench

Answer 27

Flushing is rinsed Queched is cleaned

Question 28

Single mechanical seal can be installed

Answer 28

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

Question 29

Double mechanical seal

Answer 29

Two seals with two rotating seals that face in opposite direction

Question 30

Purpose of barrier liquid in back to back seal arrangement

Answer 30

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

Question 31

Seals face what way in tandem seal arrangement

Answer 31

Seal face away from product

Question 32

External seal is

Answer 32

Seal on bearing housing (pillow block)

Question 33

Intregal seal

Answer 33

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

Question 34

A rubbing seal is required too

Answer 34

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

Question 35

Positive seal

Answer 35

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

Question 36

What shaft imperfections contribute too lip seal leaks

Answer 36

Burrs and deposits grit.

Question 37

Lip seal direction

Answer 37

Inclusion seal in Exclusion keep dirt out

Question 38

What must be done to felt ring before installing

Answer 38

Must be soaked in oil

Question 39

Operation of spiral groove seal

Answer 39

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

Question 40

Labyrinth defined as

Answer 40

A torturous path

Question 41

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

Answer 41

6 o'clock or at bottom

Question 42

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

Answer 42

1500- 3000

Question 43

O ring fully confined psi eg b fitting

Answer 43

10,000 psi

Question 44

O ring Grove width

Answer 44

120-150 percent

Question 45

O ring squeeze static and dynamic

Answer 45

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

Question 46

O ring depth of Groove dictates...

Answer 46

The o ring squeeze

Question 47

Secondary seal in machanical seal is

Answer 47

Static

Question 48

Primary seal in mechanical seal is

Answer 48

Dynamic

Question 49

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

Answer 49

10-15 psi

Question 50

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

Answer 50

Boots and bellows

Question 51

Lip seal psi

Answer 51

2-10 psi

Question 52

Gasket to be careful of for special applications like steam turbine

Answer 52

Asbestos

Question 53

all static seals are

Answer 53

Positive

Question 54

Seals that control amount of leak

Answer 54

Non positive

Question 55

Positive seals

Answer 55

Prevent leak

Question 56

Seals between stationary parts

Answer 56

Static

Question 57

Seals between moving and stationary part

Answer 57

Dynamic