Seals

Question 1

What are the 3 movements found on pumps, compressors, and valves?

Answer 1

Rotating
Reciprocating
Helical

Question 2

What is a major disadvantage to compression packing?

Answer 2

It must leak

Question 3

What is the purposes of compression packing to be left leaking?

Answer 3

Sealing
Cooling
Lubrication

Question 4

What type of movement is reciprocal?

Answer 4

Back and forth

Question 5

What type of movement is helical?

Answer 5

Combination of rotating and reciprocating

Question 6

Why would a packing gland be continuously loaded (live loaded)?

Answer 6

To provide constant pressure on the compression packing

Question 7

When is the effective service life of compression packing reached?

Answer 7

When adjustment to the stuffing box gland fails to give consistent control of the leakage from the compression packing seal

Question 8

How is compression obtained with compression packing?

Answer 8

With a gland follower

Question 9

What is a stuffing box?

Answer 9

The assembly housing packing, a gland, and sometimes a lantern ring or bushing

Question 10

What is a packing gland?

Answer 10

A sealing complement that holds the packing against the stuffing box

Question 11

What is a lantern ring?

Answer 11

A ring used to supply or extract different media’s to or from the stuffing box

Question 12

Explain the characteristic of a lantern ring

Answer 12

A ring
Has a number of holes For lubricants

Question 13

Where is the lantern ring located?

Answer 13

In the bore of the stuffing box housing

Question 14

What are the 3 main purposes of a lantern ring?

Answer 14

Protection
Cooling
Lubrication

Question 15

How often does compression packing need to be “set” ?

Answer 15

Continuously

Question 16

What happens if you over tighten the compression packing?

Answer 16

Increases friction between parts
Acts as a brake

Question 17

Where is the most amount of wear (70%) on both a cantrifugal and reciprocating pumps and compressors?

Answer 17

On the outmost rings closest to the gland

Question 18

What rings do the majority of the sealing in compression packing?

Answer 18

The first 5

Question 19

What are the other rings used for that are not doing the majority of the sealing in compression packing?

Answer 19

Fill space

Question 20

What rings will have the most wear in compression packing?

Answer 20

Rings closest to the fluid

Question 21

What are the 4 main types of compression packing styles?

Answer 21

Square braid
Braid over braid
Inter-braid
Twisted

Question 22

What type of packing is this?

Answer 22

Braid over braid

Question 23

What type of packing is this?

Answer 23

Inter-braid

Question 24

What type of packing is pictured?

Answer 24

Square braid

Question 25

What type of packing is pictured?

Answer 25

Twisted packing

Question 26

What’s the amount an O ring should be compressed?

Answer 26

10-30%

Question 27

What is our main indicator whether a dual seal system is a buffering or barrier type system?

Answer 27

System pressure

Question 28

What is a big concern when using permeated type gasket maker?

Answer 28

It may fall into piping system

Question 29

When a pump is operating with a suction lift and air is being drawn through the stuffing box, what is the best way to correct this condition?

Answer 29

Tighten the packing as necessary

Question 30

What is often used in conjunction with a labyrinth seal to provide complete dynamic sealing in turbines?

Answer 30

Carbon seals

Question 31

What gasket material is commonly used as a gasket on a high pressure steam line?

Answer 31

Wire reinforced graphite impregnated sheet

Question 32

How much will an O ring change the position of a part?

Answer 32

Not at all

Question 33

What is the main purpose of a lantern ring if placed in the bottom of a stuffing box?

Answer 33

Flushing

Question 34

What is the recommended range for a dynamic O ring?

Answer 34

10-30 percent