Seals

Question 1

What type of cut is a skived cut?

Answer 1

Diagonal cut

Question 2

What is the recommended compression range for a dynamic O-ring?

Answer 2

10 to 30%

Question 3

What type of seal consists of a complicated network of grooves to create a seal?

Answer 3

Labyrinth seal

Question 4

What kind of material is neoprene?

Answer 4

Type Of rubber

Question 5

What is often used in connection with labyrinth seals to provide complete sealing in turbines?

Answer 5

Carbon seals

Question 6

What is used to create the force of compression required for sealing flanked with a gasket?

Answer 6

Bolts

Question 7

What must be completed before any gasket or packing maintenance is carried out

Answer 7

All source of energy must be removed and secured

Question 8

When tightening, bolt flanges, what order should you follow?

Answer 8

Star pattern in several steps

Question 9

Which type of seal is flange gasket

Answer 9

Static seal

Question 10

Which method is the best to use when cutting packing range to repack a stuffing box?

Answer 10

Wrap, packing material around a man drill of the shaft size

Question 11

When tightening a pack in gland, how many terms must you turn each nut at a time?

Answer 11

Each nut 1/6 of a turn or flat at a time

Question 12

How many drops of leakage per minute is recommended to properly cool and lubricate the packing within a stuffing box of a pump

Answer 12

40 to 60

Question 13

How are oring sized

Answer 13

Using inside diameter and thickness

Question 14

What is the number one cause of pump down time?

Answer 14

Ceiling or packing failure

Question 15

What is a big concern when using permatex type of gasket maker?

Answer 15

Permatex may fall into piping system

Question 16

What choice would you consider when using a whole punch to make the whole bolt in a gasket?

Answer 16

Use a soft base under the material

Question 17

What are labyrinth seals?

Answer 17

Non positive seals which have a tongue and groove design

Question 18

Advantages of quenching?

Answer 18

Prevents leakage of corrosive ou toxic fluids.
Prevent crystallization ground the contact face
Maintain A constant operating temperature and minimize any heat transfer along the shaft.

Question 19

Where are lip seas use?

Answer 19

Used in low Pressure areas (2 to 10 psi), primarily used on rotating shafts

Question 20

What is a diaphragm seal?

Answer 20

Positive seal which has a flexible membrane which spans between the stationary and moving parts.

Question 21

What are the two styles of diaphragm seals?

Answer 21

Flat diaphragm seal - designed for a small amount of movement
Rolling diaphragm seal- moulded membrane and rolls on the two mating surfaces as it moves

Question 22

What is a ring seal?

Answer 22

Non-positive seal which is mounted into a groove in the housing. Made out of cork, felt, leather, or synthetic rubber

Question 23

What is a wiper (scrapper)

Answer 23

Non-positive seal mounted on the stationary housing.it flexes against axially moving parts

Question 24

What are boots and bellows ?

Answer 24

Positive seals which have one and secured to the housing and the other to-the moving parts. Boots are used for short movements (strokes) and bellows for long ones

Question 25

What are the three categories that packing is divided into?

Answer 25

Compression, automatic, floating

Question 26

What determines the #of bolts needed ?

Answer 26

Thickness of metal

Question 27

Seals that prevent fluid from leaking from one side of a system to the other is called -

Answer 27

Positive seal

Question 28

Seals which control the amount of such leakage are called -

Answer 28

Non-positive seals