compression packing

Question 1

Compression packing must control what a long moving parts?

Answer 1

leakage

Question 2

Motion on pumps and compressors can be?

Answer 2

rotary, reciprocating or helical (spiral)

Question 3

True or false, as well as ceiling compression packing can act as a bearing?

Answer 3

true

Question 4

true or false Automatic packing seals, in one direction only (uses system pressure to help seal) while the squeeze type seals, seal in both directions .

Answer 4

true

Question 5

Overtightening the packing, increases the what between moving parts

Answer 5

Increases the friction and acts as a brake

Question 6

Spiral wound packing is installed with the spiral oriented for shaft?

Answer 6

shaft rotation

Question 7

Radial wound packing is radial wound around the shaft to form ?

Answer 7

rings

Question 8

What is another word for lantern rings?

Answer 8

seal cages (h shaped with radial holes to allow fluid thru

Question 9

Compression packing is used to throttle the fluid, and therefore some leakage occurs what is the approximate leakage rate

Answer 9

40-60 drops per minute

Question 10

What is normally the pump pressure

Answer 10

10-15 psi

Question 11

Packing material can be carbon yarn-temps up to__F and shaft speeds of ___ ft per minute. Graphite yarn – good all around packing used in strong acids, caustics and chemicals.

Answer 11

600 F
speeds up to 2500 ft per min

Question 12

Where is graphite yarn used?

Answer 12

Environments were strong, acids caustics, and chemicals are present. It is excellent heat conduct, Tivitt, he and chemical resistance.

Question 13

Metal packing –foils and coils and can be what material

Answer 13

soft copper, lead Babbitt and aluminium.

Question 14

Vegetable fibre- cotton and flax and used for?

Answer 14

cold water, brine or cold oil.

Question 15

packing is staggered how many deg apart?

Answer 15

90 deg

Question 16

To determine the correct size of packing – measure the shaft diameter and the bore of the stuffing box. Subtract the shaft dia from the bore dia and divide by 2 = cross-section of the packing.

Question 17

Name for possible causes of premature packing failure

Answer 17

incorect installation
wrong type
wrong size
excessive heat

Question 18

Name two places in which the lantern ring can’t be located in the stuffing box

Answer 18

under the seal water connnection
at the bottom of the stuffing box

Question 19

Name three metals commonly used in metallic compression packing

Answer 19

babit
annealed soft copper
aluminum

Question 19

Which types of packing seal in only One Direction

Answer 19

cup packing
v packing u cup packing

Question 20

Why must compression packing throttle the fluid?

Answer 20

inorder to seal and control leakage

Question 21

Lantern ring(steel cage) is it necessary component in all stuff in boxes

Answer 21

false
Not all compression packing situations require lubrication, such as Teflon

Question 22

What are the purposes of sad trips and compression packing

Answer 22

fills the voids in the yarn and acts as a lubricant

Question 23

Radial wound packing can come in braid over braid and interlock braid construction

Answer 23

false
Ribbons are wrapped around the shaft several times to produce a thicker ring-shaped to fill the stuffing box. Ribbons cannot be braided to become thicker cross-sectional shape

Question 24

jam packing can have long run in time true or false?

Answer 24

true - you as the millwright must inspect and make adjustments

Question 25

true or false ?
roughly 70% of wear on shafts is on the outtermost rings closest to the gland?

Answer 25

true - this is because the mechanical pressure applied by the gland flower is the greatest