bearings and seals / packing test Flashcards by kk kk

with friction bearings, the area of contact is relatively large and the pressure on the bearing material is usually low compared to anti friction bearings

true

False

true

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friction bearings have 3 types of radial loads. which on shifts thru an arc less than 180 degrees

stationary

ocillating

reciprocating

alternating

oscillating

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the choice of friction bearing and housing depends on load, rotational speed, support design and _______

direction of pull

rubbing speed

shaft size

bearing material

direction of pull

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a split joint design that can give up to 270 degrees of bearing load (pull from sides and above split) is the_______

angle

4 bolt split

flat joint

gib joint

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journal bearings can be either split or one piece (bushing) and have metallic liner materials made of

babbitt

brass

nylon

phenol laminates

both the 1st and 2nd answers are correct

all the above

babbit and brass

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plastic bearings such as nylon will have

a thermal expansion rate of 10 times that of steel

a fully staurated water expansion rate of 0.0256” per inch of material

the ability to run without lubrication

all the above

all of the above

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2 of the common babbit bearing alloys are

tin, brass

bronze, lead

tin, lead

aluminium, antimony

tin and lead

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a thick walled construction split bearing with a spherical seat will

self align its bore with the sag in the shaft decreasing the bearings load capacities

self align its bore with the sag in the shaft decreasing edge loading of the bearing

be used on light load applications

be made of sintered bronze

self align its bore with the sag in the shaft decreasing edge loading of the bearing

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babbitt completely melts at ______degrees C, pours at __________degrees C, completely solidifies at ________ degrees C.

280, 370, 250

370, 450, 350

280, 370, 340

180, 250, 220

babit melts at 280
pours at 370
solidifies at 250

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when dealing with babbitt, you should not

have water on or around the area where the pour is taking place

over heat the babbitt

use lead unless area is properly vented and wearing proper PPE

all the above

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when fitting a poured babbitt bearing, you will relieve the corners of the bottom half of the bearing and add an oil groove

to the sides

to the top

to the unloaded area of the bearing

to the loaded area of the bearing

to the unloaded side

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for cleance in friction bearings, a general rule of thumb is - 0.001” clearance per inch of shaft diameter

true

False

true

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to adjust the clearance in a split plain bearing, you would

add shims to the joint to decrease the clearance

take out shims to decrease the clearance

scrape bearing in loaded section

scrape bearing in unloaded section

take out shims to decrease the clearance

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when using plastigage, you must choose the diameter about equal to the bearing clearance, lay it down on the shaft, add cap and once it has been torqued down and then the cap removed, you will measure the

thickness with a micrometer

width with a vernier caliper

the thickness with a plastigage chart

the width with a plastigage chart

the width of the plastic gauge chart

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crush and spread are built into the bearing shell to help lubricate the bearing liner

true

False

false

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when removing plain bearings from a housing, the housing halves should be match marked for proper installation

true

False

true

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small bushings will have to be ______ to bring the bore to the proper diameter

drilled

machined

reamed

none of the above

reamed

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use a stone to remove any burrs from the journal and polish it with

emery cloth

crocus cloth

sand paper

draw filing

crocus cloth

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always check the shaft straightness and the journal for out of round and taper. to do this, you would take _______measurements________ degrees apart around the journal. you would make these measurements at ____ different points along the journals length

3, 120, 3

6, 60, 3

3, 120, 6

3, 60, 3

3,120,3

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a housing fit check is done by adding 0.005” shims under the bearing cap and using a 0.006” lead wire on top of the bearing insert. you then replace cap and torque. when cap is removed the lead wire should measure_________

the same clearance as in the bearing

1 or 2 mils

the same as the shim thickness

any of the above

the same as the shim thickness

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use a hole or telescoping gauge to measure bore diameters. use a ___________ to transfer the measurements to a readable number

vernier caliper

tape measure

inside caliper

vernier micrometer

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when driving in a bushing, you should first slightly chamfer the inside and outside edges and then use an adapter with adriver. the adapter helps prevent _________ of the bushing

improper alignment

collapsing

distortion

all the above

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an ideal area of contact of a plain bearing after scraping would be spots about ____ over an area of ____ of the surface

1/16”, 50 %

1/8”, 50 %

1/8”, 85 %

1’\/16”, 85%

1/8th ,85%

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end float is controlled by the use of a

radial plain bearing

thrust bearing

bushing without a collar

all the above

thrust bearing

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hyrodynamic bearings need a designated________ for a given _____ for full film support minimum speed, load maximum speed, load minimum speed, shaft size maximum speed, shaft size

minimum speed, load

a plain bearing with an unsteady load at high speed will develope oil whirl true false

true

hydrostatic bearings are found on equipment tht operates ___________ at to slow a speed to form an oil wedge with shock loads at high speeds the 1st and 2nd answers are correct

at to low a speed to form an oil wedge and with shock loads

thrust bearings can use direct lubrication and tilting pads to help form the oil wedge true False

true

embedability of a bearing material is its resistance to cracking ability to support shaft loads ability to retain a film of lubrication ability to handle contaminants

ability to handle contaminants

a lift check is used to check___________clearance axial radial initial

radial

internal and external self-aligning bearings are used when alignment is impratical or impossible to maintain to accommodate angular misalignment when mounting the are small amounts of shaft wobble all the above

all the above

to load the balls into a conrad bearing you need to squash the outer rings diameter slightly true false

true

antifriction bearings have cages that ______________ prevent the rolling elements from rubbing push the rolling elements thru the unloaded zone guide the rolling elements all the above

all the above

when using angular contact bearings in pairs, use the______________ configuration for axial loads in one direction face to face back to back tandem

tandem

cylindrical roller bearings can handle radial loads only true false

true

tapered roller bearings will need to be ______________ to help the rolling elements turn clearance a shrink fit force fit preloaded

pre loaded

carb bearings are used in situations that have some mislaignment and axial float true False

true

if you had a bearing number of 6208 K RS, the clearance would be C-2 less than standard standard more than standard

standard

if you had a series 6 bearing, it would be a ____________ bearing tapered roller ball thrust deep groove ball spherical roller

deep grove ball

if you had a 22208 bearing, it would be a ________ and have a bore of _______ double spherical roller, 40 mm double ball, 8 mm single cylindrical, 40 mm single deep groove, 8 mm

double spherical roller 40 mm

a bearing ring subject to a stationary load will have a/an__________ to allow for creep interference fit press fit push fit force fit

push fit

if a bearing being mounted has seals, you would heat it up to _____ or if not sealed, heat to_______ 120 c, 80 c 120 c, 120 c 80 c, 120 c 175 c, 250 c

80c for seals 120 if not sealed

when inspecting bearings, you find discoloration, this is a sign of contamination overloading overheating fatigue

over heating

residual clearance is measured before it is mounted after it is mounted after it is running any of the above

after its been mounted

mounting separable cylindrical bore bearings and needle bearings with no inner ring, you will use________to aid in installation guide mandrels guide sleeves slight chamfers on shafts all the above

guid mandrels guide sleeves slight chamfer on shaft

to find the internal clearance on a spherical roller bearing, you can use feeler gauges true false

true

when using the turning angle for axial drive up of tapered bore bearings with adapter sleeves, the larger the shaft will have the smaller the turning angle the larger the turning angle the turning angle should be the same for all sized bearings smaller than the bearing

the larger turning angle

when using oil injection to dismount a tapered bore bearing, you should back off the retaining nut (do not remove it) true False

true

if shaft runout is more than 0.001" or bearing seat wear exceeds 0.0005", they need to be straightened, fixed or replaced true False

true

welding is done on a bearings outer ring (when in a housing) to _______________to help in the removal of the ring expand the ring to shrink the ring melt the ring none of the above

shrink the ring

if a bearing runs at a temperature higher than 55 degrees C, __________ will occur rapid oxidation temperatures will decrease longer bearing life full film strength

rapid oxidation

brinelling is impact denting spalling fretting fatigue

impact denting

imbalance and misalignment are the 2 main causes of vibration in bearings true false

true

improper selection of a bearing will include, wrong clearance, material or type true false

true

fatigue in bearings will result in micro cracks in or under surfaces Option 2pitting of surfaces flaking of surfaces all the above

all the above

if you have excess grease or oil in a bearing housing you will get a increase in temperature of the bearing when running true False

true

hydrostatic lubrication uses pressure instead of speed to force the oil film into the loaded area of the bearing true false

true

one advantage that grease has over oil is faster running speeds lower running temperatures better sealing capabilities removes contaminants

better sealing capabilities

when removing a withdrawal sleeve from a bearing, you will need a withdrawal nut that fastens to the sleeve and pushes against the_____________________ bearing outer ring bearing inner ring both the inner and outer ring the withdrawal nut fits onto the shaft and pushes on the withdrawal sleeve

the withdraw nut fits onto the shaft and pushes on the withdrawal sleeve

when replacing bearings on a reduction unit, it is important to make sure the bearing cover is properly oriented to allow for proper oil drainage. true false

true

how many fixed bearings are on a line shaft and where would it/they be located. 1, any where 2, one, each end 1, at the drive end 2, at the drive end and by a sprocket

1 at the drive end

if you mounted tandem angular contact bearings backward, the load would ___________supported in the direction intended not be be would stay the same as there is no difference the way they are mounte

not be

when installing a seal on a bearing housing, this would be called a shield integral seal external seal contact

external seal

a static seal seals between 2 moving parts 1 moving part and 1 stationary part 2 stationary parts both the 2nd and 3rd answers are correct

2 stationary parts

a seal that controls leakage is called a non-positive seal true false

true

a lip seal uses a _____ to help seal before startup and ___________after startup garter spring, retaining ring garter spring, resilience of the lip material garter spring, resilience of the lip material, whirling lubricant and gas pressure none of the above

garter spring resilience of the lip material , whirling lubricant and gas pressure

a v-ring seal is attached to the shaft seals against contaminants with a flinger action seals against a smooth surface on the housing all the above

all the above

an external non-rubbing seal that uses a tongue and groove design and a torturous path to help keep contaminants out is the single lip seal shield seal labyrinth seal felt seal

labyrinth seal

to help pillow block bearings maintain thier position, you would use keystock welded to the ends and/or sides of the pillow block, depending on the action of the load(s) true false

true

compression packing is squeezed in a confined space by the water pressure expansion of the packing gland follower centrifugal force

gland follower

automatic packing is cup packing has an interference fit on the shaft or cylinder walls has system pressure help aid in sealing all the above

most of the wear on shafts from compression packing is located at the inner 2 rings of packing at the outer 2 rings of packing equal on all rings of the packing next to the pump

the outer 2 rings of packing

radial wound packing is wrapped around the shaft until it's O.D. just fits into the stuffing box true False

true

when th lantern ring is used for cooling and sealing out harmful chemicals from the pumping medium, the lantern ring would be located under the seal water (at a pressure 10-15 psi above the pump) connection and at the top of the stuffing box bottom of the stuffing box in the middle of the stuffing box it does not matter, it will work equally as well in any spot

bottom of stuffing box

spiral wound packing is installed so it will correspond to shaft rotation true False

true

mechanical seals are used where leakage of the dangerous product cannot be tolerated true False

true

once the packing is installed in the stuffing box and has been seated and allowed to expand, you will _____________nuts, start pump and allow packing to leak freely. than gradually tighten gland nuts till you get a controlled leakage of_________drops per minute finger tighten, 100 to 200 fully tighten, 40-60 finger tighten, 40-60 fully tighten, 100-200

finger tighten 40-60 drops per minute

mechanical seals are made up of 4 basic components. which of the following is not one of them primary seals secondary seals shaft packing or insert mounts saturant

saturant

the primary sealing point of mechanical seals is between the shaft and sleeve rotating and stationary seal mating faces rotating seal and shaft stationary seal and the housing

rooting and stationary seal mating face

the primary seal of the mechanical seal is aided by product pressure and springs bellows lubrication between mating faces all the above

all the above

if you saw a mechanical seal with spiral grooves on one of its faces, it would be would be a water lubricated seal gas lubricated seal you would not see a seal like this none of the above

gas lubricated seal

o-rings that are used in both static and dynamic applications for mechanical seals are primary seals secondary seals complimentary seals all the above

secondary seals

a pusher seal uses ______________ to help aid sealing a single spring multiple springs bellows the 1st and 2nd answers are correct

a single spring and multiple springs

there are 2 ways to drive the rotating ring on a mechanical seal. they are mechanical, friction mechanical, pins friction, o-rings clamping, friction

mechanical and friction

gland jackets come with connections for internally or externally supplied fluid for flushing quenching lubricating all the above

all the above

bypass flushing is when an outside source of fluid is used the pumping medium is used to remove heat an external source fluid has a higher pressure than the seal chamber the pumping medium is kept out of the chamber

the pumping medium is used to remove heat

barrier systems use a barrier fluid admitted between the 2 seals of a double seal. the pressure is higher than the pumping medium lower than the pumping medium the same pressure of the pumping medium none of the above

higher than the pumping medium

the main difference between balanced and unbalanced mechanical seals is face loading is minimized on unbalanced face loading is minimized on balanced leakage is greater on unbalanced leakage is less on balanced

face loading is minimized on balanced

when rotational speeds exceed 4500ft/min, you will replace a rotating seal with a unbalance seal balanced seal stationary seal compression packing

stationary seal

when if the pumpage comes in contact with the springs and collars and the O.D of single seals is exposed to the pumpage it is classified as a/an outside mounted seal inside mounted seal double lip seal v-ring seal

inside mounted seal

to help simplify mechanical seal installation, cartridge seals are used true False

true

on back to back dual seals, the 2 rotating seals face away from each other to keep out the pumping medium. also the barrier fluid should be 10 % higher than the stuffing box pressure should be compatible with the pumping fluid needs to lubricate the seals all the above Correct

all the above

on double mechanical seals, if you used a buffer fluid instead of a barrier fluid, it would be called a dual seal tamdem seal modified double seal any of the above

tandem seal

when installing a mechanical seal you will first scribe a line on the shaft to indicate the seal housing face, than from the seal housing face line, measure and scribe the seal setting point which is where the seal locking devices will be locked to the shaft to give the seal faces their required loading true false

true

do not lubricate the seal faces and avoid touchung the seal faces true false

true

when dealing with gaskets and piping, it is a must to make sure that all pumps and piping are locked out purged blinded all the above

all the above

when inspecting and troubleshooting mechanical seals, if the wear pattern on the stationary seal is wider than the diameter and width of the rotating seal face, it is an indiction that all is well with the sealing faces there is pump misalignment shock loading there are high temperatures

pump misalignment

if the seal faces have chips, this is a sign of high temperatures pump missalignment the liquid flashing to vapour o-rings swelling

liquid flashing to vapour

on a lip seal, if the lip is sealing out contamination, the lip faces in out does not matter

out

solid metal ring gaskets of the delta, oval and octagonal ring design do not need high bolt loading to seal true False

true

gaskets are used to seal between 2 surfaces and need to ______________to positively seal fill voids and irregularities be under more pressure than the sealed fluid handle internal and hydrostatic end force all the above

all the above

gasket thickness is critical because internal alignment and clearances can be change true false

true

the advantage of flat ring gaskets over full face gaskets better sealing easier removal from the flange more flexible a larger O.D.

easier removal from the flange

spiral wound gaskets are used for high pressure and temperature applications true false

true

when making a gasket you need to know the the O.D. I.D. bolt hole spacing and bolt circle diameter all the above

all the above

when using the angle method of finding the bolt hole spacing, you would divide 360 degrees by the number of spaces needed to match the bolt holes in the _________________ flange flange plus 1 flange minus 1 none of the above

flange

when making the bolt holes in the gasket, they should be sightly smaller than the bolt diameter slightly larger than the bolt diameter size on size of the bolt diameter

slightly larger than the bolt diameter

if you find a gasket, that is being replace, breakin into pieces, this would be a sign the gasket was the wrong type the installation procedure was wrong both the first and 2nd answers are correct

wrong gasket wrong installation procedure

when cutting gaskets, you would use a softer material such as wood under the gasket when puching holes true false

true

to help transfer the flange shape to the gasket material, you can use prussian blue true false

true

when scraping a gasket, make sure to scrape away from you and do not damage the sealing surfaces true false

true

when torquing the bolts down on the flange, it is more efficient to take 2 or 3 passes around the bolt sequence to get to the full clamping pressure required true false

true

o-rings for static applications require a crush amount equal to 10 % of thier diameter true false

true

hardening sealants are flexible rigid all of the above

all the above

packing installed in the stationary unit is called inside packed true False

true

if you see a stuffing box code that reads 4-L 2-G, this means 4 rings of packing, lantern ring than 2 rings of packing and than the gland 2 rings of packing, lantern ring, 4 rings of packing and than the gland 4 rings of packing, lubrication, 2 rings of packing than the gland

4 rings of packing, lantern ring than 2 rings of packing and than the gland

when cutting packing use a wooden mandrel of the same size as the shaft and wrap packing around it and then cut it either with a butt cut or diagonal cut true false

true

when installing packing it is of the utmost importance to use a s-twist to put on rigid packin, stagger the joints 90 degrees and if stuffing is bulged, use a roller to flatten packing slightly true False

true

v-ring packing sets used on double acting cylinders should face each other true false

true

cup packing is considered an unbalanced packing and should have a rigid separator between the 2 cups when used on double acting pistons true False

true

lip seals are used in low pressure areas (2 to 10 psi) and do not need lubrication on the lip to seal true false

false

back-up rings for o-rings help stop extrusion of the 0-ring into the gap when exposed to high pressures true false

true

when installing o-rings onto a shaft, protect the o-ring by adding a shaft sleeve and rolling the o-ring into place true false

true

floating packing is allowed to move in a groove and seal by means of spring tension true False

true

wipers are used to clean the shaft or foreign materials expel foreign materials away from the seals allows lubricant from the equipment to remain on the rod all the above

all the above

in an emergency, (for lip seals) you can ________________ to accomadate for shaft wear under the lip of the seal change the seal to a wider seal reverse the seal install a spacer behind the seal install a thin sleeve over the worn spot all the above

all the above

if the wear pattern on the mechanical seal is limited to 0.005" in depth you can use a course, diamond impregnated plate to remove the pattern using a back and forth motion true false

true

when doing the final step of polishing, use a 6-micron, diamond impregnated plate and a figure 8 pattern when moving the seals on the surface true False

true

what type of bearing is this

plain split thin shell

if the light band patterns on the seal surfaces have straight lines, this means the seal faces are not flat true False

false

what type of bearing is this spherical roller cylindrical roller tapered roller cylindrical thrust

tapered roller bearing

what type of bearing is this needle tapered roller needle thrust none of the above

what type of bearing is this pillow block flanged eccentric locked cartridge flanged set screw locked

flanged set screw locked

what type of bearing is this deep groove ball bearing loading slot ball bearing angular contact ball bearing brass cage roller bearing

anger contact bearing