Advance Alignment

Question 1

What is not a result of poor coupling alignment?

Answer 1

cooling of shaft

Question 2

When feet do not equally support the weight of the machine its called…

Answer 2

soft foot

Question 3

When doing a rim and face alignment an _____ attachment can be used

Answer 3

wiggler

Question 4

When using rim and face alignment

Answer 4

1 shaft turns

Question 5

Runout can be…

Answer 5

eccentric and angular

Question 6

Total indicator readins are done at..

Answer 6

4 positions at 360 degree swaps

Question 7

The maximum number of shims to use on 1 foot is….

Answer 7

3

Question 8

Main purpose of coupling alignment is to ….

Answer 8

bring center of shaft together

Question 9

Most accurate method of calculating thermal change is at..

Answer 9

ambient temperature

Question 10

Gap between foot and shim pack should be less than..

Answer 10

0.001

Question 11

Offset misalignment is also called…

Answer 11

• rim alignment

- parallel alignment

Question 12

Possible causes of rise in temperature

Answer 12

• steam
• compression
• chemical reaction
• electrical load, friction
• possibly the removal of heat

Question 13

Thermal growth

Answer 13

-small movements that occur in all types of industrial equipments due to temp changes
- AL = Lo x AT x a
AL = change in length
Lo = original length
AT = change in temp
a + coefficient of expansion (obtained from chart)

Question 14

1) Class A - water & foam, dry chemical, water mist
2) Class B - carbon dioxide, dry chemical
3) Class C - carbon dioxide, dry chemical, water mist, clean agent
4) Class D - dry powder
5) Clas K - wet chemical

Answer 14

1) wood, paper and cloth
2) flammable and combustible liquid and such as gasoline and paints
3) energized electrical equipment
4) flammable metals such as sodium, potassium and lithium
5) kitchen fire

Question 15

Laser check

Answer 15

Machines are typically aligned in a conventional manner using dial indicators or lasers, another laser/reflector system monitors the movement of one machine casing with respect to the adjacent casing

Question 16

Optical methods check

Answer 16

• cold alignment is the benchmark
• movement is referenced to the line of sight
• optical levels and jig transits are used to determine vertical and horizontal machine movements
• this baseline data is taken off flat-machined split joint surfaces

Question 17

Proximity probes with water cooled stands

Water-cooled units made from titanium or invar ( high nickel steel) are preferred

Answer 17

With this method, water cooled stands attach to the foundation near the couplings and outboard housings. These stands support electronic proximity probes, which monitor the movement of the coupling, shafts and/or machine casings relative to the foundation

Question 18

Dodd bars check

Answer 18

• provide continuous online monitoring and uses proximity probes that fasten to permanently mounted brackets on the coupled machines
• the brackets attach to the housing not the shaft

Question 19

Instrumental coupling check

Answer 19

• uses electronic probes built into the coupling spacer
• base data is by coupling calibration
• proximity probes within the coupling detect misalignment
• signals and power are transmitted by stationary transformer

Question 20

Benchmark gauges ( tooling ball method)

Answer 20

• very reliable and relatively easy to use
• monitors the movement of bearing housings or machine casings with respect to the equipment foundation
• movements are measured by digital benchmark gauge
• alignment analyzed by PC program

Question 21

Which methods has alignment probes built into the coupling?

Answer 21

instrumental coupling

Question 22

Spindle shaft coupling alignment

dial B” A’ dial

Answer 22

• alignment method to negate the effects of bar sag over long distance
• this method correct angular misalignment in the vertical and horizontal planes
• positive readings are toward the datum (original zero on A dial)
• negative readings are away from the datum (original zero on A dial)
• only for angularity misalignment

Question 23

Online hot alignment checks most common methods

Answer 23

• optical
• laser
• proximity probes with water-cooled stand
• Dodd bars
• benchmark gauges
• instrumented couplings

Question 24

In-lign of 2 machines called..

Answer 24

co-linear

Question 25

Big disadvantage on rim and face?

Answer 25

end float

Question 26

Rough alignment allowable

Answer 26

10 mil

Question 27

Which shaft alignment procedure is affected by axial load?

Answer 27

rim and face

Question 28

Of the alignment procedures used, which requires 2 telescopes both focused to infinity, to established a line of sight which is parallel?

Answer 28

collimation

Question 29

Of the alignment procedures listed which requires a light source and mirror?

Answer 29

auto collimation

Question 30

In the rim and face formula, what does D represent?

Answer 30

diameter of the circle the face dial makes

Question 31

________ are used to established the exact position of machinery

Answer 31

centerlines

Question 32

________ are used as reference points for levelling machinery to elevation

Answer 32

benchmark