Millwright Mix 1 Flashcards
A screw compressor is decommissioned and in storage. The machine next to it is vibrating, what will happen?
False brinelling
Given the amount that you need to shim (.010”). How much do you shim the rack and how much do you shim the pinion?
Shim the rack .010”
What would cause wear on a pinion?
Overload/too heavy a load
What do you do before rigging/lifting the top cover of a turbine when dissembling?
Jacking bolts on top half
What is located on all mobile hoisting equipment?
Inspection log
When moving a 48 ton balanced load using 4 2-wheeled casters, how much weight should each caster be rated for?
12 tons (48÷4)
What does a 3-axis robot mean?
Moves in multiple planes
What is the crane signal for load down?
Extend an arm vertically.
pointing a finger toward the
ground, and make small
clockwise circles with the hand.
What is the crane signal for boom down hoist up?
Extend an arm outward and
point the thumb downward,
opening and closing the
other fingers.
What is in a break line that causes cancer?
Asbestos
Who is responsible for all lock boxes in a plant?
Plant supervisor
How do you install a thermal bulb in a container?
Thermowell
Vanes destroyed in a pump after high vibration on startup. What is the cause?
Rotated the wrong way
What is the most important consideration when using a symmetrical 3 legged bridle?
That load can be lifted safely /equal distance to center of gravity
What does a vacuum breaker do on a vessel ?
Prevents collapse
How do you mark the center line of a shaft?
Use center head scribe line, rotate 90ﾟ scribe again
When moving heavy equipment across a bridge what is used to evenly disperse the weight?
Reinforce the bridge
How would you clean your respirator?
Dry cloth and alcohol wipes
How do you test a trip valve?
Close the valve manually trip
A cylinder is acting erratically. What is the cause?
Bent rod
A shaft rotates but has end play what do you do? Where do you shim?
Add Shim to one side
How much material to make a guard with 4” x 8” sheets? One or two?
2
How would you fix a crack in a shroud?
Drill hole in both ends and Weld
How do you change out a sprocket for a smaller one?
Shorten chain and align (a to b)
Belt slips on start up, what do you do?
Add counterweight
There is moisture in a receiver. What will be the result?
Slight decline in direction of flow
A belt is tracking off-center how do you fix it?
Adjust tail Pulley
Split housing of a turbine won’t sit properly. How do you fix this?
Anti rotation tabs
What is the procedure for commissioning a compressor?
Set unloader then start up
What would cause volute to heat up?
Intake closed ( runs dry Burns off packing)
When replacing a gear but no new gear is available what would you do?
Rotate 180ﾟ and broach a new keyway
If damaged- flip the gear over
How do you move/mount a K ( Tapered sleeve bearing) bearing?
Hydraulic nut
When welding 2 precision plates together what would you do?
Weld then machine surfaces
Horizontal band saw is jumping. How would you correct the problem?
Decrease feed increase coolant
Where do you put a condenser?
After receiver
What holds a bearing in the housing?
Internal snap ring
How is a compressor normally operated on initial startup?
Unloaded
Air dryer adsorption occurs what do you do?
Clean desiccant
Clutch is shock loading what do you do?
Adjust linkage
You used a connecting link but chain is too long. What do you use?
Offset link
Where does ground go when welding?
Closest to Weld as possible
What would cause blue smoke?
Worn piston rings (oil)
Belt is running off why?
Unsquared frame
A ladder must be pulled out from the wall by how much?
4:1 - 25%
What is the angle on a prick punch?
30 - 60ﾟ
What is the included angle on the center punch?
90°
How would you repair a bent shaft?
Set on V blocks and use hydraulic press
The horizontal direction is off by .010”
.005 movement
Knife blades are what type of balance?
Imbalance
Vibration measurement
Frequency (how much)
Given amount of shims required under each foot, which foot do you shim 1st?
Highest foot 1st (biggest gap)
What do you do before laser alignment?
Rough alignment
What is the 1st and 2nd step When beginning alignment?
Rough alignment then softfoot
There is a drop in amps what do you do?
Throttle inlet valve
True or false is a laser more accurate over a long span?
True
After rough alignment and softfoot is adjusted what is the sequence of alignment?
Vertical angular, vertical offset, horizontal angular, horizontal offset
(VAVOHAHO)
What bearing do you use for low lubrication applications?
Bushing
Where is the fixed bearing located?
Next to drive end
What is the 1st thing you do before working with grease?
Put on gloves
Why are U joints installed?
For slight angular misalignment
A screw compressor bearing discharges. Where do you fix?
Fix on high-pressure side
What test measures the hardness of something? (Penetration)
Rockwell hardness test
What is the end procedure when finished welding?
Shut off torch, shut off tanks, bleed lines
What is a routine maintenance check on a turbine?
Check oil
Where is the best spot to take a oil sample?
Before filter
Which valve gets greased?
6” rising stem gate valve
Sequence valve in hydraulic cylinders is located?
Between valves (line c)
What are good qualities for mentoring an apprentice?
Good knowledge base and communication
How do you check the temperature of a bearing?
Temperature gun
What is the 1st consideration when transferring liquids?
Remove Ignition sources
How do you find a safe operating temperature of equipment?
The manual
As a choker sling angle decreases what happens?
More stress on the slings
What do you do when you’re done working with the torque wrench?
Release Tension
What do you check 1st after new motor installation?
Mag test/rotation
What is the procedure for replacing DCV spool ?
Lube before installing
System that uses past and present equipment history?
Predictive
System that’s schedules?
Preventative
What is the procedure for commissioning a reciprocating water cooled pump?
Vent jackets, water pressure, start pump, test
How much do you feel a gear Box with a oil?
Half way up the lower roller
A belt worn on one side how do you correct?
Align sheaves
Cylinder doesn’t fully extend what is the cause?
Bent rod
There’s hammering in a pump system. What is the cause?
Cavitation
What sling has the most stretch?
Synthetic Web
Contact seal leaking what is the cause?
Shaft run out
What type of oil is used in a compressor crank case?
What type of oil is used in a diesel engine?
Non detergent -compressor
detergent - diesel engine
What is the procedure for rebuilding a reduction gear drive?
clean, mark, take a part
In a new system what relief valve do you choose?
Maximum system pressure
Cylinders are moving slowly why?
Internal leakage/pinched line
When does a new employee receive orientation?
Before work starts
Before working on fan blades what is the procedure?
Deenergize, lock out tag out, secure blade, fix
What causes vibration in an induced fan?
Build up
A hydraulic pump is operating normally at the right speed but there is no pressure what is the cause?
Faulty relief valve spring
Setting Up optical level procedure
Wooden Tripod
Procedure to repair prime mover
Clean, match mark, disassemble
What is the procedure before grouting?
Elevation, rough surface, clean, sole plate, torque 50%
What is the procedure to shorten a conveyor belt?
Slacken, secure, cut, install, splice, tighten
Belt deflection
1/64
How much can you run up a drive?
75%
3/4
Moderate speeds
Before working on a fan procedure
Deenergized, lock out tag out, block fan blades, etc
