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Plain Bearings > Machine Technology > Flashcards

Machine Technology Flashcards

1
Q

What is the taper for national pipe taper threads?

A

3/4” per foot or 1/16th per inch

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2
Q

What is the standard finish for pipe used in hydraulic service?

A

Pickled and oiled

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3
Q

How can you check for a twist in a hose after you have installed it?

A

Look for a twist in the writing or the lay line

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4
Q

How do felt seals reduce friction?

A

By absorbing oil

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5
Q

Regarding primary seal face pressure, what can mechanical seals be?

A

Balanced and non-balanced

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6
Q

Select all the correct secondary seal designs.
V-ring, PTFE wedge, O-Ring, U-cup, RTV urethane

A

V-Ring, O-ring, U-Cup, RTV urethane

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7
Q

TorF. Rings 6-10 in a stuffing box are not particularly important in the sealing process

A

True

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7
Q

What does the term repacking a valve encompass?

A

Remove, inspect and replace packing in the stuffing box.

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8
Q

What must be done to disassemble threaded pipe?

A

Use two pipe wrenches and turn the pipe counter-clockwise

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9
Q

When should a flare nut be installed on a length of tubing?

A

Before flaring

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10
Q

TorF. Straight threads are commonly used in hydraulic systems?

A

True

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11
Q

Select all the answers that explain why flushed gland seals circulate fluid around the seal face?
To Lubricate, To cool, To clean, To heat

A

To Lubricate, To cool, To clean

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12
Q

TorF. Compression packing is used to seal shafts that have reciprocating, rotary, or helical motion

A

True

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13
Q

TorF. Plug and ball valves require a full 360 degree turn to open or close fully

A

False

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14
Q

What is the thread that has a spiral leak path if assembled dry?

A

NPT

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15
Q

TorF. Weld outlet fittings are used to attach branch lines to a main pipe.

A

True

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16
Q

TorF. Swing check valves must be mounted horizontally.

A

True

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17
Q

What types of materials are used in the construction of bellows?
Metal
Rubber
PTFE
Fabric

A

Metal, Rubber, PTFE

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18
Q

The heaviest wall copper tube used for plumbing has what letter designation and colour?

A

K, green

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19
Q

Schedule 80 pipe differs from schedule 40 pipe because it has a

A

smaller id

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20
Q

What is the RPM limited to when using a lip seal on a 2 inch unhardened shaft?

A

1500

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21
Q

In a drawing, which of the following terms describes the calculated length of pipe required?

A

End to center, end to end, face to face not

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22
Q

TorF. Reducing the number of fittings in a pipe system reduces the fluid turbulence in the system.

A

True

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23
Q

TorF. Gas barrier seals use a stable film of gas in micro grooves to accomplish sealing.

A

True

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24
Q

A flexible hose with a 10,000 psi rating would have a burst pressure of:

A

40,000 psi 40:1

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25
Q

ToF. It is always good practice to use some sort of anti seize compound on the gasket when installing the gasket.

A

False

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26
Q

What type of hanger allow pipe to move up and down freely?

A

Spring

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27
Q

ToF. The ID is always the same for different pipe weights.

A

False

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28
Q

What should you do to a tube after it’s cut and before you have completed the flaring process

A

Remove the burr?

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29
Q

ToF. There is no rubbing between faces of a gas lubricated seal.

A

True

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30
Q

ToF. The disc of a gate valve can be wedge shaped only?

A

False

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31
Q

What type of fitting is used for very high temperatures and/or pressures?

A

Welded

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32
Q

ToF. Seals can be both contact and non-contact

A

True

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33
Q

When joining two pieces of pipe together under 2 inches what is the most common welded joint?

A

Socket Weld

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34
Q

Too much closing force can cause what problems?
Loss of lubrication, premature wear and seal failure, High frictional heat, Loss of pressure, Higher seal face loading

A

Loss of lubrication, Premature wear and seal failure, High frictional heat, Higher seal face loading

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35
Q

ToF. Flow control valves should not be used for isolation purposes.

A

True

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36
Q

ToF. Non-contact seals are positive seals

A

False

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37
Q

Select materials that are commonly used for primary seal faces.

A

Ceramic, Titanium, Carbon, Silicone carbide, Tungsten carbide, Stellite, Bronze, Ni-Resist

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38
Q

ToF. The ends of hydraulic pipes are sealed and should no be opened until installation.

A

True

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39
Q

What does the valve marking WOG stand for?

A

Water, Oil, Gas

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40
Q

What are non-pusher type seals also referred to as?

A

Bellows

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41
Q

How should Teflon tape be wrapped if used on NPT pipe?

A

So the spiral tightens as the pipe is threaded together.

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42
Q

How many threads should show after you hand tighten a pipe fitting?

A

Two or three

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43
Q

ToF. Hose fittings are sized with a dash number the same as hose fittings?

A

True. Dash = # of 1/16ths

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44
Q

ToF. Reducing the number of fittings in a pipe system reduces the friction in the system and keeps the temperature of the fluid flowing in the system cooler.

A

True

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45
Q

How is seamless pipe manufactured?

A

Extruded

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46
Q

What are bellow seals commonly made from?

A

PTFE and Metal

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47
Q

Lip seals incorporate a _____ to maintain contact when there is no internal pressure present.

A

Garter spring

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48
Q

ToF. Ribbon packing should be compressed 50% before the next ribbon of packing is applied.

A

True

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49
Q

What type of material is commonly used for the construction of the bellows seal?

A

PTFE

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50
Q

ToF. Weld outlet fittings are used to attach branch lines to a main pipe.

A

True

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51
Q

Select all pipe end finishes.
Threaded, Plain, Bevelled, Grooved.

A

Threaded, Plain, Bevelled, Grooved

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52
Q

To find the travel for a 45 degree straight offset, multiply the amount of offset by:

A

1.141 or square root of 2

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53
Q

How tight should a flare fitting nut be tightened after it’s made finger tight?

A

1/4 turn for tube sizes up to 5/8” and 1/8 turn for sizes over 5/8”

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54
Q

ToF. Victaulic joints are groove and clamp style.

A

True

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55
Q

ToF. Inconel is an example of a material used for the hard face of a mechanical seal.

A

True

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56
Q

Select all the standards used in Canada for pipe

A

ASTM, ISO, API, CSA

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57
Q

ToF. Butt joints are used when using compression packing on a pump shaft

A

True

58
Q

ToF. ORB stands for o-ring boss

A

True

59
Q

ToF. All valves should have pressure and temperature ratings on them

A

True

60
Q

Flareless fittings are also known as compression fittings.

A

True

61
Q

ToF. A diaphragm is a type of flexible moveable gasket

A

True

62
Q

ToF. Safety relief valves are used in gas and steam systems and are vented to atmosphere.

A

False

63
Q

Select the 5 sealing points of mechanical seals.
At the rotating element on the shaft.
Around the outside stationary face.
Between the lantern ring and the ribbon packing.
Between the packing and the stuffing box.
Between the rotating and stationary primary faces.
Between the shaft and sleeve.
Between the gland and the pump housing.
Between the extrusion ring and shaft.

A

At the rotating element on the shaft.
Around the outside stationary face.
Between the rotating and stationary primary faces.
Between the shaft and sleeve.
Between the extrusion ring and shaft.

64
Q

ToF. Flareless fittings are more secure than flared fittings when they are exposed to vibration.

A

True

65
Q

What does a cartridge seal provide?

A

All the necessary sealing components in a pre-assembled unit.

66
Q

ToF. The handle on a ball valve indicated whether it is open or closed.

A

True

67
Q

ToF. Lay lines on a hose are used to determine if the hose has been twisted

A

True

68
Q

What type of pipe threads are used on hydraulic lines?

A

NPS

69
Q

ToF. Most compression packing is infused with some form of lubricant in it’s construction.

A

True

70
Q

What should be taken into consideration in choosing a seal face material?

A

The corrosive properties of the liquid, the temperature and lubricity.

71
Q

Where is the reinforcing put for vacuum hoses?

A

Inside the tube, embedded in the tube, outside the tube

72
Q

What valve can be used for throttling?

A

Globe

73
Q

ToF. Mechanical seals can accommodate some shaft misalignment?

A

True

74
Q

Generally speaking tubing is limited to sizes under how many inches?

A

2

75
Q

Which low speed oil seal can tolerate a lot of end float?

A

V-ring

76
Q

The nearer you position the retainer to the stationary seal ring, the _______ the closing force exerted on the sealing faces

A

Greater

77
Q

Pipes supports should.

A

All of the above

78
Q

Select all the arrangements that can be found for double mechanical seals.

A

Face to Face, Back to Back, Tandem

79
Q

ToF. Valve actuation can be done manually, hydraulically, electrically or pneumatically.

A

True

80
Q

What is the chord length formula for laying out flange gasket holes?

A

Cord length equals bolt circle diameter times a chart factor.

81
Q

Overseas fittings and North American fittings are compatible.

A

False

82
Q

Sealing compound is used on what type of threads?

A

NPT

83
Q

Hydraulic lines should not be made from?

A

Galvanized pipe

84
Q

how are pressure hose sized?

A

by inside diameter in sixteenths given by dash number

85
Q

The purpose of mechanical seal is to prevent leakage around a _____ shaft.

A

Rotating

86
Q

Why should packing always be cut and never spiraled?

A

It creates a spiral leakage path

87
Q

ToF. A diaphragm valve is used primarily is caustic and acid pipelines

A

True

88
Q

ToF. Another name for non-pusher seals is bellows seals.

A

True

89
Q

What are the advantages of non-contacting seals?

A

There is no friction, seal wear and speed limits

90
Q

ToF. A ball valve is fully open when the handle is 90 degrees to the valve body

A

False

91
Q

Hydraulic flared fittings have a flare angle of

A

37 degrees

92
Q

ToF. Diaphragms can be used in valve actuators

A

True

93
Q

ToF. The globe valve has a straight-line flow pattern through it

A

False

94
Q

ToF. The faces of gas lubricated seals do not come into contact with each other while running.

A

True

95
Q

ToF. Vacuum hoses are sized by ID in fractions of an inch.

A

True

96
Q

When undoing flange bolts which one should be loosened first

A

Farthest from you

97
Q

ToF. When used as secondary seal PTFE wedges are designed to be pushed against a rotating carbon face

A

True

98
Q

ToF. Compression packing at times acts as a bearing

A

True

99
Q

ToF. Metric pipe sizes are based on converted standard imperial sizes.

A

True

100
Q

ToF. Lip seals can withstand pressures up to 200 psi

A

False

101
Q

What valve can be used for throttling?

A

Globe

102
Q

How can you minimize contamination due to assembly of pipe joints?

A

Use straight thread ORB fittings

103
Q

ToF. Diaphragm valves can handle temperatures well over 300 deg C

A

False

104
Q

What is the difference between the rating on a pressure hose and the rating on a vacuum hose?

A

Bursting pressure and collapsing point

105
Q

ToF. Poorly supported pipes cause unnecessary stress and breakage.

A

True

106
Q

ToF. PTFE is another term for teflon

A

True

107
Q

ToF. “Balanced” mechanical seals are designed to utilized internal pressure and seal area to negate the effects of discharge pressure on the sealing faces.

A

True

108
Q

ToF. Nominal pipe size and OD are the same thing.

A

False

109
Q

An “o-ring” is an example of a secondary seal in a mechanical seal

A

True

110
Q

What is the purpose of pipe dope?

A

To lubricate the threads when assembling, to seal the spiral leak path

111
Q

ToF. Carbon yarn packing is used in applications where temperature is limited to 315 degrees C

A

True

112
Q

What must primary seal faces be made from?

A

Dissimilar materials

113
Q

ToF. A plug valve requires only a quarter of a turn to open or close fully

A

True

114
Q

How is imperial tube sized?

A

Outside diameter in fractions of an inch, wall thickness in thousandths of an inch, working pressure in psi.

115
Q

Most non-metallic tubing used in pneumatic lines limited to conditions of?

A

Not 145 PSi & 190 Deg F

116
Q

ToF. Gas barrier seals use a stable film of gas in micro grooves to accomplish sealing

A

True

117
Q

What is black iron pipe finish?

A

Coated in lacquer

118
Q

ToF. Welded metal bellows seals can deform at higher speeds.

A

True

119
Q

What does an o-ring extrusion ring do?

A

Prevents p-rings from getting extruded under high pressure

120
Q

How is tubing sized?

A

OD

121
Q

Which of the following is not important when selecting pipe fittings?

A

Same manufacturer as pipe

122
Q

The dimensions in piping system drawings are commonly

A

End to centre?

123
Q

Flared connections that have long-shouldered nuts are used to

A

Provide suport

124
Q

An ORb fitting is used to transition from what?

A

Tapered threads to straight threads

125
Q

ToF. Pressure relief and pressure safey valves open and function by manual operation only.

A

False

126
Q

In general, what are metallic gaskets and seals used for?

A

For higher temperatures and pressures.

127
Q

Select all the reasons hoses are used?
For very cold environments, When connecting moving parts, When extremely high temperatures are involved, When reducing the effects of vibration and shock

A

When connecting moving parts, When reducing the effects of vibration and shock

128
Q

What are two types of closing mechanisms found on pusher seals

A

Single springs and multiple springs

129
Q

Why do pipes have a mill certification?

A

So there is a paper trail if the pipe fails in process to track the problem.
All answers are correct. - Answer!
To ensure you are using the type of steel specified.
To determine the chemical analysis of the steel.

130
Q

A pipe support that prevents vertical pipe from dropping through a floor is called

A

Riser Clamp

131
Q

What is the main difference between single mechanical seals and double mechanical seals?

A

Single seals have one set of primary seals, double seals have two

132
Q

ToF. The design of an angle valve increases the turbulence when compared to the flow pattern of the standard globe valve.

A

False

133
Q

What should be done if fluid can get between a pump shaft and sleeve?

A

Use an o-ring

134
Q

NPT fittings can be resued

A

Depends what for?

135
Q

By what measure are all pipes up to 12” sized?

A

Inside diameter

136
Q

“WSP” refers to the valve’s working steam pressure

A

True

137
Q

What is the purpose of the cover on a pressure hose?

A

To protect the inner hose from abrasion

138
Q

ToF. Butterfly valves can be designed to withstand temperatures over 2000 degrees F

A

True

139
Q

The diameter of metric tube is given in millimeters to how many decimal places?

A

2

140
Q

Aluminum is used a material for metal compression packing

A

True

141
Q

A groove worn in the harder primary seal face is an indicator of what?

A

Dirt particles and contamination have become lodged in the softer seal face because the seal faces have seperated.

142
Q

Why are copper and brass not suitable for hydraulic piping?

A

Accelerate oxidation of the oil.

143
Q
A

Plain Bearings (7 decks)

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