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Steamfitter/Pipefitter > Year 2 > Flashcards

Year 2 Flashcards

1
Q

Group of general rules adopted by a legal jurisdiction and made into law are called:

A

Codes

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2
Q

Documents prepared by a professional group indicating good engineering practices that are optional are called what?

A

Recommended practices

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3
Q

If a 3” pipe is reduced to 1 1/2” how will that affect the velocity of the fluid in the line?

A

Increase velocity by 4 times

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4
Q

The reversal of normal water flow due to negative pressure is called what?

A

Back-siphonage

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5
Q

What is the most effective method of cross-contamination prevention?

A

Use an air-gap

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6
Q

The transfer of energy in the form of waves or particles is referred to as what?

A

Radiation

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7
Q

Baseboard heaters warm a room using what heat transfer method?

A

Convection

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8
Q

An HTU that has a heating element and a cabinet is called what?

A

A convector

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9
Q

How is baseboard radiation rated?

A

BTU’s/Hr./FT

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10
Q

Unit heaters should be how high above the floor?

A

6 to 12 feet

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11
Q

Why are some air-handling units mounted on springs?

A

To isolate vibration

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12
Q

What type of glycol is considered food grade and non-toxic?

A

Propylene glycol

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13
Q

What is the primary purpose of a heating system?

A

Provide individual comfort

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14
Q

What would be the maximum length of serpentine heating circuit if the tube was 3/4 inch?

A

500 ft

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15
Q

What is the heat loss limitation on a series loop system?

A

60-70 MBH

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16
Q

What are two types of hot-water unit heaters?

A

Blow-through/Draw-through

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17
Q

What mechanism holds back steam but allows condensate and gases to pass through it?

A

Steam trap

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18
Q

Too much condensate in a steam line can cause what problem?

A

Water hammer

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19
Q

What type of steam trap is actuated by the differences in temperature between condensate and steam?

A

Thermostatic type

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20
Q

Which steam trap is recommended for a low pressure steam main?

A

F and T

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21
Q

When installed properly, a wire rope clip develops what percent of the wire rope strength?

A

80%

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22
Q

Sections of a cast-iron boiler are drawn together with what?

A

Tie rods

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23
Q

What allows water to travel between sections of a cast-iron boiler?

A

Push nipples/sealing rings

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24
Q

Does an aquastat sense changes of pressure or temperature?

A

Temperature

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25
Q

What mechanism prevents natural circulation on a hydronic heating system?

A

Flow control valves

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26
Q

What is a float operated device that vents air from a hydronic heating system?

A

Automatic air vent

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27
Q

What does a micro bubble reabsorber do?

A

Eliminates air from a hydronic system

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28
Q

What is a ‘lockshield’ valve used for?

A

Prevent unauthorized valve change

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29
Q

How are high temperature hydronic boilers rated?

A

MBH/BHP

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30
Q

What is the purpose of a ‘wild loop’ in a hydronic heating system?

A

Prevents pump deheading

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31
Q

The expansion and contraction of a piping system is controlled with what device(s)?

A

Expansion loop/Joint

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32
Q

What mechanism limits the amount of deflection in a piping system?

A

Pipe guide

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33
Q

A bare pipe resting on a support can be prevented from wear by installing what on the pipe?

A

Wear pad

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34
Q

What device will prevent insulation from being crushed when the pipe is suspended?

A

An insulation saddle

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35
Q

Large heating coils located in air handling units and used to heat or cool an occupied space are called what?

A

Blast coils

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36
Q

A snow melt system requires what component?

A

Heat exchanger (HEX)

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37
Q

Where is the fan located on a vertical unit heater?

A

Middle

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38
Q

What must be installed on a hydronic heating system because of different velocities?

A

Balancing cocks

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39
Q

What is the ideal radiant floor temperature?

A

29 degrees C/85 degrees F

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40
Q

What is one advantage of the reverse return heating system?

A

Easy to balance

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41
Q

How would one describe a 3-way mixing valve?

A

2 inlets - 1 outlet

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42
Q

What is a unit heater often used for in a hydronic heating system?

A

A wild loop

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43
Q

What can be done to prevent radiant tubes from collapsing when covering them with cement?

A

Put 30# test pressure in line

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44
Q

How does increased pressure of a fluid affect the boiling point?

A

Increases boiling point

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45
Q

What causes water hardness?

A

Dissolved minerals

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46
Q

What causes temporary hardness of water?

A

Bicarbonates of sodium and magnesium

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47
Q

The gases in rainwater make the PH above or below 7?

A

Below 7

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48
Q

Where is coagulant added to boiler feedwater to produce “floc”?

A

In the clarifier

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49
Q

The bringing together of various lifting devices to raise or lower a workpiece is called what?

A

Rigging

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50
Q

What section of the ASME code covers unfired pressure vessels?

A

Section VIII

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51
Q

How many imperial gallons are contained in one cubic foot?

A

6.24 gallons

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52
Q

What is one advantage of the ‘gun pakt’ expansion joint?

A

Can be repacked under pressure

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53
Q

What are the most common coagulants in water treatment?

A

Aluminum sulfate/Aluminum hydroxide

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54
Q

How is the strongest fiberglass pipe constructed?

A

It is filament wound

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55
Q

A column of water 1 foot high exerts what pressure at the base?

A

.433 PSI

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56
Q

When working with fiberglass what should never be added to a catalyst?

A

A promoter

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57
Q

What safety equipment should one always wear when working with MEKP?

A

Monogoggles

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58
Q

When using the hand lay-up method of joining FRP pipe which strip should be applied first?

A

The narrow strip

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59
Q

If one doubles the amount of catalyst added to the FRP resin how does that affect gel time?

A

Reduces it by one half

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60
Q

Stainless steel is an alloy made of what metals?

A

Nickel/Chromium/Iron

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61
Q

What is the primary element that gives stainless steel its corrosion resistance?

A

Chromium

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62
Q

With reference to hydronic heating what does the acronym ODT represent?

A

Outdoor Design Temperature

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63
Q

How could one improve heat transfer between steam tracing and the process line?

A

Use heat-conducting paste

64
Q

What is the easiest way to trace small bore vertical pipe?

A

Spiral the tracing around the pipe

65
Q

What information is needed to draw a pipe flange to scale?

A

Actual OD/Bolt circle diameter/Bolt hole diameter

66
Q

At what pipe size do we begin sizing by using the pipe outside diameter?

A

14”

67
Q

What is the formula for calculating the cut-back on a mitered elbow?

A

Cut back = pipe OD x Cut angle factor / 2

68
Q

What can be used to extend straight lines along the length of a pipe?

A

An angle iron

69
Q

How can hi-low be removed from large diameter pipe when welding 2 pieces together?

A

Use pipe dogs

70
Q

What can be used as a brake to help control the position of a load floating on an air cushion?

A

A snubbed line or a tirfor

71
Q

What principle states that “a body, immersed in fluid, loses as much weight as the weight of the fluid is displaces”?

A

Archimedes principle

72
Q

What is the PH of neutral water?

A

7

73
Q

What is the buoyant force on a 5ft^3 box immersed in water?

A

312 IB

74
Q

Is a fire tube boiler considered a high or low mass boiler?

A

High mass

75
Q

What color are PTFE gaskets?

A

White

76
Q

What is the name of a pipe support welded directly to the piping that offers vertical or horizontal support?

A

Dummy leg

77
Q

The second law of thermal dynamics states what?

A

Heat travels from warm to cold

78
Q

The acronym NPS refers to what?

A

Nominal pipe sizing

79
Q

Why would one install a valve on a pipe strainer?

A

To blow down the strainer

80
Q

What post weld treatment is required on nickel alloys to maintain corrosion resistance?

A

Passivating

81
Q

Can anyone erect ‘tube and clamp’ scaffold?

A

Qualified personel

82
Q

What is the maximum length of a scaffold ladder?

A

6.4 meters/21 feet

83
Q

What is used on scaffolds to prevent materials from falling on other workers?

A

Toe boards

84
Q

A fabricated portion of a section of piping including all fittings and flanges is referred to as:

A

Pipe spool

85
Q

The majority of all spools drawings are drawn how?

A

Isometrically

86
Q

If you wanted to see how a piping system would look like from the top what view would you reference?

A

Plot/plan view

87
Q

Which boilers are rated in BTU or EDR?

A

Low pressure steam boilers/LTHW boilers

88
Q

Where is a boilers net rating taken from?

A

The first heat transfer unit

89
Q

An HRT boiler is classified as what type of boiler?

A

Firebox

90
Q

The procedure of unplugging clogged blowdown lines on a boiler is termed what?

A

Rodding

91
Q

What is the most common cause of foaming in a boiler?

A

Dirty boiler water

92
Q

How often should a safety valve on a LP steam heating boiler be tested?

A

Annually

93
Q

What is the function of sand in raw water treatment?

A

Remove turbidity

94
Q

What piping material is used to transport dry chlorine gas?

A

Carbon steel

95
Q

A sodium ion exchange water softener contains what?

A

Zeolite beads

96
Q

What causes a flow control valve to open?

A

Fluid velocity

97
Q

What is the greatest advantage of hydronic heating systems over any other system?

A

Multiple zoning

98
Q

What part of a hotwater circulator transfers energy to the water?

A

The impeller

99
Q

A hydraulic jack with a separate pump that allows for different RAM sizes is called what?

A

Porta pump

100
Q

What is a rule of thumb for calculating the weight of steel pipe?

A

1’x1’x1” thick steel weighs approx. 40lb

101
Q

The ability of a material to withstand 2 equal forces acting in opposite directions is referred to as:

A

Shear strength

102
Q

Shoulder type eyebolts should be used with angular pulls greater than what degree?

A

45”

103
Q

Can PVC pipe be fusion welded?

A

Yes

104
Q

Can PE pipe be solvent welded?

A

No

105
Q

What is the simplest way of making fiberglass pipe and fitting?

A

Hand layup or contact mould method

106
Q

What is the name of strands formed by spinning a quantity of glass fibres together?

A

Rovings

107
Q

How much force is required to properly torque a lock collar?

A

Fingertight

108
Q

The ability of a material to resist forces acting to pull or push the material apart is referred to as:

A

Tensile strength

109
Q

What type of copper is used for heat tracing?

A

Type K and L

110
Q

How can you tell if a chain is suitable for construction lifting?

A

Each link is stamped with a letter or number

111
Q

What is the main contaminant found in surface water?

A

Suspended solids

112
Q

A minimum of how many rollers should be used for moving skid mounted?

A

three

113
Q

Why is ‘special purpose piping’ needed?

A

Corrosion prevention

114
Q

Why does the oil and gas industry prefer plastic piping?

A

Because of possible wax buildup in metal lines

115
Q

Elastomer pipe liners are made from what natural materials?

A

Rubber

116
Q

What material is the least expensive pipe liner?

A

Polypropylene

117
Q

Can lined pipe be welded?

A

Yes provided the lining is not compromised

118
Q

What is another name for ‘catalysts’ used in the fibreglassing process?

A

Hardeners

119
Q

What is the most exotic and expensive piping material used today?

A

Titanium

120
Q

The process of forming an oxide layer on stainless steel is called what?

A

Passivating

121
Q

Should stainless steel piping be stress-relieved?

A

No

122
Q

What type of valve is mounted between flanges and is held in place by flange bolts?

A

The wafer type

123
Q

The control system on a heating boiler should be how many volts?

A

24 volts

124
Q

Rainwater must be treated for what impurities?

A

oxygen/carbon dioxide

125
Q

What is another name for microfiltration?

A

reverse osmosis

126
Q

What hazards might a fitter encounter when working on a demineralizer?

A

Caustic and acid

127
Q

What is used to regenerate sodium zeolite water softeners?

A

brine

128
Q

How do free standing steam radiators transfer heat into a room?

A

using convective currents and radiation

129
Q

What is the term for cold air entering your house through cracks?

A

infiltration heat loss

130
Q

The most used synthetic rope in industry

A

polypropylene

131
Q

What is the strongest synthetic rope?

A

nylon

132
Q

Why is hemp rope not used in industry?

A

may rot under wet conditions

133
Q

The centre of a wire rope is called what?

A

core

134
Q

A worker must wear a harness when over how many metres above the floor?

A

3 metres

135
Q

A rope is attached to a post or ring using what?

A

hitch

136
Q

Why is silicon added to cast iron?

A

corrosion resistance

137
Q

Name one advantage of using glass pipe

A

corrosion resistance

138
Q

How often is a glass piping system supported?

A

at every joint

139
Q

Kimax is what type of pipe?

A

glass

140
Q

What chemical corrodes glass pipe?

A

hydrofluoric acid

141
Q

Low temperature heating boilers are covered under what section of ASME?

A

Section IV

142
Q

List one advantage of the two pipe reverse return heating system

A

equal heat distribution

143
Q

Should a HW circulator pump into or away from a cushion tank?

A

Pump away from

144
Q

List one advantage of a cast-iron boiler

A

it is expandable

145
Q

The PRV in residential hydronic system is set at what pressure?

A

15 PSI

146
Q

What is the most popular plastic pipe for hydronic heating?

A

PEX

147
Q

What is the name of special tees used in a one pipe heating system?

A

Monoflow tees

148
Q

What type of pumps are used in hydronic heating?

A

Centrifical

149
Q

A gauge that indicates temperature pressure and feet of head

A

combination gauge

150
Q

Hotwater EDR is equal to how many BTU’s/HR?

A

150 BTU’s/hr

151
Q

On a hydronic heating system what might be the cause of a weeping relief valve?

A

Waterlogged compression tank

152
Q

The balancing valves on a hydronic system are usually:

A

Globe valves

153
Q

What is the preferred way of attaching a tag line?

A

clove hitch

154
Q

What type of copper tubing is approved for hydronic heating?

A

Type K, L, and M

155
Q

What is the term for helical twists that are put into strands of wirerope?

A

Preforming

Steamfitter/Pipefitter (2 decks)

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