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Plumbing/Gasfitting Period 1 (CND) > Gas Theory Period 1 (CND) > Flashcards

Gas Theory Period 1 (CND) Flashcards

1
Q

3 Common uses of natural gas?

A

Cooking, Heating & Heating Domestic Water

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2
Q

3 Uses for liquefied petroleum gas?

A

Heating, Auto. Fuel, & Feed stock for the petrochemical industry.

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3
Q

Name of the provincial authority over local gas installation?

A

Alberta Municipal Affairs

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4
Q

What is the name & where can you find regulations that govern gas installations?

A

Natural Gas & Propane installation code CAN/CSA B149.1

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5
Q

Max gas pressure allowed in a residential dwelling?

A

2 PSIG

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6
Q

Piping between the city gate & the buildings?

A

Distribution Lines

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7
Q

The piping between the wellhead & processor?

A

Production Lines

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8
Q

The piping between the processor & the city gate?

A

transmission Lines

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9
Q

What is the function of the CAN/CSA B149.1 Code?

A

To set min. standards & acceptable practices

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10
Q

What is the function of the bulletins & STANDATAS issued to the CAN/CSA 149.1 code?

A

to provide amendments & interpretation of the CAN/CSA - B149.1 in relationship to safety & installation requirements for Alberta.

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11
Q

What do you use to give natural gas an odour?

A

Mercaptan

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12
Q

Transmission pressures maybe as high as 1500psi, the local utility may use 3 pressure systems and they are?

A

Low Pressure System - 8” to 14” W.C
Intermediate Pressure System - 2psig to 80 psig
High Pressure System - 80psig to 300psig

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13
Q

Regulator nocks down main gas from 12-80psig to ?

A

7” W.C.

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14
Q

Gas meter is only measures in _______ not pressure & has ________ chambers in it.

A

Volume & 4

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15
Q

What must you run underground on plastic gas pipe?

A

Tracer wire so you can locate the gas line

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16
Q

Symbol for propane?

A

C3H8

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17
Q

CH4 is?

A

natural gas

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18
Q

The function of the preface section in the CAN/CSA B141.1 Code?

A

To supply background on CAN/CSA B149.1 Code.

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19
Q

The function of the Scope in the CAN/CSA B149.1 Code?

A

In indicates where CAN/CSA should & should not apply.

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20
Q

2 reasons for sulphur being removed from natural gas?

A

To prevent acid rain & Pipe corrosion.

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21
Q

What are naturally occurring products of gas wells?

A

Natural Gas Liquid

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22
Q

A burner is used in ?

A

All gas appliances

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23
Q

A device that delivers the gas & air to the combustion zone for ignition is a?

A

Burner

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24
Q

The burner in a standard storage type domestic water heat is?

A

Aerated, Upshot, Atmospheric Burner

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25
Q

A common hand held torch would be considered?

A

an aerated burner

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26
Q

the part of the mixing assembly that has the smallest diameter is?

A

the mixer throat

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27
Q

Never exceed _____% over the rating on the plate.

A

3%

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28
Q

Pressure at sea level is?

A

14.7 psia

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29
Q

Gas burner are categorized by three characteristics ?

A

Air Mixing, Flame Pattern & Air Supply

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30
Q

What product creates a main concern when incomplete combustion occurs?

A

Carbon monoxide

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31
Q

Underground piping or tubing shall not pass below____.

A

A foundation, wall or under a building

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32
Q

The specific gravity of propane liquid is?

A

.51

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33
Q

Who is responsible for the installation and maintenance of piping & equipment up the gas meter?

A

the gas utility

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34
Q

the atmosphere is made up of what percentage of nitrogen ?

A

79%

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35
Q

What is the ignition temperature of natural gas?

A

1200 F

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36
Q

True or False: natural rubber maybe used as a gasket material?

A

False

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37
Q

What does the appliance input rating represent?

A

the max allowable appliance gas cmsumption.

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38
Q

12 millivolts would read as what in volts?

A

,012 volts (12/1000=.012)

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39
Q

1 Joule of energy released in one second is equal to ?

A

1 watt

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40
Q

the unit of pressure in SI is?

A

The Pascal

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41
Q

A pipe full of water with a height of 10m will have a pressure of _____KPA at the bottom?

A

98kpa

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42
Q

How many KJ are needed to raise the temperature of 1 kilogram of H2O 1 Degree Celsius?

A

4.2KJ

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43
Q

A joint of steel piping over 2” NPS must be?

A

Welded

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44
Q

What 2 materials can be used if steel pipe is required for gas lines?

A

Black & Galvanized Steel.

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45
Q

Part of the gas piping system that conducts gas down t the appliance is called?

A

The Drop

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46
Q

What is the proper procedure to follow when connecting appliances to a newly installed piping system?

A

Test with air for any leaks, Purge, & then light the appliance.

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47
Q

The finish piping has to be tested at ?

A

working pressure for 10mins.

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48
Q

True or False: A gas meter must always be installed outside?

A

False

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49
Q

The part of the building supply piping installed to collect moisture is?

A

the Drip Leg.

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50
Q

A drip must be located at the bottom of a drip serving?

A

A furnace.

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51
Q

A lubricated main shut off is used?

A

Upstream of the gas meter

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52
Q

The diameter of a drip installed in a gas piping system shall be?

A

Not less than the diameter of the piping it serves or NPS 2 whichever is less.

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53
Q

The building supply piping is found?

A

Down stream of the meter or second stage regulator

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54
Q

3 ways to check for leaks during a pressure test?

A

Meter test dials, Soap & water, & An manometer

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55
Q

What procedure should be followed if no meter is used & the gas is being turned on for the first time?

A

The air should be bled out through the most remote outlet.

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56
Q

Specific Gravity of liquid propane?

A

.51

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57
Q

The boiling point of natural gas?

A

So low we do not even worry about it.

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58
Q

A cubic meter of gas, measured at S.T.P is at a pressure of?

A

101 kpa

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59
Q

SOOT is produced by?

A

lack of primary air

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60
Q

How much oxygen is used for combustion?

A

20% makes up the air used

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61
Q

When a fuel gas is burned completely it will make?

A

water

62
Q

3 factors necessary for combustion?

A

Air, Heat & Fuel

63
Q

When a substance is combined with oxygen the process is called?

A

oxidation

64
Q

Combustion is best described as?

A

Rapid oxidation

65
Q

A column of water 12” high will exert a pressure of ?

A

.434 PSIG

66
Q

True or False: Standing line pressure can be taken anywhere along the line?

A

True

67
Q

A pressure of 1 psig is equivalent to what in W.C.?

A

28” W.C.

68
Q

True or False: Pressure has no effect on the rate of flow in a gas line?

A

False

69
Q

Gas flow in a piping system is due to?

A

Pressure differences

70
Q

Which of the following scales are used in a monometer?

A

Inches of water & Ounces per squares inch

71
Q

What refers to the liquid surface in the manometer?

A

Meniscus

72
Q

Reading taken in a line supplying propane to a kitchen range should be?

A

11” W.C.

73
Q

The max allowable difference in operating pressure between the meter and the appliance is?

A

Called Pressure Drop

74
Q

The main purpose of a gas burner is to ?

A

Mix the air & gas

75
Q

Flame coming off the burner horizontal is?

A

An Inshot Burner

76
Q

A burner with air openings into the body of the burner would be considered?

A

Aerated

77
Q

Operation used by an aerate, atmospheric in shot burner is know as the?

A

Venturi Effect

78
Q

The pressure inside the mixer head during operation is ?

A

Slightly less then atmospheric

79
Q

Part of the mixing assembly that has the smallest diameter is the?

A

Mixer throat

80
Q

The location of the venture is usually between the?

A

Mixer Head & Mixer Tube

81
Q

The main purpose of the mixer throat?

A

Aid in the entrainment of the air

82
Q

The primary purpose of the air shutter in an aerated type of burner is to?

A

regulate the flow of primary air

83
Q

Propane tends to release energy at a rate of approximately ______ times that of natural gas.

A

2.5 times

84
Q

The minimum length(depth) of a dirt pocket installed on a gas appliance is _______ inches

A

3”

85
Q

You are called to service an appliance. The customer complains that the flame explodes every time ignition occurs. A possible cause for this problem is:

A

the pilot flame is too small

86
Q

Regulations that govern fuel-fired equipment are a ________ responsibility.

A

provincial

87
Q

Cooling it to ______ degrees Celsius can liquefy natural gas.

A

-161*C

88
Q

The salt caverns that are used to store natural gas near Fort Saskatchewan are ______ m deep.

A

1800m

89
Q

If a manometer that you purchased is said to be a direct reading measuring device then the gas being measured is:

A

in direct contact with the measuring liquid.

90
Q

When using a U-tube manometer the meniscus of the liquid is used as the reference point. The meniscus of the liquid is the?

A

curve at the top of the liquid.

91
Q

A comparison of a volume of a substance compared to an equal volume of water.

A

specific gravity

92
Q

What are the characteristics of a liquid state?

A

Definite volume, Definite mass, Indefinite shape.

93
Q

What is the density of air at STP?

A

0.076 lbs/ft³

94
Q

What is the density and the specific gravity of water in oz/in³.

A

0.578 oz/in³ and 1

95
Q

What does the chemical symbol CO represent?

A

Carbon monoxide

96
Q

What is the standard atmospheric pressure boiling temperature for propane liquid?

A

-44ºF

97
Q

What is the standard atmospheric pressure boiling temperature for Liquefied natural gas?

A

-258ºF

98
Q

What is the standard atmospheric pressure boiling temperature for butane liquid?

A

32ºF

99
Q

What is the flame temperature of propane?

A

3500˚F

100
Q

What is the ignition temperature of propane?

A

950˚F

101
Q

What is the flame temperature of Natural gas?

A

3350˚F

102
Q

What is the ignition temperature of Natural gas?

A

1200˚F

103
Q

True or False: The air required to completely burn the fuel is defined as excess air?

A

False

104
Q

The gas/air mixture speed exceeds the flame speed resulting in a flame that burns too high above the burner is defined as?

A

Lift Off

105
Q

The gas/air mixture is slower than the flame speed causing the flame to burn inside the burner, possibly at the orifice is defined as?

A

Flashback

106
Q

Combustion that does not convert all the carbon and/or hydrogen into water vapour and/or carbon dioxide is defined as?

A

Incomplete combustion

107
Q

Air required for the intermediate and final stages of the combustion process and is added to the flame to produce complete combustion is defined as?

A

Secondary air

108
Q

What does the appliance output represent?

A

Useable heat produced by the appliance.

109
Q

What does the altitude rating for an appliance indicate to the gasfitter?

A

It indicated elevation input certification.

110
Q

What factor is used for de-rating an appliance that is to be installed above high altitude?

A

The factor used is De-rate 4% per 1000 feet above 4500 ft.

111
Q

What does the appliance input rating represent?

A

The maximum allowable appliance gas consumption.

112
Q

negative pressure created by the Venturi effect to entrain the primary air would be called?

A

Atmospheric In Shot & Up shot burner

113
Q

The flame at the gas burner is changing height rapidly, (the flame bounces) is defined as?

A

Flame oscillation

114
Q

3 basic flame type that can be produced by adjusting the primary air on an aerated burner?

A

Carbonizing or carburizing, Neutral, & Oxidizing

115
Q

6 main factors that affect pressure drop?

A

1) Fittings and valves
2) Length of pipe
3) Type of pipe (material it is constructed of)
4) Initial gas pressure
5) Type of gas (specific gravity)
6) Volume of gases flowing

116
Q

True or False: An increase in gas flow will result in a decrease of pressure drop

A

False

117
Q

What two tests are done to determine pressure drop?

A

Standing line and operating test

118
Q

True or False: Pressure drop is also referred to as pressure loss and pressure differential.

A

True

119
Q

How would an undersized gas line be identified?

A

If the pressure drop exceeds one inch water column

120
Q

What measurement system is used to enforce Code requirements?

A

Imperial

121
Q

At what point does the gasfitter’s jurisdiction start in a gas supply piping system?

A

At the outlet of the gas meter or/and downstream of the supplier’s tank on a propane system

122
Q

When may the CAN/CSA B149.1-10 Natural Gas and Propane Installation Code be applied to mobile homes?

A

When structural alterations made to the unit render it no longer suitable for road worthiness.

123
Q

What elevation qualifies as high altitude for appliances, and what is the input reduction factor when appliances are installed above high altitude?

A

2000 to 4500 feet above sea level and de-rate by 10%

124
Q

What is the minimum dimension for accessibility to an appliance through a passageway?

A

36 inches x 36 inches

125
Q

What is the minimum dimension for accessibility to an appliance through an opening?

A

24 inches x 30 inches

126
Q

What is the minimum required distance between a source of ignition on an appliance and floor level in a storage garage?

A

18 inches

127
Q

What is the minimum required distance between a source of ignition on an appliance and floor level in a repair garage?

A

54 inches

128
Q

Threaded Schedule 40 steel piping may be used for pressures not exceeding _____.

A

125 PSI

129
Q

True or False: Finish piping and appliance connections shall be checked under test pressure with either a/an soap solution or a/an leak detection device?

A

false

130
Q

True or False: When a piping system is purged outdoors, the purge point must not terminate closer than 3 feet from a building or air intake.

A

False

131
Q

What is the maximum length of a metal connector for a range?

A

6ft

132
Q

For a portable appliance, a hose shall not exceed 75 feet in length.

A

false

133
Q

A hose shall not be subjected to temperatures greater than ______.

A

125*F

134
Q

Close nipple is one that?

A

has none of the original wall thickness left

135
Q

Type G copper can only be used on?

A

Above ground work

136
Q

Volatile is used in reference to?

A

How easy gas mixes with air

137
Q

In their natural states CH4 & C3H8 gases @ STP are?

A

Hydrocarbons

138
Q

The part of the natural gas piping system the gasfitter can work on is?

A

Only down stream of the meter

139
Q

Which of the following can be used to test natural gas piping?

A

Air, Nitrogen & Carbon Dioxide

140
Q

Min. diameter gauge that can be used for testing gas lines?

A

3”

141
Q

A leak on a propane cylinder valve should be located with?

A

An approved liquid leak detector

142
Q

The most likely place to find a flammable mixture of gas if there is a substance leak is?

A

near the edge of the gas cloud

143
Q

To control the volume of gas flow?

A

An oriface

144
Q

A fluctuating flame on an aerated burner is most likely cause by?

A

Problem with the gas pressure regulator.

145
Q

In Alberta, type G copper tubing can be used on?

A

Natural gas & Propane gas lines above ground

146
Q

A malleable iron fitting in a gas piping system?

A

Is more flexible than a cast iron fitting.

147
Q

The outlet pressure of a regulator is determined by?

A

The spring adjustment

148
Q

An operating line pressure at the meter of 7” WC and an operating line pressure of 5.8” WC at the appliance drip pocket would mean?

A

That there is too much restriction in the gas supply line to the appliance.

149
Q

Carbon monoxide is lethal at a concentration of?

A

4000ppm for 1 hr

150
Q

Which of the products of good combustion is considered to be a green house gas?

A

CO2 (Carbon dioxide)

Plumbing/Gasfitting Period 1 (CND) (6 decks)

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