Gas Theory Period 1 (CND) Flashcards
1
Q
3 Common uses of natural gas?
A
Cooking, Heating & Heating Domestic Water
2
Q
3 Uses for liquefied petroleum gas?
A
Heating, Auto. Fuel, & Feed stock for the petrochemical industry.
3
Q
Name of the provincial authority over local gas installation?
A
Alberta Municipal Affairs
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
5
Q
Max gas pressure allowed in a residential dwelling?
A
2 PSIG
6
Q
Piping between the city gate & the buildings?
A
Distribution Lines
7
Q
The piping between the wellhead & processor?
A
Production Lines
8
Q
The piping between the processor & the city gate?
A
transmission Lines
9
Q
What is the function of the CAN/CSA B149.1 Code?
A
To set min. standards & acceptable practices
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.
11
Q
What do you use to give natural gas an odour?
A
Mercaptan
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
13
Q
Regulator nocks down main gas from 12-80psig to ?
A
7” W.C.
14
Q
Gas meter is only measures in _______ not pressure & has ________ chambers in it.
A
Volume & 4
15
Q
What must you run underground on plastic gas pipe?
A
Tracer wire so you can locate the gas line
16
Q
Symbol for propane?
A
C3H8
17
Q
CH4 is?
A
natural gas
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.
19
Q
The function of the Scope in the CAN/CSA B149.1 Code?
A
In indicates where CAN/CSA should & should not apply.
20
Q
2 reasons for sulphur being removed from natural gas?
A
To prevent acid rain & Pipe corrosion.
21
Q
What are naturally occurring products of gas wells?
A
Natural Gas Liquid
22
Q
A burner is used in ?
A
All gas appliances
23
Q
A device that delivers the gas & air to the combustion zone for ignition is a?
A
Burner
24
Q
The burner in a standard storage type domestic water heat is?
A
Aerated, Upshot, Atmospheric Burner
25
A common hand held torch would be considered?
an aerated burner
26
the part of the mixing assembly that has the smallest diameter is?
the mixer throat
27
Never exceed _____% over the rating on the plate.
3%
28
Pressure at sea level is?
14.7 psia
29
Gas burner are categorized by three characteristics ?
Air Mixing, Flame Pattern & Air Supply
30
What product creates a main concern when incomplete combustion occurs?
Carbon monoxide
31
Underground piping or tubing shall not pass below____.
A foundation, wall or under a building
32
The specific gravity of propane liquid is?
.51
33
Who is responsible for the installation and maintenance of piping & equipment up the gas meter?
the gas utility
34
the atmosphere is made up of what percentage of nitrogen ?
79%
35
What is the ignition temperature of natural gas?
1200 F
36
True or False: natural rubber maybe used as a gasket material?
False
37
What does the appliance input rating represent?
the max allowable appliance gas cmsumption.
38
12 millivolts would read as what in volts?
,012 volts (12/1000=.012)
39
1 Joule of energy released in one second is equal to ?
1 watt
40
the unit of pressure in SI is?
The Pascal
41
A pipe full of water with a height of 10m will have a pressure of _____KPA at the bottom?
98kpa
42
How many KJ are needed to raise the temperature of 1 kilogram of H2O 1 Degree Celsius?
4.2KJ
43
A joint of steel piping over 2" NPS must be?
Welded
44
What 2 materials can be used if steel pipe is required for gas lines?
Black & Galvanized Steel.
45
Part of the gas piping system that conducts gas down t the appliance is called?
The Drop
46
What is the proper procedure to follow when connecting appliances to a newly installed piping system?
Test with air for any leaks, Purge, & then light the appliance.
47
The finish piping has to be tested at ?
working pressure for 10mins.
48
True or False: A gas meter must always be installed outside?
False
49
The part of the building supply piping installed to collect moisture is?
the Drip Leg.
50
A drip must be located at the bottom of a drip serving?
A furnace.
51
A lubricated main shut off is used?
Upstream of the gas meter
52
The diameter of a drip installed in a gas piping system shall be?
Not less than the diameter of the piping it serves or NPS 2 whichever is less.
53
The building supply piping is found?
Down stream of the meter or second stage regulator
54
3 ways to check for leaks during a pressure test?
Meter test dials, Soap & water, & An manometer
55
What procedure should be followed if no meter is used & the gas is being turned on for the first time?
The air should be bled out through the most remote outlet.
56
Specific Gravity of liquid propane?
.51
57
The boiling point of natural gas?
So low we do not even worry about it.
58
A cubic meter of gas, measured at S.T.P is at a pressure of?
101 kpa
59
SOOT is produced by?
lack of primary air
60
How much oxygen is used for combustion?
20% makes up the air used
61
When a fuel gas is burned completely it will make?
water
62
3 factors necessary for combustion?
Air, Heat & Fuel
63
When a substance is combined with oxygen the process is called?
oxidation
64
Combustion is best described as?
Rapid oxidation
65
A column of water 12" high will exert a pressure of ?
.434 PSIG
66
True or False: Standing line pressure can be taken anywhere along the line?
True
67
A pressure of 1 psig is equivalent to what in W.C.?
28" W.C.
68
True or False: Pressure has no effect on the rate of flow in a gas line?
False
69
Gas flow in a piping system is due to?
Pressure differences
70
Which of the following scales are used in a monometer?
Inches of water & Ounces per squares inch
71
What refers to the liquid surface in the manometer?
Meniscus
72
Reading taken in a line supplying propane to a kitchen range should be?
11" W.C.
73
The max allowable difference in operating pressure between the meter and the appliance is?
Called Pressure Drop
74
The main purpose of a gas burner is to ?
Mix the air & gas
75
Flame coming off the burner horizontal is?
An Inshot Burner
76
A burner with air openings into the body of the burner would be considered?
Aerated
77
Operation used by an aerate, atmospheric in shot burner is know as the?
Venturi Effect
78
The pressure inside the mixer head during operation is ?
Slightly less then atmospheric
79
Part of the mixing assembly that has the smallest diameter is the?
Mixer throat
80
The location of the venture is usually between the?
Mixer Head & Mixer Tube
81
The main purpose of the mixer throat?
Aid in the entrainment of the air
82
The primary purpose of the air shutter in an aerated type of burner is to?
regulate the flow of primary air
83
Propane tends to release energy at a rate of approximately ______ times that of natural gas.
2.5 times
84
The minimum length(depth) of a dirt pocket installed on a gas appliance is _______ inches
3"
85
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:
the pilot flame is too small
86
Regulations that govern fuel-fired equipment are a ________ responsibility.
provincial
87
Cooling it to ______ degrees Celsius can liquefy natural gas.
-161*C
88
The salt caverns that are used to store natural gas near Fort Saskatchewan are ______ m deep.
1800m
89
If a manometer that you purchased is said to be a direct reading measuring device then the gas being measured is:
in direct contact with the measuring liquid.
90
When using a U-tube manometer the meniscus of the liquid is used as the reference point. The meniscus of the liquid is the?
curve at the top of the liquid.
91
A comparison of a volume of a substance compared to an equal volume of water.
specific gravity
92
What are the characteristics of a liquid state?
Definite volume, Definite mass, Indefinite shape.
93
What is the density of air at STP?
0.076 lbs/ft³
94
What is the density and the specific gravity of water in oz/in³.
0.578 oz/in³ and 1
95
What does the chemical symbol CO represent?
Carbon monoxide
96
What is the standard atmospheric pressure boiling temperature for propane liquid?
-44ºF
97
What is the standard atmospheric pressure boiling temperature for Liquefied natural gas?
-258ºF
98
What is the standard atmospheric pressure boiling temperature for butane liquid?
32ºF
99
What is the flame temperature of propane?
3500˚F
100
What is the ignition temperature of propane?
950˚F
101
What is the flame temperature of Natural gas?
3350˚F
102
What is the ignition temperature of Natural gas?
1200˚F
103
True or False: The air required to completely burn the fuel is defined as excess air?
False
104
The gas/air mixture speed exceeds the flame speed resulting in a flame that burns too high above the burner is defined as?
Lift Off
105
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?
Flashback
106
Combustion that does not convert all the carbon and/or hydrogen into water vapour and/or carbon dioxide is defined as?
Incomplete combustion
107
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?
Secondary air
108
What does the appliance output represent?
Useable heat produced by the appliance.
109
What does the altitude rating for an appliance indicate to the gasfitter?
It indicated elevation input certification.
110
What factor is used for de-rating an appliance that is to be installed above high altitude?
The factor used is De-rate 4% per 1000 feet above 4500 ft.
111
What does the appliance input rating represent?
The maximum allowable appliance gas consumption.
112
negative pressure created by the Venturi effect to entrain the primary air would be called?
Atmospheric In Shot & Up shot burner
113
The flame at the gas burner is changing height rapidly, (the flame bounces) is defined as?
Flame oscillation
114
3 basic flame type that can be produced by adjusting the primary air on an aerated burner?
Carbonizing or carburizing, Neutral, & Oxidizing
115
6 main factors that affect pressure drop?
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
True or False: An increase in gas flow will result in a decrease of pressure drop
False
117
What two tests are done to determine pressure drop?
Standing line and operating test
118
True or False: Pressure drop is also referred to as pressure loss and pressure differential.
True
119
How would an undersized gas line be identified?
If the pressure drop exceeds one inch water column
120
What measurement system is used to enforce Code requirements?
Imperial
121
At what point does the gasfitter's jurisdiction start in a gas supply piping system?
At the outlet of the gas meter or/and downstream of the supplier's tank on a propane system
122
When may the CAN/CSA B149.1-10 Natural Gas and Propane Installation Code be applied to mobile homes?
When structural alterations made to the unit render it no longer suitable for road worthiness.
123
What elevation qualifies as high altitude for appliances, and what is the input reduction factor when appliances are installed above high altitude?
2000 to 4500 feet above sea level and de-rate by 10%
124
What is the minimum dimension for accessibility to an appliance through a passageway?
36 inches x 36 inches
125
What is the minimum dimension for accessibility to an appliance through an opening?
24 inches x 30 inches
126
What is the minimum required distance between a source of ignition on an appliance and floor level in a storage garage?
18 inches
127
What is the minimum required distance between a source of ignition on an appliance and floor level in a repair garage?
54 inches
128
Threaded Schedule 40 steel piping may be used for pressures not exceeding _____.
125 PSI
129
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?
false
130
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.
False
131
What is the maximum length of a metal connector for a range?
6ft
132
For a portable appliance, a hose shall not exceed 75 feet in length.
false
133
A hose shall not be subjected to temperatures greater than ______.
125*F
134
Close nipple is one that?
has none of the original wall thickness left
135
Type G copper can only be used on?
Above ground work
136
Volatile is used in reference to?
How easy gas mixes with air
137
In their natural states CH4 & C3H8 gases @ STP are?
Hydrocarbons
138
The part of the natural gas piping system the gasfitter can work on is?
Only down stream of the meter
139
Which of the following can be used to test natural gas piping?
Air, Nitrogen & Carbon Dioxide
140
Min. diameter gauge that can be used for testing gas lines?
3"
141
A leak on a propane cylinder valve should be located with?
An approved liquid leak detector
142
The most likely place to find a flammable mixture of gas if there is a substance leak is?
near the edge of the gas cloud
143
To control the volume of gas flow?
An oriface
144
A fluctuating flame on an aerated burner is most likely cause by?
Problem with the gas pressure regulator.
145
In Alberta, type G copper tubing can be used on?
Natural gas & Propane gas lines above ground
146
A malleable iron fitting in a gas piping system?
Is more flexible than a cast iron fitting.
147
The outlet pressure of a regulator is determined by?
The spring adjustment
148
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?
That there is too much restriction in the gas supply line to the appliance.
149
Carbon monoxide is lethal at a concentration of?
4000ppm for 1 hr
150
Which of the products of good combustion is considered to be a green house gas?
CO2 (Carbon dioxide)
