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Gas Theory > 1st year gas theory Year Review > Flashcards

1st year gas theory Year Review Flashcards

1
Q

joints and piping less the 1/2 diameter cant be?

A

concealed

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2
Q

what are the types of copper tubing use for above and below ground for natural and propane gas lines

A

K G L

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3
Q

minimum piping to be stubbed out for ceiling, floor, wall

A

1”, 2”, 1”

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4
Q

34.5 lb/hr X 970 BTU/lb water (latent heat) =

A

33 475 BTU/hr/BHP

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5
Q

what color and name is coated on copper tubing

A

yellow, csst corrugated stainless steel tubing

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6
Q

spacing for gas pipe horizontal

5” - 8”

A

20 ft 6 m

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7
Q

how much heating value is there in 100 cubic ft of propane vapour

A

250 000 Btu

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8
Q

two main types of valves used natural gas and propane

A

ball valve or plug cock

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9
Q

1 lt of water weighs

A

1 kg 1000g

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10
Q

how many BTU required to change 1 lb of steam

A

970 BTU

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11
Q

how are High Temp water boilers rated

A

MBH or BHP and Comply with ASME section 1

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12
Q

what size is an out let on a branch off a main line before knowing what it supplies and left

A

same size as the run (full size)

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13
Q

bushing and be nested

T,F

A

false

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15
Q

atmosphere constants

A

14.7 psia
29.92 in HG
pressure at sea level

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16
Q

a flame that is lifting off the burner ports would be a result of what

A

poorly mixed fuel, to much air being supplied

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17
Q

10 000m would be ________ expressed as km

A

10 km

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18
Q

1 hot water EDR=

A

150 BTU/hr @ 71C (160*F)

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19
Q

when an appliance is not connected to an outlet of a piping system, the outlet must have

A

plug compatable with piping or tubing system/plugged valve/cap`

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20
Q

min. and max range for text gauge for gas testing

A

15% to 300%

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21
Q

Low Temp water boiler max pressure

A

Max 1100 kPa (160 psig)

except CI boilers- max 207 kPa (30 psig)

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22
Q

what must be done before concealing pipe

A

test must be done 15 psig for 15 mins

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23
Q

SI stands for

A

International System of Units

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24
Q

inches of water column for manifold piping

A

3 - 4” wc

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26
Q

min. working pressure of pipe fittings

A

125 psig (made to 150 psig)

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27
Q

boiler ratings

A

begins with the number of sq ft in contact with the products of combustion

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29
Q

ANSI

A

american national standards institute

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30
Q

pressure test and length requirements

for 200’ (60 m) or less

A

15 psig for 15 mins

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31
Q

EDR

A

equivalent direct radiation

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32
Q

conversion of EDR to BTU

A

water BTU= EDR x 150 BTU/hr

steam BTU= EDR x 240 BTU/hr

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33
Q

Define the amount of heat in one British Thermal Unit

A

amount of heat required to change the temperature of one pound of water by one dergree

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35
Q

conversion of BTU to EDR

A

water EDR= BTU/150

steam EDR=BTU/240

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36
Q

Low pressure boiler working psig water/steam

A

30 psig max (water)

15 psig max (steam)

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37
Q

CSST stands for

A

corrugated stainless steel tubing

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38
Q

what pipe fitting cant be use in a system

A

street elbow, street tee, close nipple

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40
Q

4 steel pipe joining methods

A

welded, compressed, threaded, flanged

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40
Q

spacing for gas pipe horizontal

1-1/4” - 2-1/2”

A

10 ft 3 m

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42
Q

EDR (equivalent direct radiation) is

A

amount of heat given off by one sq ft of cast iron radiation= 240 BTU/hr steam @ 1 psi and 215F or 150 BTU/hr water @160F

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43
Q

a bushing shall be made of

A

steel for change of one pipe size or malleable iron for a change of two or more pipe size

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44
Q

How are Low temp water boilers rated

A

BTU/hr or EDR- usually net rated- Comply with ASME section VI

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45
Q

25 kW would be expressed in watts as

A

25 000 W

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46
Q

High temp hot water boiler temperature to start

A

120C (250f)

47
Q

how many ft between identification needs to be on on copper tubing residential and commercial

A

6ft max for residential

20ft for institutional commercial & industrial

47
Q

what 2 types of ways can you test a system

A

air or inert gas (carbon dioxide)

48
Q

one watt equals

A

3.414 Btuh

50
Q

Abbreviation for STP and proper numbers which apply

A

standard temperature pressure 60*F and 14.73 psia

51
Q

spacing for gas pipe horizontal

3” - 4”

A

15 ft 5 m

54
Q

sensible heat

A

energy required to raise a temperature without changing state

55
Q

gross burner output

A

total heat output of the burner available as water or steam

56
Q

psig of gas distribution main line from utility metering

A

50-80 psig

57
Q

define flashback

A

flame at the gas burner burns back to the orifice in the manifold. caused by the gas/air mixture speed being slower than the flame speed

57
Q

what is the min. diameter for a drip pocket

A

min diameter is the piping served to a max of 2” NPS

59
Q

latent heat

A

energy required to change state without changing temperature

60
Q

how many BTU are required to raise the temp of 1 ft cu. of water 1*F

A

62.4 BTU

60
Q

what are pipe fittings constructed of

A

malleable iron or steel

60
Q

inches of water column for service piping

A

7 - 14” wc

60
Q

how long do you test an appliance when carefully watch the test dial on the meter for leaks

A

10 mins

61
Q

what is 1 BHP

A

ability of a boiler to evaporate 34.5 pounds of water per hour

62
Q

min width of test gauge for testing psig

A

min 3”

63
Q

flame lift-off

A

flame at the gas burner lifts off the burner head. caused by mixture speed travelling faster than the flames speed

64
Q

spacing for gas pipe horizontal

3/4”-1”

A

8 ft 2.5 m

65
Q

max gas pressure allowed inside a residential building

A

2 psig

66
Q

abbreviation for CGA

A

Canadian Gas Association

67
Q

60 m3 would weigh _________ kg

A

60 000 kg

68
Q

burner input

A

amount of heat in the fuel burned by the burner

69
Q

head

A

pressure with the height of a column that would exert an equal pressure

70
Q

what would be the cause of a fluctuating flame?

A

to much fuel being supplied to the mixing chamber

70
Q

copper tubing connecting methods are

A

brazed (min. 1000*F)
flared
Brazing is the preferred method for underground

70
Q

ASME

A

american society of mechanical engineers

70
Q

IBR

A

institute of boiler and radiator and radiator manufactures

71
Q

spacing for gas pipe horizontal

10” or larger

A

25 ft 8 m

72
Q

low temp water boilers max temperature

A

Max 120C (250F)

73
Q

minimum grade and operating pressure for steel pipe

A

sch. 40 with 125 psig max

73
Q

pipe T size is sized by

A

first run than branch

74
Q

spacing for gas pipe horizontal

1/2” or less

A

6 ft 2 m

75
Q

1 imperial gallon of water weighs how many lbs

A

10 lbs

76
Q

How many Btu in 1 cubic foot of natural gas

A

1000 Btu

77
Q

How many Btu are there in 10 ft.³ of natural gas

A

10,000 BTU

78
Q

What is meant by the term input rating

A

The number of each do you consumed by the burner when appliance operate for one hour

79
Q

What is meant by the term output rating

A

Amount of useable heat from the combustion process this is the heat that enters the medium being heated

80
Q

Formula for appliance efficiency

A

Appliance efficiency equals output of the appliance over input of the appliance

81
Q

How many BTUs are there in One cubic foot of propane gas

A

2500 BTU

82
Q

Specific gravity liquid of natural gas

A

.424

83
Q

Specific gravity liquid propane

A

. 51

84
Q

Boiling point of natural gas liquids

A

-258 Fahrenheit

85
Q

Boiling point liquid commercial propane

A

-44

86
Q

Latent heat of vaporization natural gas

A

228

87
Q

Latent heat of vaporization commercial propane

A

154

88
Q

Specific heat of liquid BTU/lb natural gas

A

0.18

89
Q

Specific heat of liquid Btu/lb propane

A

0.6

90
Q

Definition of compounds

A

A group/mass of molecules: combination of two or more elements that could be changed by chemical reactions to form another compound

91
Q

Maximum working pressure on residential appliances

A

.5 psig
3 .5 kPa or
14 inches water column 350 mm water column

92
Q

Branch or tee off the main gas line has to be how far from the metre or system regulator

A

2 feet

93
Q

Minimum depth for underground gas line

A

15 inches, 24 inches under commercial driveway

94
Q

I will yellow leaves the flame is a good indication that

A

There’s too much combustion air

95
Q

Carbon monoxide is very dangers of what levels

A

50 ppm

96
Q

For propane installation on first stage and second stage regulator set up what is the working pressure

A

10 psig for first stage

11 inches water column second stage regulator

97
Q

Negative pressure definition

A

Pressure that is below atmospheric pressure

98
Q

Formula for inches of water column to ounces per square inch

A

Water column multiplied by 0.578

To convert inches water column to pound (psig) multiplied by 0.0361

99
Q

Atmospheric pressure in all it’s forms

A

14.7 psi
29.92 inches of mercury 101 kPA
760 mmHg
one bar

100
Q

Formula for power

A

Power equals energy/time

101
Q

1 kW equals how many BTUs an hour

A

3413 BTU an hour

102
Q

One boiler horse power equals how many watts

A

9809.6 W

Gas Theory (1 decks)

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