1st year gas theory Year Review

Question 1

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

Answer 1

concealed

Question 2

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

Answer 2

K G L

Question 3

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

Answer 3

1”, 2”, 1”

Question 4

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

Answer 4

33 475 BTU/hr/BHP

Question 5

what color and name is coated on copper tubing

Answer 5

yellow, csst corrugated stainless steel tubing

Question 6

spacing for gas pipe horizontal

5” - 8”

Answer 6

20 ft 6 m

Question 7

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

Answer 7

250 000 Btu

Question 8

two main types of valves used natural gas and propane

Answer 8

ball valve or plug cock

Question 9

1 lt of water weighs

Answer 9

1 kg 1000g

Question 10

how many BTU required to change 1 lb of steam

Answer 10

970 BTU

Question 11

how are High Temp water boilers rated

Answer 11

MBH or BHP and Comply with ASME section 1

Question 12

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

Answer 12

same size as the run (full size)

Question 13

bushing and be nested

T,F

Answer 13

false

Question 15

atmosphere constants

Answer 15

14.7 psia
29.92 in HG
pressure at sea level

Question 16

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

Answer 16

poorly mixed fuel, to much air being supplied

Question 17

10 000m would be ________ expressed as km

Answer 17

10 km

Question 18

1 hot water EDR=

Answer 18

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

Question 19

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

Answer 19

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

Question 20

min. and max range for text gauge for gas testing

Answer 20

15% to 300%

Question 21

Low Temp water boiler max pressure

Answer 21

Max 1100 kPa (160 psig)

except CI boilers- max 207 kPa (30 psig)

Question 22

what must be done before concealing pipe

Answer 22

test must be done 15 psig for 15 mins

Question 23

SI stands for

Answer 23

International System of Units

Question 24

inches of water column for manifold piping

Answer 24

3 - 4” wc

Question 26

min. working pressure of pipe fittings

Answer 26

125 psig (made to 150 psig)

Question 27

boiler ratings

Answer 27

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

Question 29

ANSI

Answer 29

american national standards institute

Question 30

pressure test and length requirements | for 200' (60 m) or less

Answer 30

15 psig for 15 mins

Question 31

EDR

Answer 31

equivalent direct radiation

Question 32

conversion of EDR to BTU

Answer 32

water BTU= EDR x 150 BTU/hr | steam BTU= EDR x 240 BTU/hr

Question 33

Define the amount of heat in one British Thermal Unit

Answer 33

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

Question 35

conversion of BTU to EDR

Answer 35

water EDR= BTU/150 | steam EDR=BTU/240

Question 36

Low pressure boiler working psig water/steam

Answer 36

30 psig max (water) | 15 psig max (steam)

Question 37

CSST stands for

Answer 37

corrugated stainless steel tubing

Question 38

what pipe fitting cant be use in a system

Answer 38

street elbow, street tee, close nipple

Question 40

4 steel pipe joining methods

Answer 40

welded, compressed, threaded, flanged

Question 40

spacing for gas pipe horizontal | 1-1/4" - 2-1/2"

Answer 40

10 ft 3 m

Question 42

EDR (equivalent direct radiation) is

Answer 42

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

Question 43

a bushing shall be made of

Answer 43

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

Question 44

How are Low temp water boilers rated

Answer 44

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

Question 45

25 kW would be expressed in watts as

Answer 45

25 000 W

Question 46

High temp hot water boiler temperature to start

Answer 46

120*C (250*f)

Question 47

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

Answer 47

6ft max for residential | 20ft for institutional commercial & industrial

Question 47

what 2 types of ways can you test a system

Answer 47

air or inert gas (carbon dioxide)

Question 48

one watt equals

Answer 48

3.414 Btuh

Question 50

Abbreviation for STP and proper numbers which apply

Answer 50

standard temperature pressure 60*F and 14.73 psia

Question 51

spacing for gas pipe horizontal | 3" - 4"

Answer 51

15 ft 5 m

Question 54

sensible heat

Answer 54

energy required to raise a temperature without changing state

Question 55

gross burner output

Answer 55

total heat output of the burner available as water or steam

Question 56

psig of gas distribution main line from utility metering

Answer 56

50-80 psig

Question 57

define flashback

Answer 57

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

Question 57

what is the min. diameter for a drip pocket

Answer 57

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

Question 59

latent heat

Answer 59

energy required to change state without changing temperature

Question 60

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

Answer 60

62.4 BTU

Question 60

what are pipe fittings constructed of

Answer 60

malleable iron or steel

Question 60

inches of water column for service piping

Answer 60

7 - 14" wc

Question 60

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

Answer 60

10 mins

Question 61

what is 1 BHP

Answer 61

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

Question 62

min width of test gauge for testing psig

Answer 62

min 3"

Question 63

flame lift-off

Answer 63

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

Question 64

spacing for gas pipe horizontal | 3/4"-1"

Answer 64

8 ft 2.5 m

Question 65

max gas pressure allowed inside a residential building

Answer 65

2 psig

Question 66

abbreviation for CGA

Answer 66

Canadian Gas Association

Question 67

60 m3 would weigh _________ kg

Answer 67

60 000 kg

Question 68

burner input

Answer 68

amount of heat in the fuel burned by the burner

Question 69

head

Answer 69

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

Question 70

what would be the cause of a fluctuating flame?

Answer 70

to much fuel being supplied to the mixing chamber

Question 70

copper tubing connecting methods are

Answer 70

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

Question 70

ASME

Answer 70

american society of mechanical engineers

Question 70

IBR

Answer 70

institute of boiler and radiator and radiator manufactures

Question 71

spacing for gas pipe horizontal | 10" or larger

Answer 71

25 ft 8 m

Question 72

low temp water boilers max temperature

Answer 72

Max 120*C (250*F)

Question 73

minimum grade and operating pressure for steel pipe

Answer 73

sch. 40 with 125 psig max

Question 73

pipe T size is sized by

Answer 73

first run than branch

Question 74

spacing for gas pipe horizontal | 1/2" or less

Answer 74

6 ft 2 m

Question 75

1 imperial gallon of water weighs how many lbs

Answer 75

10 lbs

Question 76

How many Btu in 1 cubic foot of natural gas

Answer 76

1000 Btu

Question 77

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

Answer 77

10,000 BTU

Question 78

What is meant by the term input rating

Answer 78

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

Question 79

What is meant by the term output rating

Answer 79

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

Question 80

Formula for appliance efficiency

Answer 80

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

Question 81

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

Answer 81

2500 BTU

Question 82

Specific gravity liquid of natural gas

Answer 82

.424

Question 83

Specific gravity liquid propane

Answer 83

. 51

Question 84

Boiling point of natural gas liquids

Answer 84

-258 Fahrenheit

Question 85

Boiling point liquid commercial propane

Answer 85

-44

Question 86

Latent heat of vaporization natural gas

Answer 86

228

Question 87

Latent heat of vaporization commercial propane

Answer 87

154

Question 88

Specific heat of liquid BTU/lb natural gas

Answer 88

0.18

Question 89

Specific heat of liquid Btu/lb propane

Answer 89

0.6

Question 90

Definition of compounds

Answer 90

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

Question 91

Maximum working pressure on residential appliances

Answer 91

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

Question 92

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

Answer 92

2 feet

Question 93

Minimum depth for underground gas line

Answer 93

15 inches, 24 inches under commercial driveway

Question 94

I will yellow leaves the flame is a good indication that

Answer 94

There's too much combustion air

Question 95

Carbon monoxide is very dangers of what levels

Answer 95

50 ppm

Question 96

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

Answer 96

10 psig for first stage | 11 inches water column second stage regulator

Question 97

Negative pressure definition

Answer 97

Pressure that is below atmospheric pressure

Question 98

Formula for inches of water column to ounces per square inch

Answer 98

Water column multiplied by 0.578 To convert inches water column to pound (psig) multiplied by 0.0361

Question 99

Atmospheric pressure in all it's forms

Answer 99

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

Question 100

Formula for power

Answer 100

Power equals energy/time

Question 101

1 kW equals how many BTUs an hour

Answer 101

3413 BTU an hour

Question 102

One boiler horse power equals how many watts

Answer 102

9809.6 W