Heating Review

Question 1

Chemical symbol of natural gas

Answer 1

CH4

Question 2

Chemical symbol for propane

Answer 2

C3H8

Question 3

Heating value of natural gas

Answer 3

1000btu/ft³

Question 4

Heating value of propane

Answer 4

2500btu/ft³

Question 5

Specific gravity of natural gas

Answer 5

0.6

Question 6

Limits of flammability for natural gas

Answer 6

5-15% fuel to air percent

Question 7

Relative density of propane liquid

Answer 7

0.51

Question 8

Air required for combustion of natural gas

Answer 8

10x fuel volume

Question 9

Air required for combustion of propane

Answer 9

24x fuel volume

Question 10

Another name for heating value

Answer 10

Calorific value

Question 11

Products of perfect combustion

Answer 11

H20 and CO2

Question 12

What creates aldehides

Answer 12

Incomplete combustion

Question 13

What are the three T’s of combustion?

Answer 13

Time, turbulence and temperature

Question 14

What is theoretical air?

Answer 14

Minimum air based on required ratio

Question 15

What is excess air?

Answer 15

Additional 40% of theoretical air

Question 16

What is total combustion air?

Answer 16

Theoretical + excess air

Question 17

What is the amount of air needed to combust 1Ft³ of methane?

Answer 17

10 ft³

Question 18

What amount of air is needed to combust 1Ft³ of propane?

Answer 18

24Ft³

Question 19

Primary function of a gas burner?

Answer 19

To deliver a gas air mixture

Question 20

The three types of gas burners?

Answer 20

Air mixing, air supply and flame pattern

Question 21

What is an aerated burner?

Answer 21

A burner where fuel and air is mixed upstream of ignition

Question 22

What is an atmospheric burner?

Answer 22

Air is supplied through atmospheric means, not forced induction

Question 23

How does a power burner work

Answer 23

Mechanical induced air and will not turn on until airflow is proven

Question 24

The two types of flame patern burners?

Answer 24

Inshot and upshot

Question 25

What colour of flame indicates incomplete combustion?

Answer 25

Yellow

Question 26

What does an orange flame mean?

Answer 26

Foreign matter or contamination

Question 27

What causes wavering flames?

Answer 27

Drafts or cracked heat exchanger

Question 28

What causes floating flames?

Answer 28

Lack of combustion air Overfired burners Blocked flue Orifice is too large

Question 29

What causes a flame rollout?

Answer 29

Lack of combustion air Blocked flue Burners overfired

Question 30

What causes flashback?

Answer 30

Too much primary air Burners underfired Wrong sized orifice Leaking valve Defective burners

Question 31

What causes the main burner flame to be too large?

Answer 31

Overfired burners Defective regulator Orifice too large Incorrect gas

Question 32

What causes a noisy flame?

Answer 32

Too much primary air Noisy pilot Burr in Orifice

Question 33

What causes fluctuating flames?

Answer 33

Unsteady gas pressure Blocked orifice Defective main gas valve

Question 34

What causes a lifting flame?

Answer 34

Too much primary air Overfired burners Orifice too large

Question 35

What is the boiling point of methane?

Answer 35

-258⁰F

Question 36

What is the boiling point of propane?

Answer 36

-44⁰F

Question 37

What is specific gravity? Aka relative density

Answer 37

How many times heavier or lighter than water

Question 38

Specific gravity of liquid methane?

Answer 38

0.424

Question 39

What is the ignition point of propane gas?

Answer 39

950⁰F

Question 40

What is the ignition point of Natural Gas?

Answer 40

1200⁰F

Question 41

What is the maximum flame temp of natural gas?

Answer 41

3350⁰F

Question 42

What is the maximum flame temp of propane?

Answer 42

3500⁰F

Question 43

What is the flame speed of natural gas?

Answer 43

26"/s

Question 44

What is the flame speed of propane?

Answer 44

32"/s

Question 45

Range of flamibility for natural gas?

Answer 45

5-15%

Question 46

Range of flamibility for propane?

Answer 46

2.3-9.5%