principles and properties of fuel gases

Question 1

Heat:

Answer 1

energy that causes atoms to move

Question 2

Temperature is…

Answer 2

heat intensity of level of heat of a substance.

Question 3

British thermal unit (BTU)

Answer 3

The amount of energy required to raise the temperature of 1 pound of water 1°F

Question 4

Hydrocarbons

Answer 4

Hydrogen and carbon atoms make up hydrocarbon molecules

Question 5

Example of

liquid hydrocarbon

Answer 5

Number two fuel oil

Question 6

2 fuel oil

__% Carbon __%Hydrogen

Answer 6

85% carbon 15% hydrogen

Question 7

Delivery of fuel (oil and gas) is measured in

Answer 7

Gallons

Question 8

Naturally and propane gas are what type of hydrocarbons

Answer 8

Vapor hydrocarbons

Question 9

Propane’s chemical make-up (C^* H^*)

Answer 9

C³ H⁸

Question 10

Another name for propane (lp)

Answer 10

Liquefied petroleum

Question 11

Natural gas is

__% methane

___% ethane

Answer 11

95% methane

5% ethane

(measured in cu.ft for delivery)

Question 12

Define:

Cubic foot

Answer 12

Amount of gas that would occupy 1 cu. foot of space, at 60°F, saturated with water vapor, and under 30” w.c’s of pressure

Question 13

Higher carbon content

Answer 13

Means more heat and the fuel is closer to a solid-state

Question 14

what does more hydrogen content mean

Answer 14

more efficient but gives off less heat

Question 15

Absolute zero

Answer 15

-460°F

Question 16

Volume of gas

Answer 16

Gas does not have a fixed volume it expands to fill whatever container it is in

Question 17

when a container is full of gas and you continue to fill it what happends?

Answer 17

Additional gas increases pressure and temperature b/c of compressive energy

Question 18

What happens when gas expands

Answer 18

More pressure is exerted on all surfaces of the container

Question 19

Atmospheric pressure

Answer 19

14.7 PSIA (Absolute) (at sea level)

Question 20

Gauge pressure is measured in

Answer 20

(PSI)

a reading of 0 = atmospheric pressure

Pressure above atmospheric will register on the gauge

Question 21

What is water column used for

Answer 21

To measure small pressures above or below atmospheric pressure

Question 22

Water column device

Answer 22

Manometer

Question 23

One PSI is equal to ___ inches of w.c

Answer 23

28”

Question 24

when gas temperature increases the pressure or volume must do what

Answer 24

also increase and vice versa

Question 25

The Pressure of natural gas from service supplier inside the service line before the regulator and meter should be…

Answer 25

8” w.c - 60 psi

Question 26

interchangable names for service line

Answer 26

gas main and distribution line

Question 27

pressure after service regulator and meter

Answer 27

between 3.5” w.c - 8” w.c

Question 28

Pressures inside the building after the inside service regulator should be between __ and ___

Answer 28

3.5” wc - 5” w.c

Question 29

Most appliances want minimum of ___(pressure) going to the gas valve for proper operation and manifold pressure

Answer 29

5” w.c

Question 30

Manifold pressure of a natural gas appliance should be

Answer 30

3.5” w.c

Question 31

Chemical make-up of ethane

Answer 31

C²H⁶

Question 32

chemical make-up of methane

Answer 32

CH⁴

Question 33

When butane is added to propane the chemical make up becomes C* H*

Answer 33

C4 H10