Chapter C Flashcards
What are the four types of gas?
Wet gas, dry gas, sour gas, and sweet gas.
What is wet gas?
Propane, butane, pentane, hexane, and heptane. Propane and butane are also known as LP - gases.
What is dry gas?
It’s also known as processed natural gas, and is stored in underground storage tanks for use as a fuel gas.
What is sour gas?
Gas containing a high percentage of hydrogen sulphide.
What is sweet gas?
Natural gas with little or no hydrogen sulphide content.
What is the name of the chemical grouping of petroleum gases?
Hydrocarbons.
Name the three most used petroleum gases.
Natural gas, propane, and butane.
What are the main components of natural gas?
Methane and ethane.
What are the two liquefied petroleum (LP) gases?
Propane and butane.
What is added to fuel gases for safety?
Mercaptan is added as an odorant since natural gas, propane, and butane or non-toxic, tasteless, colorless, and invisible.
What is another term for specific gravity?
Relative density.
What is specific gravity?
The comparison between the weight of the volume of a vapor or liquid gas and the weight of an equal amount of air or water.
Is natural gas heavier or lighter than air?
It is lighter than air with a specific gravity of 0.6.
Is propane and butane heavier or lighter than air?
They are heavier than air. Propane has a sG of 1.52 and butane has a sG of 1.95.
What are the expansion ratios of natural gas, propane, and butane?
Natural Gas: 600:1
Propane: 270:1
Butane 235:1.
These aren’t in the gas code so remember them.
What are the maximum flame speeds of natural gas, propane, and butane?
Natural Gas: 25” Per second.
Propane: 32” Per second.
Butane: 33” Per second.
These aren’t in the gas code so remember them.
What does it mean when a fuel mixture is too “lean”?
Not enough fuel in an air-gas mixture results in the mixture being too “lean.”
What does it mean when a fuel mixture is too “rich”?
Too much fuel in an air-gas mixture results in the mixture being too “rich.”
If 1 cubic foot of liquid natural gas at atmospheric pressure was vaporized, how much space would it occupy?
600 cubic feet.
If 1 cubic foot of propane at atmospheric pressure was vaporized, how much space would it occupy?
270 cubic feet.
If 1 cubic foot of butane at atmospheric pressure was vaporized, how much space would it occupy?
235 cubic feet.
