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FUEL TYPES
Gas Fuels are categorized as follows:
#1 = Natural Gas
#2 = Mixed Gas
#3 = Manufactured Gas
#4 = Liquefied Petroleum Gas
#1 — NATURAL GAS
Natural Gas
is found underground. It is referred to as “wet gas,” because it contains heavy
hydrocarbons, such as propane and butane. These hydrocarbons are removed by the gas
company so that only the pure natural gas properties, methane and ethane, are left.
Natural gas is lighter than air, and has a heat value of between 900 and 1200 B.T.U. per-cubic-foot.
#2 — MIXED GAS
Mixed Gas
consists of natural and manufactured gas. It is lighter than air, and has a heat value
of between 700 and 900 B.T.U. per-cubic-foot.
#3 — MANUFACTURED GAS
Manufactured Gas
is made from coal and petroleum. It is lighter than air, and has a heat value
of between 500 and 700 B.T.U. per-cubic-foot.
#4 — LIQUEFIED PETROLEUM (L.P.) GAS
Liquefied Petroleum (L.P.) Gas
consists of the heavy hydrocarbons “propane or butane.” Both
of these gases are converted from a
gaseous
to a
liquid
state by using pressure. The liquid gas
can then be stored in a pressurized tank and easily transported. The liquid gas will return to its
gaseous state when it is released into the atmosphere. L.P. gas is heavier than air and will lay in
the lowest spot it can find when released into a room.
Propane
has a heat value of 2500 B.T.U. per-cubic-foot, and
butane
a value of 3200 B.T.U. per-
cubic-foot.