American Gas Association.
The ratio of the air supply to the gas supply,
necessary to achieve proper combustion.
British Thermal Unit A unit of
heat measurement which is defined as the amount of
heat required to raise one pound of water one degree
Fahrenheit. Processed natural gas typically contains
1,000 BTU/cubic foot.
The pressure used as a standard in determining
gas volumes. The pressure condition used to define a
cubic foot of natural gas if four ounces per square
Protection A method of preventing
the corrosion or deterioration of underground pipe
and connected equipment, through the control of
Abbreviation for 100 cubic feet of natural
The point or measuring station at which a gas
distribution utility receives natural gas from
pipeline transmission company.
Basic unit of measurement by which natural gas
is generally sold.
System The mains, service piping
and equipment operated by a distribution company to
deliver natural gas to customers.
A naturally occurring mixture of hydrocarbon
and non-hydrocarbon gases found in porous geological
formations beneath the earths surface. The
principal component is methane.
Volume of gas lost through holes in pipes or
fittings, bad joints, or broken pipes or fittings.
Local Distribution Company A
natural gas utility company that delivers natural gas
directly to the consumer.
The rate of natural gas from one point to
another. As contrasted with service piping, mains
generally carry larger volumes for general or
Abbreviation for maximum allowable operating
pressure. Refers to the maximum gas pressure at which
a piping system is allowed to operate.
Abbreviation for 1,000 cubic feet of natural gas.
Devices used to measure and record the usage
of natural gas. Typical types are orifice, positive
displacement, rotary and turbine.
Abbreviation for one million cubic feet of
The placing of malodorant, usually mercaptan,
in natural gas for the purpose of detecting its
presence. Especially helpful for reporting and
investigating possible leakage.
Piping designed to deliver larger volumes of
natural gas over great distances; are usually
operated by gas transmission companies and often are
larger diameter pipes operating at high pressure.
Most city gates receive natural gas from a pipeline.
Regulator Device used to reduce and
maintain a constant pressure to a piping system.
Regulating System Consists of
equipment installed for the purpose of reducing and
regulating pressure to natural gas mains.
Over-pressure protection device designed to
exhaust excess natural gas pressure to atmosphere and
prevent piping from operating above the MAOP.
Piping delivering natural gas from the
distribution main to the customers premises.
a quantity of heat equal to 100,000 BTU.
Approximately the same heat content as 100 cubic feet
of natural gas