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DISTRIBUTION OF NATURAL GAS
Utility companies send natural gas through underground pipes, called “mains.” The gas in these
mains is pressurized at between 25 and 60 pounds-per-square-inch (psi).
Branches carry the pressurized gas to the various buildings, and are connected to gas meters.
The meters decrease the main’s gas pressure to 7 inches water column pressure (1/4 pounds) for
use by the appliances inside the buildings (see Figure 1-6).
Gas Meter
(Service Regulator)
Gas Main 25 - 60 Pounds
In-House Gas Supply Line
Water
Heater
Range
Furnace
Dryer
Appliance
Regulator
4
"
7
"
WCP (1/4 Pound)
25 To 60 Pounds Pressure “Main”
7
"
WCP (1/4 Pound Pressure)
DISTRIBUTION
REGULATOR
SERVICE
REGULATOR
SERVICE
REGULATOR
A gas piping system is able to supply gas to all of the appliances in a building at one time. Ranges
generally operate on gas pressure rated at 4 inches water column pressure. Each appliance
usually has its own pressure regulator to more accurately meet the designed requirements (see
Figure 1-7).
Figure 1-6
Figure 1-7