Gaseous Fuel Systems
Installation Guidelines For Spark-Ignited Stationary Generators 17
Gaseous Fuel Systems
NG System
The utility gas provider will provide the gas meter. Con-
tact utility gas provider to verify they offer a gas meter
that will deliver a sufficient fuel supply. Local utility is also
responsible for providing fuel at sufficient volume and
pressure to operate the primary regulator. Primary regu
-
lator can then provide the correct volume of fuel at the
required pressure to generator.
The piping system between the primary pressure regula-
tor and generator must be correctly sized to provide fuel
volume required at 100% load, while also staying within
pressure range noted on unit specification sheet.
Follow regulator manufacturer's recommendation for
placement and mounting of regulator.
Flexible Fuel Line
Flexible fuel line isolates vibration from generator to
reduce possibility of a fuel leak at one of the connection
points.
From the primary regulator, fuel flows to generator con-
nection point, which is the end of the manufacturer sup-
plied flexible fuel line. Flexible fuel line must not be
connected directly to generator connection point. Always
connect flexible fuel line to an approved gas fitting (per
-
pendicular to frame rail, or by an elbow and short nipple
to fuel inlet itself (to run parallel to frame rail). The nipple
and elbow used must be the same pipe size as flexible
fuel line and generator connection point.
When connecting flexible fuel line to generator, use a
listed nonmetallic assembly meeting the requirements of
ANSI Z21.75/ CSA 6.27—Connectors for Outdoor Gas
Appliances and Manufactured Homes or AGA-approved
flexible fuel line in accordance with local regulations.
NOTE: Follow all installation instructions and warnings
provided with flexible fuel line. Do not remove any labels
or tags. Installation must always comply with applicable
codes, standards, laws, and regulations.
Additional flexible fuel line options can be ordered. Con-
tact an IASD for more information on sizes and availabil-
ity.
Primary Regulator Outlet
Primary regulator outlet and generator connection point
must be sized correctly to provide generator with
required volume and pressure when it is operating at
100% of its rated load.
The unit-mounted regulator (it may be either a demand
regulator or a pressure regulator) and its associated
shutoff valves control flow and pressure to unit for correct
operation. The fuel pressure required for generator to
operate is always measured at the primary fuel valve.
See
Fuel Shutoff Valve for location of the pressure test
connection. Supply pressure and volume must meet
requirements described in unit specification sheet. If
specifications are not met, generator will not operate cor
-
rectly and may display symptoms such as hard starting,
rough running, inability to carry load, and erratic opera
-
tion.
Fuel pressure from primary regulator (supplied by install-
ing contractor) to generator's fuel shutoff valve should be
between 3.5–14 in water column (0.87–3.48 kPa).
Always verify fuel pressure using the appropriate specifi
-
cation sheet for the generator.
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