Briggs & Stratton FORTRESS Series Installation And Operation Manual page 17

applicable fuel gas codes. Consult with your local fuel
supplier or Fire Marshall if questions or problems arise.
WARNING
Propane and Natural Gas are extremely flammable
and explosive, which could cause burns, fire or explosion
resulting in death or serious injury.
• The generator is equipped with an automatic safety
gas fuel shut-off valve.
• DO NOT operate the equipment if the fuel shut-off valve
is missing or inoperative.
WARNING
Propane and Natural Gas are extremely flammable
and explosive, which could cause burns, fire or explosion
resulting in death or serious injury.
• LP gas is heavier than air and will settle in low areas.
• Natural gas is lighter than air and will collect in high
areas.
• The slightest spark could ignite these fuels and cause
an explosion.
• DO NOT light a cigarette or smoke.
TO THE INSTALLER: Consult with the generator owner(s)
and convey any technical considerations that can affect their
installation plans before applying these general guidelines.
The following general rules apply to gaseous fuel system
piping:
• The piping material must conform to federal and local
codes, be rigidly mounted, and be protected against
vibration.
• Piping should be protected from physical damage,
especially where it passes through flower beds, shrub
beds, and other cultivated areas where damage can
occur.
• Install the provided flexible fuel line (B) between the
generator fuel inlet port (A) and the rigid piping to
prevent thermal expansion and contraction from causing
excessive stress on the piping material.
• A union (C) or a flanged connection must be provided
downstream to permit removal.
• A manometer test port (D) should be installed for
vapor fuels. Use the port to install a manometer and
check if the engine receives the correct fuel pressure
for operation. A digital manometer (P/N 19495) or an
analog manometer is available at your service center for
vapor fuels only. When the initial test runs are completed,
the manometer is removed and the port is plugged.
• For vapor fuels only: Where the formation of hydrates or
ice is known to occur, piping should be protected against
freezing. The termination of hard piping must include
a sediment trap (E) where condensate is not likely to
freeze.
• A minimum of one accessible, approved manual shutoff
valve (F) shall be installed in the fuel supply line within 6
ft (180 cm) of the generator.
• You must install a manual fuel shut-off valve in the interior
of the building.
• Where local conditions include earthquake, tornado,
unstable ground, or flood hazards, special consideration
shall be given to increase strength and flexibility of piping
supports and connections.
• Piping must be of the correct size to maintain the
required supply pressures and volume flow under
varying generator load conditions with all gas appliances
connected to the fuel system turned on and operating.
• Use a pipe sealant or joint compound approved for
use with NG/LP on all threaded fittings to reduce the
possibility of leakage.
NOTICE Keep thread sealant out of the gas piping to
prevent component part damage.
• Installed piping must be properly purged and leak tested,
in accordance with applicable codes and standards.
(A) Generator Fuel Inlet
(B) Flexible Fuel Line
(C) Union Fitting
(D) Manometer Test Port
(E) Sediment Trap
(F) Manual Shut-off Valve
Fuel Type
An important consideration affecting the entire installation
is the type of fuel used by your generator. The system was
factory tested and adjusted using natural gas, but can be
converted to use LP vapor. For correct engine function,
factors that are inherent to each of these fuels, like your
location and the duration of possible utility interruptions, are
important considerations in the following fuel guidelines:
• Use clean, dry fuel that is free of moisture or
any particulate material. Using fuels outside the
17