The Gaseous Fuel System - Briggs & Stratton Standby Generator Systems Installation & Start-Up Manual

The Gaseous Fuel System

NOTICE The supplied flexible gaseous pipe is not to be
installed underground or in contact with the ground.
• The entire flexible gaseous pipe must be visible for
periodic inspection and must not be concealed within nor
contact nor run through any wall, floor, or partition.
The information below is provided to assist gaseous fuel
system technicians in planning installations. In no way
should this information be interpreted to conflict with
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.
• 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 might
affect their installation plans before applying these
general guidelines.
The following general rules apply to gaseous fuel
system piping:
• The piping should be of a material that conforms to
federal and local codes, rigidly mounted and protected
against vibration.
• Piping should be protected from physical damage
where it passes through flower beds, shrub beds, and
other cultivated areas where damage could occur.
• Install the flexible, gaseous hose (B) (supplied) between
the generator fuel inlet port (A) and rigid piping to
prevent thermal expansion or contraction from causing
excessive stress on the piping material.
• A union (C) or flanged connection shall be provided
downstream to permit removal of controls.
• A manometer port should be provided (D). A digital
manometer, P/N 19495, is available at your Briggs &
Stratton service center. When the initial test runs are
completed, the manometer is removed and the port
is plugged. The manometer port permits temporary
installation of a manometer to ensure that the engine
receives the correct fuel pressure to operate efficiently
throughout its operating range.
• Where the formation of hydrates or ice is known to
occur, piping should be protected against freezing. The
termination of hard piping should include a sediment
trap (E) where condensate is not likely to freeze.
• A minimum of one accessible, approved manual shutoff
20
valve (F) shall be installed in the fuel supply line within
6 ft (180 cm) of the generator.
• A manual fuel shut-off valve located 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/LPG on all threaded fittings to reduce the
possibility of leakage.
• Installed piping must be properly purged and
leak tested, in accordance with applicable codes
and standards.
F
E
A
A Generator Fuel Inlet
B Flexible Fuel Hose
B
C Union Fitting
C
D Manometer Test Port
D
E Sediment Trap
E
F Manual Shut-off Valve
F
D
C
B
A
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