Planning The Gaseous Fuel Installation; Fuel Pipe Sizing - Briggs & Stratton FORTRESS Manual Del Usuario

Planning the Gaseous Fuel
Installation
The information provided below is intended to assist
gaseous fuel system technicians in planning installations.
State and local codes may override some of these
recommendations. Consult with the local fuel supplier or fire
marshall if clarification is needed.
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.
The owner and installer should consult one another to review
any changes to the installation plan that might arise when
applying the following guidelines for gaseous fuel plumbing.
• 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
where it passes through flower beds, shrub beds, and
other cultivated areas where damage could occur.
• Install the supplied flexible gaseous hose (B, at right)
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.
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.
• A union (C) or flanged connection shall be provided
downstream to permit removal of controls.
• A manometer test port (D) should be installed. The
port permits temporary installation of a manometer
to check whether the engine is receiving the correct
fuel pressure to operate efficiently throughout its
operating range. A digital manometer (P/N 19495) is
available at your service center. When the initial test
runs are completed, the manometer is removed and the
port is plugged.
• 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.
14
• 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.
• 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 - Generator Fuel Inlet
B - Flexible Fuel Hose
C - Union Fitting
D - Manometer Test Port
E - Sediment Trap
F - Manual Shut-off Valve

Fuel Pipe Sizing

There are numerous on-line or printed references for fuel
pipe sizing. For example, NFPA 54 - National Fuel Gas
Code, 2006 (Item #320-6031-06) is a common resource.
The installer should consider the specific gravity of gas,
compensate for a nominal amount of restriction from
bends and fittings, and refer to federal and local codes for
guidance.
D
C
B
A
BRIGGSandSTRATTON.COM