Generac Power Systems GP Series Owner's Manual page 16

erator is installed. See the NFPA website at
www.nfpa.org for further information regard-
ing NFPA requirements.
Always contact local fuel suppliers or fire mar-
shal to verify codes and regulations for correct
installation. Local codes will mandate correct
routing of gaseous fuel line piping around gar-
dens, shrubs, and other landscaping.
Natural Gas Pipe Sizing
To determine correct NG pipe size, find the kW rating of generator in the left column, and trace to
the right. The number to the right is maximum length (measured in ft / m) allowed for the pipe sizes
on top. Pipe sizes are measured by trade size diameter to include any fittings, valves (must be full
flow), elbows, tees, or angles.
NOTE: See Table B.3.2 in NFPA 54 or Table A.2.2 in the ICC IFGC, Equivalent Lengths of Pipe
Fittings and Valves for the correct values to be added to overall fuel piping length. Tables are
based on schedule 40 black pipe. If installing any other piping system, follow pipe sizing charts for
selected piping system.
Pipe Size
(in / mm)
0.5/13
9.5 kW 10/3.1
Installing and Connecting Fuel
Lines
Explosion and fire. Fuel and vapors are extremely
flammable and explosive. No leakage of fuel is
permitted. Keep fire and spark away. Failure to do
so will result in death or serious injury.
IMPORTANT NOTE: NG and LP gas are
highly volatile substances. Strictly adhere
to all safety procedures, codes, standards,
and regulations.
Fuel line connections should be made by a
certified contractor familiar with local codes.
Always use AGA-approved gas pipe and a
quality pipe sealant or joint compound.
Verify capacity of NG meter or LP tank to pro-
vide sufficient fuel for both the generator and
other operating appliances.
Fuel Shutoff Valve
See Figure 2-17. The generator will require an
external manual fuel shutoff valve (A) on the
fuel line.
Owner's Manual for Portable Generator
Table 2-1. NG Pipe Sizing
For 5–7 in Water Column
(1.24–1.74 kPa)
0.75/19 1/25
60/18.3 200/61
DANGER
Piping strength and connections should be
given special consideration for installations in
areas at risk for flooding, tornadoes, hurri-
canes, earthquakes, and unstable ground.
IMPORTANT NOTE: Use an approved pipe
sealant or joint compound on all threaded
NPT fittings.
NOTE: All installed gaseous fuel piping must
be purged and leak tested prior to initial
startup in accordance with local codes, stan-
dards, and regulations.
Allowable Pipe Distances (ft/m)
1.25/32 1.5/38
750/228.6 —
NOTE: Fuel shutoff valve must be installed at
a readily accessible location, and within six (6)
ft (1.8 m) of generator fuel inlet.
(000192)
Figure 2-17. QUICK DISCONNECT, Fuel
Shutoff Valve with Manometer Port, and
Figure 2-18
a manometer port for making fuel pressure
checks. This optional accessory fuel shutoff
valve permits making pressure checks for
diagnostic purposes without going into the
generator enclosure.
For 3.5–5 in Water Column
(0.87–1.24 kPa)
0.75/19 1/25 1.25/32
20/6.1 60/18.3 175/53.3
A
Flexible Fuel Line
illustrates a fuel shutoff valve with
1.5/38
—
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