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Propane (LPG) and natural gas (NG) is
extremely flammable and explosive.
Fire or explosion can cause serious
burns or death.
LPG is heavier than air and will settle in low areas.
NG is lighter than air and will collect in high areas.
The slightest spark can ignite either fuel and can
cause fire or explosion.
This home standby generator set leaves the factory
set up for natural gas (NG) fuel. This generator can
be ordered with liquid petroleum gas (LP) from the
factory or it can easily be converted at the jobsite
with no special tools or test equipment.
All piping and layout planning must comply with
NFPA 54 (specifications for dry fuel equipment). Be-
fore fuel pipe installation begins, installer should con-
sult local fuel supplier and the local Fire Marshall to
learn proper codes/regulations for a safe installation.
Special consideration should be given where local
conditions include flooding, tornados, hurricanes,
earthquakes, or unstable ground for the flexibility
and strength of fuel pipe and pipe connections. Use
an approved gas pipe sealant on all threaded pipe
joints.
All installed gas fuel lines must be purged and leak
tested prior to initial start-up in accordance to local
codes, standards, and regulations.
A minimum of (1) approved manual shut-off gas valve
must be installed in the gas line leading to the gen-
erator. This valve must be easily accessible.
A furnished, flexible fuel line is to be in-
stalled between stationary fuel supply pipe
and fuel inlet pipe to generator. Always
install this flexible line in a horizontal, straight man-
ner. If it is installed with a bend of any degree, it may
eventually crack at the bend and cause a gas leak,
causing a possible fire hazard.
NATURAL GAS FUEL
Required natural gas fuel pressure must be 6 to 8
inches water column (4 to 4½ ounces) and minimum
1000 BTU rating per cubic foot/hour
Figure 1
* BTU Values based on 1000 BTU’s per cubic foot.
Gas supplier may need to know Nat. Gas consumption
at full load, in measurements of cubic feet/hour or
BTU/hour
Figure 2
CAUTION:
It is critically important to understand that
as a specific fuel line pipe diameter is extended in
length, its ability to carry the volume of gas, dimin-
ishes in direct proportion.
EXAMPLE 1:
A model SPH-120, 12 KW generator is
to be installed 25 feet from gas meter. In reading the
charts: figure 1 chart shows this model to require 235
cubic feet per hour (or 235,000 BTU/HR) gas volume
to be delivered to generator. Figure 2 chart shows
the required 235 cubic feet/hour can only be deliv-
ered up to 20 feet, with ¾” diameter pipe, or up to 50
feet with a 1” diameter pipe, or up to 90 feet with a
1¼” diameter pipe.
This means the original
planned distance of 25 feet, must be shortened to
20 feet with ¾” diameter pipe, or use 1” diameter
pipe at the 25 feet distance.
NATURAL GAS CONSUMPTION AT FULL LOAD
Gen. Model
Gen. KW
Cubic Ft./Hr
BTU/Hr. *
SPS-100
10.0
185
185,000
SPS-120
12.0
195
195,000
SPH-120
12.0
235
235,000
SPV-160
16.0
280
280,000
NATURAL GAS FUEL LINE MAXIMUM
DIAMETERS AND LENGTHS
Pipe
Length In
Feet
Allowed Distance From NG Meter to Gen-Set
0-10
11-
20
21-
30
31-
40
41-
50
51-
60
61-
70
71-
80
81-
90
Pipe Diamet
er
In Inches
¾
350
249
200
171
152
138
---
---
---
1
600
415
342
288
251
224
204
187
---
1¼
1265
890
740
628
553
497
455
421
350
Cubic feet of natural gas that can safely be
carried in its matching pipe diameter.
The following LPG and NG fuel information is pro-
vided to assist the fuel installer. In no way should
this information be deemed to be all-inclusive or to
conflict with local dry fuel codes. Consult your local
fuel supplier or Fire Marshall for final answers on
proper local codes and installations.
THE GASEOUS DRY FUEL SYSTEM INSTALLATION
WARNING
WARNING
