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Fuel Pipe Sizing
There are numerous on-line or otherwise-published
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.
Fuel Conversion
The unit is shipped from the factory calibrated for NG
operation. To convert the engine from NG to LP vapor, follow
these steps:
1. Set generator circuit breaker to OFF.
2. Set control panel system switch to OFF.
3. Remove 15 Amp fuse from system control panel.
4. Locate the fuel selector switch (A) . Using a 6 mm
Allen wrench, turn the selector switch to either
LP or NG.
5. Reinstall 15 Amp fuse in system control panel.
6. Set exercise timer.
Fuel Pressure
Both LP vapor and natural gas fuel supply pressure at the
generator's fuel inlet port should be between 7 to 11 inches
(18 to 28 cm) of water (in. W.C.) at full load with all gas
appliances turned on and operating. Maximum pressure with
engine OFF at No Load is 13.85 in. W.C.
18
Power Loss
Air density is less at high altitudes, resulting in less available
engine power. Specifically, engine power will decrease 3%
for each 1,000 feet (300 m) above sea level and 1% for each
10° F (5.6°C) above 77°F (25°C). Generators located in these
conditions, that use power management technology must
have their transfer switch programmed appropriately for this
power decrease.
Fuel Consumption
Estimated fuel supply requirements at half and full load for
natural gas and LP vapor fuels are shown here.
35kW LP Vapor Fuel Consumption
Full Load
BTU/hr
465100
CF/ph
m³/ph
GAL/hr
32kW Natural Gas Fuel Consumption
Full Load
BTU/hr
458800
CF/ph
m³/ph
Physical Properties
A
Normal Atmospheric State
Boiling Point (in °F):
Initial
End
Heating Value:
BTU per gallon (Net LHV*)
BTU per gallon (gross**)
Cubic feet (gas)
Density***
Weight†
Octane Number:
Research
Motor
*
LHV (Low Heat Value) is the more realistic rating.
**
Gross heat value does not consider heat lost in the form of water
during combustion.
*** Density is given in "Cubic Feet of Gas per Gallon of Liquid".
†
Weight is given in "Pounds per Gallon of Liquid".
1/2 Load
292900
186
117
5.3
3.3
4.9
3.1
1/2 Load
282000
458
282
13.0
8.0
LP Vapor
Natural
Gas
-44
-44
83,340
91,547
2,500
36.39
4.24
110+
97
BRIGGSandSTRATTON.COM
Exercise
132500
53
1.5
1.4
Exercise
109000
109
3.1
Gas
Gas
-259
-259
63,310
1,000
57.75
2.65
110+
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