XP-6514 4/09 15Section 1 Installation
1.6 Fuel Requirements
The generator set operates using natural gas or LP
vapor fuel. The generator set is EPA-certified for both
natural gas and LP vapor fuels.
The fuel system installation must comply with the NEC
and local codes.
1.6.1 Fuel Supply
Because of variable climates and geographical
considerations, contact the local fuel supplier for fuel
system planning and installation. Figure 1-10 lists the
recommended fuel ratings and other fuel supply
information for natural gas and LP vapor fuels.
Fuel type
Natural
Gas
LP
Vapor
Fuel supply inlet 1/2 NPT
Fuel supply pressure, kPa (in. H
2
O)
RGEN12
1.3--2.7
(5--11)
1.7--2.7
(7--11)
Fuel supply pressure, kPa (in. H
2
O),
RGEN17/18
1.7--2.7
(7--11)
Fuel flow rate, Btu/hr.
RGEN12 193000 203000
RGEN17/18 242000 280000
Nominal Fuel Rating, Btu/ft.
3
Natural gas 1000
LP vapor 2500
Figure 1-10 Fuel Supply
Verify that the output pressure from the primary gas
utility (or LP tank) pressure regulator is 1.7--2.7 kPa
(7--11 in. water column) and that the utility gas meter
flow rate is sufficient to supply the generator set at rated
load plus all other gas-consuming appliances. See
Figure 1-11 or Figure 1-12 for fuel consumption.
Contact the fuel supplier for flow rate information or a
gas meter upgrade.
Figure 1-2 or Figure 1-4 shows the location of the fuel
inlet connection. Use flexible sections to prevent fuel
line breakage caused by vibration. Hold the fuel
solenoid valve with a wrench when tightening the fuel
connections. Protect all fuel lines from machinery or
equipment contact, adverse weather conditions, and
environmental damage.
Fuel Consumption, at % load m
3
/hr. (cfh) 60 Hz
Natural Gas, m
3
/hr. (cfh)
100% 5.9 (209)
75% 4.8 (168)
50% 3.6 (127)
25% 2.4 (85)
LP Vapor, m
3
/hr. (cfh)
100% 3.1 (108)
75% 2.5 (87)
50% 1.9 (65)
25% 1.2 (44)
LP vapor conversion factors:
8.58 ft.
3
=1lb.
0.535 m
3
=1kg
36.39 ft.
3
= 1 gal.
Nominal fuel rating:
Natural gas: 37 MJ/m
3
(1000 Btu/ft.
3
)
LP vapor: 93 MJ/m
3
(2500 Btu/ft.
3
)
Figure 1-11 Fuel Consumption, RGEN12
Fuel Consumption, at % load m
3
/hr. (cfh) 60 Hz
Natural Gas, m
3
/hr. (cfh)
100% 6.9 (242)
75% 5.8 (204)
50% 4.4 (155)
25% 3.4 (120)
LP Vapor, m
3
/hr. (cfh)
100% 3.2 (112)
75% 2.7 (96)
50% 2.1 (74)
25% 1.6 (57)
LP vapor conversion factors:
8.58 ft.
3
=1lb.
0.535 m
3
=1kg
36.39 ft.
3
= 1 gal.
Nominal fuel rating:
Natural gas: 37 MJ/m
3
(1000 Btu/ft.
3
)
LP vapor: 93 MJ/m
3
(2500 Btu/ft.
3
)
Figure 1-12 Fuel Consumption, RGEN17/18
1.6.2 Fuel Pipe Size
Ensure that the natural gas pipe size and length meet
the specifications in Figure 1-13 or Figure 1-14.
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