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1.7.1
Fuel Supply
Because of variable climates and geographical
considerations, contact the local fuel supplier for fuel
system planning and installation. Figure 1-6 lists the
recommended fuel ratings and other fuel supply
information for natural gas and LPG fuels.
Fuel type
Fuel supply inlet
Fuel supply pressure,
kPa (in. H
O)
2
Fuel flow rate, maximum, Btu/hr.:
8RESV/RESVL
10RESV/RESVL
12RESV/RESVL
Nominal Fuel Rating, Btu/ft.
Natural gas
LPG
Figure 1-6 Fuel Supply
Pipe Length,
Natural Gas
m (ft.)
(99,200 Btu/hr.)
8
(25)
1/2
15
(50)
3/4
30
(100)
46
(150)
61
(200)
Figure 1-7 Fuel Pipe Size Recommendations
TP-6984
5/17a
Natural
Gas
LPG
1/2 NPT
0.87--2.7
1.7--2.7
(3.5-11)
(7-11)
99,200
160,800
179,000
222,500
216,000
257,500
3
1000
2500
Minimum Gas Pipe Size Recommendation, in. NPT
8RESV/RESVL
LPG
(160,800 Btu/hr.)
3/4
3/4
1
3/4
1
1
1
1 1/4
Verify that the output pressure from the primary gas
utility pressure regulator is as shown in Figure 1-6 and
that the utility gas meter flow rate is sufficient to supply
the generator set at rated load plus all other
gas-consuming appliances. For LPG tanks, verify that
the output pressure is as shown in Figure 1-6. See
Figure 1-9 for fuel consumption. Contact the fuel
supplier for flow rate information or a gas meter
upgrade, if necessary.
1.7.2
Fuel Pipe Size
Ensure that the fuel pipe size and length meet the
specifications in Figure 1-7. Measure the pipe length
from the primary gas pressure regulator to the pipe
connection on the generator set fuel inlet. Add 2.4 m
(8 ft.) to the measured length for each 90 degree elbow.
Compare the total pipe length with the chart in
Figure 1-7 to find the required pipe size.
Contact local LPG provider for LPG installation
information.
10RESV/RESVL
Natural Gas
LPG
(179,000 Btu/hr.)
(222,500 Btu/hr.)
3/4
3/4
1
3/4
1
1
1 1/4
1
1 1/4
1 1/4
12RESV/RESVL
Natural Gas
LPG
(216,000 Btu/hr.)
(257,500 Btu/hr.)
3/4
3/4
1
1
1 1/4
1
1 1/4
1 1/4
1 1/4
1 1/4
Section 1 Installation
15