TP-6727 10/1130 Section 3 Installation Instructions
3.7 Install and Connect Fuel
Supply
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
The fuel system. Explosive fuel vapors can cause severe
injury or death. Vaporized fuels are highly explosive. Use
extreme care when handling and storing fuels. Store fuels in a
well-ventilated area away from spark-producing equipment
and out of the reach of children. Never add fuel to the tank
while the engine is running because spilled fuel may ignite on
contact with hot parts or from sparks. Do not smoke or permit
flames or sparks to occur near sources of spilled fuel or fuel
vapors. Keep the fuel lines and connections tight and in good
condition. Do not replace flexible fuel lines with rigid lines.
Use flexible sections to avoid fuel line breakage caused by
vibration. Do not operate the generator set in the presence of
fuel leaks, fuel accumulation, or sparks. Repair fuel systems
before resuming generator set operation.
Note: Have the fuel piping and regulator installed by the
fuel supplier. The fuel supply installation must
comply with NFPA and local codes.
1. See Figure 3-3, Figure 3-4, and Figure 3-5 for the
fuel supply requirements. Add up the fuel
requirements for the generator set plus all other
gas-fired equipment fueled by the same supply.
Check that the primary regulator and gas meter
have sufficient capacity for the fuel requirements
for the generator set plus all other gas-fired
equipment. Have the fuel supplier install a larger
gas meter, if necessary.
2. 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. Use
the pipe size indicated in Figure 3-6 for the total
length of pipe.
Have your fuel supplier install a manual fuel
shut-off valve and rigid gas piping. Bring the pipe to
within 10 inches of the generator set fuel inlet
location. See Figure 3-7.
Model
Gas Flow Rate, Btu/hr.
Natural Gas LP
15 kW 205,000 212,500
30 kW 548,000 547,500
Figure 3-3 Natural Gas Flow Rate
Fuel Supply Specifications
Fuel type LP Gas or Natural Gas
Fuel supply inlet 3/4-14 NPT
Fuel supply pressure oz./in.
2
(in. H
2
O)
4-6 (7-11)
Nominal Fuel Rating, Btu/ft
3
:
Natural gas 1000
LP vapor 2500
Figure 3-4 Fuel Requirements
Fuel Consumption 15 kW 30 kW
Natural Gas, m
3
/hr.(cfh)at%load
100% 5.7 (200) 12.7 (450)
75% 4.5 (160) 10.6 (375)
50% 3.5 (125) 8.5 (300)
25% 2.5 (90) 6.4 (225)
LP Gas, m
3
/hr.(cfh)at%load
100% 2.4 (85) 5.1 (180)
75% 1.8 (65) 4.2 (150)
50% 1.4 (51) 3.4 (120)
25% 1.0 (37) 2.5 (90)
Figure 3-5 Generator Set Fuel Consumption
Maximum Pipe
Length m (ft.)
Pipe Size
15 kW 30 kW
6.1 m (20 ft.) 3/4 in. NPT 1 1/4 in. NPT
9.1 m (30 ft.) 1in.NPT 1 1/4 in. NPT
18.3 m (60 ft.) 1in.NPT 1 1/2 in. NPT
30.5 m (100 ft.) 1 1/4 in. NPT 1 1/2 in. NPT
45.7 m (150 ft.) 1 1/4 in. NPT 2in.NPT
61.0 m (200 ft.) 1 1/4 in. NPT 2in.NPT
Figure 3-6 Fuel Pipe Sizes
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