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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.

1.6.1

Fuel Supply

Because of variable climates and geographical

considerations, contact the local fuel supplier for fuel

system planning and installation. Figure 1-6 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

Fuel flow rate, Btu/hr.

Nominal Fuel Rating,

Btu/ft.

Figure 1-6 Fuel Supply

Verify that the output pressure from the primary gas

utility (or LPG tank) pressure regulator meets the

specifications 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. See

Figure 1-7 for fuel consumption.

supplier for flow rate information or a gas meter

upgrade.

The dimension drawings in Section 2 show the location

of the fuel inlet connection. Use flexible sections to

prevent fuel line breakage caused by vibration. Hold the

fuel pipe coupling with a wrench when tightening the fuel

connections. Protect all fuel lines from machinery or

equipment contact, adverse weather conditions, and

environmental damage.

Section 1 Installation

Natural Gas

LPG

1/2 NPT

0.9- 2.7

1.7- 2.7

(3.5- 11)

(7- 11)

193000

203000

1000

2500

Contact the fuel

Fuel Consumption,

at % load, m

/hr. (cfh)

Natural Gas, m

/hr. (cfh)

100%

75%

50%

25%

LPG, m

/hr. (cfh)

100%

75%

50%

25%

LPG conversion factors:

8.58 ft.

= 1 lb.

0.535 m

= 1 kg

36.39 ft.

= 1 gal.

Nominal fuel rating:

Natural gas:

37 MJ/m

LPG:

93 MJ/m

Figure 1-7 Fuel Consumption

1.6.2

Fuel Pipe Size

Ensure that the natural gas pipe size and length meet

the specifications in Figure 1-8.

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 1-8 to find the required pipe size.

Contact the local LPG provider for LPG installation

information.

Minimum Gas Pipe Size Recommendation, in. NPT

Pipe Length,

Natural Gas

m (ft.)

(193,000 Btu/hr.)

8 m

(25 ft.)

15 m

(50 ft.)

30 m

(100 ft.)

46 m

(150 ft.)

61 m

(200 ft.)

Figure 1-8 Fuel Pipe Size

60 Hz

50 Hz

5.4 (193)

4.8 (173)

4.7 (163)

4.2 (148)

3.5 (124)

3.1 (108)

2.6 (93)

2.4 (84)

2.3 (81)

2.1 (74)

2.1 (75)

1.9 (68)

1.8 (60)

1.5 (53)

1.2 (45)

1.1 (40)

(1000 Btu/ft.

)

(2500 Btu/ft.

)

Measure the pipe

LPG

(203,000 Btu/hr.)

3/4

1 1/4

TP-6967 2/21