1.6 Fuel Requirements
The generator set operates using natural gas or LP vapor fuel. The generator set is
The fuel system installation must comply with the NEC and local codes.
1.6.1Fuel Supply
Because of variable climates and geographical considerations, contact the local fuel supplier for fuel system planning and installation. Figure
Fuel types | Natural Gas | LP Vapor |
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Fuel supply inlet | 1/2 NPT | |
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Fuel supply pressure, |
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kPa (in. H2O), 12 kW | ||
Fuel supply pressure, |
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kPa (in. H2O), 17/18 kW | ||
Fuel flow rate, Btu/hr., |
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12 kW | 193000 | 203000 |
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Fuel flow rate, Btu/hr., |
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17/18 kW | 242000 | 280000 |
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Nominal Fuel Rating, Btu/ft3 |
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Natural gas | 1000 | |
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LP vapor | 2500 | |
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Figure 1-10 Fuel Supply
Verify that the output pressure from the primary gas utility (or LP tank) pressure regulator is within the range shown in Figure 1-10 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.
See Figure 1-2 or Figure 1-4 for 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 % Rated Load
Natural Gas, m3/hr. (cfh)
100% | 5.9 | (209) |
75% | 4.8 | (168) |
50% | 3.6 | (127) |
25% | 2.4 | (85) |
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LP Vapor, m3/hr. (cfh) |
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100% | 3.1 | (108) |
75% | 2.5 | (87) |
50% | 1.9 | (65) |
25% | 1.2 | (44) |
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LP vapor conversion factors:
8.58ft.3 = 1 lb. 0.535 m3 = 1 kg
36.39ft.3 = 1 gal.
Nominal fuel rating: | 37 MJ/m3 (1000 Btu/ft.3) |
Natural gas: | |
LP vapor: | 93 MJ/m3 (2500 Btu/ft.3) |
Figure 1-11 Fuel Consumption, 12 kW Models
Fuel Consumption at % Rated Load
Natural Gas, m3/hr. (cfh)
100% | 6.9 | (242) |
75% | 5.8 | (204) |
50% | 4.4 | (155) |
25% | 3.4 | (120) |
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LP Vapor, m3/hr. (cfh) |
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100% | 3.2 | (112) |
75% | 2.7 | (96) |
50% | 2.1 | (74) |
25% | 1.6 | (57) |
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LP vapor conversion factors:
8.58ft.3 = 1 lb. 0.535 m3 = 1 kg
36.39ft.3 = 1 gal.
Nominal fuel rating: | 37 MJ/m3 (1000 Btu/ft.3) |
Natural gas: | |
LP vapor: | 93 MJ/m3 (2500 Btu/ft.3) |
Figure 1-12 Fuel Consumption, 17/18 kW Models
Section 1 Installation 19 |