Section 5: Fuel Conversion/Gas Connections
18 Installation Guidelines For 60 Hz Air-cooled Generators
Fuel Consumption
Fuel Line Sizing
Selecting the correct size fuel line is crucial to the proper
operation of the unit. The generator inlet size has no
bearing on the size gas pipe to be used.
For further information refer to NFPA 54 for NG or NFPA
58 for LP.
Measure the distance from the generator to the gas
source.
IMPORTANT NOTE: The generator should be plumbed
directly from the source, not off the end of an existing
system.
NOTE: When measuring the pipe length, add 2.5 ft (0.76
m) for every angle or bend in the pipe to the overall
required length of pipe needed.
Generator Natural Gas Propane
1/2 Load Full Load 1/2 Load Full Load
8 kW 2.21 / 78 3.43 / 121 0.87 / 3.29 / 32 1.42 / 5.37 / 52
11 kW 3.48 / 123 5.64 / 166 1.19 / 4.49 / 43 2.01 / 7.62 / 73
16 kW 5.47 / 193 8.83 / 312 1.9 / 7.2 / 69 3.19 / 12.07 / 116
20 kW 5.8 / 205 8.72 / 308 2.08 / 7.87 / 76 3.85 / 14.57 / 140
22 kW 5.21 / 184 7.96 / 281 2.16 / 8.16 / 78 3.68 / 13.94 / 134
* Natural gas is in m
3
/h / ft
3
/h
** Propane is in gal/h / l/h (LP) / ft
3
/h (LPV)
*** Values given are approximate
These are approximate values. Use the appropriate spec sheet or owner’s manual for specific values.
Verify that gas meter is capable of providing enough fuel flow to include household appliances and all other loads.
NOTE: The gas supply and pipe MUST be sized at 100% load BTU / Megajoule rating.
Always refer to the Owner’s Manual for the proper BTU, Megajoule and required gas pressures:
– Natural Gas:
BTU = ft
3
/h x 1000
Megajoules = m
3
/h x 37.26
– Liquid Propane Vapor:
BTU = ft
3
/h x 2500
Megajoules = m
3
/h / hour x 93.15
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