Fuel Consumption; Fuel Line Sizing - Generac Power Systems rtg16eza1 Owner's Manual

5.3 FUEL CONSUMPTION

NOTE: Required fuel pressure for natural gas is 3.5-7 in water column (7-13 mm mercury). The required fuel pressure for LP Vapor is 10-12
in water column (19-22 mm mercury).
These are approximate values, use the appropriate spec sheet or owner's manual for specifi c values.
Unit
7 / 8 kW
10 / 11 kW
13 / 13 kW
14 / 14 kW
15 / 15 kW
16 / 16 kW
16 / 17 kW
18 / 20 kW
* Natural gas is in cubic feet per hour / cubic meters per hour.
** LP is in gallons per hour / liters per hour.
*** Values given are approximate.
Verify that gas meter is capable of providing enough fuel fl ow to include household appliances and all other loads.
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Gaseous fuels such as natural gas and liquid propane (LP) gas are highly explosive. Even the slightest spark can ignite such fuels

and cause an explosion. No leakage of fuel is permitted. Natural gas, which is lighter than air, tends to collect in high areas. LP gas
is heavier than air and tends to settle in low areas.
NOTE: A minimum of one approved full flow manual shut-off valve must be installed in the gaseous fuel supply line. The valve must be
easily accessible. Local codes determine the proper location.
NOTE: THE GAS SUPPLY AND PIPE MUST BE SIZED AT 100% LOAD BTU / MEGAJOULE RATING.

5.4 FUEL LINE SIZING

• First, determine what size pipe is required. Refer to NFPA 54 for NG or NFPA 58 for LP for further information.
• Always refer to the owner's manual for the proper BTU / megajoule and required gas pressures. To calculate BTU or Megajoules:
– Natural Gas: BTU=Cubic feet / hour x 1000
Megajoules=Cubic meters / hour x 37.26
– Liquid Propane Vapor: BTU=Cubic feet / hour x 2500
• Start by measuring the distance from the generator to the gas source. The generator should be plumbed directly from the source, not off the end
of an existing system.
• When measuring the pipe length, add 2.5 ft (.76 m) for every angle or bend in the pipe and add that to the overall pipe distance.
Nat. Gas
1/2 Load
78 / 2.21
124 / 3.51
157 / 4.45
177 / 5.01
185 / 5.24
193 / 5.47
193 / 5.47
205 / 5.8
Megajoules=Cubic meters / hour x 93.15
Full Load
121 / 3.43
195 / 5.52
255 / 7.22
279 / 7.9
296 / 8.38
312 / 8.83
312 / 8.83
308 / 8.72
LP Vapor
1/2 Load
0.87 / 3.29
1.18 / 4.45
1.64 / 6.2
1.85 / 6.99
1.83 / 6.91
1.9 / 7.2
1.99 / 7.53
2.08 / 7.87
Full Load
1.42 / 5.37
1.92 / 7.28
2.95 / 11.15
3.07 / 11.61
2.86 / 10.82
3.19 / 12.07
3.57 / 13.53
3.85 / 14.57
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