Fuel Conversion/Gas Connections
Installation Guidelines for Air-Cooled Generators 21
4. When measuring pipe length, add 2.5 feet (0.76m) for each angle or bend in the pipe run and add that to the
overall pipe distance.
5.4.1— Natural Gas Pipe Sizing
The following table indicates the maximum length (measured in feet / meters) allowed for various pipe sizes. The pipe
sizes are measured by inside diameter (ID) to include any fittings, valves (must be full flow), elbows, tees or angles.
Add 2.5 feet (0.76 m) to the overall distance for each bend, tee or angle in the pipe run.
NOTE: Tables based on Schedule 40 black pipe.
5.4.2— LP Vapor Pipe Sizing
The table indicates the maximum length (measured in feet / meters) allowed for various pipe sizes. The pipe sizes are
measured by inside diameter (ID) to include any fittings, valves (must be full flow), elbows, tees or angles. Add 2.5 feet
(0.76 m) to the overall distance for each bend, tee or angle in the pipe run.
NOTE: Pipe sizes are using a second stage regulator.
Allowable Pipe Distances (feet / meters)
Pipe Size
(in. / mm)
1 / 25 1.25 / 32 1.5 / 38
15 kW EcoGen
20 / 6 100 / 30 200 / 60
For 5-7 inches of water column (9-13 mm of mercury).
Allowable Pipe Distances (feet / meters)
Pipe Size
(in. / mm)
1 / 25 1.25 / 32 1.5 / 38
15 kW EcoGen
10 / 3 60 / 18 125 / 38
For pressures 3.5 - 5 inches of water column (7 - 9 mm of mercury).
Allowable Pipe Distances (feet / meters)
Pipe Size
(in. / mm)
0.75 / 19 1 / 25 1.25 / 32
15 kW EcoGen
250 / 76 70 / 21 350 / 106
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