Fuel Conversion / Gas Connections
Installation Guidelines For 60 Hz EcoGen™ Generators 19
Natural Gas Pipe Sizing
To determine correct gas pipe size, find the kW rating of
the generator in the left column, and trace to the right.
The number to the right is the maximum length
(measured in meters / feet) allowed for the pipe sizes on
top. Pipe sizes are measured by inside diameter (ID) to
include any fittings, valves (must be full flow), elbows,
tees, or angles.
NOTE: Add 2.5 ft (0.76 m) per any bend, tee, or angle in
the pipe to the overall distance. Tables based on
schedule 40 black pipe. If installing any other piping
system, follow the pipe sizing charts for the selected
piping system.
LP Vapor Pipe Sizing
To determine correct LP vapor pipe size, find the kW
rating of the generator in the left column, and trace to the
right. The number to the right is the maximum length
(measured in meters / feet) allowed for the pipe sizes on
top. 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 ft (0.76 m) per any bend, tee, or
angle in the pipe to the overall distance.
NOTE: Pipe sizes are using a second stage regulator.
NOTE: The minimum LP tank size is 250 gal (946 L),
unless unit calculations dictate use of a larger tank.
Vertical tanks, which are measured in pounds (or
kilograms), are permitted if properly sized for the
generator.
Table 5-1. Natural Gas Pipe Sizing
For 5–7 in of water column
(9–13 mmHg)
For 3.5–5 in of water column
(7–9 mmHg)
Allowable Pipe Distances (feet / meters)
Pipe Size
(in / mm)
0.75 / 19 1 / 25 1.25 / 32 1.5 / 38 2 / 51 1 / 25 1.25 / 32 1.5 / 38
15 kW — 20 / 6 100 / 30 200 / 60 — 10 / 3 60 / 30 125 / 38
Table 5-2. LP Vapor Pipe Sizing
For 10–12 in of water column (19–22 mmHg)
Allowable Pipe Distances (feet / meters)
Pipe Size (in / mm) 0.75 / 19 1 / 25 1.25 / 32
15 kW 20 / 6 70 / 21 350 / 106
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