Installation Guide

Fuel Conversion / Gas Connections
Installation Guidelines For Australian 50 Hz Air-Cooled Generators 19
Natural Gas Pipe Sizing
To determine correct gas pipe size, find the kVA rating of
the generator in the left column, and trace to the right.
The number to the right is the maximum length (mea-
sured 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 0.76 m (2.5 ft) per any bend, tee, or angle in
the pipe to the overall distance. Tables based on sched-
ule 40 black pipe. If installing any other piping system,
follow the pipe sizing charts for the selected piping sys-
tem.
LP Vapor Pipe Sizing
To determine correct LP vapor pipe size, find the kW rat-
ing 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 0.76 m (2.5 ft) 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 946 L (250 gal),
unless unit calculations dictate use of a larger tank. Verti-
cal tanks, which are measured in kilograms (or pounds),
are permitted if properly sized for the generator.
Table 5-1. Natural Gas Pipe Sizing
Pipe Size
(mm / in)
For 9–13 mm Hg
(5–7 in of water column)
For 7–9 mm Hg
(3.5–5 in. of water column)
Allowable Pipe Distances (meters / feet)
19 / 0.75 25 / 1 32 / 1.25 38 / 1.5 25 / 1 32 / 1.25 38 / 1.5
8 kVA 6.1 / 20 25.91 / 85 112.78 / 370 243.84 / 800 9.14 / 30 38.1 / 125 60.96 / 200
10 kVA 3.05 / 10 15.24 / 50 74.68 / 245 166.12 / 545 6.1 / 20 24.38 / 80 53.34 / 175
13 kVA — 12.19 / 40 57.91 / 190 129.54 / 425 3.05 / 10 18.29 / 60 38.1 / 125
Table 5-2. LP Vapor Pipe Sizing
Pipe Size (mm / in)
For 19–22 mm Hg (10–12 in of water column)
Allowable Pipe Distances (meters / feet)
19 / 0.75 25 / 1.0 32 / 1.25
8 kVA 21.33 / 70 77.72 / 255 304.8 / 1000
10 kVA 13.72 / 45 51.82 / 170 210.31 / 690
13 kVA 7.62 / 25 39.62 / 130 164.59 / 540