Install Manual

4. Installation2-2016
35A045R241 (Issue 7) Copyright © 2016 Cummins Inc.
• Approximately 60% of the fuel (in gallons) filled in the tank can be
effectively used. Therefore, a 500-gallon (1892-liter) tank results in 240-
gallon (908-liter) usable capacity.
To assist in the proper installation of the propane tank, follow the guidelines
below.
• Consult your tank and propane supplier for assistance in all aspects of
determining tank size, selection of components and installation
requirements.
• Fit the propane tanks with a pressure reducing regulator before
connection to the generator set to prevent fuel system damage.
• Locate the propane tanks and all other fuel system components at least
10 feet (3 meters) from any source of combustion (including the generator
set). The fuel supplier or local code may require a larger distance
between the tank and source of combustion.
• Install the propane tanks according to all national and local codes and
standards, and as required by the fuel tank and fuel supplier.
Refer to the Fuel Line Selection appendix for propane figures and tables.
Sizing Fuel Lines
Incorrect fuel line size may cause the generator set to not run or provide full power
output. Fuel line sizes for installations typically range from 1/4 to 2 or more inches in
diameter.
To determine the optimal fuel line size, the following information is needed:
Category Description
Fuel Flow
Requirements for
the Generator Set
Fuel flow requirements have a large impact on fuel line size.
Fuel Source
(Natural Gas or
Propane Vapor)
Fuel sources can affect fuel line size. Natural gas installations generally
require a higher fuel flow rate compared to propane vapor installations,
since propane has a higher energy content.
Fuel Line Length
(Including Fittings)
Factor in the equivalent lengths of all of the fittings (elbows, tees, valves)
in the installation in addition to the fuel line length. Longer lengths
require larger diameters.
Fuel Line Type
(e.g., Copper
Tubing or Iron
Pipe)
Most fuel line types are iron pipe or copper tubing. Be sure to use the
sizing chart for the fuel line type when sizing the fuel line.
There are some basic but very important steps all installers must follow to make
sure that fuel lines are sized correctly:
1. Verify adequate fuel flow, quality, and pressure available from utility connection.