Download STANDBY GENERATOR SET

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The generator set Specification Sheet indicates the maximum fuel inlet and return restrictions, the maximum
fuel flow and the fuel consumption. Table 12 indicates minimum hose and pipe sizes for connections to a
supply tank or day tank that is relatively close to the set and at approximately the same elevation. Hose and pipe
size should be based on the maximum fuel flow rather than on the fuel consumption. (The maximum fuel flow
is approximately twice the full-load fuel consumption on GeneratorJoe generator sets rated 200/175
kW and larger.) It is highly recommended that the fuel Inlet and return restrictions be checked before the set is
placed in service.
TABLE 12. MINIMUM FUEL SUPPLY HOSE AND PIPE SIZES
FUEL SUPPLY LINE
FUEL RETURN LINE
0-10 FEET
(0-3 METRES)
PIPE I.D.
FLEX
INCHES
HOSE
(MM)
SIZE
10-50 FEET
(3-15 METRES)
FLEX
PIPE I.D.
HOSE
INCHES
SIZE
(MM)
0-10 FEET
(0-3 METRES)
FLEX
PIPE I.D.
HOSE
INCHES
SIZE
(MM)
10-50 FEET
(3-15 METRES)
FLEX
PIPE I.D.
HOSE
INCHES
SIZE
(MM)
0-15
NO. 6
5/16 (7.9)
NO. 6
13/32 (10.3)
NO. 4
3/16 (4.8)
NO. 6
5/16 (7.9)
15-20
NO. 8
13/32 (10.3)
NO. 8
1/2 (12.7)
NO. 4
3/16 (4.8)
NO. 6
5/16 (7.9)
20-80
NO. 10
1/2 (12.7)
NO. 10
5/8 (15.9)
NO. 8
13/32 (10.3)
NO. 10
1/2 (12.7)
80-100
NO. 12
5/8 (15.9)
NO. 16
7/8 (22.3)
NO. 8
13/32 (10.3)
NO. 10
1/2 (12.7)
100-160
NO. 16
7/8 (22.3)
NO. 16
7/8 (22.3)
NO. 10
1/2 (12.7)
NO. 12
5/8 (15.9)
160 >
NO. 16
7/8 (22.3)
NO. 16
7/8 (22.3)
NO. 12
5/8 (15.9)
NO. 12
5/8 (15.9)
MAXIMUM
GPH
Based on four straight fittings, two 90º fittings and minimal fuel lift height.
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Separate fuel return lines to the day tank or supply tank must be provided for each generator set in a multiple-set
installation to prevent the return lines of idle sets from being pressurized. Also, a fuel return line must not
include a shutoff device. Engine damage will occur if the engine is run when the line is shut off.
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A day tank is required whenever pipe friction and/or supply tank elevation, either below the fuel pump inlet or
above the fuel injectors, would cause an excessive fuel inlet or return restriction. Some generator set models are
available with an integral skid- mounted or sub-base day tank.
For critical start applications, where generator sets are paralleled or must satisfy emergency start-time
requirements, it is recommended that a fuel tank or reservoir be located such that the lowest possible fuel level
is not less than 6 inches (150mm) above the fuel pump inlet. This will prevent air from accumulating in the fuel
line while the set is in standby, eliminating the period during startup when it has to be purged.
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